CN102943185A - Preparation method of aluminum oxide dispersion-strengthened copper - Google Patents
Preparation method of aluminum oxide dispersion-strengthened copper Download PDFInfo
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims abstract description 65
- 239000010949 copper Substances 0.000 title claims abstract description 46
- 229910052802 copper Inorganic materials 0.000 title claims abstract description 45
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 title claims abstract description 14
- 229910001175 oxide dispersion-strengthened alloy Inorganic materials 0.000 title claims abstract description 12
- 238000002360 preparation method Methods 0.000 title claims description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 36
- 238000000034 method Methods 0.000 claims abstract description 31
- 238000000498 ball milling Methods 0.000 claims abstract description 28
- 239000000843 powder Substances 0.000 claims abstract description 22
- 239000002245 particle Substances 0.000 claims abstract description 18
- 239000011230 binding agent Substances 0.000 claims abstract description 15
- 238000005245 sintering Methods 0.000 claims abstract description 13
- 238000005238 degreasing Methods 0.000 claims abstract description 9
- 238000001746 injection moulding Methods 0.000 claims abstract description 4
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 claims description 15
- 238000002347 injection Methods 0.000 claims description 13
- 239000007924 injection Substances 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 11
- 235000021355 Stearic acid Nutrition 0.000 claims description 10
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 10
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 10
- 239000008117 stearic acid Substances 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 9
- 239000000523 sample Substances 0.000 claims description 9
- 239000012496 blank sample Substances 0.000 claims description 7
- 239000002904 solvent Substances 0.000 claims description 7
- 229920001169 thermoplastic Polymers 0.000 claims description 7
- 239000004416 thermosoftening plastic Substances 0.000 claims description 7
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 238000004886 process control Methods 0.000 claims description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 5
- 239000006185 dispersion Substances 0.000 claims description 5
- 229920001903 high density polyethylene Polymers 0.000 claims description 5
- 239000004700 high-density polyethylene Substances 0.000 claims description 5
- 239000001257 hydrogen Substances 0.000 claims description 5
- 229910052739 hydrogen Inorganic materials 0.000 claims description 5
- 229920001684 low density polyethylene Polymers 0.000 claims description 5
- 239000004702 low-density polyethylene Substances 0.000 claims description 5
- 239000012188 paraffin wax Substances 0.000 claims description 5
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 2
- 238000002844 melting Methods 0.000 claims description 2
- 230000008018 melting Effects 0.000 claims description 2
- 239000003960 organic solvent Substances 0.000 claims description 2
- 239000002994 raw material Substances 0.000 abstract description 9
- 230000003647 oxidation Effects 0.000 abstract description 7
- 238000007254 oxidation reaction Methods 0.000 abstract description 7
- 238000009776 industrial production Methods 0.000 abstract description 3
- 238000004663 powder metallurgy Methods 0.000 abstract description 2
- 239000002131 composite material Substances 0.000 abstract 1
- 150000001875 compounds Chemical class 0.000 abstract 1
- 238000005551 mechanical alloying Methods 0.000 abstract 1
- 238000007670 refining Methods 0.000 abstract 1
- 238000000635 electron micrograph Methods 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000000227 grinding Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000003801 milling Methods 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- 229910000881 Cu alloy Inorganic materials 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000001000 micrograph Methods 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- JRBRVDCKNXZZGH-UHFFFAOYSA-N alumane;copper Chemical compound [AlH3].[Cu] JRBRVDCKNXZZGH-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000001192 hot extrusion Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
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Abstract
本发明属于粉末冶金技术领域，提供了一种氧化铝弥散强化铜的制备方法，该方法是首先采用机械合金化法，将铜粉与氧化铝粉球磨复合，然后将复合粉末与粘结剂混炼、制粒，在注塑机上注射成型之后，经过脱脂烧结，制备出弥散铜产品。以此种方法制备的弥散铜产品性能与目前工业化采用内氧化法制备的弥散铜产品性能相当；铜粉末和氧化铝粉末的粒度可以通过使用的原材料和球磨工艺来控制，无须价格较高的纳米氧化铝颗粒或超细氧化铝颗粒；产品成本大幅度降低，工艺方法简单、易于工业化生产。The invention belongs to the technical field of powder metallurgy, and provides a method for preparing aluminum oxide dispersion-strengthened copper. The method is firstly adopting a mechanical alloying method to compound copper powder and aluminum oxide powder by ball milling, and then mixing the composite powder with a binder. Refining and granulating, after injection molding on the injection molding machine, the dispersed copper product is prepared through degreasing and sintering. The performance of the dispersed copper product prepared by this method is equivalent to that of the dispersed copper product prepared by the current industrial internal oxidation method; the particle size of copper powder and alumina powder can be controlled by the raw materials used and the ball milling process, without the need for expensive nanometer Alumina particles or ultra-fine alumina particles; the cost of the product is greatly reduced, the process method is simple, and it is easy for industrial production.
