CN1050223A - Material for cu-cr-fe vacuum contact finger - Google Patents
Material for cu-cr-fe vacuum contact finger Download PDFInfo
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- CN1050223A CN1050223A CN 90108738 CN90108738A CN1050223A CN 1050223 A CN1050223 A CN 1050223A CN 90108738 CN90108738 CN 90108738 CN 90108738 A CN90108738 A CN 90108738A CN 1050223 A CN1050223 A CN 1050223A
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- copper
- chromium
- contact material
- vacuum
- voltage
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Abstract
The present invention is the copper croloy.Mainly be applicable to countact material for vacuum circuit breakers.It is characterized in that adding iron on the basis, form copper-chromium-iron alloy at copper-Chrome metal powder.It adopts mixed powder sintering pressure sintering or infiltration method to make contact material.Not only have high physical strength, low welding tendency and low shut off value, and breaking current is big, disjunction voltage height can prepare the more vacuum interrupter of high-voltage and Geng Gao current class.Simultaneously, owing to do not contain the noble metal element in the alloy, so cost is low.
Description
The invention belongs to copper-croloy.Mainly be applicable to the contact material of vacuum interrupter.
Vacuum interrupter is widely used in each industrial sector day by day owing to its series of advantages, has become the main developing direction of present middle and high device for switching.It requires contact material to have high insulation strength, big connecting-disconnecting function, little electrocorrosion, high physical strength, low welding tendency, low shut off value and can keep reliable operation under the high vacuum etc.
The vacuum contact material that uses has copper-tungsten, copper-bismuth and copper-chromium etc. at present.Copper-tungsten contact has the mechanical property that high insulation strength, little electrocorrosion are become reconciled, but when cut-offfing big electric current, cut-off failure owing to the high thermal electron emission effect of tungsten produces, therefore can only be used for occasion (JP55-78429) less than the less dropout current of 10KA.Copper-bismuth contact has good anti-melting welding ability and high conductivity, but because the low melting point of bismuth and high volatility make the insulation strength of copper-bismuth contact lower, electrocorrosion is big, should not be used for the vacuum interrupter that voltage is higher, electric current is bigger.Copper-Chrome metal powder is present countact material for vacuum circuit breakers with the most use, and it has reasonable over-all properties, can satisfy the service requirements of most of vacuum interrupter.But at present copper-chromium the vacuum contact that uses still exist resistance fusion welding can be relatively poor, shortcoming such as shut off value is higher and the relative density of material is lower.
Chinese patent CN85108080A provides another kind of vacuum contact material, and it is to add niobium or tantalum in the copper chrome molybdenum, can improve its breaking characteristics and voltage-resistent characteristic.Its withstand voltage properties is 1.2～1.5 times of copper-chromium contact, and disjunction voltage is 7.2KV and 12.5KV.But the disjunction voltage of this contact still can not satisfy more high-tension disjunction requirement; In addition, molybdenum, niobium, tantalum are expensive rare metal, so this contact material cost height.
The object of the present invention is to provide a kind of new countact material for vacuum circuit breakers, this contact material is insulation strength and physical strength height not only, and welding tendency is little and shut off value is low, and breaking current is big, disjunction voltage is higher, can be used for the more vacuum interrupter of voltage levels.
At above-mentioned purpose, the invention provides the new contact material of a kind of copper-chromium-iron system, on the chromiumcopper basis, add iron.
Copper provides good electrical and thermal conductivity performance and other fundamental property as basic alloy constituent element, and satisfying contact material can be by enough big current capacity.Another major components is a chromium, and it has fusing point and the intensity much higher than copper, and minimal amounts of dissolved copper, improves physical strength, high-temperature behavior, anti-electric-arc ability and the withstand voltage properties of contact material; Simultaneously, elemental gas such as chromium and oxygen, nitrogen have high chemical affinity, make it as contact material, in vacuum switch tube, have air-breathing and keep the vital role of condition of high vacuum degree.The 3rd constituent element is iron, its fusing point is higher than copper and is lower than chromium, therefore, under same sintering or infiltrating temperature, it in copper, and forms ferrochrome exothermic with chromium than the easier diffusion dissolution of chromium, like this, improve copper phase and chromium hardness and intensity mutually respectively, further improved physical strength, anti-electric-arc ability and the withstand voltage properties of contact material; And iron also forms alloy with chromium and copper simultaneously, makes contact material no matter improve the densification degree of alloy when sintering or infiltration, obtains highdensity material; Simultaneously,, when the disjunction of vacuum switch, reduced required disjunction power, promptly improved the resistance fusion welding energy of contact material because iron and copper and chromium have formed harder and more crisp alloy; In addition, according to the rule of contact material shut off value, the shut off value of ternary alloy is lower than the shut off value of binary alloy, so the shut off value of copper-chromium of the present invention-iron contact material further reduces than contact materials such as copper-chromium.
In sum, the concrete chemical ingredients (weight %) of vacuum contact material of the present invention is C μ 47～72%, Cr25～51%, Fe2～6%.
