Ceramic Eutectics

Abstract

Metal oxide ingots with fine grain size can be fabricated by growth from the melt. An oriented lamellar-type microstructure free of cracks is developed in the Al2O3/ZrO2 eutectic system by controlled solidification with the gradient furnace. The colonies inherent in ingots grown by a modified Bridgman technique have been eliminated and also a lamellar-type rather than a rod-type microstructure is produced in ingots grown with the gradient furnace. Cracking does not occur at the eutectic grain boundaries as it does for polycrystalline aggregates of Al2O3, MgAl2O4, or Y3Al5O12 solidified from the melt.

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1972
Accession Number
AD0741812

Entities

People

  • Dennis J. Viechnicki
  • Frederick Schmid

Organizations

  • United States Army Research Laboratory

Tags

Communities of Interest

  • Advanced Electronics
  • Air Platforms

DTIC Thesaurus Topics

  • Aluminum Oxides
  • Chemistry
  • Diameters
  • Eutectics
  • Grain Boundaries
  • Grain Size
  • Heat Energy
  • Materials
  • Metal Oxides
  • Metals
  • Microstructure
  • New York
  • Oxides
  • Temperature Gradients
  • Transverse
  • Unidirectional
  • United States

Fields of Study

  • Materials science

Readers

  • Materials Science and Engineering.
  • Powder metallurgy of Titanium alloys.