Description
技术领域 technical field
本发明属于粉末冶金技术领域，提供了一种高强度、高导电率的氧化铝弥散强化铜的制备方法，可以应用在制造喷涂喷嘴、气焊焊嘴、导电嘴、点焊电极等要求在高温下具有高强度和高导电导热性能的铜基产品上。 The invention belongs to the technical field of powder metallurgy, and provides a method for preparing aluminum oxide dispersion-strengthened copper with high strength and high conductivity, which can be applied in the manufacture of spray nozzles, gas welding tips, conductive tips, spot welding electrodes, etc. On copper-based products with high strength and high electrical and thermal conductivity.
背景技术 Background technique
铜和铜合金具有优异的导电、导热性能，常用通过固溶强化、加工硬化、时效析出强化等强化原理来提高力学性能，但是这些手段在高温下不会再有效作用，常用的铜及其合金材料很难满足高温强度和热稳定性方面的使用要求。 Copper and copper alloys have excellent electrical and thermal conductivity, and are often used to improve mechanical properties through strengthening principles such as solid solution strengthening, work hardening, and aging precipitation strengthening, but these methods will no longer work effectively at high temperatures. Commonly used copper and its alloys It is difficult for the material to meet the use requirements in terms of high temperature strength and thermal stability.
为了克服常规铜及其合金在高温下强度不足和热稳定性差的缺陷，可在铜基体中引入弥散分布的、高温性能稳定的细小亚微米氧化铝颗粒。导电理论指出，第二相在铜基体中引起的点阵畸变对电子的散射作用较固溶原子引起的散射作用要低得多，所以弥散强化铜在保持它的高导电性的同时，弥散分布的颗粒阻碍位错运动、阻止晶粒长大，可以提高其高温强度。 In order to overcome the defects of insufficient strength and poor thermal stability of conventional copper and its alloys at high temperatures, fine submicron alumina particles dispersedly distributed and stable at high temperatures can be introduced into the copper matrix. The conductivity theory points out that the scattering effect of the lattice distortion caused by the second phase in the copper matrix is much lower than that caused by the solid-solution atoms, so the dispersion-strengthened copper maintains its high conductivity and is diffusely distributed. The particles hinder dislocation movement and prevent grain growth, which can improve its high temperature strength.
目前制备氧化铝弥散强化铜的主要方法有内氧化法，比如美国SCM公司上世纪70年代开发出的Glidcop系列氧化铝弥散强化铜；还有内氧化与烧结同步进行的简化内氧化法（CN101293317A），经过真空烧结内氧化+热挤压法制备氧化铝弥散强化铜(CN1936042A)，以及通过不需要专门氧化物介质的低温导氧技术生产出氧化铝相原位生长的弥散强化铜粉末(CN1915562A)。 At present, the main method for preparing alumina dispersion-strengthened copper is internal oxidation method, such as the Glidcop series of alumina dispersion-strengthened copper developed by the American SCM company in the 1970s; there is also a simplified internal oxidation method (CN101293317A) where internal oxidation and sintering are carried out simultaneously. , through vacuum sintering internal oxidation + hot extrusion method to prepare alumina dispersion strengthened copper (CN1936042A), and to produce dispersion strengthened copper powder with in-situ growth of alumina phase (CN1915562A) through low temperature oxygen conduction technology that does not require a special oxide medium.
以上技术都是先制得铜铝合金粉末，然后将合金中的铝选择性氧化成为氧化铝颗粒。这些技术在氧化铝弥散增强颗粒的数量控制方面技术要求很高；此外，不仅生产时间长，成本高，而且在产品制造时加工量大，材料利用率不理想。 The above technologies are to prepare copper-aluminum alloy powder first, and then selectively oxidize the aluminum in the alloy to form alumina particles. These technologies require high technical requirements in terms of quantity control of alumina dispersion-reinforced particles; in addition, not only the production time is long, the cost is high, but also the processing volume is large during product manufacturing, and the material utilization rate is not ideal.
