Methods of Fabricating Ceramic Materials.

Abstract

Processing parameters are described which allow the fabrication of high density 'Sialon' compositions using conventional ceramic technology amenable to low-cost large-scale production. A processing technique, 'mineralization' is used to incorporate sintering aids into the Al2O3 component of the sialon which facilitates control and minimization of the amount of such additives while simultaneously extending the firing range of the materials. Sialons containing up to 87% by weight of Si3N4 are densified by pressureless sintering in an atmosphere of N2+H2 with negligible weight loss. Properties discussed include bend strength of up to 60,000 psi at room temperature with good strength retention in several compositions to 1400 C and oxidation resistance superior to hot pressed Si3N4. The fabrication of Radome Shapes by slip casting and jiggering and of turbine blade shapes by injection molding are demonstrated. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1977
Accession Number
ADA054043

Entities

People

  • Arno Gatti
  • Michael J. Noone

Organizations

  • General Electric

Tags

Communities of Interest

  • Advanced Electronics
  • Air Platforms
  • Weapons Technologies

DTIC Thesaurus Topics

  • Body Weight
  • Ceramic Materials
  • Chemistry
  • Crystal Structure
  • Dielectric Permittivity
  • Material Degradation Processes
  • Materials
  • Materials Laboratories
  • Materials Processing
  • Materials Science
  • Materials Testing
  • Measurement
  • Mechanical Properties
  • Modulus Of Elasticity
  • Phase Diagrams
  • Solid Solutions
  • Test And Evaluation

Fields of Study

  • Materials science

Readers

  • Powder metallurgy of Titanium alloys.
  • Reinforced Composite Materials
  • Systems Analysis and Design