Sintering of Beta silicon Nitride Solid solutions Containing Metal Oxide.

Abstract

Reaction sintering of Beta-Si3N4 solid solutions was studied, using powder mixtures of Si02 and AlN; Si3N4, AlN and Al203; and Si3N4, Si02 and AlN. Although the different starting mixtures resulted in the same final composition, substantial differences in sintering kinetics take place depending on the influence of chemical reactions, vaporization, and densification by transient liquid phase sintering. This behavior can be explained qualitatively on the basis of the solid-liquid equilibria inthe Si, Al/N,O system. Reaction sintered Beta-Si3N4 solid solutions with the highest densities were prepared from mixtures of Si3N4, AlN and Al203 powders without application of external pressure or additional densification aids. In contrast, mixtures containing Si02, showed less densification even with liquid present because of vaporization during sintering. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1979
Accession Number
ADA077415

Entities

People

  • T. Y. Tien

Organizations

  • University of Michigan

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Air Force
  • Aluminum Nitrides
  • Aluminum Oxides
  • Apparent Density
  • Body Weight
  • Ceramic Materials
  • Chemical Reactions
  • Chemistry
  • Crystal Structure
  • Fluids
  • High Temperature
  • Materials
  • Measurement
  • Metal Oxides
  • Phase Diagrams
  • X Rays
  • X-Ray Diffraction

Fields of Study

  • Materials science

Readers

  • Combustion science or combustion engineering.
  • Powder metallurgy of Titanium alloys.