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Title: Silicon nitride having a high tensile strength

A silicon nitride ceramic comprising: a) inclusions no greater than 25 microns in length, b) agglomerates no greater than 20 microns in diameter, and c) a surface finish of less than about 8 microinches, said ceramic having a four-point flexural strength of at least about 900 MPa.
Inventors:
 [1];  [2];  [3];  [3];  [4];  [5];  [6];  [7]
  1. (Northboro, MA)
  2. (Medfield, MA)
  3. (Oxford, MA)
  4. (Millbury, MA)
  5. (Grafton, MA)
  6. (Sterling, MA)
  7. (Oakham, MA)
Issue Date:
OSTI Identifier:
870675
Assignee:
Saint-Gobain/Norton Industrial Ceramics Corporation (Worcester, MA) ORNL
Patent Number(s):
US 5571760
Contract Number:
AC05-84OR21400
Research Org:
LOCKHEED MARTIN ENRGY SYST INC
Country of Publication:
United States
Language:
English
Subject:
silicon; nitride; tensile; strength; ceramic; comprising; inclusions; 25; microns; length; agglomerates; 20; diameter; surface; finish; microinches; four-point; flexural; 900; mpa; surface finish; ceramic comprising; silicon nitride; tensile strength; nitride ceramic; flexural strength; /501/