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A kind of preparation method and application of high-quality coarse grain WC powder

A coarse-grained, high-quality technology, applied in the direction of tungsten/molybdenum carbides, carbides, etc., it can solve the problems of general particle size uniformity, difficult to meet production needs, poor grain development consistency, etc., and achieve good particle size distribution. , the effect of reducing the preparation cost and excellent overall performance of the alloy

Active Publication Date: 2020-07-31
ZHUZHOU SANXIN HARD ALLOY PRODN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the doped Na salt or Li salt often cannot and WO 3 To achieve complete uniform mixing, the W powder obtained by using it usually has defects such as poor consistency of grain development, average particle size uniformity, and serious grain agglomeration.
At the same time, a certain amount of Na will remain in the W powder obtained by this process + or Li + , which will lead to the fragmentation of W powder during the carbonization process
Therefore, this process can often obtain relatively coarse WC powder, but most of them are polycrystalline agglomerated particles, and the powder has a finer grinding particle size. Production needs

Method used

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  • A kind of preparation method and application of high-quality coarse grain WC powder
  • A kind of preparation method and application of high-quality coarse grain WC powder
  • A kind of preparation method and application of high-quality coarse grain WC powder

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preparation example Construction

[0032] The preparation method of the high-quality coarse-grained WC powder of the present invention comprises the following steps:

[0033] S1. Put WO 2 powder in N 2 +H 2 A reduction is carried out in a mixed atmosphere to obtain coarse-grained WO 3 powder particles; in pure H 2 Carry out secondary reduction in the atmosphere to prepare coarse-grained W powder, and the FSSS particle size of W powder is 12-16 μm;

[0034] S2. The coarse-grained tungsten powder obtained in step S1 is subjected to a pre-mixing process, C black is added for mixing to prepare carbon, and then pressed, and the WC material is obtained by carbonizing at a high temperature of 1900-2300 °C;

[0035] S3. The WC material is crushed and sieved, and the measured FSSS particle size is 13-17 μm, and the FSSS particle size is 5.5-7.0 μm, and the high-quality coarse-grained WC powder with oxygen content of 0.01%-0.02% is ground; wherein, the N in step S1 2 +H 2 N in mixed atmosphere 2 with H 2 The volu...

Embodiment 1

[0037] The preparation method of the high-quality coarse-grained WC powder of the present embodiment comprises the following steps:

[0038] S1. Put WO 3 powder in N 2 +H 2 In a mixed atmosphere, N 2 :H 2 The volume ratio is 1:1, and a reduction is carried out in a tubular reduction furnace. The reduction temperature is 960 °C, and the N 2 +H2 The flow rate of the mixed atmosphere is 15m 3 / h, the loading capacity of the boat is 8kg, and the thrust speed is 40min / boat; the coarse-grained WO is obtained 3 Powder particles; the resulting coarse-grained WO 3 The powder particles are sieved twice, the first time is 80 mesh, and the second time is 120 mesh. The resulting product is WO 3 , FSSS particle size is about 16μm.

[0039] The WO obtained by the one-time reduction 3 batch, in pure H 2 The secondary reduction was carried out under the atmosphere. Reduction temperature 970℃, H 2 The flow rate of the atmosphere is 10m 3 / h, dew point: -60℃, loading capacity 6kg, ...

Embodiment 2

[0044] The preparation method of the high-quality coarse-grained WC powder of the present embodiment comprises the following steps:

[0045] S1. Put WO 2 The powder is placed in a mixed atmosphere of N2+H2, N2 2 :H 2 The volume ratio is 1:2, and a reduction is carried out in a tubular reduction furnace at a reduction temperature of 980 °C, N 2 +H 2 The flow rate of the mixed atmosphere is 12m 3 / h, the loading capacity of the boat is 6kg, and the pushing speed is 35min / boat; the coarse-grained WO is obtained 3 Powder particles; the resulting coarse-grained WO 3 The powder particles are sieved twice, the first time is 80 mesh, and the second time is 120 mesh. The resulting product is WO 3 , FSSS particle size is about 14.5μm;

[0046] The WO obtained by the one-time reduction 3 batch, in pure H 2 The secondary reduction was carried out under the atmosphere. Reduction temperature 1000℃, H 2 The flow rate of the atmosphere is 12m 3 / h, dew point: -60℃, loading capaci...

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Abstract

The invention discloses a preparation method and application of high-quality crude grain WC powder. Primary reduction is performed on WO3 powder with N2+H2 mixed atmosphere, so that the flow of H2 isrelatively reduced, the reduction process is slowed favorably, and WO3 powder grains with coarser grain are obtained. Secondary reduction is performed at higher reduction temperature, and pure H2 is taken as reducing atmosphere, so that the reduction rate of WO3 is improved favorably, the chemical purity of W powder is improved favorably, and crystals of the W powder can grow more intactly; and reduction is performed by the sieved and blended WO3, so that the uniformity of the grain size of the W powder can be obviously improved. A W powder premixing process is adopted, so that the degree of aggregation of less W grains is benefited, and the dispersibility of the W powder is higher, and therefore, the W powder and C black can be mixed more uniformly; a W+C mixture compacting process is adopted, so that the diffusion distance of the W grains and C grains can be effectively reduced, and the carbonization efficiency of the W powder is improved; and a high temperature carbonization processis adopted, so that the WC grains with good crystallization can be obtained, and the plasticity of crystals can be obviously improved.

Description

technical field [0001] The invention relates to the field of preparation methods of cemented carbide, and more particularly, to a preparation method and application of high-quality coarse-grained WC powder. Background technique [0002] In recent years, with the continuous expansion of the application field of cemented carbide, cemented carbide materials have developed in two directions: ultra-coarse and ultra-fine, and ultra-coarse cemented carbide has been widely used in mining rock drilling tools, rolls and stamping dies. . [0003] Carbide has high hardness, strength, wear resistance and corrosion resistance, known as "industrial teeth", widely used in military industry, aerospace, machining, metallurgy, oil drilling, mining tools, electronic communications, construction and other fields. With the continuous improvement of the industrial level, people have put forward higher requirements for the performance of cemented carbide. As the main raw material of cemented car...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/949
CPCC01P2004/03C01P2004/61
Inventor 张可夫
Owner ZHUZHOU SANXIN HARD ALLOY PRODN CO LTD
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