CN104538213A - Titanium boride enhancement silver-based contact material and preparing method thereof - Google Patents
Titanium boride enhancement silver-based contact material and preparing method thereof Download PDFInfo
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- CN104538213A CN104538213A CN201510018851.3A CN201510018851A CN104538213A CN 104538213 A CN104538213 A CN 104538213A CN 201510018851 A CN201510018851 A CN 201510018851A CN 104538213 A CN104538213 A CN 104538213A
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- silver
- titanium boride
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/02—Contacts characterised by the material thereof
- H01H1/021—Composite material
- H01H1/023—Composite material having a noble metal as the basic material
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
- H01H11/04—Apparatus or processes specially adapted for the manufacture of electric switches of switch contacts
- H01H11/048—Apparatus or processes specially adapted for the manufacture of electric switches of switch contacts by powder-metallurgical processes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H69/00—Apparatus or processes for the manufacture of emergency protective devices
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- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Materials Engineering (AREA)
- Powder Metallurgy (AREA)
- Contacts (AREA)
Abstract
The invention provides a titanium boride enhancement silver-based contact material and a preparing method of the contact material. The contact material is mainly composed of, by weight, 7-25% of titanium boride and the balance silver, or composed of, by weight, 7-25% of titanium boride, 0.01-7% of one or more mixtures of copper, nickel and chromium, and the balance silver. The preparing method comprises the steps of powder mixing, pressing, sintering, re-pressing, re-sintering and polishing. The titanium boride enhancement silver-based contact material is good in welding resistance, the preparing method is simple and practical, and the silver-based contact material has the arc ablation resisting characteristic, can be used for a long term, and has the advantages that contact resistance among resistors is low, and temperature of the contacts rises slowly and stably.
Description
Technical field
The present invention relates to a kind of titanium boride and strengthen silver based contact material and preparation method thereof.
Background technology
Contact is the core component of low-voltage electrical apparatus, plays connection, carrying and the task of breaking current, its good and bad safety and reliability directly affecting low-voltage electrical apparatus.The silver-colored tungsten of the many uses of current low-voltage circuit breaker, silver-colored tungsten carbide, silver-colored carbonization tungsten copper as contact material, because its resistance fusion welding can be good, characteristics such as arc ablation resistance and being widely used.But this with tungsten and tungsten carbide be mainly add phase contact material in Long-Time Service process, tungsten and tungsten carbide all can be oxidized, and with silver react contact surface formed nonconducting wolframic acid silver, contact Contact resistance is raised, causes electric apparatus temperature rise too high.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of resistance fusion welding that namely has being applied to low-voltage electrical apparatus can be good, the characteristic of arc ablation resistance, again can under Long-Time Service condition, the titanium boride that contact Contact resistance is low, contact temperature rise is low and stable strengthens silver based contact material.
Another technical problem that the present invention will solve is to provide this titanium boride and strengthens silver based contact material preparation method.
For solving above-mentioned first technical problem, the present invention forms primarily of the material of following percentage by weight: titanium boride 7wt%-25wt%, and surplus is silver.
Or form primarily of the material of following percentage by weight: titanium boride 7wt%-25wt%, the mixture 0.01wt%-7wt% of one or more in copper, nickel, chromium, surplus is silver.
For solving above-mentioned second technical problem, the present invention includes following steps:
A, mixed powder: taking percentage by weight is the titanium boride of 7wt%-25wt% and the silver of surplus, put into ball mill or mixed powder machine carries out mixed powder 1-4 hour;
B, compacting: the powder mixed is pressed on powder press regulation shape blank, pressure is 220-360MPa;
C, sintering: blank sinters 1-4 hour under vacuum or argon shield, sintering temperature 850-950 degree Celsius;
D, multiple pressure: the blank after sintering is carried out multiple pressure on forcing press, and pressure is 350-800Mpa;
E, resintering: the blank resintering 1-4 hour under vacuum or argon shield after multiple pressure, resintering temperature 850-950 degree Celsius;
F, polishing: the blank after resintering is put into centrifugal polishing machine, and add the alumina abrasive of equivalent weight, polishing 10-20 minute.
Can add the mixture of one or more in copper that percentage by weight is 0.01wt%-7wt%, nickel, chromium in described a step, surplus is silver.
Described silver adds with the form of silver powder, and granularity is 200-600 order; Described titanium boride adds with the form of titanium boride, and particle mean size is 0.5-4 micron; Described copper, nickel, chromium add with the form of powdery, and particle mean size is 0.5-3 micron.
