Sintered Si3N4 for High Performance Thermomechanical Applications

Abstract

The gas pressure sintering (GPS) process for dense (> 99%) Si3N4 containing approx. 7 wt% BeSiN2 and 7 wt% SiO2 as sintering aids was scaled-up to develop a property data base for use in thermomechanical applications at high (approx. 1300 deg C) temperatures. The fracture strength in 3-pt bend for test bars approx. 0.6 cm x 0.6 cm x 4.5 cm long was approx. 440 MNm-2 (63,700 psi) for a span length of 3.8 cm. There was little drop (< 15%) in high temperature strength at 1400 deg C in air. The creep resistance was outstanding at 1300 to 1400 deg C, as evidenced by creep rates of approx. 4 x .00001/h for a stress of 207 MPa (30,000 psi) at 1400 C.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1982
Accession Number
ADA116121

Entities

People

  • C. D. Greskovich
  • W. D. Pasco

Organizations

  • General Electric

Tags

Communities of Interest

  • Energy and Power Technologies
  • Weapons Technologies

DTIC Thesaurus Topics

  • Air Force
  • Body Weight
  • Ceramic Materials
  • Chemical Reactions
  • Chemical Synthesis
  • Chemistry
  • Databases
  • Engineering
  • Equations
  • Heat Treatment
  • Materials
  • Materials Processing
  • Materials Science
  • Measurement
  • Mechanical Properties
  • Mechanics
  • New York

Fields of Study

  • Materials science

Readers

  • Mathematics or Statistics
  • Powder metallurgy of Titanium alloys.
  • Thin Film Deposition Science.

Technology Areas

  • Space