Tungsten-copper alloy prepared from copper-cerium alloy and preparation method thereof

A tungsten-copper alloy and alloy technology, applied in the field of tungsten-copper alloy preparation, can solve the problems of accelerated material failure, reduced material performance, loss of electrical conductivity, etc., to achieve improved alloy performance, low electrical conductivity, and increased maximum compression stress value Effect

Inactive Publication Date: 2010-08-11
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large difference between the melting points of copper and tungsten, tungsten is 3410°C and copper is 1084.5°C, and they are not completely wetted, and there are other impurities such as air and water adsorbed on the surface of the raw material, which affects the combination of tungsten and copper. Reduces the performance of the material; especially under high temperature loads, the tungsten-copper interface often becomes the source of cracks, accelerating the failure of the material
Although some studies have shown that some trace elements such as iron and nickel can be added to improve the interface bonding, but at the cost of loss of electrical conductivity, the result is not ideal

Method used

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  • Tungsten-copper alloy prepared from copper-cerium alloy and preparation method thereof
  • Tungsten-copper alloy prepared from copper-cerium alloy and preparation method thereof
  • Tungsten-copper alloy prepared from copper-cerium alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Step a. Place the corundum crucible in a ZRS-18Q vacuum furnace for heat preservation. The temperature is controlled at 300°C and preheated for 10 minutes.

[0025] Step b. Weigh strip cerium and copper, wherein cerium is 0.6% of copper, the quality of cerium weighed is 1.19g, the quality of copper is 198g, including copper rod 188g and copper powder 10g.

[0026] Polish the cerium surface with sandpaper, put it into a 188g copper rod drilled with blind holes, seal it with 10g copper powder, put it upside down into a corundum crucible, put it in a vacuum furnace, keep it warm at 920°C for 15 minutes, and keep it at 1150°C for 30 minutes. Finally, cool to room temperature with the furnace.

[0027] Step c. Stack the copper-cerium alloy and the tungsten skeleton together, put them into a graphite crucible, place them in a high-temperature hydrogen atmosphere sintering furnace, sinter the tungsten skeleton at 1040°C for 1 hour, and then infiltrate copper at 1250°C for 3 ho...

Embodiment 2

[0028] Example 2 (cerium is 1.2%)

[0029] Step a. Place the corundum crucible in a ZRS-18Q vacuum furnace for heat preservation. The temperature is controlled at 310°C and preheated for 12 minutes.

[0030] Step b. Weigh strip cerium and copper, wherein cerium is 1.2% of copper, the quality of cerium weighed is 2.34g, and the quality of copper is 195g, including copper rod 185g and copper powder 10g.

[0031] Polish the cerium surface with sandpaper, put it into a 185g copper rod drilled with blind holes, seal it with 10g copper powder, put it upside down into a corundum crucible, put it in a vacuum furnace, keep it warm at 900°C for 20 minutes, and keep it at 1050°C for 35 minutes. Finally, cool to room temperature with the furnace.

[0032] Step c. Stack the copper-cerium alloy and the tungsten skeleton together, put them into a graphite crucible, place them in a high-temperature hydrogen atmosphere sintering furnace, sinter the tungsten skeleton at 1000°C for 1.2 hours, a...

Embodiment 3

[0033] Embodiment 3 (cerium is 1.8%)

[0034] Step a. Place the corundum crucible in a ZRS-18Q vacuum furnace for heat preservation. The temperature is controlled at 290°C and preheated for 11 minutes.

[0035] Step b. Weigh strip cerium and copper, wherein cerium is 1.8% of copper, the quality of cerium weighed is 3.66g, and the quality of copper is 193g, including 183g of copper rod and 10g of copper powder.

[0036] Polish the cerium surface with sandpaper, put it into a 193g copper rod drilled with blind holes, seal it with 10g copper powder, put it upside down into a corundum crucible, put it in a vacuum furnace, keep it at 910°C for 18 minutes, and at 1100°C for 32 minutes. Finally, cool to room temperature with the furnace.

[0037] Step c. Stack the copper-cerium alloy and the tungsten skeleton together, put them into a graphite crucible, place them in a high-temperature hydrogen atmosphere sintering furnace, sinter the tungsten skeleton at 1020°C for 1 hour, and then...

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PUM

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Abstract

The invention discloses a tungsten-copper alloy prepared from a copper-cerium alloy by infiltration. The tungsten-copper alloy is prepared from the copper-cerium alloy of which cerium accounts for 0.6 to 2.4 percent of the mass of copper. The invention also discloses a method for preparing the tungsten-copper alloy, which comprises the following steps of: a, placing a corundum crucible in a vacuum furnace for heat preservation and pre-heating; b, weighing the cerium and the copper in a mass ratio of 0.6-2.4 percent:1, polishing the surface of strip-shaped rare earth, placing the polished rare earth into a copper bar, sealing the copper bar with copper powder, placing the sealed copper bar into the pre-heated corundum crucible, placing the corundum crucible in the vacuum furnace for smelting and finally cooling the smelted product along with the furnace to room temperature to obtain the copper-cerium alloy; and c, laminating the copper-cerium alloy prepared by the step b with a tungsten frame, placing the laminated product in a graphite crucible and then placing the graphite crucible in a high-temperature hydrogen atmosphere sintering furnace for sintering and infiltration to obtain the tungsten-copper alloy. The rigidity and the compression strength of the tungsten-copper alloy prepared by the method are obviously improved.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metals, and relates to a tungsten-copper alloy prepared by using a copper-cerium alloy, and also relates to a preparation method of the tungsten-copper alloy. Background technique [0002] Tungsten-copper contact materials are widely used in oil circuit breakers, sulfur hexafluoride circuit breakers, vacuum contactors, and transformer transfer switches because of their good arc erosion resistance, welding resistance and high strength. [0003] At present, the powder metallurgy method is generally used to prepare tungsten-copper alloys, and the better method is recognized as the infiltration method. The skeleton is usually made by pressing tungsten powder and additives into a green body, adopting cold isostatic pressing or molding, and sintering properly, then infiltrating copper liquid into the skeleton, and finally solidifying to form a tungsten-copper alloy. The interface bonding state betwe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C9/00C22C1/04
Inventor 梁淑华王博钱锟王献辉邹军淘
Owner XIAN UNIV OF TECH
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