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Preparation method of hafnium carbide powder

A technology of hafnium carbide and powder, which is applied in the field of preparation of hafnium carbide powder, which can solve the problems of uneven mixing of hafnium dioxide powder and carbon black or graphite powder, low activity of carbon black or graphite powder, and hafnium dioxide Incomplete reduction 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 hafnium dioxide powder and carbon black or graphite powder are mixed unevenly and the activity of carbon black or graphite powder is low, so that the reduction of hafnium dioxide is incomplete and becomes an impurity in the product
In addition, the carbon black or graphite powder remaining in the hafnium 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 hafnium carbide powder, the lower the quality of the hafnium 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 hafnium dioxide 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 produce Raw material powder 1 with an average particle diameter 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 make an average particle size of 50μm raw material powder3.

[0025] 2. Synthesis of hafnium carbide powder:

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

Embodiment 2

[0031] 1. Raw material preparation:

[0032] Step 1: Mix 1.5 μm hafnium dioxide powder and phenolic resin in a mixing mill at a weight ratio of 5:0.75, solidify at a temperature of 90°C, and then pulverize in a powder mill to produce Raw material powder 1 with a particle size 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. Synthesis of hafnium carbide powder:

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

Embodiment 3

[0041] 1. Raw material preparation:

[0042] Step 1: Mix 3 μm hafnium dioxide powder and phenolic resin in a mixing mill at 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 Raw material powder 1 of 20 μm.

[0043] Step 2: Mix the above-mentioned raw material powder 1 and phenolic resin in a mixing mill at 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] Step 3: Mix the above-mentioned raw material powder 2 and phenolic resin in a mixing mill at a weight ratio of 5:3, solidify at a temperature of 80°C, and then pulverize in a powder mill to make a raw material with a particle size of 100 μm Powder3.

[0045] 2. Synthesis of hafnium carbide powder:

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

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Abstract

The invention provides a preparation method of hafnium carbide powder, which comprises the following steps of material preparation, mixing, curing, pulverization, compression molding, sintering, decarburization and pulverization, and is characterized in that: phenolic resin is mixed with hafnium dioxide powder with a particle size of 0.1-3 microns to form sludge; the sludge is cured at 40 DEG C-100 DEGC, and is pulverized and compressed to become a block; the block is sintered at 1300 DEG C-1800 DEG C in inert gas or reducing gas atmosphere for 6-8 hours to prepare a hafnium carbide block; and the hafnium carbide powder is obtained by decarburization and pulverization. The invention has the characteristics of simple process, high purity of the hafnium carbide powder, and low cost.

Description

technical field [0001] The invention relates to a method for preparing hafnium carbide powder, which belongs to the technical field of ceramic powder preparation. Background technique [0002] At present, hafnium carbide powder is mainly prepared by carbothermal reduction of hafnium dioxide, and the reaction equation is: [0003] HfO 2 +3C=HfC+2CO↑ [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 hafnium dioxide powder and carbon black or graphite powder are mixed unevenly and the activity of the carbon black or graphite powder is low, so that the reduction of hafnium dioxide is incomplete and becomes an impurity in the product. In addition, the carbon black or graphite powder remaining in the hafnium carbide powder has low activity, and a higher temperature (greater than 600°C) is required for decarburization to make C generate c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/30
Inventor 唐竹兴谭会会
Owner SHANDONG UNIV OF TECH
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