Advantageous effect of the present invention is: because titanium boride has the crystal structure of six sides (AlB2), its fusing point is 2980 DEG C, there is very high hardness, oxidation resistance temperature can reach 1000 DEG C at sky and in gas, and heat conductivility, electric conductivity that tool is excellent, no matter be that titanium boride or titanium oxide all can not react with silver simultaneously, also would not generate the non-conductive layer of similar wolframic acid silver and so on, can not resistive formation be formed; Appropriate copper, nickel, chromium add the wetability that can increase between titanium boride and silver, the processability of material can either be improved like this, contact Contact resistance can be reduced again, improve the reliability of electrical equipment.The present invention has resistance fusion welding can be good, and the characteristic of arc ablation resistance, again can under Long-Time Service condition, the advantage that contact Contact resistance is low, contact temperature rise is low and stable.
Embodiment
Strengthen silver based contact material below in conjunction with embodiment to titanium boride of the present invention to be described in further detail:
Embodiment 1
Make the contact that titanium boride is by weight percentage 7wt%, surplus is silver:
A, mixed powder: weigh 9.3 kilograms, 300 object silver powder, particle mean size is the titanium boride powder 0.7 kilogram of 3 microns, put into ball mill or mixed powder machine carries out mixed powder 3 hours;
B, compacting: the powder mixed is pressed on powder press regulation shape blank, pressure is 350MPa;
C, sintering: blank sinters 3 hours under vacuo, sintering temperature 870 degrees Celsius;
D, multiple pressure: the blank after sintering is carried out multiple pressure on forcing press, and pressure is 550MPa;
E, resintering: the resintering 2 hours under argon shield of the blank after multiple pressure, resintering temperature 900 degrees Celsius;
F, polishing: the blank after resintering is put into centrifugal polishing machine, and add the alumina abrasive of 10 kilograms, polishing 15 minutes.
This contact is applied in intelligent universal open circuit, and breaking capacity improves about 5% than commercially available other types silver-based contact, and useful life improves 5%.
Embodiment 2
Make the contact that titanium boride is by weight percentage 20wt%, surplus is silver:
A, mixed powder: weigh the titanium boride powder 2 kilograms that particle mean size is 8 kilograms, 300 object silver powder, particle mean size is 1.5 microns, put into ball mill or mixed powder machine carries out mixed powder 2 hours;
B, compacting: the powder mixed is pressed on powder press regulation shape blank, pressure is 230MPa;
C, sintering: blank sinters 4 hours under vacuo, sintering temperature 900 degrees Celsius;
D, multiple pressure: the blank after sintering is carried out multiple pressure on forcing press, and pressure is 450MPa;
E, resintering: the resintering 3 hours under argon shield of the blank after multiple pressure, resintering temperature 870 degrees Celsius;
F, polishing: the blank after resintering is put into centrifugal polishing machine, and add the alumina abrasive of 10 kilograms, polishing 12 minutes.
This contact is applied in intelligent universal open circuit, and breaking capacity improves about 10% than commercially available other types silver-based contact, and useful life improves 5%.
Embodiment 3
Make the contact that titanium boride is by weight percentage 10wt%, chromium is 5%, surplus is silver:
A, mixed powder: weigh 8.5 kilograms, 300 object silver powder, to be titanium boride powder 1 kilogram, the particle mean size of 1 micron be particle mean size that the chromium powder 0.5 kilogram of 3 microns puts into ball mill or mixed powder machine carries out mixed powder 4 hours;
B, compacting: the powder mixed is pressed on powder press regulation shape blank, pressure is 350MPa;
C, sintering: blank sinters 2 hours under vacuo, sintering temperature 900 degree;
D, multiple pressure: the blank after sintering is carried out multiple pressure on forcing press, and pressure is 700MPa;
E, resintering: the resintering 4 hours under argon shield of the blank after multiple pressure, resintering temperature 950 degree;
F, polishing: the blank after resintering is put into centrifugal polishing machine, and add the alumina abrasive of 10 kilograms, polishing 18 minutes.
This contact is applied in intelligent universal open circuit, and breaking capacity improves about 8% than commercially available other types silver-based contact, and useful life improves 7%.
