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Preparation method of tantalum carbide powder

A tantalum carbide and powder technology is applied in the field of preparation of tantalum carbide powder, which can solve the problem of uneven mixing of tantalum oxide powder and carbon black or graphite powder, low activity of carbon black or graphite powder, and tantalum carbide powder. Quality degradation and other problems, to achieve the effect of good powder application performance, low production cost and uniform grain size

Inactive Publication Date: 2013-02-13
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the mixing of tantalum 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 tantalum oxide incomplete and becomes an impurity in the product.
In addition, the carbon black or graphite powder remaining in the tantalum carbide 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. The higher the temperature, the powder The higher the oxygen content in the tantalum carbide powder, the lower the quality of the tantalum carbide powder

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1. Raw material preparation:

[0022] Step 1: Mix 0.1 μm tantalum oxide powder and phenolic resin in a mixer with a weight ratio of 5:0.5, solidify at a temperature of 80°C, and then pulverize in a powder mill to form an average Raw material powder 1 with a particle size of 10 μm.

[0023] 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 50 ° C, and then pulverized in a powder mill to make an average particle size of 20μm raw material powder 2.

[0024] The third step: the above-mentioned raw material powder 2 and phenolic resin are mixed uniformly in a mixer mill at a ratio of 5:2 by weight, solidified at a temperature of 40° C., and then pulverized in a powder mill to form an average particle size of 50μm raw material powder3.

[0025] 2. Tantalum carbide powder synthesis:

[0026] The above-mentioned raw material powder 3 was compacted under a...

Embodiment 2

[0031] 1. Raw material preparation:

[0032] Step 1: Mix tantalum oxide powder of 1.5 μm and phenolic resin in a weight ratio of 5:0.75 in a mixer mill, solidify at a temperature of 90°C, and then pulverize in a powder mill to make a particle size Raw material powder 1 of 15 μm.

[0033] The second step: mix the above-mentioned raw material powder 1 and phenolic resin with a weight ratio of 5:1.5 in a mixer mill, 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 Powder 2.

[0034] The third step: mix the above-mentioned raw material powder 2 and phenolic resin in a mixing mill with a weight ratio of 5:2.5, solidify at a temperature of 60°C, and then pulverize in a powder mill to make a raw material with a particle size of 75 μm Powder3.

[0035] 2. Tantalum carbide powder synthesis:

[0036] The above-mentioned raw material powder 3 was compacted under a pressure of 1.5 MPa, and then fired in an in...

Embodiment 3

[0041] 1. Raw material preparation:

[0042] The first step: Mix 3 μm tantalum oxide powder and phenolic resin in a mixer with a weight ratio of 5:1, solidify at a temperature of 100°C, and then pulverize in a powder mill to make a particle size of Raw material powder 1 of 20 μm.

[0043] The second step: mix the above-mentioned raw material powder 1 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 Powder 2.

[0044] The third step: the above raw material powder 2 and phenolic resin are mixed uniformly in a mixer with a weight ratio of 5:3, solidified at a temperature of 80 ° C, and then pulverized in a powder mill to make a raw material with a particle size of 100 μm Powder3.

[0045] 2. Tantalum carbide powder synthesis:

[0046] The above-mentioned raw material powder 3 was compacted under a pressure of 3 MPa, and then fired in an i...

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Abstract

The invention provides a preparation method of a tantalum carbide powder. The method comprises steps of burdening, mixing, solidifying, pulverizing, compacting and moulding, sintering, decarburizing and pulverizing, and is characterized by mixing phenolic resins and a tantalum oxide powder with a granularity of 0.1-3[mu]m into pug, solidifying at 40 DEG C to 100 DEG C, pulverizing, and compacting into a block; then sintering at 1300 DEG C-2000 DEG C under an inertia or a reducing atmosphere for 6-8 h to obtain a tantalum carbide block; and decarburizing and crushing to obtain a tantalum carbide powder. The invention has the characteristics of simple technology, high-purity tantalum carbide powder and low costs.

Description

technical field [0001] The invention relates to a method for preparing tantalum carbide powder, which belongs to the technical field of ceramic powder preparation. Background technique [0002] At present, tantalum carbide powder is mainly prepared by carbothermal reduction of tantalum oxide, and the reaction equation is: [0003] Ta 2 o 5 +7C=2TaC+5CO↑ [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 tantalum oxide powder and carbon black or graphite powder is uneven and the activity of carbon black or graphite powder is low, so that the reduction of tantalum oxide is incomplete and becomes an impurity in the product. In addition, the carbon black or graphite powder remaining in the tantalum carbide powder has low activity, and a higher temperature (greater than 600°C) is required for decarburization to make C generate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/30C04B35/56
Inventor 唐竹兴张鹤
Owner SHANDONG UNIV OF TECH
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