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Preparation method of tungsten-copper functional gradient material

A functionally graded material, tungsten-copper technology, applied in the field of materials engineering, can solve the problems of low preparation efficiency, easy introduction of impurities, and difficulty in controlling the particle size of tungsten-copper composite powder, achieving good uniformity, high purity, and simple process Effect

Active Publication Date: 2013-01-09
XIAMEN HONGLU TUNGSTEN MOLYBDENUM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is easy to introduce impurities when mechanical alloying is used to prepare tungsten-copper composite powder, and the preparation efficiency is low
At the same time, mechanical alloying is difficult to control the particle size of tungsten-copper composite powders with different components

Method used

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  • Preparation method of tungsten-copper functional gradient material
  • Preparation method of tungsten-copper functional gradient material
  • Preparation method of tungsten-copper functional gradient material

Examples

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Effect test

Embodiment 1

[0036] This embodiment is used to prepare a three-layer tungsten-copper functionally graded material, and the copper contents of the three layers are 10%, 32%, and 60% respectively. The specific implementation steps are as follows:

[0037] (1) Mix ammonium metatungstate, copper nitrate, and water into three kinds of solutions according to the mass ratio of 16:5:21, 10:13:23, and 1:4:5, and form a transparent sol after uniform stirring for 30 minutes system, the above sol was spray-dried at 140°C to obtain tungsten-copper composite precursor powders with three different tungsten-copper ratios.

[0038] (2) Calcining the above three kinds of tungsten-copper composite precursor powders in the air, the calcination temperature is 600°C, and the calcination time is 120 minutes, to obtain the corresponding three oxide composite powders.

[0039] (3) The above three oxide composite powders were mixed in H 2 Medium reduction, the reduction temperature is 700 ℃, respectively to obtai...

Embodiment 2

[0045] This embodiment is used to prepare a 4-layer tungsten-copper functionally graded material, and the copper contents of the 4 layers are 10%, 20%, 40%, and 80% respectively. The specific implementation steps are as follows:

[0046](1) Mix ammonium metatungstate, copper nitrate and water into 4 kinds of solutions according to the mass ratio of 16:5:21, 29:20:50, 5:9:15 and 1:11:12, and stir evenly for 30 A transparent sol system was formed after a few minutes. The above sol was spray-dried at 160°C to obtain four kinds of tungsten-copper composite precursor powders with different tungsten-copper ratios.

[0047] (2) The above four kinds of tungsten-copper composite precursor powders were calcined in air at a calcination temperature of 650°C and a calcination time of 90 minutes to obtain the corresponding four kinds of oxide composite powders.

[0048] (3) The above four kinds of oxide composite powders were mixed in H 2 Medium reduction, the reduction temperature is 60...

Embodiment 3

[0052] (1) Mix ammonium paratungstate, copper chloride, water, citric acid, and polyethylene glycol in proportions of 50:32:130:25:1, 21:31:80:15:1 and 9:31:70:12:1 The mass ratio of the solution was formulated into three kinds of solutions, and a transparent sol system was formed after uniform stirring for 30 minutes. The above sol was spray-dried at 120°C to obtain tungsten-copper composite precursor powders with three different tungsten-copper ratios.

[0053] (2) The above three kinds of tungsten-copper composite precursor powders were calcined in air at a calcination temperature of 500°C and a calcination time of 180 minutes to obtain the corresponding three oxide composite powders.

[0054] (3) The above three kinds of oxide composite powders were mixed in H 2 Medium reduction at a reduction temperature of 500°C, ultrafine tungsten-copper composite powders W30Cu (30% Cu content), W50Cu (50% Cu content) and W70Cu (70% Cu content) were obtained respectively.

[0055] (4)...

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Abstract

The invention discloses a preparation method of a tungsten-copper functional gradient material. The method comprises the following steps of: (1) adding a tungsten precursor and a copper precursor into water to prepare a plurality of parts of sol systems with different tungsten-copper weight ratios; adding a surfactant into the sol systems and drying a plurality of parts of the sol systems to obtain a plurality of parts of corresponding tungsten-copper compound precursor powder; (2) calcining a plurality of parts of the tungsten-copper compound precursor powder to be completely converted into a plurality of parts of corresponding oxide compound powder; (3) reducing a plurality of parts of the corresponding oxide compound powder to obtain a plurality of parts of corresponding ultra-fine tungsten-copper compound powder; (4) gradually paving the ultra-fine tungsten-copper compound powder in a mould layer by layer and pressing into a blank; and (5) sintering the blank to prepare the tungsten-copper functional gradient material. According to the preparation method disclosed by the invention, the tungsten-copper functional gradient materials of various designs can be realized; an interface between layers of the obtained material has no defects and the transition is natural.

Description

technical field [0001] The invention belongs to the field of material engineering, and in particular relates to a preparation method of a tungsten-copper functional gradient material. Background technique [0002] Tungsten-copper alloy is a pseudo-alloy composed of tungsten phase and copper phase that are incompatible with each other. This alloy has the advantages of high melting point, electric corrosion resistance, low expansion coefficient, and wear resistance of tungsten materials, and at the same time has high electrical conductivity of copper. It is widely used as a heat sink in electronic packaging, medium and high voltage electrical contacts, electrodes for EDM, welding electrodes, etc. In many cases, one side of the material is required to withstand high temperature, while the other side is to be connected with copper or copper alloy with good thermal conductivity. Due to the large difference in physical properties between tungsten and copper, it is difficult for a ...

Claims

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Application Information

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IPC IPC(8): B22F3/16
Inventor 宋久鹏刘俊勇于洋庄志刚练友运刘翔
Owner XIAMEN HONGLU TUNGSTEN MOLYBDENUM IND CO LTD
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