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Method for preparing ultrafine tungsten copper composite powder by low-temperature combustion method

A low-temperature combustion and composite powder technology, applied in the field of material processing, can solve the problems that the performance cannot meet the increasingly high requirements of modern technology, the difficulty of sintering full densification, and the large porosity. Phase separation, the effect of increasing the speed of crystallization

Inactive Publication Date: 2012-07-25
XIAMEN HONGLU TUNGSTEN MOLYBDENUM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, tungsten-copper material is a typical pseudo-alloy. Because tungsten and copper are incompatible, it is difficult to sinter and fully densify, and the porosity is large, so it has a great influence on the thermal conductivity, air tightness and mechanical properties of the material. Adverse effects of
The performance of products produced by traditional ordinary powder mixing, molding and sintering processes can no longer meet the increasingly high requirements of modern technology

Method used

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  • Method for preparing ultrafine tungsten copper composite powder by low-temperature combustion method
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  • Method for preparing ultrafine tungsten copper composite powder by low-temperature combustion method

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Embodiment 1

[0024] Embodiment 1, a method for preparing ultrafine tungsten-copper composite powder by a low-temperature combustion method of the present invention comprises the following steps:

[0025] Step a. adopting ammonium paratungstate (APT) and copper salt, citric acid and polyethylene glycol as raw materials;

[0026] Step b. Mix the above raw materials, and add water to configure a transparent citric acid sol system; wherein, the copper salt is copper nitrate; ammonium paratungstate (APT), copper nitrate, water, citric acid, polyethylene glycol are 55 : 183: 600: 250: 3 mass ratio is made into a solution, and a transparent sol system is formed after uniform stirring;

[0027] Step c. Place the above-mentioned sol system in a spray tower, dry it by spraying, and then pass the dried powder into a reaction kettle built in the spray tower to carry out a low-temperature combustion reaction. The temperature of the low-temperature combustion is 300 ° C, so that Obtain precursor powder...

Embodiment 2

[0034] Embodiment 2, a method for preparing ultra-fine tungsten-copper composite powder by a low-temperature combustion method of the present invention includes the following steps:

[0035] Step a. using ammonium metatungstate (AMT) and copper salt, citric acid and polyethylene glycol as raw materials;

[0036] Step b. Mix the above raw materials, and add water to configure a transparent citric acid sol system; wherein, the copper salt is copper nitrate; ammonium metatungstate (AMT), copper nitrate, water, citric acid, polyethylene glycol according to A mass ratio of 165:50:30:200:2 is prepared into a solution, and a transparent sol system is formed after uniform stirring;

[0037] Step c. Place the above-mentioned sol system in a spray tower, dry it by spraying, and then pass the dried powder into a reaction kettle built in the spray tower to carry out a low-temperature combustion reaction. The temperature of the low-temperature combustion is 200 ° C, so that Obtain precurs...

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Abstract

The invention discloses a method for preparing ultrafine tungsten copper composite powder by a low-temperature combustion method, which comprises the following steps: using ammonium para-tungstate (APT) or ammonium meta-tungstate (AMT), a copper salt, citric acid and polyethylene glycol as raw materials; mixing the raw materials and adding water to prepare a transparent citric acid sol system; putting the sol system in a spray tower, and obtaining precursor powder by means of spraying and low-temperature combustion; and finally, carrying out reduction on the precursor powder to obtain ultrafine tungsten copper composite powder. The method has the advantages of energy consumption conservation, being simple in process, large in yield ratio, and being suitable for large-scale industrialization production. By using the methods of sol spraying and low-temperature combustion, the speed of crystallization is improved and the phase separation of tungsten and copper is reduced. Particularly, the composite powder is ignited in a reaction kettle to carry out low-temperature combustion, so that the energy can be saved and the subsequent calcining procedure can be canceled through the low-temperature combustion of the composite powder on one hand, and the yield ratio can be improved to a larger extent on the other hand.

Description

technical field [0001] The invention relates to the technical field of material processing, in particular to a method for preparing ultrafine tungsten-copper composite powder by a low-temperature combustion method. Background technique [0002] W-Cu composite material has good thermal conductivity, arc erosion resistance, welding resistance and high temperature resistance due to the combination of high melting point, low linear expansion coefficient, high strength of tungsten and good electrical and thermal conductivity of copper. Oxidation and other characteristics, it has been mainly used as electrical contacts of high-voltage switchgear for a long time, and it is also an important material for rocket nozzle throat linings and other components in aerospace technology that are resistant to high temperature and thermal erosion for a short time. [0003] In this era of continuous technological development and innovation, the excellent mechanical properties, thermal and electr...

Claims

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Application Information

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IPC IPC(8): B22F9/20B22F9/08B22F9/16
Inventor 许龙山于洋宋久鹏曾雄赖亚洲庄志刚
Owner XIAMEN HONGLU TUNGSTEN MOLYBDENUM IND CO LTD
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