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Method for preparing tungsten disilicide powder

A tungsten disilicide and powder technology is applied in the field of synthesizing tungsten disilicide powder, which can solve problems such as power consumption and achieve the effect of simple process

Inactive Publication Date: 2004-12-29
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this requires another set of devices to apply the electric field and consumes power

Method used

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  • Method for preparing tungsten disilicide powder
  • Method for preparing tungsten disilicide powder

Examples

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example 1

[0015] Example 1: First, mix titanium powder and graphite powder, tungsten powder and silicon powder in a molar ratio of 1:1 and 1:2, and mix them evenly, then put them into a crucible. The weight ratio of the Ti-C mixed powder and W-Si mixed powder installed in the crucible is 0.8:1, and the W-Si mixed powder is installed in the center of the crucible, and the Ti-C mixed powder is evenly packed between the W-Si mixed powder and the W-Si mixed powder. Between the crucibles, a layer of Ti-C mixed powder is finally placed on top of all mixed powders. After energizing the tungsten wire, ignite the Ti-C mixed powder in the top layer of the crucible.

example 2

[0016] Example 2: First, mix titanium powder and graphite powder, tungsten powder and silicon powder in a molar ratio of 1:1 and 1:2, and mix them evenly, then put them into a crucible. The weight ratio of the Ti-C mixed powder and W-Si mixed powder installed in the crucible is 1.2:1, and the W-Si mixed powder is installed in the center of the crucible, and the Ti-C mixed powder is evenly packed in the W-Si mixed powder and the W-Si mixed powder. Between the crucibles, a layer of Ti-C mixed powder is finally placed on top of all mixed powders.

[0017] As the Ti-C reaction spreads downward, the heat of reaction heats and ignites the W-Si mixed powder. In this way, all mixed powders can fully react. After getting WSi 2 At the same time as the powder, TiC powder can also be obtained.

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Abstract

The process of preparing tungsten disilicide includes the following steps: compounding tungsten powder and silicon powder in the molar ratio of 1 to 2, compounding titanium powder and graphite powder in the same molar ratio and mixing homogeneously and separately; filling W-Si mixture powder in the middle of crucible, Ti-C mixture powder between the W-Si mixture powder and crucible wall and one layer of Ti-C mixture powder on the top with the weight ratio between Ti-C mixture powder and W-Si mixture powder being 0.8-1.2; setting the crucible inside a sealed reactor, pumping out air, inflating argon and applying electricity via tungsten wire to initiate reaction in the mixture material; cooling, separating TiC and WSi2, and crushing separately to obtain TiC powder and WSi2 powder. The present invention has the advantages of simple technological process, low power consumption, short production period and the simultaneous synthesis of TiC powder and WSi2 powder.

Description

technical field [0001] The invention relates to a method for preparing tungsten disilicide powder. More specifically, it is a method for synthesizing tungsten disilicide powder by using tungsten powder and silicon powder as raw materials and utilizing the exothermic reaction between tungsten and silicon. Background technique [0002] Combustion synthesis, or self-propagating high-temperature synthesis, is a technique for synthesizing materials using exothermic reactions. For an exothermic reaction, the empirical thermodynamic criterion of whether it can be self-sustained until all materials are reacted is the adiabatic combustion temperature T of the reaction ad ≥1800K. [0003] Synthesis of tungsten disilicide from elemental tungsten and silicon: <chemistry num="001"> <chem file="200410039513_cml001.xml" / > < / chemistry> , which calculates the adiabatic combustion temperature T ad =1511K. This does not satisfy the above thermodynamic criterion for th...

Claims

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Application Information

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IPC IPC(8): C01B33/06C01G41/00
Inventor 林涛郭志猛曲选辉高峰李艳崔凤娥
Owner UNIV OF SCI & TECH BEIJING