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Preparation method of vanadium carbide powder

A technology of vanadium carbide and powder, which is applied in the field of preparation of vanadium carbide powder, and can solve the problem of uneven mixing of vanadium pentoxide powder and carbon black or graphite powder, low activity of carbon black or graphite powder, and pentoxide Incomplete vanadium 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 vanadium pentoxide 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 vanadium pentoxide is incomplete and becomes an impurity in the product
In addition, the carbon black or graphite powder remaining in the vanadium 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 vanadium carbide powder, the lower the quality of the vanadium 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 vanadium pentoxide powder and phenolic resin in a mixing mill at a weight ratio of 5:0.5, solidify at a temperature of 80°C, and then pulverize in a powder making machine. 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 form an average particle size of 50μm raw material powder3.

[0025] 2. Synthesis of vanadium carbide powder:

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

Embodiment 2

[0031] 1. Raw material preparation:

[0032] Step 1: Mix vanadium pentoxide 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 it in a powder mill 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 vanadium carbide powder:

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

Embodiment 3

[0041] 1. Raw material preparation:

[0042] The first step: Mix 3 μm vanadium pentoxide 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 produce Raw material powder 1 with a particle size 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 vanadium 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 reduci...

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Abstract

The invention provides a preparation method of vanadium carbide powder, which includes the following steps of preparing, mixing, solidifying, milling, pressing and shaping, sintering, decarburizing and milling and is characterized by mixing phenolic resin and vanadium pentoxide powder with particle size of 0.1-3 mu m to form a mud material, solidifying at the temperature of 40-100 DEG C, milling, pressing into blocks, then sintering at the temperature of 1300-1550 DEG C in an inert atmosphere or a reducing atmosphere for 6-8 hours to obtain vanadium carbide blocks, decarburizing and pulverizing to obtain the vanadium carbide powder. The preparation method provided by the invention has the characteristics of simple process, high purity of vanadium carbide powder and low cost.

Description

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

Claims

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Application Information

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