CN111043202A - Friction material, composite brake shoe and preparation method - Google Patents
Friction material, composite brake shoe and preparation method Download PDFInfo
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- CN111043202A CN111043202A CN201911424221.0A CN201911424221A CN111043202A CN 111043202 A CN111043202 A CN 111043202A CN 201911424221 A CN201911424221 A CN 201911424221A CN 111043202 A CN111043202 A CN 111043202A
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- friction material
- fiber
- composite brake
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- 239000002783 friction material Substances 0.000 title claims abstract description 31
- 239000002131 composite material Substances 0.000 title claims abstract description 22
- 238000002360 preparation method Methods 0.000 title abstract description 12
- 238000012423 maintenance Methods 0.000 claims abstract description 23
- 239000000835 fiber Substances 0.000 claims abstract description 22
- 229920002748 Basalt fiber Polymers 0.000 claims abstract description 21
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 21
- 239000003365 glass fiber Substances 0.000 claims abstract description 21
- 239000010959 steel Substances 0.000 claims abstract description 21
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910052796 boron Inorganic materials 0.000 claims abstract description 12
- -1 boron modified phenolic resin Chemical class 0.000 claims abstract description 12
- 229920001568 phenolic resin Polymers 0.000 claims abstract description 12
- 239000005011 phenolic resin Substances 0.000 claims abstract description 12
- 239000002994 raw material Substances 0.000 claims abstract description 12
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims abstract description 10
- 239000010428 baryte Substances 0.000 claims abstract description 10
- 229910052601 baryte Inorganic materials 0.000 claims abstract description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229920000459 Nitrile rubber Polymers 0.000 claims abstract description 8
- 229920006231 aramid fiber Polymers 0.000 claims abstract description 8
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims abstract description 8
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims abstract description 8
- 239000000920 calcium hydroxide Substances 0.000 claims abstract description 8
- 239000010439 graphite Substances 0.000 claims abstract description 8
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 8
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims abstract description 8
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract description 8
- 239000000203 mixture Substances 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 11
- 238000003825 pressing Methods 0.000 claims description 11
- 238000002156 mixing Methods 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 5
- 229910052751 metal Inorganic materials 0.000 abstract description 5
- 239000002184 metal Substances 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 230000007547 defect Effects 0.000 abstract description 3
- 238000005336 cracking Methods 0.000 abstract description 2
- 230000002195 synergetic effect Effects 0.000 abstract description 2
- 238000012546 transfer Methods 0.000 abstract description 2
- 239000000843 powder Substances 0.000 description 5
- 239000011159 matrix material Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000003137 locomotive effect Effects 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
- F16D69/02—Composition of linings ; Methods of manufacturing
- F16D69/027—Compositions based on metals or inorganic oxides
- F16D69/028—Compositions based on metals or inorganic oxides containing fibres
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/14—Anti-slip materials; Abrasives
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2200/00—Materials; Production methods therefor
- F16D2200/0004—Materials; Production methods therefor metallic
- F16D2200/0008—Ferro
- F16D2200/0021—Steel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2200/00—Materials; Production methods therefor
- F16D2200/0034—Materials; Production methods therefor non-metallic
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2200/00—Materials; Production methods therefor
- F16D2200/0034—Materials; Production methods therefor non-metallic
- F16D2200/0052—Carbon
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2200/00—Materials; Production methods therefor
- F16D2200/006—Materials; Production methods therefor containing fibres or particles
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2200/00—Materials; Production methods therefor
- F16D2200/006—Materials; Production methods therefor containing fibres or particles
- F16D2200/0069—Materials; Production methods therefor containing fibres or particles being characterised by their size
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2200/00—Materials; Production methods therefor
- F16D2200/0082—Production methods therefor
- F16D2200/0086—Moulding materials together by application of heat and pressure
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Braking Arrangements (AREA)
Abstract
The invention relates to a friction material, a composite brake shoe and a preparation method thereof, belonging to the technical field of brake shoe preparation. A friction material comprises the following raw materials in parts by weight: 25-30 parts of steel fiber, 5-8 parts of boron modified phenolic resin, 10-15 parts of phenolic resin, 3-5 parts of nitrile rubber, 10-15 parts of graphite, 5-10 parts of glass fiber, 5-10 parts of basalt fiber, 2-5 parts of barite, 1-2 parts of aramid fiber, 15-20 parts of calcium hydroxide, 1-2 parts of silicon carbide and 2-5 parts of aluminum oxide. According to the invention, through the proportion of the metal content in the formula and the synergistic effect of the raw materials, the hardness of the friction material is increased, the friction coefficient is reduced, the elastic modulus is increased, and the heat resistance is enhanced. The brake shoe prepared by the friction material has the characteristics of good heat resistance, low and stable friction coefficient and good impact resistance effect, can prevent the transfer, bonding, damage and scratch of a base material of the brake shoe during braking, and can overcome the defects of brake shoe block falling/cracking, metal inlays and the like generated when a large road maintenance machine brakes frequently.
