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A kind of production method of fine-grained low-oxygen cucr contact material

A production method and technology for contact materials, which are used in transportation and packaging, metal processing equipment, etc., can solve the problems of coarse grains, infiltration, shrinkage holes, etc., and achieve the effect of easy mass industrial production and high process flexibility.

Inactive Publication Date: 2017-10-31
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In summary, the current powder metallurgy method for producing copper-chromium contact alloys is difficult to obtain products with low gas content, which have low density, coarse grains, shrinkage cavities and infiltration defects, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] This embodiment provides a production method of a fine-grained low-oxygen CuCr contact material. The production method uses electrolytic chromium powder with an oxygen content of 3000 ppm as a raw material. The purity of the electrolytic chromium powder is greater than 99.9%, and the particle size is 20 μm. The production includes The following steps:

[0029] Step 1, mix electrolytic chromium powder, copper powder and spectroscopically pure graphite powder to obtain a mixed powder, by weight, in the mixed powder, electrolytic chromium powder and copper powder are configured in a ratio of 25:75 500g, and spectroscopically pure graphite powder is added at the same time 2.5g.

[0030] Step 2: Under the protection of inert gas argon, use a three-dimensional mixer to uniformly mix the mixed powder in three directions for 4 hours.

[0031] Step 3: put the uniformly mixed powder into a graphite crucible, then put the graphite crucible into a box-type drying oven, and dry it ...

Embodiment 2

[0037] This embodiment provides a production method of a fine-grained low-oxygen CuCr contact material. The production method uses electrolytic chromium powder with an oxygen content of 3000 ppm as a raw material. The purity of the electrolytic chromium powder is greater than 99.9%, and the particle size is 30 μm. Include the following steps:

[0038] Step 1, mix electrolytic chromium powder, copper powder and spectroscopically pure graphite powder to obtain a mixed powder, by weight, in the mixed powder, electrolytic chromium powder and copper powder are configured in a ratio of 50:50 500g, and spectroscopically pure graphite powder is added at the same time 2g.

[0039] Step 2: Under the protection of inert gas helium, use a three-dimensional mixer to uniformly mix the mixed powder in three directions for 3 hours.

[0040] Step 3: put the uniformly mixed powder into the graphite crucible, then put the graphite crucible into a box-type drying oven, and dry it at a temperatur...

Embodiment 3

[0046]This embodiment provides a production method of a fine-grained low-oxygen CuCr contact material. The production method uses electrolytic chromium powder with an oxygen content of 3000 ppm as a raw material. The purity of the electrolytic chromium powder is greater than 99.9%, and the particle size is +200 mesh. Production includes the following steps:

[0047] Step 1, mix electrolytic chromium powder, copper powder and spectroscopically pure graphite powder to obtain a mixed powder, by weight, in the mixed powder, electrolytic chromium powder and copper powder are configured in a ratio of 40:60 to 500g, and spectroscopically pure graphite powder is added at the same time 1g.

[0048] Step 2: Under the protection of inert gas argon, use a three-dimensional mixer to uniformly mix the mixed powder in three directions for 4 hours.

[0049] Step 3: put the uniformly mixed powder into a graphite crucible, then put the graphite crucible into a box-type drying oven, and dry it ...

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Abstract

The invention provides a production method of a fine-grained low-oxygen CuCr contact material. The electrolytic chromium powder, copper powder and spectrally pure graphite powder are mixed to obtain a mixed powder, and a three-dimensional mixer is used to uniformly mix the mixed powder in three directions for 3~ 4h, put into a graphite crucible, then put it into a box-type drying oven to dry, put it into a vacuum hot-press furnace for vacuum heating and reduction, put the CuCr sintered sample into a bag and seal it; put the bag into a hot isostatic press Inside, fill inert gas to apply pressure load to 130-150MPa, heat up to 100-1080°C, keep warm for 3-4h, cool with furnace, and take out to obtain fine-grained low-oxygen CuCr contact material. The invention is also superior to the infiltration process in terms of grain size, sphericity, relative density and mechanical properties. The invention has the advantages of high process flexibility, easy mass industrial production, and a series of CuCr contact materials with different Cr contents can be produced through a set of equipment.

Description

technical field [0001] The invention belongs to the field of high-voltage electrical switch contact materials, and relates to a copper-chromium contact material, in particular to a production method of a fine-grained low-oxygen CuCr contact material. Background technique [0002] CuCr contacts are widely used in power systems due to their high electrical conductivity, thermal conductivity, good withstand voltage, anti-burning, anti-welding and low current interception, and are determined by gas, impurity content and microstructure. key to its performance. Low gas and impurity content ensures that the vacuum circuit breaker will not cause arc reignition and welding due to outgassing during the breaking process. The particle size of Cu and Cr should be as small as possible and distributed evenly. It is guaranteed that the arc energy will not accumulate in the chromium-rich place due to uneven or excessive Cr distribution during the breaking process, resulting in excessive ab...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05C22C9/00B22F1/00B22F3/15
CPCC22C1/05C22C9/00B22F3/15B22F2998/10B22F1/145B22F1/0003
Inventor 王发展张院陈海鹏
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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