CHEMICAL STRENGTHENING OF Al2O3.

Abstract

Surface layers were chemically formed on sapphire and 99+% polycrystalline alumina specimens by annealing the samples while enveloped in various oxide powders. Quantitative observations were made by measuring the change in strength between the chemically treated specimens and those which were not chemically treated. The polycrystalline specimens were treated with Cr2O3, Co(x)O(y), Nb2O5, Fe2O3 or Cr2O3 + CrCl3. All treatments with the exception of Fe2O3 and Nb2O5 resulted in significant strength increases. Sapphire exhibited considerable strength increases when treated with Cr2O3 or Cr2O3 + CrCl3. (Author)

Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1969
Accession Number
AD0708707

Entities

People

  • John T. Frasier
  • John T. Jones

Organizations

  • Iowa State University

Tags

DTIC Thesaurus Topics

  • Acquisition
  • Annealing
  • Chemical Compounds
  • Crystal Structure
  • Data Acquisition
  • Gems (Minerals)
  • Observation
  • Polycrystals
  • Sapphire

Fields of Study

  • Materials science

Readers

  • Combustion science or combustion engineering.
  • Mechanical Engineering/Mechanics of Materials.
  • Trauma Surgery or Emergency Medicine.