Description
Technical Field
The invention relates to the technical field of brake shoe preparation, in particular to a friction material, a composite brake shoe and a preparation method.
Background
In recent years, the national ministry of railways continuously increases the input force of large-scale road maintenance machinery, so that the large-scale road maintenance machinery of the railways in China forms a certain equipment scale. And at the end of fifteen, the whole line is cumulatively provided with 34 line overhaul units, 71 line maintenance units and various large-scale road maintenance machines 589, and the capacity of maintaining 40400km of the line and 5440km of the line in an annual overhaul mode is achieved. The comprehensive operation range of the large road maintenance machine covers the whole busy trunk line and the speed-up line, and a new production pattern taking the large road maintenance machine as a main operation means is formed.
In 2017, the inventory of large railway road maintenance machines in China is about 3375, wherein about 2700 railway large road maintenance machines are manufactured and sold by the new high-rise equipment of iron building Limited in China in an accumulated mode, account for 80% of the total amount of the whole country, and are ranked the first nationwide. The stock of large-scale railway road maintenance machinery in China in 2018 is estimated to reach 3500 machines, and with the continuous increase of the stock of the large-scale railway road maintenance machinery, the market scale of the major repair industry also reaches 9 billion yuan. In the future, the holding capacity of large railway road maintenance machinery in China will or will continue to keep steadily increasing, and with the repair peak, the potential billion market scale of the overhaul industry.
During the braking process of the large road maintenance machine, the brake shoe is tightly pressed on the wheel tread, and the wheel stops rotating through friction between the brake shoe and the wheel tread. Under normal conditions, the magnitude of the braking force is proportional to the brake shoe pressure. However, the brake shoe pressure cannot be increased for large road maintenance machinery at once, because the brake shoe has a standard contact area, the contact area of the brake shoe and the wheel tread is limited to a certain extent, and when the brake shoe is too wide or too long, the stress distribution is uneven, and the brake shoe does not play a great role. In the prior art, the friction coefficient is increased by considering the material of the brake shoe, and the high friction composite brake shoe is adopted to meet the application requirement of large road maintenance machinery.
However, the large road maintenance machinery vehicle has heavy axle and relatively low running speed, and the brake shoe is frequently braked during road maintenance, so that high energy is inevitably generated by a large friction coefficient, and the defects of brake shoe block falling/cracking and the like are caused. The high friction composite brake shoe also has metal inlay during braking, which causes damage to the wheel tread. In addition, high friction composite brake shoes have poor thermal conductivity and are sensitive to rail wetting.
Disclosure of Invention
Accordingly, it is an object of the present invention to provide a friction material, a composite brake shoe and a method of making. The specific technical scheme is as follows:
a friction material comprises the following raw materials in parts by weight:
25-30 parts of steel fiber, 5-8 parts of boron modified phenolic resin, 10-15 parts of phenolic resin, 3-5 parts of nitrile rubber, 10-15 parts of graphite, 5-10 parts of glass fiber, 5-10 parts of basalt fiber, 2-5 parts of barite, 1-2 parts of aramid fiber, 15-20 parts of calcium hydroxide, 1-2 parts of silicon carbide and 2-5 parts of aluminum oxide.
The length-diameter ratio of the steel fiber is (30-100): 1;
the length-diameter ratio of the glass fiber is (200-) -400): 1;
the length-diameter ratio of the basalt fiber is (200-): 1;
the diameters of the steel fibers, the glass fibers and the basalt fibers are 0.03-0.06 mm;
the barite BaSO4The content of (A) is more than or equal to 98 wt%.
Preferably, the aspect ratio of the steel fibers is (40-80): 1;
the length-diameter ratio of the glass fiber is (250-) -350): 1;
the length-diameter ratio of the basalt fiber is (250-350): 1.
preferably, the aspect ratio of the steel fibers is 60: 1;
the length-diameter ratio of the glass fiber is 300: 1;
the length-diameter ratio of the basalt fibers is 300: 1.
a composite brake shoe is prepared from the friction material.
