Carbon Impurity Effect on the Thermal Degradation of a Si3N4-Y2O3 ceramic

Abstract

The oxidation behavior of hot-pressed Si3N4.Y2O3 compounds (principally Si3Y2O3N4, N-melilite) was studied in air between 700 C and 1440 C. It is shown that carbon impurity strongly influences the thermal degradation of these compounds. Oxidation of carbon-containing materials in air at 1000 C leads to high weight gains, severe cracking, and complete destruction of the samples. Nominally carbon-free materials show good oxidation resistance without cracking.

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1979
Accession Number
ADA075138

Entities

People

  • George E. Gazza
  • Heinrich Knoch

Organizations

  • United States Army Research Laboratory

Tags

Communities of Interest

  • Advanced Electronics
  • Space
  • Weapons Technologies

DTIC Thesaurus Topics

  • Air Force
  • Body Weight
  • Carbides
  • Ceramic Materials
  • Chemical Analysis
  • Chemical Compounds
  • Graphitic Materials
  • Heat Treatment
  • Materials
  • Materials Laboratories
  • Materials Science
  • Military Research
  • New York
  • Oxidation
  • Oxidation Resistance
  • Silicon Carbide
  • United States

Fields of Study

  • Materials science

Readers

  • Powder metallurgy of Titanium alloys.