CN101540237B - Preparation process of low-oxygen copper chromium contact - Google Patents
Preparation process of low-oxygen copper chromium contact Download PDFInfo
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- CN101540237B CN101540237B CN200910022274XA CN200910022274A CN101540237B CN 101540237 B CN101540237 B CN 101540237B CN 200910022274X A CN200910022274X A CN 200910022274XA CN 200910022274 A CN200910022274 A CN 200910022274A CN 101540237 B CN101540237 B CN 101540237B
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- copper chromium
- hydrazine hydrate
- chromium powder
- copper
- chromium
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Abstract
The invention relates to a preparation process of a low-oxygen copper chromium contact. Proper hydrazine hydrate is added before copper chromium powder is pressed, oxide is reduced to pure metal, because the hydrazine hydrate has stronger volatility, reduced other products and redundant hydrazine hydrate can be completely removed when in sintering, and the purpose of effectively lowering oxygen content in the copper chromium contact is achieved.
Description
Technical field
The present invention relates to a kind of material preparation process, particularly a kind of preparation technology of low-oxygen copper chromium contact.
Background technology
The Cu-Cr alloy is because its intensity height, good conductivity and become a kind of high-performance electric work can material.Containing Cr amount is positioned at Cu-Cr alloy between 25%～50% (wt%) and can be prepared among the high pressure vacuum circuit-breaker that contact is widely used in transmission system.For reliability, fail safe and the life-span that guarantees circuit breaker, the oxygen content of contact material requires to be lower than 500ppm.Powder metallurgic method is widely used in the manufacturing copper chromium contact, but necessary ball milling mixes in the powder process before the production of copper powder and chromium powder and powder metallurgy, oxidation takes place in copper and chromium powder end inevitably, the oxygen that contains of contact material is exceeded standard, open-assembly time in air prolongs with copper powder and chromium powder, oxidation increases the weight of, and usually makes contact material oxygen content severe overweight cause waste product.
Hydrazine hydrate is a kind of strong reductant, burning can be reduced into simple metal, but hydrazine hydrate never used in the contact production technology.
Summary of the invention
The objective of the invention is to overcome above-mentioned prior art deficiency, a kind of preparation technology of low-oxygen copper chromium contact is provided, this technology is to add the hydrazine hydrate of certain proportion scope in mixed copper chromium powder end, oxide in the powder is reduced into simple metal, obviously reduces the oxygen content of product and improve rate of finished products.
Technical scheme of the present invention is achieved in that a kind of preparation technology of low-oxygen copper chromium contact, it is characterized in that, granularity is accounted for the ratio of the 24%-40% of copper chromium powder end total weight in chromium powder less than 250 purpose chromium powders less than 200 purpose copper powders and granularity, mix, the hydrazine hydrate that accounts for above-mentioned copper chromium powder end total weight 1%～5% is joined among the above-mentioned copper chromium powder end, and mix, to directly be joined by the wetting powder of hydrazine hydrate and be pressed into base in the mould, with blank put into vacuum furnace routinely sintering process sinter contact into.
The present invention added an amount of hydrazine hydrate before the compacting of copper chromium powder end, oxide is reduced into simple metal, because hydrazine hydrate has very strong volatility, other product that restores and unnecessary hydrazine hydrate can be removed when sintering fully, reach the purpose that reduces oxygen content in the copper chromium contact effectively.
Embodiment
Embodiment one
A kind of preparation technology of low-oxygen copper chromium contact, 230 purpose copper powders and 270 purpose chromium powders are accounted for 40% ratio of copper chromium powder end total weight in chromium powder, mix, the hydrazine hydrate that accounts for above-mentioned copper chromium powder end total weight 1% is joined among the above-mentioned copper chromium powder end, and mix, to directly be joined by the wetting powder of hydrazine hydrate and be pressed into base in the mould, with blank put into vacuum furnace routinely sintering process sinter contact into.
The contact oxygen content of present embodiment preparation reduces more than 20% than the product that does not add hydrazine hydrate under the same terms.
