Method for preparing silicon nitride ceramic with high strength, high toughness and high thermal conductivity

A technology for silicon nitride ceramics and ceramic green bodies, which is applied to high thermal conductivity silicon nitride ceramics to prepare high strength and high toughness fields. Silicon sintering, the effect of improving thermal conductivity
CN111253162AActive Publication Date: 2020-06-09浙江多面体新材料有限公司
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
浙江多面体新材料有限公司
Publication Date
2020-06-09

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Abstract

The invention relates to a method for preparing silicon nitride ceramic with high strength, high toughness and high thermal conductivity. The preparation method comprises the following steps: uniformly mixing 94-88% by mass of silicon powder and 6-12% by mass of a sintering aid, grinding, drying, adding a binder, granulating, and carrying out compression molding to obtain a ceramic biscuit, wherein the sintering aid comprises a rare earth oxide and an alkaline earth metal oxide; after the ceramic biscuit is subjected to glue discharging, nitriding at a temperature of 1380-1450 DEG C to obtaina silicon nitride ceramic billet body; and sintering the silicon nitride ceramic billet body at a temperature of 1850-1950 DEG C under air pressure to obtain the silicon nitride ceramic material.
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Description

technical field

[0001] The invention relates to a method for preparing silicon nitride ceramics with high strength, high toughness and high thermal conductivity, and belongs to the technical field of preparation of non-oxide ceramics. Background technique

[0002] Silicon nitride ceramics have excellent mechanical properties, including high flexural strength and fracture toughness, good thermal shock resistance, low high temperature creep, and good wear resistance and corrosion resistance. Used in the field of structural ceramics, such as automotive, aerospace and electronics.

[0003] The crystal structure of silicon nitride consists of strong covalent bonds, which makes it difficult to sinter the material. Therefore, liquid phase sintering is usually used to prepare dense silicon nitride ceramic materials. In recent years, due to the high theoretical thermal conductivity of silicon nitride ceramics, it has become a candidate material for heat dissipation substrates for hi...

Claims

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