Sintering of Si3N4 under Nitrogen Pressure

Abstract

This study showed that some Al2O3 was necessary to promote sintering of (Si3(N4) (Y2O3) materials unless hot pressing techniques were employed. The oxidation resistance of these materials improved with decreasing amounts of Al2O3 in the samples and with increasing density. The amount of Sn4O2 required to obtain high densities was less for (Si3N40 (15Y2O30 pellets heated under high N2 pressures. Sn4O2 (Si3N4) (15y2O30 pellets heated in this way showed less weight gain in air than hot pressed (Si3N40 (MgO) over an 80 hr period at 13509 C.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1979
Accession Number
ADA072515

Entities

People

  • F. S. Galasso
  • R. D. Veltri

Organizations

  • United Technologies Corporation

Tags

Communities of Interest

  • Advanced Electronics
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Artificial Intelligence
  • Body Weight
  • Ceramic Materials
  • Energy Conservation
  • Engineering
  • Engines
  • Graphitic Materials
  • Heat Engines
  • High Density
  • High Temperature
  • Hot Pressing
  • Materials
  • Materials Processing
  • Measurement
  • Oxidation Resistance
  • Particle Size
  • Transportation

Fields of Study

  • Materials science

Readers

  • Educational Psychology
  • Logistics and Supply Chain Management.
  • Thermal Physics or Thermal Science.