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Preparation method of niobium carbide powder

A technology of niobium carbide and powder, which is applied in the field of preparation of niobium carbide powder, and can solve the problem of uneven mixing of niobium pentoxide powder and carbon black or graphite powder, low activity of carbon black or graphite powder, and pentoxide Incomplete niobium 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 niobium pentoxide powder is mixed unevenly with carbon black or graphite powder and the activity of carbon black or graphite powder is low, so that the reduction of niobium pentoxide is incomplete and becomes an impurity in the product
In addition, the carbon black or graphite powder remaining in the niobium 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 niobium carbide powder, the lower the quality of the niobium carbide powder

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1. Raw material preparation:

[0022] The first step: Mix the 0.1 μm niobium 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 milling machine. The raw material powder 1 having an average particle diameter of 10 μm was obtained.

[0023] The second step: the above-mentioned raw material powder 1 and the phenolic resin are mixed uniformly in a mixing mill at a weight ratio of 5:1, solidified at a temperature of 50 ° C, and then pulverized in a milling machine to make the average particle size of 20μm raw material powder 2.

[0024] The third step: the above-mentioned raw material powder 2 and the phenolic resin are uniformly mixed in a mixing mill at a weight ratio of 5:2, solidified at a temperature of 40 ° C, and then pulverized in a milling machine to make the average particle size of 50 μm raw material powder 3.

[0025] 2. Synthesis of niobium carbide powder:

[0026] The...

Embodiment 2

[0031] 1. Raw material preparation:

[0032] The first step: Mix 1.5μm niobium pentoxide powder and phenolic resin in a mixing mill at a weight ratio of 5:0.75, solidify at 90 °C, and then pulverize in a milling machine to make the product. A raw material powder 1 with a particle size of 15 μm was obtained.

[0033] The second step: the above-mentioned raw material powder 1 and the phenolic resin are mixed uniformly in a mixing mill at a weight ratio of 5:1.5, solidified at a temperature of 75 ° C, and then pulverized in a milling machine 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 the phenolic resin with a weight ratio of 5:2.5 in a mixing mill evenly, solidify at a temperature of 60 ° C, and then pulverize in a milling machine to make a raw material with a particle size of 75 μm Powder 3.

[0035] 2. Synthesis of niobium carbide powder:

[0036] The above-mentioned raw material ...

Embodiment 3

[0041] 1. Raw material preparation:

[0042] The first step: Mix 3μm niobium pentoxide 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 milling machine to make Raw material powder 1 with a particle size of 20 μm.

[0043] The second step: the above-mentioned raw material powder 1 and the phenolic resin are mixed uniformly in a mixing mill at a weight ratio of 5:2, solidified at a temperature of 100 ° C, and then pulverized in a milling machine to make raw materials with a particle size of 50 μm Powder 2.

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

[0045] 2. Synthesis of niobium carbide powder:

[0046] The above-mentioned raw material powder ...

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Abstract

The invention provides a preparation method of niobium carbide powder. The method comprises the following steps: dosing, mixing, curing, preparing powder, performing compression moulding, firing, decarbonizing and preparing the final powder. The method is characterized in that phenolic resin is mixed with 0.1-3 mu m of niobium pentoxide powder to form mud, the mud is cured at 40-100 DEG C, powder is prepared, the powder is briquetted, then the product is fired in the inert atmosphere or reducing atmosphere at 1300-1800 DEG C for 6-8 hours to prepare niobium carbide blocks, and the niobium carbide blocks are decarbonized to prepare the niobium carbide powder. The preparation method has the characteristics of simple process, high niobium carbide powder purity and low cost.

Description

technical field [0001] The invention relates to a preparation method of niobium carbide powder, and belongs to the technical field of ceramic powder preparation. Background technique [0002] At present, niobium carbide powder is mainly prepared by niobium pentoxide carbothermal reduction method, and its reaction equation is: [0003] Nb 2 O 5 +7C=2NbC+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 niobium pentoxide powder and carbon black or graphite powder are not mixed uniformly and the activity of the carbon black or graphite powder is low, so that the reduction of niobium pentoxide is incomplete and becomes an impurity of the product. In addition, the carbon black or graphite powder remaining in the niobium carbide powder has low activity. During decarburization, a higher temperature (greater than 600°C) is required t...

Claims

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Application Information

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