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Method for manufacturing CuWCr composite material by using WCr alloy powder

A composite material and alloy powder technology, which is applied in the field of manufacturing CuWCr composite materials with WCr alloy powder, can solve the problems of low chromium powder reduction temperature, low density of tungsten-chromium-copper composite materials, insufficient reduction, etc., and achieve material structure and Stable performance, good arc stability, and easy process control

Inactive Publication Date: 2010-02-10
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of the powder metallurgy method is that the reduction temperature of the chromium powder is low and the reduction is insufficient, resulting in high oxygen content in the material; moreover, the density of the tungsten-chromium-copper composite material produced by the powder metallurgy method is low, and there are many pores in the material, which affects the hardness and hardness of the material. Conductivity
The microstructure of the CuWCr composite prepared by sintering infiltration method has independent chromium phase or tungsten phase, which reduces the withstand voltage strength of the material

Method used

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  • Method for manufacturing CuWCr composite material by using WCr alloy powder
  • Method for manufacturing CuWCr composite material by using WCr alloy powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Put 50% of tungsten powder and 50% of chromium powder into the ball mill, add absolute ethanol to the ball mill tank according to 2% of the total mass of tungsten powder and chromium powder, and add hard alloy according to 50 times the total mass of tungsten powder and chromium powder Grinding balls: Exclude the air in the ball milling tank with nitrogen, seal the ball milling tank, turn on the circulating cooling water in the ball milling tank, and mill for 100 hours; after the ball milling is over, let it stand for cooling, then take out the powder to obtain fully alloyed tungsten Chromium powder.

[0021] The tungsten-chromium alloy powder is molded into a billet, and the porosity of the billet is controlled to 10% according to the composition requirements of copper in the required material. The pressed billet is placed in a hydrogen sintering furnace, and the temperature is raised to 1100 at a rate of 15°C / min. ℃, sintering for 180 minutes to make it sintered into a...

Embodiment 2

[0024] Put 33% of tungsten powder and 67% of chromium powder into the ball mill, add analytical pure acetone in the ball mill tank according to 4% of the total mass of the powder, and add stainless steel grinding balls according to 80 times the total mass of the powder, with different diameters according to 1: 1 configuration; use argon to remove the air in the ball mill tank, and seal the ball mill tank; open the circulating cooling water in the ball mill tank, and mill for 80 hours; after the ball mill is finished, take out the powder after standing for cooling to obtain fully alloyed tungsten Chromium powder.

[0025] The tungsten-chromium alloy powder is subjected to cold isostatic pressing to make a billet, and the porosity of the billet is controlled to 25% according to the composition requirements of copper in the required material, and the pressed billet is vacuum sintered in the furnace to vacuumize to a vacuum degree greater than 10 -2 Pa, heat up to 1500°C at a rate...

Embodiment 3

[0028] Put 25% of tungsten powder and 75% of chromium powder into the ball mill, add absolute ethanol to the ball mill tank according to 5% of the total mass of the powder, and add agate balls according to 100 times the total mass of the powder; Vacuum to 10 -1 Pa, open the cooling water of the ball mill tank, and ball mill for 60 hours; after the ball mill is finished, take out the powder after standing for cooling, and obtain fully alloyed tungsten-chromium alloy powder.

[0029] The tungsten-chromium alloy powder is molded into a billet, and the porosity of the billet is controlled to 40% according to the copper composition requirements in the required material. The pressed billet is placed in a hydrogen sintering furnace, and the temperature is raised to 1450°C at a speed of 20°C / min. , sintered for 100 minutes to form a skeleton;

[0030] Take out the billet after sintering and reduction after cooling, add a sufficient amount of copper block, put it into a vacuum furnace...

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Abstract

The invention discloses a method for preparing CuWCr composite material from WCr alloy powder. The method comprises the steps as follow: mill tungsten powder and chromium powder inside a ball mill tomake the powder full alloying; then the blank is made by infiltrating with copper after suppressing and high temperature sintering the alloy. The invention is characterized in that the microscopic constitution of the composite material which is made of WCr alloy powder takes the CrW solid solution as the skeleton and takes the CrCu alloy as the matrix. The CuWCr composite material produced by themethod has the advantages of even structure, good performance, easy controlling of the production technology, high voltage proof intensity, low interception value, long arcing time and excellent arc stability.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and relates to a method for manufacturing CuWCr composite material, in particular to a method for manufacturing CuWCr composite material with WCr alloy powder. Background technique [0002] At present, the methods for preparing CuWCr composite materials include powder metallurgy and sintering infiltration, both of which use W powder and Cr powder to directly prepare CuWCr composite materials. The disadvantage of the powder metallurgy method is that the reduction temperature of the chromium powder is low and the reduction is insufficient, resulting in high oxygen content in the material; moreover, the density of the tungsten-chromium-copper composite material produced by the powder metallurgy method is low, and there are many pores in the material, which affects the hardness and Conductivity. The microstructure of CuWCr composites prepared by sintering infiltration method has indepen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/04B22F3/16B22F9/04
Inventor 肖鹏范志康梁淑华
Owner XIAN UNIV OF TECH
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