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Preparation method of CuW70 contact material

A contact material and mixing technology, used in electrical components, electrical switches, circuits, etc., can solve the problem of uneven distribution of Cu and W phases, and achieve improved arc ablation resistance, uniform force, and uniform distribution. Effect

Inactive Publication Date: 2012-01-11
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a preparation method of CuW70 contact material, which solves the problem of uneven distribution of Cu and W phases in the structure of CuW contact material prepared by existing methods

Method used

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  • Preparation method of CuW70 contact material
  • Preparation method of CuW70 contact material
  • Preparation method of CuW70 contact material

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preparation example Construction

[0019] A preparation method of CuW70 contact material, the method is carried out as follows:

[0020] Step 1: Weigh the induced copper powder and the tungsten powder respectively according to the mass percentage of the induced copper powder in the tungsten powder as 5% to 8%, and put them into a mixing tank. The addition of induced copper powder, on the one hand, can improve the formability of the brittle powder and make the pore distribution in the tungsten compact (green body) more uniform; on the other hand, in the subsequent infiltration process, the induction in the porous skeleton of the tungsten compact Copper powder melts first, forming connected pores inside the skeleton, and "lures" the molten metal to be infiltrated into the skeleton. The driving force of this fusion of internal and external molten metal will facilitate the infiltration process, thereby improving the yield of the material. density.

[0021] Step 2: Add volatile organic solvent industrial ethanol in...

Embodiment 1

[0027] Weigh the induced copper powder and tungsten powder respectively according to the mass percentage of the induced copper powder in the tungsten powder as 8%, and put them into the mixing tank. Then add industrial ethanol in the mixing tank as a mixing process control agent until the powder has a wet feeling. Add non-equal diameter grinding balls for mixing according to twice the total mass of tungsten powder and copper powder. The diameters of the grinding balls are 8mm and 4mm respectively, and the mass ratio of the two kinds of grinding balls is 1:1.5. The mixing time was controlled at 7 hours to obtain mixed powder. Pour the mixed powder into the rubber sheath, and place a cotton felt pad or filter paper for filtering between the powder material surface and the rubber end plug of the rubber sheath. After the jacket mold is filled with powder, an end seal is applied to the filling port. Then use thin iron wire to bind the end plug and the seal of the rubber sheath. A...

Embodiment 2

[0029]Weigh the induced copper powder and tungsten powder respectively according to the mass percentage of the induced copper powder in the tungsten powder as 5.5%, and put them into the mixing tank. Then add industrial ethanol in the mixing tank as a mixing process control agent until the powder has a wet feeling. According to 2.1 times of the total mass of tungsten powder and copper powder, non-equal diameter grinding balls are added for mixing. The diameters of the grinding balls are 8mm and 4mm respectively, and the mass ratio of the two kinds of grinding balls is 1:1.6. The mixing time was controlled at 6.5 hours to obtain mixed powder. Pour the mixed powder into the rubber sheath, and place a cotton felt pad or filter paper for filtering between the powder material surface and the rubber end plug of the rubber sheath. After the jacket mold is filled with powder, an end seal is applied to the filling port. Then use thin iron wire to bind the end plug and the seal of the...

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Abstract

The invention discloses a preparation method of a CuW70 contact material, comprising the steps of: adding inducing copper powder into tungsten powder in certain proportion and mixing them well, putting the mixed powder into a rubber sheath which is then placed in the high pressure cylinder of a cold isostatic pressing machine so as to be pressed into a skeleton green body, and then preparing the CuW70 contact material through copper infiltration of the sintered skeleton. Due to disappeared copper-rich area and uniform two-phase distribution of the prepared CuW70 contact material by the methodof the invention, the material has rapidly moving cathode spot on the surface, effectively dispersed electric arc, less copper phase splashing, and improved ablation resistance.

Description

technical field [0001] The invention belongs to the technical field of material preparation and relates to a preparation method of CuW70 contact material. Background technique [0002] CuW alloys are widely used as contact materials in high voltage switches. With the development of high-voltage switches towards ultra-high voltage and large capacity, higher requirements are put forward for the comprehensive performance of CuW materials. It is necessary to research and develop new high-performance CuW contact materials. [0003] When the CuW alloy contacts complete the breaking work, a high-voltage arc will be generated between the moving and static arcing contacts, and the cathode spots that are constantly moving on the electrode surface are an important feature of the vacuum arc. When the vacuum arc occurs, the surface of the cathode shrinks into a cathode spot with high current density and constant movement. Because the work functions of Cu and W phases are different, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C27/04C22C1/04H01H11/04
Inventor 杨晓红梁淑华肖鹏邹军涛王献辉
Owner XIAN UNIV OF TECH
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