Method for fabricating of fine-grained alumina abrasive by sol-gel and impregnation methods

摘要

fine grains present invention relates to a manufacturing method of an alumina abrasive and, more particularly, After the prepared boehmite sol as a starting material a porous boehmite gel prepared, Y nitrate and Sr dissolved nitrate in distilled water in each of distilled water, and the mixing ratio of Sr nitrate and Y nitrate 9: 1 to 1: 9 weight ratio to impregnated the porous gel in the impregnating solution in the mixture of from 5 to 40% by weight of the bed, and SrAl 1.0 ~ 2.0 the alumina sintered base ₁₂ O ₁₉ second phase relates to a process for the production of fine abrasive grains of alumina, characterized in that a homogeneous distribution. According to the invention, the sol-gel process alumina production and Y nitrate by nitrate and Sr in the mixed solution for forming the secondary phase of the needle also by precipitation of SrAl ₁₂ O ₁₉ 2 phase can be produced alumina abrasive material is homogeneously distributed in a dense microstructure, in addition to having extremely high hardness improved hardness by rapid sintering at a relatively low temperature as compared to the sintered body made of a common sintering temperature increase speed Ultrafine can be produced alumina abrasive material. ;