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Aluminum oxide coated cubic boron nitride composite powder and preparation method thereof

A technology of cubic boron nitride and composite powder, which is applied in the field of nano-material surface coating modification and its preparation, can solve the problems of limited application of nano-cubic boron nitride, achieve good coating effect, avoid phase change, good dispersion effect

Inactive Publication Date: 2020-10-30
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no attempt to modify the surface of nano-cubic boron nitride in the prior art to solve the problem of limited application of nano-cubic boron nitride in ceramic tools

Method used

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  • Aluminum oxide coated cubic boron nitride composite powder and preparation method thereof
  • Aluminum oxide coated cubic boron nitride composite powder and preparation method thereof
  • Aluminum oxide coated cubic boron nitride composite powder and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Measure a total of 100 ml of ammonia water and ethanol solution at a volume ratio of 1:4, put the two in a beaker and mix them evenly to obtain solution A. Weigh 0.1 g of sodium lauryl sulfate powder, add it into 100 ml ethanol solution under stirring condition, make it mix uniformly, and obtain B solution. Weigh 0.2 g of cubic boron nitride powder, add it into solution B under ultrasonic and stirring conditions, and continue ultrasonic stirring for 30 min. Dissolve 0.6g of aluminum nitrate nonahydrate solid material in 10ml of distilled water, add 90ml of ethanol under stirring conditions to obtain C solution, and continue ultrasonic stirring for 5 to 10 minutes. Mix B solution and C solution under ultrasonic and stirring conditions to obtain D solution, and continue ultrasonic stirring for 10~20min. Put solution D under the condition of ultrasonic stirring, keep the temperature constant at 40°C, take solution A, slowly drop it into solution D at a rate of 2ml / min, un...

Embodiment 2

[0044] Measure a total of 100 ml of ammonia water and ethanol solution at a volume ratio of 1:4, put the two in a beaker and mix them evenly to obtain solution A. Take an appropriate amount of polyethylene glycol (PEG) and add it to the ethanol solution, ultrasonically disperse and mechanically stir for 20 minutes, so that the concentration of PEG contained in the solution is 2 g / L, and an ethanol solution containing polyethylene glycol is obtained. Weigh 0.1 g of sodium lauryl sulfate powder and 0.2 g of PEG, add them into 100 ml of ethanol solution under stirring conditions, and mix them uniformly to obtain B solution. Weigh 0.2 g of cubic boron nitride powder, add it into solution B under ultrasonic and stirring conditions, and continue ultrasonic stirring for 30 min. Dissolve 0.6g of aluminum nitrate nonahydrate solid material in 10ml of distilled water, add 90ml of ethanol under stirring conditions to obtain C solution, and continue ultrasonic stirring for 5 to 10 minutes...

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Abstract

The invention relates to aluminum oxide coated cubic boron nitride composite powder and a preparation method thereof. The preparation method comprises the following steps of: (1) mixing cubic boron nitride and ethanol according to a certain proportion, adding lauryl sodium sulfate and polyethylene glycol at a certain temperature under a stirring condition, uniformly mixing to obtain a solution, cooling the solution, centrifugally separating the solution, and washing to obtain modified nano c-BN; (2) mixing the modified nano c-BN with absolute ethyl alcohol according to a certain proportion under a stirring condition, uniformly dispersing to obtain a solution A, adding aluminum nitrate into the solution A, and uniformly mixing to obtain a solution B; and (3) slowly adding a mixed solution of ammonia water and ethanol into the solution B obtained in the step (2) until the pH value of the solution is 7-12, continuously stirring until the reaction is finished, standing and aging the obtained product, centrifugally separating the solid product, and heating and dehydrating to obtain the aluminum oxide coated cubic boron nitride composite powder. The preparation method disclosed by the invention has the characteristics of simple process and low cost, the prepared composite powder is good in dispersity, good in coating effect, high in coating rate and uniform in particle size, and thesurface characteristics of cubic boron nitride particles are improved.

Description

technical field [0001] The invention relates to a surface coating modification of a nanometer material and a preparation method thereof, in particular to a composite powder of alumina-coated cubic boron nitride and a preparation method thereof. Background technique [0002] Cubic boron nitride is a superhard material successfully developed after synthetic diamond. Because its hardness is second only to diamond, but its thermal stability and chemical inertness are far superior to diamond, it is not easy to chemically react with iron-based metals at high temperatures, not only capable of processing most difficult-to-machine materials, but also with high processing efficiency ,Good quality. [0003] In the atmospheric environment, diamond is easy to chemically react with iron and become graphitized. Therefore, diamond tools have severe chemical and mechanical wear during the cutting of iron-based metals, and it is difficult to achieve precision and ultra-precision cutting of c...

Claims

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Application Information

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IPC IPC(8): C04B35/5831C04B35/5835C04B35/628
CPCC04B35/5831C04B35/62813C04B2235/5445
Inventor 方斌李德芃袁中行
Owner QILU UNIV OF TECH
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