GRAIN SIZE EFFECTS ON THE THERMAL CONDUCTIVITY OF CERAMIC OXIDES

Abstract

Dense, fine grained alumina samples were employed in a study of the effect of grain size on thermal conductivity in polycrystalline alumina. Thermal conductivity in the range 100 to 1000 C decreased slightly but significantlyAS THE AVERAGE GRAIN SIZE WAS VARIED FROM 10 TO 4 TO 2; THIS EFFECT FOLLOWED CLOSELY AN ADDITIVE RECIPROCAL VOLUME RELATIONSHIP. The role of impurities in masking this effect in dense alumina samples of purity exceeding 99% was shown. Strength and modulus of elasticity measurements were made of Al2O3 and MgO. Dense samples of MgO were produced by using hot pressing techniques.

Document Details

Document Type
Technical Report
Publication Date
Feb 01, 1961
Accession Number
AD0256233

Entities

People

  • J.r. Tinklepaugh
  • R.s. Truesdale

Organizations

  • State University of New York

Tags

DTIC Thesaurus Topics

  • Additives (Chemicals)
  • Conductivity
  • Elastic Properties
  • Grain Size
  • Hot Pressing
  • Impurities
  • Measurement
  • Mechanical Properties
  • Mechanical Working
  • Modulus Of Elasticity
  • Physical Properties
  • Polycrystals
  • Thermal Conductivity

Fields of Study

  • Materials science

Readers

  • Materials Science (Mechanical Engineering).
  • Reinforced Composite Materials
  • Spectroscopy.