Embodiment 4
Make the contact that titanium boride is by weight percentage 15%, copper is 5wt%, surplus is silver:
A, mixed powder: weigh 8 kilograms, 300 object silver powder, copper powder 0.5 kilogram that titanium boride powder 1.5 kilograms that particle mean size is 3 microns, particle mean size are 1.5 microns, put into ball mill or mixed powder machine carries out mixed powder 3 hours;
B, compacting: the powder mixed is pressed on powder press regulation shape blank, pressure is 350MPa;
C, sintering: blank sinters 3 hours under vacuo, sintering temperature 850 degree;
D, multiple pressure: the blank after sintering is carried out multiple pressure on forcing press, and pressure is 500MPa;
E, resintering: the resintering 2 hours under argon shield of the blank after multiple pressure, resintering temperature 900 degree;
F, polishing: the blank after resintering is put into centrifugal polishing machine, and add the alumina abrasive of 20 kilograms, polishing 15 minutes.
This contact is applied in intelligent universal open circuit, and breaking capacity improves about 10% than commercially available other types silver-based contact, and useful life improves 8%.
Embodiment 5
Make that titanium boride powder is by weight percentage 10wt%, nickel is 3wt%, the contact of silver-colored surplus:
A, mixed powder: weigh 8.7 kilograms, 200 order silver powder, nickel powder 0.3 kilogram that titanium boride powder 1 kilogram that particle mean size is 3 microns, particle mean size are 1.5 microns, put into ball mill or mixed powder machine carries out mixed powder 3 hours;
B, compacting: the powder mixed is pressed on powder press regulation shape blank, pressure is 350MPa;
C, sintering: blank sinters 3 hours under vacuo, sintering temperature 850 degree;
D, multiple pressure: by the multiple pressure on crank press of the blank after sintering, pressure is 450MPa;
E, resintering: the resintering 2 hours under argon shield of the blank after multiple pressure, resintering temperature 900 degree;
F, polishing: the blank after resintering is put into centrifugal polishing machine, and add the alumina abrasive of 10 kilograms, polishing 15 minutes.
This contact is applied on certain miniature circuit breaker, and breaking capacity improves about 7% than commercially available other types silver-based contact, and useful life improves 9%.
Embodiment 6
Make the contact that titanium boride powder is by weight percentage 20wt%, nickel is 2wt%, surplus is silver:
A, mixed powder: weigh 7.8 kilograms, 600 object silver powder, nickel powder 0.2 kilogram that titanium boride powder 2 kilograms that particle mean size is 3 microns, particle mean size are 2 microns, put into ball mill or mixed powder machine carries out mixed powder 2 hours;
B, compacting: the powder mixed is pressed on powder press regulation shape blank, pressure is 350MPa;
C, sintering: blank sinters 3 hours under vacuo, sintering temperature 850 degree;
D, multiple pressure: by the multiple pressure on crank press of the blank after sintering, pressure is 450MPa;
E, resintering: the resintering 2 hours under argon shield of the blank after multiple pressure, resintering temperature 900 degree;
F, polishing: the blank after resintering is put into centrifugal polishing machine, and add the alumina abrasive of 10 kilograms, polishing 15 minutes.
This contact is applied on certain medium-sized circuit breaker, and breaking capacity improves about 5% than commercially available other types silver-based contact, and useful life improves 5%.
Embodiment 7
Make the contact that titanium boride powder is by weight percentage 15wt%, nickel powder is 0.5wt%, chromium is 0.5wt%, surplus is silver:
A, mixed powder: weigh 8.4 kilograms, 500 order silver powder, nickel powder 0.05 kilogram, all granularity that titanium boride powder 1.5 kilograms that particle mean size is 3 microns, particle mean size are 2 microns be that the titanium valve 0.05 kilogram of 2 microns puts into ball mill or mixed powder machine carries out mixed powder 3 hours;
B, compacting: the powder mixed is pressed on powder press regulation shape blank, pressure is 300MPa;
C, sintering: blank sinters 3 hours under argon shield, sintering temperature 950 degree;
D, multiple pressure: by the multiple pressure on crank press of the blank after sintering, pressure is 500MPa;
E, resintering: the resintering 2 hours under argon shield of the blank after multiple pressure, resintering temperature 900 degree;
F, polishing: the blank after resintering is put into centrifugal polishing machine, and add the alumina abrasive of 10 kilograms, polishing 15 minutes.
This contact is applied on miniature circuit breaker, and breaking capacity improves about 10% than commercially available other types silver-based contact, and useful life improves 15%.
In above-described embodiment, account for the copper in copper that percentage by weight is 0.01wt%-7wt%, nickel, chromium, nickel, a kind of element of chromium or multiple element mixing percentage by weight in 0.01wt%-7wt%.In raw material, silver adds with the form of silver powder, and particle mean size is 200-600 order; Titanium boride adds with the form of titanium boride powder, and particle mean size is 0.5-4 micron; Copper, nickel, chromium add with the form of powdery, and particle mean size is 0.5-3 micron.The inevitable impurity of trace is allowed in raw material.