Embodiment two
A kind of preparation technology of low-oxygen copper chromium contact, 230 purpose copper powders and 270 purpose chromium powders are accounted for 35% ratio of copper chromium powder end total weight in chromium powder, mix, the hydrazine hydrate that accounts for above-mentioned copper chromium powder end total weight 2% is joined among the above-mentioned copper chromium powder end, and mix, to directly be joined by the wetting powder of hydrazine hydrate and be pressed into base in the mould, with blank put into vacuum furnace routinely sintering process sinter contact into.
The contact oxygen content of present embodiment preparation reduces more than 25% than the product that does not add hydrazine hydrate under the same terms.
Embodiment three
A kind of preparation technology of low-oxygen copper chromium contact, 270 purpose copper powders and 300 purpose chromium powders are accounted for 30% ratio of copper chromium powder end total weight in chromium powder, mix, the hydrazine hydrate that accounts for above-mentioned copper chromium powder end total weight 3% is joined among the above-mentioned copper chromium powder end, and mix, to directly be joined by the wetting powder of hydrazine hydrate and be pressed into base in the mould, with blank put into vacuum furnace routinely sintering process sinter contact into.
The contact oxygen content of present embodiment preparation reduces more than 30% than the product that does not add hydrazine hydrate under the same terms.
Embodiment four
A kind of preparation technology of low-oxygen copper chromium contact, 325 purpose copper powders and 300 purpose chromium powders are accounted for 25% ratio of copper chromium powder end total weight in chromium powder, mix, the hydrazine hydrate that accounts for above-mentioned copper chromium powder end total weight 4% is joined among the above-mentioned copper chromium powder end, and mix, to directly be joined by the wetting powder of hydrazine hydrate and be pressed into base in the mould, with blank put into vacuum furnace routinely sintering process sinter contact into.
The contact oxygen content of present embodiment preparation reduces more than 35% than the product that does not add hydrazine hydrate under the same terms.
Embodiment five
A kind of preparation technology of low-oxygen copper chromium contact, 400 purpose copper powders and 325 purpose chromium powders are accounted for 25% ratio of copper chromium powder end total weight in chromium powder, mix, the hydrazine hydrate that accounts for above-mentioned copper chromium powder end total weight 5% is joined among the above-mentioned copper chromium powder end, and mix, to directly be joined by the wetting powder of hydrazine hydrate and be pressed into base in the mould, with blank put into vacuum furnace routinely sintering process sinter contact into.
The contact oxygen content of present embodiment preparation reduces more than 40% than the product that does not add hydrazine hydrate under the same terms.
Claims (6)
1. the preparation technology of a low-oxygen copper chromium contact, it is characterized in that, granularity is accounted for the ratio of the 24%-40% of copper chromium powder end total weight in chromium powder less than 250 purpose chromium powders less than 200 purpose copper powders and granularity, mix, the hydrazine hydrate that accounts for above-mentioned copper chromium powder end total weight 1%～5% is joined among the above-mentioned copper chromium powder end, and mix, will directly be joined by the wetting powder of hydrazine hydrate and be pressed into base in the mould, with blank put into vacuum furnace routinely sintering process sinter contact into.
2. the preparation technology of a kind of low-oxygen copper chromium contact according to claim 1, it is characterized in that, 230 purpose copper powders and 270 purpose chromium powders are accounted for 40% ratio of copper chromium powder end total weight in chromium powder, mix, the hydrazine hydrate that accounts for above-mentioned copper chromium powder end total weight 1% is joined among the above-mentioned copper chromium powder end, and mix, will directly be joined by the wetting powder of hydrazine hydrate and be pressed into base in the mould, with blank put into vacuum furnace routinely sintering process sinter contact into.
3. the preparation technology of a kind of low-oxygen copper chromium contact according to claim 1, it is characterized in that, 230 purpose copper powders and 270 purpose chromium powders are accounted for 35% ratio of copper chromium powder end total weight in chromium powder, mix, the hydrazine hydrate that accounts for above-mentioned copper chromium powder end total weight 2% is joined among the above-mentioned copper chromium powder end, and mix, will directly be joined by the wetting powder of hydrazine hydrate and be pressed into base in the mould, with blank put into vacuum furnace routinely sintering process sinter contact into.
