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

A ceramic ball and high-performance technology, applied in the field of preparing high-performance Si3N4 ceramic balls, can solve the problems of long nitriding time, harsh densification conditions, and difficult densification of Si powder, achieve uniform distribution, improve densification and performance, low cost effect

Active Publication Date: 2015-09-16
吉林长玉特陶新材料技术股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Preparation of Si by reactive pressure sintering of Si powder 3 N 4 There are two main problems in ceramics: (1) The nitriding time of Si powder is long, and it needs to be kept at 1400°C for 8 hours; (2) Si powder 3 N 4 Densification is difficult, the densification conditions are too harsh, the sintering temperature is high (1900°C), and the holding time is long (12h)

Method used

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

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The preparation of high-performance Si provided by the present invention 3 N 4 The method of ceramic ball, comprises the steps:

[0032] (1) Using Si powder as raw material, TiO 2 -Al 2 o 3 -Re 2 o 3 As an auxiliary agent, where Re=Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu any one, according to Si: TiO 2 :Al 2 o 3 :Re 2 o 3 The mass fraction ratio is 56-99.44%: 0.22-17.44%: 0.17-13.3%: 0.17-13.3%. After mixing and drying, Si-TiO 2 -Al 2 o 3 -Re 2 o 3 mixed powder;

[0033] (2) Si-TiO mixed uniformly 2 -Al 2 o 3 -Re 2 o 3 The powder is granulated by a spray drying process, and then the granulated powder is put into a mold for ceramic ball molding, and finally a ceramic ball green body with a certain density and strength is obtained by a cold isostatic pressing process;

[0034] (3) Si-TiO 2 -Al 2 o 3 -Re 2 o 3 The ceramic ball green body adopts a two-step heat preservation method and uses air pressure sintering to prepare...

Embodiment 2

[0042] In the present embodiment, Re=Y, specific preparation high-performance Si 3 N 4 The ceramic ball method is as follows:

[0043] According to the Si powder mass fraction of 83.61%, TiO 2 Powder mass fraction is 4.02%, Al 2 o 3 Mass fraction is 3.09%, Y 2 o 3 The powder mass fraction is 9.28% to carry out batching, prepare Si according to the method of embodiment 1 3 N 4 ceramic balls. The relative density of the prepared ceramic material is greater than 99%, the hardness of the material is 18GPa, and the fracture toughness is 8MPa·m 1 / 2 , The bending strength is 1100Mpa.

Embodiment 3

[0045] In this embodiment, Re=Lu, specific preparation of high-performance Si 3 N 4 The ceramic ball method is as follows:

[0046] According to Si powder mass fraction of 85.1%, TiO 2 Powder mass fraction is 4.5%, Al 2 o 3 Mass fraction is 5.5%, Lu 2 o 3 Powder mass fraction is 4.9% and carries out batching, prepares Si according to the method for embodiment 1 3 N 4 ceramics. The relative density of the prepared ceramic material is higher than 99%, the hardness of the material is 18.5GPa, and the fracture toughness is 8.5MPa·m 1 / 2 , The bending strength is 1000Mpa.

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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 ...

Claims

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Application Information

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IPC IPC(8): C04B35/596C04B35/63
Inventor 郭伟明吴利翔林华泰
Owner 吉林长玉特陶新材料技术股份有限公司
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