The present invention is not limited to above-mentioned execution mode, and should be appreciated that design of the present invention can be implemented to use by other various forms, they drop in protection scope of the present invention equally.
Claims (5)
1. titanium boride strengthens a silver based contact material, it is characterized in that the material primarily of following percentage by weight forms: titanium boride 7wt%-25wt%, and surplus is silver.
2. titanium boride strengthens a silver based contact material, it is characterized in that the material primarily of following percentage by weight forms: titanium boride 7wt%-25wt%, the mixture 0.01wt%-7wt% of one or more in copper, nickel, chromium, and surplus is silver.
3. titanium boride strengthens a preparation method for silver based contact material, it is characterized in that comprising the following steps:
A, mixed powder: taking percentage by weight is the titanium boride of 7wt%-25wt% and the silver of surplus, put into ball mill or mixed powder machine carries out mixed powder 1-4 hour;
B, compacting: the powder mixed is pressed on powder press regulation shape blank, pressure is 220-360MPa;
C, sintering: blank sinters 1-4 hour under vacuum or argon shield, sintering temperature 850-950 degree Celsius;
D, multiple pressure: the blank after sintering is carried out multiple pressure on forcing press, and pressure is 350-800Mpa;
E, resintering: the blank resintering 1-4 hour under vacuum or argon shield after multiple pressure, resintering temperature 850-950 degree Celsius;
F, polishing: the blank after resintering is put into centrifugal polishing machine, and add the alumina abrasive of equivalent weight, polishing 10-20 minute.
4. titanium boride according to claim 3 strengthens the preparation method of silver based contact material, and it is characterized in that can adding in described a step the mixture of one or more in copper that percentage by weight is 0.01wt%-7wt%, nickel, chromium, surplus be silver-colored.
5. the titanium boride according to claim 3 or 4 strengthens the preparation method of silver based contact material, and it is characterized in that described silver adds with the form of silver powder, granularity is 200-600 order; Described titanium boride adds with the form of titanium boride, and particle mean size is 0.5-4 micron; Described copper, nickel, chromium add with the form of powdery, and particle mean size is 0.5-3 micron.
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| CN201510018851.3A CN104538213B (en) | 2015-01-15 | 2015-01-15 | Titanium boride enhancement silver-based contact material and preparing method thereof |
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| CN201510018851.3A CN104538213B (en) | 2015-01-15 | 2015-01-15 | Titanium boride enhancement silver-based contact material and preparing method thereof |
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| CN104538213A true CN104538213A (en) | 2015-04-22 |
| CN104538213B CN104538213B (en) | 2017-02-01 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108179297A (en) * | 2018-01-20 | 2018-06-19 | 云南大学 | A kind of new A g-ZnO electrical contact materials and preparation method thereof |
| CN108251683A (en) * | 2018-03-27 | 2018-07-06 | 西安理工大学 | A kind of silver based contact material and preparation method with high resistance fusion welding energy |
| CN108546842A (en) * | 2018-03-27 | 2018-09-18 | 西安理工大学 | A kind of AgTiB2Contact material and preparation method thereof |
| CN108546843A (en) * | 2018-03-27 | 2018-09-18 | 西安理工大学 | A kind of Ag-based electrical contact material and preparation method thereof of resistance to arc erosion |
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| CN103060656A (en) * | 2013-01-24 | 2013-04-24 | 陕西斯瑞工业有限责任公司 | Copper chromium contact composite material containing titanium diboride ceramic phase and preparation method thereof |
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2015
- 2015-01-15 CN CN201510018851.3A patent/CN104538213B/en active Active
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108179297A (en) * | 2018-01-20 | 2018-06-19 | 云南大学 | A kind of new A g-ZnO electrical contact materials and preparation method thereof |
| CN108251683A (en) * | 2018-03-27 | 2018-07-06 | 西安理工大学 | A kind of silver based contact material and preparation method with high resistance fusion welding energy |
| CN108546842A (en) * | 2018-03-27 | 2018-09-18 | 西安理工大学 | A kind of AgTiB2Contact material and preparation method thereof |
| CN108546843A (en) * | 2018-03-27 | 2018-09-18 | 西安理工大学 | A kind of Ag-based electrical contact material and preparation method thereof of resistance to arc erosion |
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| CN104538213B (en) | 2017-02-01 |
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