A zirconium boride-silicon carbide composite powder and its preparation method

A technology of composite powder and silicon carbide, which is applied in the direction of carbon compounds, chemical instruments and methods, boron/boride, etc., can solve the limitations of industrial production of zirconium boride-zirconium carbide composite powder, reaction process, product structure and The performance is not easy to control, the powder particle size distribution is not uniform, etc., to achieve the prospect of large-scale industrial production, small particle agglomeration, and the effect of easy control of the process

Active Publication Date: 2015-09-16
泰州市海通资产管理有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method has low production cost, large output and cheap and easy-to-obtain raw materials, the process is complicated, the product particle size is coarse and the product purity is low.
Spark plasma sintering (SPS) is a new material preparation technology that has received much attention in recent years. Compared with traditional research techniques, spark plasma sintering can prepare ZrB at a lower temperature and in a shorter time. 2 -SiC composite material, but high production cost
Although the process of self-propagating high-temperature synthesis method is simple, the reaction speed is fast and the energy consumption is low, but because the reaction speed is too fast, usually the reaction cannot be completely carried out, resulting in more impurities, and the reaction process, product structure and performance are not good. Easy to control, unable to obtain high-purity ZrB 2 -SiC powder
[0005] At present, the preparation technology of zirconium boride-zirconium carbide composite powder has certain deficiencies: high cost, low purity of synthetic powder, complex process, difficult to control, uneven particle size distribution of powder particles, powder particles Easy to agglomerate, etc., which greatly limits the industrial production of zirconium boride-zirconium carbide composite powder

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A zirconium boride-silicon carbide composite powder and a preparation method thereof. Mix 6-9wt% of zircon powder, 6-9wt% of metal magnesium powder, 5-8wt% of sodium tetraborate powder, 0.6-0.9wt% of carbon powder and 75-81wt% of magnesium chloride powder to prepare Mixed powder; then put the mixed powder into a tubular electric furnace, raise the temperature to 1100-1200°C at a rate of 2-4°C / min under an argon atmosphere, and keep it warm for 2-4 hours; then put the obtained product into a concentration of Soak in 2.0-2.5mol / L hydrochloric acid for 3-5 hours, filter, wash the filtered product with deionized water, wash until there is no precipitation in the cleaning solution, detect with silver nitrate, and dry at 110°C for 10-24 hours , to obtain zirconium boride-silicon carbide composite powder.

[0029] The zirconium boride-silicon carbide composite powder prepared in this example has high purity, no particle agglomeration, and a particle size of 3-5 μm.

Embodiment 2

[0031] A zirconium boride-silicon carbide composite powder and a preparation method thereof. Mix 6-9wt% zircon powder, 6-9wt% metal magnesium powder, 5-8wt% sodium tetraborate powder, 0.6-0.9wt% carbon powder and 75-81wt% halide powder to prepare The mixed powder is obtained; then the mixed powder is placed in a tubular electric furnace, and the temperature is raised to 1100-1250°C at a rate of 2-4°C / min under an argon atmosphere, and the temperature is kept for 3-5 hours; then the obtained product is put into a concentration Soak in 3.0-3.5mol / L hydrochloric acid for 4-6 hours, filter, wash the filtered product with deionized water, wash until no precipitation is detected by silver nitrate in the cleaning solution, and dry at 110°C for 10-24 hours, the zirconium boride-silicon carbide composite powder is obtained.

[0032] In this example, the halide is a mixture of 50-70wt% magnesium chloride and 30-50wt% sodium fluoride; the zirconium boride-silicon carbide composite powde...

Embodiment 3

[0034] A zirconium boride-silicon carbide composite powder and a preparation method thereof. Mix 1-4wt% zircon powder, 4-6wt% metal magnesium powder, 7-10wt% sodium tetraborate powder, 0.4-0.6wt% carbon powder and 80-86wt% magnesium chloride powder to prepare Mixed powder; then put the mixed powder into a tube electric furnace, raise the temperature to 1100-1200°C at a rate of 3-5°C / min under an argon atmosphere, and keep it warm for 3-5 hours; then put the obtained product into a concentration of Soak in 3.5-4.0mol / L hydrochloric acid for 5-7 hours, filter, wash the filtered product with deionized water, wash until there is no precipitation in the cleaning solution, detect with silver nitrate, and dry at 110°C for 10-24 hours , to obtain zirconium boride-silicon carbide composite powder.

[0035] The zirconium boride-silicon carbide composite powder prepared in this example has high purity, no particle agglomeration, and a particle size of 5-7 μm.

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Abstract

The invention relates to zirconium boride-silicon carbide composite powder and a preparation method thereof. According to the technical scheme, the preparation method comprises the following steps of mixing 1-9 wt % of zircon powder, 1-9 wt % of metal magnesium powder, 2-10 wt % of sodium tetraborate powder, 0.1-0.9 wt % of carbon powder and 75-91 wt % of halide powder, then putting the mixed powder in an electric tube furnace, heating to 1100-1300 at the rate of 2-8 DEG C / min in an argon atmosphere, and carrying out heat preservation for 2 to 6 hours; then putting an obtained product in hydrochloric acid with the concentration of 2.0-4.0mol / L so as to be soaked for 3 to 8 hours, filtering, washing the filtered product with deionized water till cleaning fluid does not generate precipitates by detection with silver nitrate, and drying to obtain the zirconium boride-silicon carbide composite powder. The preparation method has the characteristics of low reaction temperature, low cost, simple process, easy process control, high yield and good industrial production prospect. The prepared zirconium boride-silicon carbide composite powder has the advantages of good crystallization, small particle size, uniform distribution, no impurity phase, high purity, high activity and small particle aggregation.

Description

technical field [0001] The invention belongs to the technical field of inorganic non-metallic material powder. Specifically relates to a zirconium boride-silicon carbide composite powder and a preparation method thereof. Background technique [0002] ZrB 2 It has a high melting point (3040°C), low thermal expansion coefficient, excellent thermal and electrical conductivity, and ZrB 2 It is non-wetting with metal melt, and the wetting angles with Fe liquid, Cu liquid and Al liquid are 105°, 132° and 103° respectively. It has excellent resistance to molten metal and slag liquid erosion, and is a very effective Promising high-temperature structural materials. But ZrB 2 The lack of sintering difficulty, poor high temperature oxidation resistance and poor toughness greatly limit the ZrB 2 Applications. Introduction of SiC to ZrB 2 Formation of ZrB in 2 -SiC composite material, not only can effectively improve ZrB 2 Antioxidant properties, but also improve the ZrB 2 Mech...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C01B35/04C01B31/36C01B32/963
Inventor张海军张少伟李发亮孔德成鲁礼林
Owner泰州市海通资产管理有限公司