Method for rapidly preparing high heat conduction Si3N4 ceramic with low cost

A high thermal conductivity and low cost technology, applied in the field of low cost and rapid preparation of high thermal conductivity Si3N4 ceramics, can solve the problems of long Si powder nitriding time, long holding time, high nitrogen pressure, and achieve rapid preparation, improved densification, low The effect of cost preparation
CN104163633AInactive Publication Date: 2014-11-26GUANGDONG UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
GUANGDONG UNIV OF TECH
Publication Date
2014-11-26
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a method for rapidly preparing high heat conduction Si3N4 ceramic with low cost. The method is characterized in that Si powder is taken as a raw material, ZrO2 powder is taken as a nitridation catalyst, ZrO2-MgO-Re2O3 is taken as a sintering aid, wherein Re2O3 is taken as a rare earth oxide, Si, ZrO2 and MgO-Re2O3 are mixed according to mass fraction and then dried to obtain a Si-ZrO2-MgO-Re2O3 mixing powder; the mixing powder is subjected to a two-step insulation method and a pressureless sintering process to obtain the high heat conduction Si3N4 ceramic; According to the ceramic material, the relative density is higher than 95%, hardness is 8-20 GPa, fracture toughness is 3-8MPa.m<1 / 2>, bending strength is 200-1000Mpa, and the thermal conductivity is 20-100W.m<-1>,K<-1>. By introducing a ZrO2 catalyst, Si powder nitridation IS accelerated, the introduction of ZrO2-MgO-Re2O3 can improve the densification of Si3N4, and the high heat conduction Si3N4 ceramic can be rapidly prepared with low cost.
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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 thermal conductivity Si 3 N 4 ceramic 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 key engine parts. Usually Si 3 N 4 Ceramics with high purity Si 3 N 4 The powder is prepared by hot pressing and sintering as raw material, the cost is high, and samples with complex shapes cannot be prepared.

[0003] In order to reduce costs and prepare complex shapes, Si powder was used as raw material to prepare Si by reactive pressure sintering. 3 N 4 ceramics. On the one hand, the powder preparation and ceramic densification are combined into one step, which significantly reduces the cost; on the other hand, throug...

Claims

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