The composite brake shoe is used for large road maintenance machinery, wherein the large road maintenance machinery is large equipment applied to railway line inspection, maintenance and repair, such as: full-face ballast cleaning and screening machine, tamping car, rail grinding train, overhaul train, etc. Meanwhile, the device is also suitable for direct current transmission locomotives.
The composite brake shoe is an LL type brake shoe.
The preparation method of the composite brake shoe comprises the following steps:
mixing the raw materials according to the formula ratio to obtain a mixture;
pressing the mixture to obtain a blank;
and heating and curing the blank to obtain the composite brake shoe.
The pressure of the pressing is 2-10Mpa, the temperature is 110-;
the temperature for heating and curing is 150 ℃ and 250 ℃, and the time is 30-40 h.
Preferably, the pressure of the pressing is 4-7MPa, the temperature is 115-125 ℃, and the time is 150-210 s;
the temperature of the heating and curing is 180-240 ℃, and the time is 33-40 h.
The technical scheme of the invention has the following advantages:
1. the friction material provided by the invention has the advantages that the hardness of the friction material is increased, the friction coefficient is reduced, the elastic modulus is increased, and the heat resistance is enhanced through the synergistic effect of the metal content ratio and the raw materials in the formula. The brake shoe prepared by the friction material has the characteristics of good heat resistance, low and stable friction coefficient and good impact resistance effect, can prevent the transfer, bonding, damage and scratch of a matrix material when the brake shoe is braked, can overcome the defects of brake shoe block falling/crack, metal inlay and the like generated when large road maintenance machinery brakes frequently, further can protect the dual material, reduce the abrasion of a wheel tread and the generation of wheel tread fatigue crack, prolong the service life of the wheel tread and ensure the braking distance of a road maintenance machinery wheel under frequent braking.
2. The friction material provided by the invention takes a resin base as a material matrix, adopts the boron modified phenolic resin and the phenolic resin for blending, increases the proportion of the resin in the material, and limits 5-8 parts of the boron modified phenolic resin and 10-15 parts of the phenolic resin, and because the phenolic resin has good acid resistance, mechanical property and heat resistance, the boron modified phenolic resin has better heat resistance, instantaneous high temperature resistance and mechanical property than the phenolic resin, the high temperature resistance effect of the friction material can be improved, the product hardness is reduced, the friction coefficient is reduced, and the brittleness caused by the boron modified phenolic resin achieves the impact resistance effect through the matrix of the fiber reinforced friction material.
Detailed Description
The following examples are provided to better understand the present invention, not to limit the best mode, and not to limit the content and the protection scope of the present invention, and any product similar or similar to the present invention, which is obtained by combining the present invention with other prior art features or the teaching of the present invention, falls within the protection scope of the present invention.
The examples do not show the specific experimental steps or conditions, and the operation or conditions of the conventional experimental steps described in the literature in the field can be performed. The reagents or instruments used are not indicated by manufacturers, and are all conventional reagent products which can be obtained commercially.
Example 1
The friction material provided by the embodiment is composed of the following raw materials: 25g of steel fiber, 5g of boron modified phenolic resin, 10g of phenolic resin, 3g of nitrile rubber powder, 10g of graphite, 5g of glass fiber, 5g of basalt fiber, 2g of barite, 1g of aramid fiber, 15g of calcium hydroxide, 1g of silicon carbide and 2g of aluminum oxide.
Wherein the aspect ratio of the steel fibers is 60: 1, its diameter is 0.04 mm; the length-diameter ratio of the glass fiber is 300: 1, its diameter is 0.04 mm; the length-diameter ratio of the basalt fibers is 300: 1, its diameter is 0.04 mm.
The synthetic brake shoe is prepared from the friction material, and the preparation method comprises the following steps:
uniformly mixing the components according to the proportion to obtain a mixture;
placing the mixture in a mold, and pressing at 5Mpa and 120 deg.C for 180s to obtain blank;
heating and curing the pressed blank at 210 ℃ for 36h to obtain the brake shoe.
Example 2
The friction material provided by the embodiment is composed of the following raw materials: 30g of steel fiber, 8g of boron modified phenolic resin, 15g of phenolic resin, 5g of nitrile rubber powder, 15g of graphite, 10g of glass fiber, 10g of basalt fiber, 5g of barite, 2g of aramid fiber, 20g of calcium hydroxide, 2g of silicon carbide and 5g of aluminum oxide.
