A Dispersion Method for Precisely Controlling the Aspect Ratio of Alumina Whiskers

Abstract

The invention provides a dispersing method capable of accurately regulating and controlling slenderness ratios of alumina whiskers. The dispersing method comprises the following step: dispersing the alumina whiskers in a dispersing agent by adopting a cooperative dispersing method implemented by ultrasonic waves, blade agitation and big ball low-speed ball milling, wherein the dispersing agent comprises a first dispersing agent and a second dispersing agent; the first dispersing agent is polyethylene glycol; the second dispersing agent is 2-amino-2-methyl-1-propanol or polyacrylic acid; the mass ratio of the first dispersing agent to the second dispersing agent is (1 to 3) to (0.1 to 3). Compared with the prior art, the dispersing method has the advantages that a steric-hindrance effect and an electric double layer theory are brought into full consideration, a non-ionic dispersing agent and an anionic dispersing agent prepared from specific components are used in a combination way, and the cooperative dispersing method implemented by the ultrasonic waves, the blade agitation and the big ball low-speed ball milling is adopted on the basis of reasonably controlling the proportion of the two dispersing agents, so that a good dispersing effect of the alumina whiskers of different slenderness ratios is achieved.

Description

technical field [0001] The invention relates to the technical field of alumina whiskers, in particular to a dispersion method for precisely controlling the aspect ratio of alumina whiskers. Background technique [0002] Alumina whiskers have the characteristics of high strength, high elastic modulus, no high temperature oxidation, and good compatibility with ceramic matrix materials. Therefore, it has broad application prospects in the reinforcement and toughening of composite materials in the fields of consumer electronics, biomedicine, and advanced equipment. [0003] The methods for strengthening and toughening composite materials through alumina whiskers mainly include in-situ growth and direct introduction of whiskers. In situ growth of whiskers (Li J, Li W, Nai X, Bian S, Liu X, Wei M. Synthesis and formation of aluminum whiskers from hydrothermal solution. JMater Sci2010; 45(1): 177-81.), first using water Aluminum ammonium carbonate (AACH) whiskers were synthesized...

AI Technical Summary

Problems solved by technology

However, in the method of directly introducing whiskers into the matrix, the uniform dispersion of alumina whiskers and the regulation of aspect ratio are difficult problems in this process, which directly affect the molding and sintering of composite materials, and then affect the final performance of products

[0004] The existing technology cannot fully disperse the alumina whiskers in the agglomerated state, and can only disperse the whiskers well by reducing the amount of whiskers used or suppressing the whisker aspect ratio, otherwise the alumina whiskers will be mixed with the matrix. Due to the poor sintering performance of composite materials, the product density cannot be improved, which ultimately affects its various performance parameters

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