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Zirconium boride ultrafine powder and preparation method thereof

An ultra-fine powder, zirconium boride technology, which is applied in the field of zirconium boride ultra-fine powder and its preparation, can solve the problems that limit the industrial production of zirconium boride ultra-fine powder, the uneven particle size distribution of powder particles, Powder particles are easy to agglomerate and other problems, to achieve the effect of small particle agglomeration, easy process control and low price

Inactive Publication Date: 2013-09-18
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the price of raw materials is high, the purity is low, the process is complex, difficult to control, the particle size distribution of powder particles is uneven, and the powder particles are easy to agglomerate, etc., which greatly limit the industrial production of zirconium boride ultrafine powder.

Method used

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  • Zirconium boride ultrafine powder and preparation method thereof
  • Zirconium boride ultrafine powder and preparation method thereof
  • Zirconium boride ultrafine powder and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] A zirconium boride ultrafine powder and a preparation method thereof. Mix 6~11wt% zirconia powder, 1.0~2.5wt% metal magnesium powder, 5~10wt% sodium tetraborate powder and 82~88wt% magnesium chloride powder to make a mixture, and then put the mixture into the tube In an electric furnace, raise the temperature to 1100~1200℃ at a rate of 2~4℃ / min in an argon atmosphere, keep it warm for 2~4 hours, and then soak the obtained product in hydrochloric acid with a concentration of 2.0~2.5mol / L After 3-5 hours, filter, wash with deionized water until the cleaning solution is neutral, and dry at 110°C for 10-24 hours to obtain ultrafine zirconium boride powder.

[0031] The XRD spectrum of the zirconium boride powder prepared in this embodiment is as follows figure 1 As shown, the zirconium boride powder prepared in this example has high purity, no particle agglomeration, and a particle size of 100-200 nm.

Embodiment 2

[0033] A zirconium boride ultrafine powder and a preparation method thereof. Mix 6~11wt% zirconia powder, 1.0~2.5wt% metal magnesium powder, 5~10wt% sodium tetraborate powder and 82~88wt% halide powder to make a mixture, and then put the mixture into In a tubular electric furnace, raise the temperature to 1000~1100℃ at a rate of 2~4℃ / min under argon atmosphere, keep it warm for 3~5 hours, and then put the obtained product into hydrochloric acid with a concentration of 3.0~3.5mol / L Soak for 4 to 6 hours, filter, wash with deionized water until the cleaning solution is neutral, and dry at 110°C for 10 to 24 hours to obtain ultrafine zirconium boride powder.

[0034] In this example, the halide is a mixture of 50-70wt% magnesium chloride and 30-50wt% sodium chloride; the zirconium boride powder prepared in this example has high purity, no particle agglomeration, and a particle size of 150-250nm.

Embodiment 3

[0036]A zirconium boride ultrafine powder and a preparation method thereof. Mix 5~10wt% zirconia powder, 2.5~4.0wt% metal magnesium powder, 10~15wt% sodium tetraborate powder and 76~82wt% sodium chloride powder to prepare the mixture, and then put the mixture Put it into a tubular electric furnace, raise the temperature to 1100~1200℃ at a rate of 3~5℃ / min under argon atmosphere, keep it warm for 3~5 hours, and then put the obtained product into hydrochloric acid with a concentration of 3.5~4.0mol / L Soak in the medium for 5 to 7 hours, filter, wash with deionized water until the cleaning solution is neutral, and dry at 110°C for 10 to 24 hours to obtain zirconium boride ultrafine powder.

[0037] The XRD spectrum, SEM figure and EDS figure of the zirconium boride ultrafine powder prepared in this embodiment are as follows figure 2 , image 3 with Figure 4 It can be seen that the zirconium boride powder prepared in this example has high purity, no particle agglomeration, an...

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Abstract

The invention relates to zirconium boride ultrafine powder and a preparation method thereof. The technical scheme is as follows: uniformly mixing 5-15wt% of zirconium oxide powder, 0.5-4.0wt% of metal magnesium powder, 5-20wt% of sodium tetraborate powder and 70-88wt% of halide powder to prepare a mixture; placing the mixture in an electric tube furnace; heating to 1000-1200 DEG C under an argon atmosphere at 2-8 DEG C / min and insulating for 2-6 hours; placing the product in hydrochloric acid with concentration of 2.0-4.0mol / L for 3-8 hours; filtering; washing by deionized water till the cleanout fluid is neutral; and drying for 10-24 hours at 110 DEG C to obtain zirconium boride ultrafine powder. The invention has the characteristics of low reaction temperature, low cost, simple synthetic process, easiness in process control and high yield. The zirconium boride ultrafine powder prepared is good in crystal, free from impure phases, high in activity, small in particle aggregation, uniform in distribution, high in purity and wide in industrialized prospect, and the granularity of the power is 100-500nm.

Description

technical field [0001] The invention belongs to the technical field of inorganic non-metallic material powder. Specifically relates to a zirconium boride ultrafine 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 105o, 132o, and 103o respectively. It has excellent resistance to molten metal and slag liquid erosion, and is a very promising High temperature structural materials. Due to its excellent corrosion resistance, good electrical conductivity and high hardness, it can be used as a high temperature thermocouple protection sleeve, electrode material and cutting material. It can also be added to carbon-containing refractories as an antioxidant to improve the oxidation resistance and slag resistance of the materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58C04B35/626
Inventor 张海军张少伟李发亮鲁礼林
Owner WUHAN UNIV OF SCI & TECH
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