Journal of Materials Science

, Volume 17, Issue 9, pp 2693–2699 | Cite as

Discussion of the indentation hardness of a glass-ceramic with participate microstructure

  • N. Miyata
  • H. Jinno
Article

Abstract

On the basis of a theory previously developed by the authors for the indentation hardness of glass matrix, particulate composites, an attempt was made to interpret published hardness data for a ZnO-Al2O3-SiO2 glass-ceramic in which gahnite (ZnAl2O4) crystal particles are dispersed in a glass matrix as a major crystalline phase. The elastic moduli for gahnite were estimated using both the bulk modulus-molar volume relationship and the density-Poisson's ratio relationship, established for oxide crystals. After determining the variation of the matrix Young's modulus with heat-treatment, the variation of the overall hardness with volume fraction of crystal phase as well as the crystal-size effect were discussed. The hardness behaviour of the present glass-ceramic could be interpreted well in terms of the properties and amounts of the constituent phases and the microstructural effects.

Keywords

Elastic Modulus Crystalline Phase Crystal Phase Particulate Composite Glass Matrix 

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Copyright information

© Chapman and Hall Ltd 1982

Authors and Affiliations

  • N. Miyata
    • 1
  • H. Jinno
    • 1
  1. 1.Department of Industrial Chemistry, Faculty of EngineeringKyoto UniversityKyotoJapan

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