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Surface treatment method of boron carbide powder

A surface treatment, boron carbide powder technology, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve problems such as increasing costs and polluting the environment, and achieve the effects of cost saving, high powder purity, and reduced water consumption.

Active Publication Date: 2012-10-17
中国科学院上海硅酸盐研究所苏州研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that the amount of acid used is large, and a large amount of acid may remain on the surface of the powder treated by it. Afterwards, it needs to be washed repeatedly with a large amount of water to remove the residual acid. Moreover, these existing solutions also require water washing until the filtrate is about neutral , the amount of water used is larger, which will not only increase the cost in large-scale application, but also pollute the environment

Method used

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  • Surface treatment method of boron carbide powder
  • Surface treatment method of boron carbide powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Take 0.5kg of boron carbide commercial powder with an average particle size of about 0.5μm, and 3kg of deionized water, mix the two, then add nitric acid dropwise, keep stirring and test the pH value of the suspension, stop adding when the pH reaches 3 nitric acid. Under the condition of 50°C, the suspension was aged for 48h. The above mixture is filtered, and after the filtration is completed, the filtered powder is washed with deionized water, and the deionized water washing process is repeated. Finally, the pH of the filtrate was tested to be close to 5, and the washing was stopped. Dry the filtered powder at 120°C. The dried powder is ground and sieved to obtain boron carbide powder.

Embodiment 2

[0048] Take 1.5kg of boron carbide commercial powder with an average particle size of about 3.5μm, and 3kg of deionized water, mix the two, then add sulfuric acid dropwise, keep stirring and test the pH value of the suspension, wait until the pH reaches 1, stop Add sulfuric acid. Under the condition of 100° C., the suspension was aged for 1 h. The above mixture was suction filtered. After the suction filtration is completed, disperse the filtered powder in deionized water and stir evenly, then carry out suction filtration, and repeat the above process. Finally, the pH of the filtrate was tested to be 4, and the washing was stopped. Dry the filtered powder at 200°C. The dried powder is ground and sieved to obtain boron carbide powder for wet molding.

Embodiment 3

[0050] Take 5.5kg of boron carbide commercial powder with an average particle size of 7μm and 1kg of deionized water, mix the two, then add nitric acid and hydrochloric acid dropwise, stir continuously and test the pH value of the suspension, and stop when the pH reaches 2.5 join in. Under the condition of 30°C, the suspension was aged for 168h. The above mixture was suction filtered. After the suction filtration is completed, disperse the filtered powder in deionized water and stir evenly, then carry out suction filtration, and repeat the above process. Finally, the pH of the test filtrate reaches 6.0, and the washing is stopped. The filtered powder was freeze-dried. The dried powder is ground and sieved to obtain boron carbide powder for wet molding.

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Abstract

The invention relates to a surface treatment method of boron carbide powder. The surface treatment method comprises the following steps of: an acid treatment process of sufficiently mixing the boron carbide powder, water and acid, wherein the using amount of the acid is configured to enable a pH value of a mixture to be within 0.5-3; a process of aging the mixture at a ruled temperature within aging ruled time; and a process of filtering and washing obtained filter cake or powder with water until a pH (Potential of Hydrogen) value of a filtrate is 3-6.

Description

technical field [0001] The invention belongs to the field of forming inorganic materials, and in particular relates to a surface treatment method for boron carbide powder, to remove impurities on the surface of the powder, improve the dispersion stability of boron carbide powder in water, and facilitate the wet molding of boron carbide powder . Background technique [0002] The outstanding features of boron carbide ceramics are high hardness (second only to cubic boron nitride and diamond), low density (theoretical density 2.52g / cm 3 ) and a large neutron absorption cross section. These outstanding advantages make boron carbide ceramics have very important applications in wear-resistant materials, lightweight armor materials and neutron absorbing materials in the nuclear industry. [0003] In the above applications, it is usually necessary to prepare products of large size or complex shape. The outstanding feature of wet forming is that it can prepare complex-shaped ceram...

Claims

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Application Information

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IPC IPC(8): C01B31/36C01B32/991
Inventor 李晓光江东亮张景贤林庆玲陈忠明黄政仁
Owner 中国科学院上海硅酸盐研究所苏州研究院