Calculation of Ceramic Phase Diagrams

Abstract

A data base is being developed for calculation of quasibinary and quasiternary phase diagrams of oxide and oxynitride ceramic systems. The current base covers combinations of Cr2O3, MgO, Al2O3, Fe2O3, Fe3O4, FeO, CaO, SiO2, Si3N4 and AlN. Lattice Stability, Solution and Compound Phase Parameters were derived covering the liquid, spinel, periclase, corundum alpha and beta quartz, crystobalite, tridymite and beta Si3N4 structures in all of the quasibinary systems composed of the data base compounds. Evaluation of these parameters permit calculation of the thermochemical properties of these systems in good agreement with limited thermochemical data. In addition, isothermal quasiternary systems of selected oxide and oxynitride systems composed of data base compounds have also been calculated over a wide range of temperature. The free energy of formation of beta sialons in the Si3N4-Al2O3-AlN system and the X phase in the SiO2-Al2O3-Si3N4 system have been calculated.

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Document Details

Document Type
Technical Report
Publication Date
Nov 30, 1979
Accession Number
ADA080218

Entities

People

  • Larry Kaufman

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Air Force
  • Ceramic Materials
  • Chemistry
  • Crystal Structure
  • High Temperature
  • Materials
  • Materials Engineering
  • Materials Laboratories
  • Materials Processing
  • Materials Science
  • Metallurgy
  • Phase Diagrams
  • Plastic Explosives
  • Silicon Carbide
  • Solar Cells
  • Solid Solutions
  • Thermodynamics

Fields of Study

  • Physics

Readers

  • Combustion science or combustion engineering.
  • Materials Science and Engineering.
  • Powder metallurgy of Titanium alloys.