Tungsten copper alloy and preparation method thereof

A technology of tungsten-copper alloy and tungsten powder, which is applied in the field of tungsten-copper alloy and its preparation, can solve problems such as poor wettability, thermal conductivity and electrical conductivity reduction, achieve improved dispersion, simple process, and reduce the phenomenon of tungsten powder agglomeration Effect

Inactive Publication Date: 2019-01-18
JIANGSU JINGWEI VALVE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the poor wettability of tungsten and copper, a small amount of elements such as Ni and Co are often added in the process of densification liquid phase

Method used

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Examples

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Effect test

preparation example Construction

[0024] The invention provides a kind of preparation method of tungsten copper alloy, comprises the following steps:

[0025] (1) The induction plasma powder spheroidization device is used to perform plasma spheroidization treatment on pure tungsten powder and pure copper powder respectively to obtain spheroidized tungsten powder and spheroidized copper powder;

[0026] (2) Disperse the spheroidized tungsten powder obtained in step (1) into the copper plating solution, adjust the pH=11-14, heat to 50-85°C, keep stirring for 3-5 hours, filter, and dry to obtain copper-plated spheroidized Tungsten powder;

[0027] (3) Mix the spheroidized copper powder obtained in step (1) and the copper-plated spheroidized tungsten powder obtained in step (2) evenly, place it in a graphite mold, and then place it in a vacuum hot press. The heating rate of ℃ / min is raised to 1100-1200 ℃, and the temperature is kept for 15-30 minutes, and then the temperature is lowered to 1000-1050 ℃ with the co...

Embodiment 1

[0037] The parameters of the induction plasma powder spheroidization device are set as follows: the flow rate of the plasma generating gas is 30L / min, the protective layer gas is hydrogen, the flow rate is 80 L / min, the pressure of the synthesis chamber is 50kPa, the plasma power is 30kW, the powder delivery rate is 2kg / h, and the powder enters The location is in the middle of the high temperature zone, and the flow rate of powder feeding gas is 8 L / min.

[0038] Configure copper plating solution: Each liter of copper plating solution contains 10g copper sulfate, 20mL formaldehyde, 8mg sodium potassium tartrate, 10g 2,2’-bipyridyl, 60mL methanol, and the balance is water.

[0039] Prepare tungsten copper alloy by following steps:

[0040] (1) Using an induction plasma powder spheroidization device, plasma spheroidization treatment is performed on pure tungsten powder and pure copper powder with a purity of 99.8%, respectively, to obtain spheroidized tungsten powder and spheroi...

Embodiment 2

[0045] The parameters of the induction plasma powder spheroidization device are set as follows: the flow rate of the plasma generating gas is 60L / min, the protective layer gas is hydrogen, the flow rate is 400 L / min, the pressure of the synthesis chamber is 150kPa, the plasma power is 150kW, the powder delivery rate is 15kg / h, and the powder enters The location is in the middle of the high temperature zone, and the powder feeding gas flow rate is 20 L / min.

[0046] Configure copper plating solution: Each liter of copper plating solution contains 10g copper sulfate, 20mL formaldehyde, 8mg sodium potassium tartrate, 10g 2,2’-bipyridyl, 60mL methanol, and the balance is water.

[0047] Prepare tungsten copper alloy by following steps:

[0048] (1) Using an induction plasma powder spheroidization device, plasma spheroidization treatment is performed on pure tungsten powder and pure copper powder with a purity of 99.8%, respectively, to obtain spheroidized tungsten powder and spher...

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Abstract

The invention discloses a preparation method of a tungsten copper alloy. The preparation method comprises the steps that raw materials are subjected to spheroidizing through plasma, so that the raw materials turn to be spherical from polygonal, the dispersibility is greatly improved, the phenomenon of agglomeration of tungsten powder is reduced, evenly distribution of tungsten copper in the coppercladding process is guaranteed, therefore the surface of tungsten powder is sufficiently coated with copper, a solid phase hot pressing sintering method is adopted to prepare the tungsten copper alloy, in the solid phase hot pressing sintering process, rearrangement occurs when the power is subjected to short-time heat preservation at the temperature of 1100-1200 DEG C, the copper particles are separated from the surfaces of the tungsten particles and work together with the clad copper on the surface of the tungsten powder to improve the wettability of tungsten copper, so that the tungsten copper alloy is densificated in a short period, the tungsten copper alloy is cooled to be 1000-1050 DEG C at the speed of 2-5 DEG C/min, the copper fluidity is reduced, at the moment, the stress is applied so that the copper cannot be effused, and further densification of the tungsten copper alloy is facilitated. The obtained tungsten copper alloy has the fine grain size and uniform tissue due to the low sintering temperature and the short sintering time, meanwhile, the adopted preparation method is simple and convenient, the equipment is the commonly used equipment in the technical field, and therefore industrialized production is facilitated.

Description

technical field [0001] The invention relates to the technical field of alloy materials, in particular to a tungsten-copper alloy and a preparation method thereof. Background technique [0002] Tungsten-copper alloy is a two-phase structure pseudoalloy mainly composed of tungsten and copper elements. It is a metal matrix composite material. Due to the large difference in physical properties between metal copper and tungsten, it cannot be produced by melting and casting. Generally, powder alloy technology is used. in production. Tungsten copper alloy has a wide range of uses, most of which are used in aerospace, aviation, electronics, electric power, metallurgy, machinery, sports equipment and other industries, and secondly, it is also used to manufacture contacts and contacts of high-voltage electrical switches that are resistant to arc ablation. Rocket nozzle throat lining, tail rudder and other high-temperature components are also used as electrodes for electrical machin...

Claims

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Application Information

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IPC IPC(8): C22C27/04C22C1/04B22F1/00B22F1/02C23C18/40
CPCC22C1/045C22C27/04C23C18/405B22F1/065B22F1/142B22F1/17
Inventor 徐文进项红霞
Owner JIANGSU JINGWEI VALVE
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