发明内容 Contents of the invention
针对现有技术的不足，本发明旨在提供一种制备氧化铝弥散强化铜的新方法，以此种方法制备的弥散铜产品性能与目前工业化采用内氧化法制备的弥散铜产品性能相当，铜粉末和氧化铝粉末的粒度可以通过使用的原材料和球磨工艺来控制，无须价格较高的纳米氧化铝颗粒或超细氧化铝颗粒，成本大幅度降低，工艺方法简单、易于工业化生产。 Aiming at the deficiencies of the prior art, the present invention aims to provide a new method for preparing alumina dispersion-strengthened copper. The performance of the dispersed copper product prepared by this method is equivalent to that of the dispersed copper product prepared by the current industrialized internal oxidation method. The particle size of the powder and alumina powder can be controlled by the raw materials used and the ball milling process, without the need for expensive nano-alumina particles or ultra-fine alumina particles, the cost is greatly reduced, the process method is simple, and it is easy for industrial production.
为实现上述目的，本发明的技术方案是： For realizing the above object, technical scheme of the present invention is:
一种氧化铝弥散强化铜的制备方法，具体步骤为： A method for preparing aluminum oxide dispersion strengthened copper, the specific steps are:
1）将100目-400目的氧化铝粉加入到100目-400目的电解铜粉中，得混合物，其中氧化铝粉占混合物总质量的0.3%~6%；再加入占混合物总质量1%-10%的过程控制剂，进行行星球磨，控制球磨转速为100 r/min ~400r/min，球磨时间为1~40小时，球料比为5~20︰1，使得Al2O3粒子弥散均匀分布于铜粉中，得弥散铜粉末； 1) Add 100 mesh-400 mesh alumina powder to 100 mesh-400 mesh electrolytic copper powder to obtain a mixture, in which alumina powder accounts for 0.3%~6% of the total mass of the mixture; then add 1%- 10% process control agent, carry out planetary ball milling, control ball milling speed to 100 r/min ~400r/min, ball milling time is 1~40 hours, ball material ratio is 5~20︰1, so that Al 2 O 3 particles are evenly dispersed Distributed in copper powder to obtain dispersed copper powder;
2）用热塑性粘结剂将所述弥散铜粉末注射成形，控制注射温度120℃~180℃，注射压力50 MPa ~150MPa，得坯样；其中所述热塑性粘结剂由60份~70份的石蜡，10份~15份的低密度聚乙烯，10份~15份的高密度聚乙烯，5份~10份的硬脂酸组成； 2) Injection molding the dispersed copper powder with a thermoplastic binder, controlling the injection temperature at 120°C to 180°C, and the injection pressure at 50 MPa to 150MPa to obtain a blank sample; wherein the thermoplastic binder consists of 60 to 70 parts of Paraffin wax, 10-15 parts of low-density polyethylene, 10-15 parts of high-density polyethylene, 5-10 parts of stearic acid;
3）所述坯样先经15℃~45℃的溶剂脱脂3~8小时脱除粘结剂中低熔点组分后，再经550℃-650℃的热脱脂脱除所有粘结剂组分，得脱脂坯样； 3) The blank sample is degreased by solvent at 15°C~45°C for 3~8 hours to remove the low melting point components in the binder, and then removes all the binder components by thermal degreasing at 550°C-650°C , to obtain a skim base sample;
4）采用氢气保护和真空烧结的方式对脱脂坯样进行烧结处理，烧结温度在850℃~1000℃，烧结时间1~6小时，随炉冷却，得氧化铝弥散强化铜产品。 4) Use hydrogen protection and vacuum sintering to sinter the degreased base sample. The sintering temperature is 850°C~1000°C, the sintering time is 1~6 hours, and the alumina dispersion strengthened copper product is obtained by cooling with the furnace.
步骤1）中所述氧化铝粉优选占混合物总质量的3.5%~6%。 The alumina powder described in step 1) preferably accounts for 3.5%~6% of the total mass of the mixture.
步骤1）中所述过程控制剂的加入量优选占混合物总质量5%-6%，所述过程控制剂优选为硬脂酸。 The added amount of the process control agent in step 1) preferably accounts for 5%-6% of the total mass of the mixture, and the process control agent is preferably stearic acid.
步骤1）中所述球磨转速优选为150 r/min ~270r/min，球磨时间优选为10~20小时，球料比优选为5~10︰1。 The ball milling speed in step 1) is preferably 150 r/min~270 r/min, the ball milling time is preferably 10~20 hours, and the ball-to-material ratio is preferably 5~10:1.
步骤1）中所述氧化铝粉优选为300目，电解铜粉优选为200目。 The aluminum oxide powder described in step 1) is preferably 300 mesh, and the electrolytic copper powder is preferably 200 mesh.
