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Preparation method of tungsten boride powder

A technology of tungsten boride and tungsten oxide powder, applied in the direction of boron/boride, metal boride, etc., can solve the problem of uneven mixing of tungsten oxide powder and carbon black or graphite powder, low activity of carbon black or graphite powder , tungsten boride powder quality decline and other problems, to achieve the effect of low production cost, good powder sintering performance and low powder oxygen content

Inactive Publication Date: 2011-12-21
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this method is that the mixing of tungsten oxide powder and carbon black or graphite powder is uneven and the activity of carbon black or graphite powder is low, which makes the reduction of tungsten oxide incomplete and becomes an impurity in the product.
In addition, the carbon black or graphite powder remaining in the tungsten boride powder has low activity, and a higher temperature (greater than 600°C) is required for decarburization to make C generate carbon monoxide or carbon dioxide in an oxidizing atmosphere and remove it. The higher the temperature, the powder The higher the oxygen content in the body, the lower the quality of the tungsten boride powder;

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1. Raw material preparation:

[0023] The first step: tungsten oxide powder with a particle size of 0.1 μm, boron carbide powder with a particle size of 3 μm and B 2 o 3 The powders were uniformly mixed in a ratio of 70:14:3 to obtain raw material powder 1.

[0024] The second step: the above-mentioned raw material powder 1 and phenolic resin are mixed uniformly in a mixer mill at a weight ratio of 5:0.5, solidified at a temperature of 80° C., and then pulverized in a powder mill to make an average particle size of Raw material powder 2 of 10 μm.

[0025] The third step: the above-mentioned raw material powder 2 and the phenolic resin are mixed uniformly in a mixer mill at a weight ratio of 5:1, solidified at a temperature of 50° C., and then pulverized in a powder mill to form an average particle size of 20μm raw material powder3.

[0026] The fourth step: the above-mentioned raw material powder 3 and phenolic resin are mixed uniformly in a mixer mill at a weight r...

Embodiment 2

[0033] 1. Raw material preparation:

[0034] The first step: tungsten oxide powder with a particle size of 2 μm, boron carbide powder with a particle size of 7 μm and 7 μm B 2 o 3 The powders were uniformly mixed at a ratio of 75:17:4.5 to obtain raw material powder 1.

[0035] The second step: the above-mentioned raw material powder 1 and phenolic resin are mixed uniformly in a mixer with a weight ratio of 5:0.75, solidified at a temperature of 90 ° C, and then pulverized in a powder mill to make a particle size of 15 μm. Raw material powder 2.

[0036] The third step: mix the above-mentioned raw material powder 2 and phenolic resin in a mixing mill with a weight ratio of 5:1.5, solidify at a temperature of 75°C, and then pulverize in a powder mill to make a raw material with a particle size of 35 μm Powder3.

[0037] Step 4: Mix the above-mentioned raw material powder 3 and phenolic resin with a weight ratio of 5:2.5 in a mixer mill, solidify at a temperature of 60°C, an...

Embodiment 3

[0044] 1. Raw material preparation:

[0045] The first step: tungsten oxide powder with a particle size of 3 μm, boron carbide powder with a particle size of 10 μm and 10 μm B 2 o 3 The powders were uniformly mixed in a ratio of 80:20:6 to obtain raw material powder 1.

[0046] The second step: the above-mentioned raw material powder 1 and phenolic resin are mixed uniformly in a mixer mill at a weight ratio of 5:1, solidified at a temperature of 100 ° C, and then pulverized in a powder mill to form a particle size of 20 μm. Raw material powder 2.

[0047] The third step: mix the above-mentioned raw material powder 2 and phenolic resin in a mixing mill with a weight ratio of 5:2, solidify at a temperature of 100°C, and then pulverize in a powder mill to make a raw material with a particle size of 50 μm powder3.

[0048] Step 4: Mix the above-mentioned raw material powder 3 and phenolic resin in a mixing mill with a weight ratio of 5:3, solidify at a temperature of 80°C, and...

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Abstract

The invention provides a preparation method of tungsten boride powder. The method comprises the following steps: dosing, mixing, curing, milling, briquetting, firing and milling. The method is characterized in that tungsten oxide powder, boron carbide powder and B2O3 powder are mixed with phenolic resin, the mixture is cured at 40-100 DEG C to mill, the obtained powder is briquetted and then fired in 1350-2000 DEG C of argon or hydrogen atmosphere for 6-8 hours to prepare tungsten boride blocks, and the blocks are decarbonized and milled to prepare the tungsten boride powder. The method has the characteristics of simple process, high tungsten boride powder purity, good sintering performance of tungsten boride powder and low cost.

Description

technical field [0001] The invention relates to a method for preparing tungsten boride powder, which belongs to the technical field of ceramic powder preparation. Background technique [0002] Tungsten boride powder is mainly prepared by carbothermal reduction of tungsten oxide powder and carbon black or graphite powder. The reaction equation is: [0003] 3WO 3 +B 4 C+11C+B 2 o 3 = 3WB 2 +12CO↑ [0004] The above reaction process belongs to the solid-solid reaction type, and the reaction process is controlled by the diffusion of substances. The disadvantage of this method is that the mixing of tungsten oxide powder and carbon black or graphite powder is uneven and the activity of carbon black or graphite powder is low, which makes the reduction of tungsten oxide incomplete and becomes an impurity in the product. In addition, the carbon black or graphite powder remaining in the tungsten boride powder has low activity, and a higher temperature (greater than 600°C) is re...

Claims

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Application Information

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IPC IPC(8): C01B35/04
Inventor 唐竹兴谭会会
Owner SHANDONG UNIV OF TECH
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