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Patent Searching and Data


Title:
SILICON CARBIDE-BASE CERAMIC COMPOSITE MATERIAL AND ITS PRODUCT
Document Type and Number:
Japanese Patent JP2000264741
Kind Code:
A
Abstract:

To obtain a composite material having enhanced mechanical properties such as thermal shock resistance, breaking strength, hardness, elastic modulus and machinability by sintering silicon carbide power surface-coated with t-BN in such a way that a specified vol.% of h-BN is uniformly dispersed in the grain boundaries or grains of a formed silicon carbide matrix.

Urea and boric acid as sources of BN are dissolved in a solvent and intimately mixed with clean SiC powder, the solvent is removed by drying and reduction treatment is carried out under heating in a reducing atmosphere to form a t-BN(turbulent layer structure BN) coating. A sintering aid is optionally added to the SiC powder surface-coated with a fine h-BN precursor and they are mixed, dried and sintered. The h-BN precursor is converted into h-BN and 5-50 vol.% fine h-BN particles having ≤400 nm average particle diameter are uniformly dispersed in the grain boundaries of a formed SiC matrix or in the grain boundaries and grains to inhibit the grain growth of SiC in sintering.


Inventors:
NIIHARA KOICHI
KUSUSE HISAFUMI
KAWASE TAKESHI
Application Number:
JP7097699A
Publication Date:
September 26, 2000
Filing Date:
March 16, 1999
Export Citation:
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Assignee:
JAPAN SCIENCE & TECH CORP
International Classes:
C04B35/565; B82B1/00; C04B35/626; (IPC1-7): C04B35/626; C04B35/565
Attorney, Agent or Firm:
Yoshiyuki Nishi