Research on Aluminum Nitride Materials.

Abstract

This report summarizes the progress made during the second year of AFOSR contract support in growing single crystals and producing ceramic samples of aluminum nitride for use as electronic heat sinks and surface acoustic wave (SAW) devices. An improved aluminum pellet-drop technique for making 70-g quantities of ALN starting material has been developed. By subliming and recondensing this material in sealed tungsten crucibles at temperatures between 2100 C and 2350 C, crystals up to 1.2 cm in length and 0.4 cm in diameter have been grown. The problem of pinhole attack of tungsten by ALN has been studied in detail, and a technique for producing long-lived crucibles using W foil has been developed.

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1978
Accession Number
ADA054980

Entities

People

  • Glen A. Slack
  • Thomas F. Mcnelly

Organizations

  • General Electric

Tags

Communities of Interest

  • Advanced Electronics
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Absorption Coefficients
  • Acoustic Waves
  • Air Force
  • Alloys
  • Aluminum Nitrides
  • Ceramic Materials
  • Chemical Vapor Deposition
  • Crystal Growth
  • Crystal Structure
  • Crystals
  • Energy
  • Grain Boundaries
  • High Temperature
  • Materials
  • Radio Frequency Power
  • Surface Acoustic Waves
  • Thermal Conductivity

Fields of Study

  • Physics

Readers

  • Electrical Engineering
  • Materials Science and Engineering.

Technology Areas

  • Microelectronics