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Method for preparing silicon nitride layered ceramics reinforced by silicon nitride whiskers
The invention relates to a method for preparing silicon nitride layered ceramics reinforced by silicon nitride whiskers. The method includes preparing prefabricated parts of thin layers of the silicon nitride whiskers by the aid of tape casting processes, and preparing silicon nitride matrixes in the prefabricated parts by the aid of chemical vapor infiltration technologies to obtain silicon nitride composite materials reinforced by the silicon nitride whiskers; repeatedly carrying out repeated tape casting and chemical vapor infiltration technologies on two sides of each composite material which is used as a substrate until requirements on the thicknesses of the materials are met. The method has the advantages that whiskers of the whisker prefabricated parts prepared by the aid of the tape casting processes are uniformly dispersed, and accordingly reinforcement is high in volume fraction; the preparation temperatures can be lowered by the aid of the chemical vapor infiltration technologies as compared with sintering, accordingly, damage to the reinforcement can be reduced, sintering additives can be omitted, and influence of impurity phase can be reduced; the toughness of the silicon nitride layered ceramics can be improved owing to whisker toughening and layered compound toughening; the silicon nitride layered ceramics reinforced by the silicon nitride whiskers can be prepared by the aid of the method and are excellent in dielectric properties and mechanical properties.
Method for preparing silicon nitride layered ceramics reinforced by silicon nitride whiskers
The invention relates to a method for preparing silicon nitride layered ceramics reinforced by silicon nitride whiskers. The method includes preparing prefabricated parts of thin layers of the silicon nitride whiskers by the aid of tape casting processes, and preparing silicon nitride matrixes in the prefabricated parts by the aid of chemical vapor infiltration technologies to obtain silicon nitride composite materials reinforced by the silicon nitride whiskers; repeatedly carrying out repeated tape casting and chemical vapor infiltration technologies on two sides of each composite material which is used as a substrate until requirements on the thicknesses of the materials are met. The method has the advantages that whiskers of the whisker prefabricated parts prepared by the aid of the tape casting processes are uniformly dispersed, and accordingly reinforcement is high in volume fraction; the preparation temperatures can be lowered by the aid of the chemical vapor infiltration technologies as compared with sintering, accordingly, damage to the reinforcement can be reduced, sintering additives can be omitted, and influence of impurity phase can be reduced; the toughness of the silicon nitride layered ceramics can be improved owing to whisker toughening and layered compound toughening; the silicon nitride layered ceramics reinforced by the silicon nitride whiskers can be prepared by the aid of the method and are excellent in dielectric properties and mechanical properties.
Method for preparing silicon nitride layered ceramics reinforced by silicon nitride whiskers
CHENG LAIFEI (Autor:in) / LI MINGXING (Autor:in) / ZHANG LITONG (Autor:in)
30.12.2015
Patent
Elektronische Ressource
Englisch
IPC:
C04B
Kalk
,
LIME
Silicon Carbide Whiskers Interference on Silicon Nitride Based Composite
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