步骤1）中所述球磨所用的球磨罐和磨球均为紫铜制造，球磨气氛为空气。 The ball milling tank and balls used in the ball milling in step 1) are both made of red copper, and the ball milling atmosphere is air.
步骤3）中所述溶剂优选自正庚烷或者三氯甲烷等有机溶剂。 The solvent described in step 3) is preferably selected from organic solvents such as n-heptane or chloroform.
本发明将氧化铝粉与电解铜粉混合，通过控制球磨参数来使得Al2O3粒子弥散均匀分布于铜粉颗粒中，分布均匀，粒度小，且形状合适，具体见实施例中的电镜图，从而使得最终获得的氧化铝弥散强化铜产品强度大，导电性好。此制备方法简单、成本低。 In the present invention, alumina powder is mixed with electrolytic copper powder, and the Al 2 O 3 particles are dispersed and evenly distributed in the copper powder particles by controlling the ball milling parameters. The distribution is uniform, the particle size is small, and the shape is suitable. See the electron microscope diagram in the embodiment for details. , so that the finally obtained aluminum oxide dispersion strengthened copper product has high strength and good conductivity. The preparation method is simple and low in cost.
与现有技术相比，本发明的优势是： Compared with prior art, the advantage of the present invention is:
以此种方法制备的弥散铜产品性能与目前工业化采用内氧化法制备的弥散铜产品性能相当，铜粉末和氧化铝粉末的粒度可以通过使用的原材料和球磨工艺来控制，无须价格较高的纳米氧化铝颗粒或超细氧化铝颗粒，成本大幅度降低，工艺方法简单、易于工业化生产。 The performance of the dispersed copper product prepared by this method is equivalent to that of the dispersed copper product prepared by the current industrial internal oxidation method. The particle size of copper powder and alumina powder can be controlled by the raw materials used and the ball milling process, without the need for expensive nanometer Alumina particles or ultra-fine alumina particles, the cost is greatly reduced, the process method is simple, and the industrial production is easy.
附图说明 Description of drawings
图1 是实施例1中氧化铝弥散强化铜产品的电镜图，2.5% Al2O3，抛光试样扫描电镜背散射电镜图；
Fig. 1 is the electron micrograph of the aluminum oxide dispersion strengthened copper product in
图2是实施例2中氧化铝弥散强化铜产品的电镜图，1.2% Al2O3，腐蚀试样扫描电镜二次电子像 Fig. 2 is the electron microscope image of the aluminum oxide dispersion strengthened copper product in Example 2, 1.2% Al 2 O 3 , the secondary electron image of the scanning electron microscope of the corrosion sample
图3是实施例3中氧化铝弥散强化铜产品的电镜图，0.7%Al2O3，断口扫描电镜二次电子像。 Fig. 3 is an electron microscope image of the aluminum oxide dispersion strengthened copper product in Example 3, 0.7% Al 2 O 3 , and a secondary electron image of a fracture scanning electron microscope.
具体实施方式 Detailed ways
下面结合附图和实施例对本发明做进一步的说明。实施例中所述百分含量均为质量百分含量。 The present invention will be further described below in conjunction with the accompanying drawings and embodiments. The percentages stated in the examples are all mass percentages.
实施例1Example 1
原料粉末成分配比为97.5%的-300目的电解铜粉、2.5%的-250目的氧化铝粉混合；再加入占上述原料质量6%的硬脂酸，装入由紫铜制造的磨罐中，磨球也为紫铜，球磨气氛选择为空气，球料比选5：1，球磨速度为270r/min，球磨20小时。采用60~70%石蜡，10~15%低密度聚乙烯，10~15%高密度聚乙烯，5~10%硬脂酸组成的热塑性体系粘结剂。采用注射温度140℃，注射压力65MPa，注射成形坯样。坯样经过5小时的正庚烷溶剂脱脂和600℃的热脱脂脱除全部粘结剂后，采用氢气保护和真空烧结的方式对脱脂坯样进行烧结处理，在960℃烧结3小时，制备出硬度为HRB83，导电率为64%IACS的氧化铝弥散强化铜产品，产品电镜图见图1。 The raw material powder composition ratio is 97.5% -300 mesh electrolytic copper powder, 2.5% -250 mesh alumina powder; then add stearic acid accounting for 6% of the above raw material quality, and put it into a grinding tank made of red copper, The balls are also made of red copper, the atmosphere of ball milling is air, the ratio of ball to material is 5:1, the speed of ball milling is 270r/min, and the milling time is 20 hours. Use 60~70% paraffin, 10~15% low density polyethylene, 10~15% high density polyethylene, 5~10% stearic acid thermoplastic system binder. Using an injection temperature of 140°C and an injection pressure of 65MPa, the blank sample is injection molded. After 5 hours of n-heptane solvent degreasing and thermal degreasing at 600°C to remove all the binders, the degreased green sample was sintered by hydrogen protection and vacuum sintering, and sintered at 960°C for 3 hours to prepare The hardness is HRB83, the conductivity is 64% IACS aluminum oxide dispersion strengthened copper product, the electron micrograph of the product is shown in Figure 1.