4. the preparation technology of a kind of low-oxygen copper chromium contact according to claim 1, it is characterized in that, 270 purpose copper powders and 300 purpose chromium powders are accounted for 30% ratio of copper chromium powder end total weight in chromium powder, mix, the hydrazine hydrate that accounts for above-mentioned copper chromium powder end total weight 3% is joined among the above-mentioned copper chromium powder end, and mix, will directly be joined by the wetting powder of hydrazine hydrate and be pressed into base in the mould, with blank put into vacuum furnace routinely sintering process sinter contact into.
5. the preparation technology of a kind of low-oxygen copper chromium contact according to claim 1, it is characterized in that, 325 purpose copper powders and 300 purpose chromium powders are accounted for 25% ratio of copper chromium powder end total weight in chromium powder, mix, the hydrazine hydrate that accounts for above-mentioned copper chromium powder end total weight 4% is joined among the above-mentioned copper chromium powder end, and mix, will directly be joined by the wetting powder of hydrazine hydrate and be pressed into base in the mould, with blank put into vacuum furnace routinely sintering process sinter contact into.
6. the preparation technology of a kind of low-oxygen copper chromium contact according to claim 1, it is characterized in that, 400 purpose copper powders and 325 purpose chromium powders are accounted for 25% ratio of copper chromium powder end total weight in chromium powder, mix, the hydrazine hydrate that accounts for above-mentioned copper chromium powder end total weight 5% is joined among the above-mentioned copper chromium powder end, and mix, will directly be joined by the wetting powder of hydrazine hydrate and be pressed into base in the mould, with blank put into vacuum furnace routinely sintering process sinter contact into.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910022274XA CN101540237B (en) | 2009-04-29 | 2009-04-29 | Preparation process of low-oxygen copper chromium contact |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910022274XA CN101540237B (en) | 2009-04-29 | 2009-04-29 | Preparation process of low-oxygen copper chromium contact |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101540237A CN101540237A (en) | 2009-09-23 |
| CN101540237B true CN101540237B (en) | 2010-11-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200910022274XA Expired - Fee Related CN101540237B (en) | 2009-04-29 | 2009-04-29 | Preparation process of low-oxygen copper chromium contact |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1990015425A1 (en) * | 1989-05-31 | 1990-12-13 | Siemens Aktiengesellschaft | PROCESS FOR PRODUCING A CuCr CONTACT MATERIAL FOR VACUUM SWITCHES AND APPROPRIATE CONTACT MATERIAL |
| CN1317589A (en) * | 2001-03-29 | 2001-10-17 | 西安建筑科技大学 | Process for preparing modified granular metal-base composition |
| EP1130608A3 (en) * | 2000-03-04 | 2003-09-03 | Metalor Technologies International S.A. | Process for the manufacture of a contact material for contacts elements for vacuum switches, contact material and contact elements |
| CN1619000A (en) * | 2003-11-19 | 2005-05-25 | 中国科学院金属研究所 | Production method of low oxygen low foreign impurity copper chromium alloy contact head |
-
2009
- 2009-04-29 CN CN200910022274XA patent/CN101540237B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1990015425A1 (en) * | 1989-05-31 | 1990-12-13 | Siemens Aktiengesellschaft | PROCESS FOR PRODUCING A CuCr CONTACT MATERIAL FOR VACUUM SWITCHES AND APPROPRIATE CONTACT MATERIAL |
| EP1130608A3 (en) * | 2000-03-04 | 2003-09-03 | Metalor Technologies International S.A. | Process for the manufacture of a contact material for contacts elements for vacuum switches, contact material and contact elements |
| CN1317589A (en) * | 2001-03-29 | 2001-10-17 | 西安建筑科技大学 | Process for preparing modified granular metal-base composition |
| CN1619000A (en) * | 2003-11-19 | 2005-05-25 | 中国科学院金属研究所 | Production method of low oxygen low foreign impurity copper chromium alloy contact head |
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| Publication number | Publication date |
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| CN101540237A (en) | 2009-09-23 |
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| C14 | Grant of patent or utility model | ||
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Assignee: Shaanxi Sirui Industries Co., Ltd. Assignor: Xi'an Jiaotong University Contract record no.: 2011610000138 Denomination of invention: Preparation process of low-oxygen copper chromium contact Granted publication date: 20101103 License type: Exclusive License Open date: 20090923 Record date: 20110726 |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101103 Termination date: 20140429 |