High Temperature Mechanical Properties of Polyphase Ceramics Based on Silicon Nitride.

Abstract

Progress is summarized in the following study areas: (1) eutectic studies in the Si3N4-MgO-SiO2 system relating eutectic compositions and temperatures to fabrication, microstructure and mechanical properties; (2) evidence for high temperature cavitation crack growth in polyphase Si3N4 materials; (3) estimates of the time required for the stress induced penetration of a liquid from triple points to locations between grains; (4) the reaction of Fe with polyphase Si3N4 to form surface pits during oxidation which lead to strength degradation, (5) creep behavior of polyphase Si3N4/MgO alloys in relation to the MgO/SiO2 molar ratio and cavitation. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1978
Accession Number
ADA054342

Entities

People

  • F. F. Lange

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Air Force
  • Ceramic Materials
  • Chemistry
  • Composite Materials
  • Crystal Structure
  • Diffusion Coefficient
  • Grain Boundaries
  • Low Temperature
  • Material Degradation Processes
  • Materials
  • Materials Science
  • Measurement
  • Mechanical Properties
  • Mechanics
  • Metals
  • Oxidation
  • Silicon Carbide

Fields of Study

  • Materials science

Readers

  • Materials Science and Engineering.