实施例2Example 2
原料粉末成分配比为98.8%的-300目的电解铜粉、1.2%的-250目的氧化铝粉混合；再加入占上述原料质量5%的硬脂酸，装入由紫铜制造的磨罐中，磨球也为紫铜，球磨气氛选择为空气，球料比选7：1，球磨速度为230r/min，球磨17小时。采用60~70%石蜡，10~15%低密度聚乙烯，10~15%高密度聚乙烯，5~10%硬脂酸组成的热塑性体系粘结剂。采用注射温度140℃，注射压力65MPa，注射成形坯样。坯样经过5小时的正庚烷溶剂脱脂和600℃的热脱脂脱除全部粘结剂后，采用氢气保护和真空烧结的方式对脱脂坯样进行烧结处理，在940℃烧结3小时，制备出HRB79，70%IACS的氧化铝弥散强化铜产品，产品电镜图见图2。 The raw material powder composition ratio is 98.8% -300 mesh electrolytic copper powder, 1.2% -250 mesh alumina powder; then add stearic acid accounting for 5% of the above raw material quality, and put it into a grinding tank made of red copper, The balls are also made of red copper, the atmosphere of ball milling is air, the ratio of ball to material is 7:1, the speed of ball milling is 230r/min, and the milling time is 17 hours. Use 60~70% paraffin, 10~15% low density polyethylene, 10~15% high density polyethylene, 5~10% stearic acid thermoplastic system binder. Using an injection temperature of 140°C and an injection pressure of 65MPa, the blank sample is injection molded. After 5 hours of n-heptane solvent degreasing and thermal degreasing at 600°C to remove all the binders, the degreased green sample was sintered by hydrogen protection and vacuum sintering, and sintered at 940°C for 3 hours to prepare HRB79, 70% IACS aluminum oxide dispersion strengthened copper product, the electron micrograph of the product is shown in Figure 2.
实施例3Example 3
原料粉末成分配比为99.3%的-300目的电解铜粉、0.7%的-250目的氧化铝粉混合；再加入占上述原料质量5%的硬脂酸，装入由紫铜制造的磨罐中，磨球也为紫铜，球磨气氛选择为空气，球料比选10：1，球磨速度为180r/min，球磨14小时。采用60~70%石蜡，10~15%低密度聚乙烯，10~15%高密度聚乙烯，5~10%硬脂酸组成的热塑性体系粘结剂。采用注射温度140℃，注射压力65MPa，注射成形坯样。坯样经过5小时的正庚烷溶剂脱脂和600℃的热脱脂脱除全部粘结剂后，采用氢气保护和真空烧结的方式对脱脂坯样进行烧结处理，在940℃烧结3小时，在930℃烧结3小时，制备出HRB77，75%IACS的氧化铝弥散强化铜产品，产品电镜图见图3。 The raw material powder composition ratio is 99.3% -300 mesh electrolytic copper powder, 0.7% -250 mesh alumina powder; then add stearic acid accounting for 5% of the above raw material quality, and put it into a grinding tank made of red copper, The balls are also made of red copper, the atmosphere of ball milling is air, the ratio of ball to material is 10:1, the speed of ball milling is 180r/min, and the milling time is 14 hours. Use 60~70% paraffin, 10~15% low density polyethylene, 10~15% high density polyethylene, 5~10% stearic acid thermoplastic system binder. Using an injection temperature of 140°C and an injection pressure of 65MPa, the blank sample is injection molded. After degreasing with n-heptane solvent for 5 hours and thermal degreasing at 600°C to remove all the binders, the degreased green sample was sintered by hydrogen protection and vacuum sintering, and sintered at 940°C for 3 hours. After sintering at ℃ for 3 hours, HRB77, 75% IACS aluminum oxide dispersion strengthened copper product was prepared. The electron micrograph of the product is shown in Figure 3.
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