Vacuum contact material of the present invention adopts mixed powder sintering pressure sintering or infiltration method to make.The mixed powder sintering pressure sintering is that copper powder, chromium powder, iron powder or ferrochrome powder are prepared burden by design composition scope; thorough mixing is even in mixing tank then; and at metal pattern or plastic film medium-pressure type; the blank of being suppressed is put sintering in the sintering oven into; sintering temperature is 900～1200 ℃, and 1～3 hour time, the blank behind the sintering is suitably carrying out hot pressing or forge hot under the heating state; make the vacuum contact material that relative density surpasses 99% theoretical density thus, after machining, make vacuum contact.
According to above-mentioned chemical ingredients scope and the made vacuum contact material of production method, its density is 7.8～8.3g/cm
3, relative density reaches 99.2～99.6%, and hardness HB can reach 140, made contact, its breaking current can reach 40KA, and disjunction voltage can reach 36KV.
Compared with prior art, the present invention has following advantage:
1. the relative density height can reach 99.6%, helps improving the mechanical property of material and electrical property etc.
2. physical strength height, hardness HB can reach 140.
3. breaking current is big, can reach 40KA; Disjunction voltage height can reach 36KV, thereby can be made into the more vacuum interrupter of high-voltage and Geng Gao current class.
4. the welding tendency of alloy is little, and shut off value is low.
5. in the alloying constituent, do not have noble element, thereby cost is low.
The present invention is further described below in conjunction with drawings and Examples.
Embodiment
5 batches of vacuum contact materials have been prepared according to chemical ingredients scope provided by the present invention and production method.Its concrete chemical ingredients, production method and performance index are respectively shown in table 1, table 2.
The chemical ingredients of table 1, embodiment (weight %) and production method
| Lot number | Chemical ingredients (weight %) | Production method | ||
| | Cr | Fe | ||
| 1 2 3 4 5 | 72 48 65 47 56 | 26 47 32 47 40 | 2 5 3 6 4 | Mixed powder sintering pressure sintering " " infiltration method mixed powder sintering pressure sintering |
The performance index of table 2, embodiment
| Lot number | Density | Hardness HB | Electric conductivity m/ Ω mm 2 | The actual drop-out voltage KV that uses | |
| g/cm 3 | Relative % | ||||
| 1 2 3 4 5 | 8.28 7.92 8.17 7.88 8.02 | 99.2 99.6 99.3 99.2 99.3 | 79 131 98 136 107 | 25.6 12.2 21.4 11.9 15.3 | 27.5 35 27.5 35 35 |
Claims (1)
- A kind of vacuum interrupter contact material is characterized in that its chemical ingredients (weight %) is: Cu47～72%, Cr25～51%, Fe2～6%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90108738 CN1016185B (en) | 1990-11-03 | 1990-11-03 | Material for cu-cr-fe vacuum contact finger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90108738 CN1016185B (en) | 1990-11-03 | 1990-11-03 | Material for cu-cr-fe vacuum contact finger |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1050223A true CN1050223A (en) | 1991-03-27 |
| CN1016185B CN1016185B (en) | 1992-04-08 |
Family
ID=4881108
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 90108738 Expired CN1016185B (en) | 1990-11-03 | 1990-11-03 | Material for cu-cr-fe vacuum contact finger |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1016185B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100355924C (en) * | 2003-09-05 | 2007-12-19 | 上海材料研究所 | Tungsten copper functional composite material and its preparation technology |
| CN103201059A (en) * | 2010-08-03 | 2013-07-10 | 普兰西电力技术股份公司 | Process for producing a cu-cr material by powder metallurgy |
| CN109351977A (en) * | 2018-10-18 | 2019-02-19 | 西安交通大学 | A kind of preparation method containing cored copper-chromium contact material |
-
1990
- 1990-11-03 CN CN 90108738 patent/CN1016185B/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100355924C (en) * | 2003-09-05 | 2007-12-19 | 上海材料研究所 | Tungsten copper functional composite material and its preparation technology |
| CN103201059A (en) * | 2010-08-03 | 2013-07-10 | 普兰西电力技术股份公司 | Process for producing a cu-cr material by powder metallurgy |
| CN103201059B (en) * | 2010-08-03 | 2016-06-29 | 普兰西电力技术股份公司 | The powder metallurgically manufacturing method of Cu-Cr material |
| CN109351977A (en) * | 2018-10-18 | 2019-02-19 | 西安交通大学 | A kind of preparation method containing cored copper-chromium contact material |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1016185B (en) | 1992-04-08 |
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| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C13 | Decision | ||
| GR02 | Examined patent application | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C53 | Correction of patent for invention or patent application | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: PATENTEE; FROM: GENERAL RESEARCH INST. OF IRON AND STEEL, MINISTRY OF METALLURGICAL INDUSTRY TO: ANTAI SCIENCE AND TECHNOLOGY CO., LTD. |
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| CP01 | Change in the name or title of a patent holder |
Patentee after: Antai Science and Technology Co., Ltd. Patentee before: Iron and Steel Central Research Institute of Ministry of Metallurgical Industry |
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| C15 | Extension of patent right duration from 15 to 20 years for appl. with date before 31.12.1992 and still valid on 11.12.2001 (patent law change 1993) | ||
| OR01 | Other related matters | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |