Surface treatment method of boron carbide powder

[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.

[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.

[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.