Method for rapidly preparing high-performance Si3N4 ceramic ball at low cost

Abstract

The invention discloses a method for rapidly preparing a high-performance Si3N4 ceramic ball at low cost. The method comprises the following steps: (1) with Si powder as a raw material, TiO2 powder as a nitridation catalyst and an additive for improving the performance of the ceramic ball, and Al2O3-Re2O3 as an assistant, wherein Re is any one of Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, mixing and drying Si, TiO2, Al2O3 and Re2O3 at the mass fraction ratio of (56%-99.44%) to (0.22%-17.44%) to (0.17%-13.3%) to (0.17%-13.3%) to obtain Si-TiO2-Al2O3-Re2O3 mixed powder; (2) pelleting the Si-TiO2-Al2O3-Re2O3 powder through a spray drying technology, putting into a mold, and molding the ceramic ball to obtain a ceramic ball blank through a cold isostatic pressing technology; and (3) processing the Si-TiO2-Al2O3-Re2O3 ceramic ball blank by virtue of a two-step heat preservation method and carrying out gas-pressure sintering to prepare the high-performance Si3N4 ceramic ball. The method is low in cost and high in efficiency; and the performance of the Si3N4 ceramic ball can be improved.

Description

technical field

[0001] The invention relates to the field of non-oxide-based ceramic materials, and specifically discloses a low-cost, rapid preparation of high-performance Si 3 N 4 The method of ceramic ball belongs to the preparation of high performance Si 3 N 4 Innovative technology of ceramic ball method. Background technique

[0002] Si 3 N 4 Ceramics have excellent properties such as wear resistance, high temperature resistance, and high thermal conductivity, and are widely used in LED heat dissipation substrates, high-speed cutting tools, and bearing balls. Compared with steel balls used in traditional rolling bearings, silicon nitride ceramic balls have excellent properties such as low density, high temperature resistance, high rigidity, high hardness, low thermal expansion coefficient, self-lubrication, non-catastrophic damage, and non-magnetic properties. Ideal material for manufacturing high-performance rolling bearings.

[0003] Usually Si 3 N 4 Ceramic ...

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