Patent · US Expired

Silicon nitride sintered body and process for preparation thereof

US5114889A · kind A · utility

6Cited by
9References
9Claims
0Family size

Assignee

Inventors

Key dates

Filing dateNov 27, 1990
Grant dateMay 19, 1992
Priority date
Expiry dateNov 27, 2010

Classification

  • Technology area (CPC C)Chemistry; Metallurgy
  • CPC primaryC04B35/593
  • WIPO fieldMaterials, metallurgy
  • WIPO sectorChemistry

Abstract

Disclosed is a silicon nitride sintered body comprising 70 to 99 mole % of silicon nitride, 0.1 to 5 moles % of a rare earth element oxide and up to 25 moles % of silicon oxide and having a silicon oxide-to-rare earth element oxide molar ratio of from 2 to 25, wherein silicon nitride crystal grains have a fine acicular structure having an average particle major axis of up to 7 .mu.m and an average aspect ratio of at least 3.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.