Wherein the aspect ratio of the steel fibers is 30: 1, the diameter of which is 0.03 mm; the length-diameter ratio of the glass fiber is 200: 1, its diameter is 0.05 mm; the length-diameter ratio of the basalt fibers is 200: 1, its diameter is 0.04 mm.
The synthetic brake shoe is prepared from the friction material, and the preparation method comprises the following steps:
uniformly mixing the components according to the proportion to obtain a mixture;
placing the mixture in a mold, and pressing at 2Mpa and 120 deg.C for 250s to obtain blank;
heating and curing the pressed blank at 150 ℃ for 40h to obtain the brake shoe.
Example 3
The friction material provided by the embodiment is composed of the following raw materials: 27g of steel fiber, 7g of boron modified phenolic resin, 12g of phenolic resin, 4g of nitrile rubber powder, 13g of graphite, 7g of glass fiber, 7g of basalt fiber, 3g of barite, 1.5g of aramid fiber, 18g of calcium hydroxide, 1.5g of silicon carbide and 3g of aluminum oxide.
Wherein the length-diameter ratio of the steel fiber is 100: 1, its diameter is 0.04 mm; the length-diameter ratio of the glass fiber is 400: 1, the diameter of which is 0.03 mm; the length-diameter ratio of the basalt fibers is 400: 1, its diameter is 0.04 mm.
The synthetic brake shoe is prepared from the friction material, and the preparation method comprises the following steps:
uniformly mixing the components according to the proportion to obtain a mixture;
placing the mixture in a mold, and pressing at 10Mpa and 120 deg.C for 100s to obtain blank;
heating and curing the pressed blank at 250 ℃ for 30h to obtain the brake shoe.
Example 4
The friction material provided by the embodiment is composed of the following raw materials: 26g of steel fiber, 6g of boron modified phenolic resin, 14g of phenolic resin, 3.5g of nitrile rubber powder, 11g of graphite, 6g of glass fiber, 6g of basalt fiber, 4g of barite, 1g of aramid fiber, 17g of calcium hydroxide, 1g of silicon carbide and 4g of aluminum oxide.
Wherein the aspect ratio of the steel fibers is 40: 1, its diameter is 0.05 mm; the length-diameter ratio of the glass fiber is 350: 1, its diameter is 0.04 mm; the length-diameter ratio of the basalt fibers is 250: 1, its diameter is 0.06 mm.
The synthetic brake shoe is prepared from the friction material, and the preparation method comprises the following steps:
uniformly mixing the components according to the proportion to obtain a mixture;
placing the mixture in a mold, and pressing at 4Mpa and 120 deg.C for 210s to obtain blank;
heating and curing the pressed blank at 180 ℃ for 39h to obtain the brake shoe.
Example 5
The friction material provided by the embodiment is composed of the following raw materials: 29g of steel fiber, 7g of boron modified phenolic resin, 13g of phenolic resin, 4.5g of nitrile rubber powder, 14g of graphite, 8g of glass fiber, 9g of basalt fiber, 3.5g of barite, 2g of aramid fiber, 19g of calcium hydroxide, 2g of silicon carbide and 3g of aluminum oxide.
Wherein the length-diameter ratio of the steel fiber is 80: 1, its diameter is 0.04 mm; the aspect ratio of the glass fiber is 250: 1, its diameter is 0.05 mm; the length-diameter ratio of the basalt fibers is 350: 1, its diameter is 0.03 mm.
The synthetic brake shoe is prepared from the friction material, and the preparation method comprises the following steps:
uniformly mixing the components according to the proportion to obtain a mixture;
placing the mixture in a mold, and pressing at 7Mpa and 120 deg.C for 150s to obtain blank;
heating and curing the pressed blank at 240 ℃ for 33h to obtain the brake shoe.
Experimental example 1
The composite brake shoes prepared in the above examples 1 to 5 were subjected to performance tests, wherein the density was referred to GB/T1033.1, the Rockwell hardness was referred to GB/T3398.2, the impact strength was referred to GB/T1043.1, and the compression modulus and the compression strength were referred to GB/T1041. The test data are shown in Table 1, and each performance reference standard is the L grade of physical and mechanical performance of the brake shoe friction body in TB/T3196-2015.
TABLE 1
Experimental example 2
The friction coefficient test was performed on the synthetic brake shoes obtained in examples 1 to 5 described above in accordance with TB/T3196-2015. The results are shown in Table 2.
TABLE 2
Experimental example 3
The synthetic brake shoes obtained in examples 1 to 5 above were subjected to a friction performance test in accordance with TB/T3196-2015. The results are shown in Table 3.
