FABRICATION AND CHARACTERIZATION OF HOT PRESSED Al2O3

Abstract

Hot pressing of Al2O3 with and without LiF is described, and the resultant bodies are characterized. Addition of LiF significantly enhances densification, allowing dense bodies to be obtained at about 1100C, which is 200 to 300C lower than without additives. However, the additives result in exaggerated grain growth even during hot pressing. Though the fluoride content is reduced, both during hot pressing and subsequent annealing, some fluoride remains which could be detrimental to some properties of bodies made with LiF. Some of the problems and defects of pressing are emphasized as an aid to improving the process. Particular attention is given to the analysis of H2O, CO2, and S impurities (which are probably present as chemically bounded anions) and some of their known and possible effects on microstructure and behavior in materials made with and without additives.

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Document Details

Document Type
Technical Report
Publication Date
Jul 07, 1970
Accession Number
AD0709556

Entities

People

  • Roy W. Rice

Organizations

  • United States Naval Research Laboratory

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Aluminum Oxides
  • Body Weight
  • Chemistry
  • Crystal Structure
  • Crystals
  • Forging
  • High Temperature
  • Hot Pressing
  • Hot Working
  • Manufacturing
  • Materials
  • Measurement
  • Mechanical Properties
  • Particle Size
  • Phase
  • Silicon Carbide
  • Sintering

Fields of Study

  • Materials science

Readers

  • Combustion science or combustion engineering.
  • Metallurgy
  • Thin Film Deposition Science.