Germanate Glass Ceramic.

Abstract

A germanate glass ceramic article which has better thermal and physical properties than the competing materials of zinc sulfide, spinel, and sapphire is made by mixing germanate ceramic glass components; melting the components to form a molten mass; cooling the molten mass to form a solid glass article; nucleating the solid article by heating it in the range of about 630-790 deg C for about 1-16 hours to develop nuclei in the article; and crystallizing the nucleated article by heating it, after nucleation, in the range of about 1/2 minute to about 8 hours to grow the nuclei to crystallites having an average diameter of less then about 1000 nanometer (nm); and cooling to form the glass ceramic. (MM)

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Document Details

Document Type
Technical Report
Publication Date
Dec 23, 1994
Accession Number
ADD017418

Entities

People

  • Barry B. Harbison
  • Ishwar Aggarwal
  • John M. Jewell

Organizations

  • United States Department of the Navy

Tags

DTIC Thesaurus Topics

  • Ceramic Materials
  • Crystal Growth
  • Crystallization
  • Crystals
  • Erosion Resistance
  • Glass Transition Temperature
  • Heat Treatment
  • Materials
  • Oxides
  • Patent Applications
  • Phase Separation
  • Physical Properties
  • Resistance
  • Thermal Shock
  • Toughness
  • Transition Temperature
  • Wear Resistance

Readers

  • Combustion and Flow Dynamics.
  • Materials Science and Engineering.
  • Thin Film Deposition Science.