TABLE 3
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.
Claims (10)
1. A friction material comprises the following raw materials in parts by weight:
25-30 parts of steel fiber, 5-8 parts of boron modified phenolic resin, 10-15 parts of phenolic resin, 3-5 parts of nitrile rubber, 10-15 parts of graphite, 5-10 parts of glass fiber, 5-10 parts of basalt fiber, 2-5 parts of barite, 1-2 parts of aramid fiber, 15-20 parts of calcium hydroxide, 1-2 parts of silicon carbide and 2-5 parts of aluminum oxide.
2. The friction material of claim 1, wherein the steel fibers have an aspect ratio of (30-100): 1;
the length-diameter ratio of the glass fiber is (200-) -400): 1;
the length-diameter ratio of the basalt fiber is (200-): 1;
the diameters of the steel fibers, the glass fibers and the basalt fibers are 0.03-0.06 mm;
BaSO in the barite4The content of (A) is more than or equal to 98 wt%.
3. The friction material of claim 1, wherein the steel fibers have an aspect ratio of (40-80): 1;
the length-diameter ratio of the glass fiber is (250-) -350): 1;
the length-diameter ratio of the basalt fiber is (250-350): 1.
4. the friction material of claim 1, wherein the steel fibers have an aspect ratio of 60: 1;
the length-diameter ratio of the glass fiber is 300: 1;
the length-diameter ratio of the basalt fibers is 300: 1.
5. a composite brake shoe made from the friction material of any one of claims 1-4.
6. The composite brake shoe of claim 5 wherein said composite brake shoe is a composite brake shoe for large track maintenance machinery.
7. The composite brake shoe of claim 5 or 6 wherein said composite brake shoe is an LL type brake shoe.
8. The method of making a composite brake shoe according to any one of claims 5 to 7, comprising the steps of:
mixing the raw materials according to the formula ratio to obtain a mixture;
pressing the mixture to obtain a blank;
and heating and curing the blank to obtain the composite brake shoe.
9. The method as claimed in claim 8, wherein the pressure of the pressing is 2-10Mpa, the temperature is 110-130 ℃, and the time is 100-250 s;
the temperature for heating and curing is 150 ℃ and 250 ℃, and the time is 30-40 h.
10. The method as claimed in claim 8, wherein the pressure of the pressing is 4-7Mpa, the temperature is 115-125 ℃, and the time is 150-210 s;
the temperature of the heating and curing is 180-240 ℃, and the time is 33-40 h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911424221.0A CN111043202A (en) | 2019-12-31 | 2019-12-31 | Friction material, composite brake shoe and preparation method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911424221.0A CN111043202A (en) | 2019-12-31 | 2019-12-31 | Friction material, composite brake shoe and preparation method |
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| Publication Number | Publication Date |
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| CN111043202A true CN111043202A (en) | 2020-04-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911424221.0A Pending CN111043202A (en) | 2019-12-31 | 2019-12-31 | Friction material, composite brake shoe and preparation method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021236798A1 (en) * | 2020-05-22 | 2021-11-25 | Itt Italia S.R.L. | Under-layer for a brake pad of a brake disc rotor |
| CN115011066A (en) * | 2022-07-01 | 2022-09-06 | 天宜上佳（天津）新材料有限公司 | Friction composition, friction body prepared from friction composition and composite brake shoe prepared from friction body |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106051004A (en) * | 2016-06-29 | 2016-10-26 | 芜湖德业摩擦材料有限公司 | Dedicated friction material for car brake pad |
| CN106641033A (en) * | 2016-12-23 | 2017-05-10 | 北京天宜上佳新材料股份有限公司 | Friction material, haulage motor brake shoe containing same and preparation method |
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| CN108571545A (en) * | 2018-07-05 | 2018-09-25 | 天宜上佳（天津）新材料有限公司 | A kind of friction material, the brake block being made from it and the method for manufacturing the brake block |
| US20190003545A1 (en) * | 2017-06-29 | 2019-01-03 | Robert Bosch Llc | Composite coating for noise and vibration damping and brake pad having such a coating |
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| CN115011066A (en) * | 2022-07-01 | 2022-09-06 | 天宜上佳（天津）新材料有限公司 | Friction composition, friction body prepared from friction composition and composite brake shoe prepared from friction body |
| CN115011066B (en) * | 2022-07-01 | 2023-08-15 | 天宜上佳（天津）新材料有限公司 | Friction composition, friction body prepared from friction composition and composite brake shoe prepared from friction body |
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Application publication date: 20200421 |