Contact Damage Resistance and Strength Degradation of Glass-Infiltrated Alumina and Spinel Ceramics

Published

January 26, 1998

Author(s)

Yeon-Gil G. Jung, I M. Peterson, Antonia Pajares, Brian R. Lawn

Abstract

Hertzian indentation testing with hard spheres is used to evaluate the effect of preform microstructure on the mechanical properties of glass-infiltrated alumina and spinel InCeram ceramics. Performs with different grain morphologies and porosities are investigated. Indentation stress-strain curves measured on the fully infiltrated materials reveal a marked insensitivity in load bearing capacity to the starting preform state. The glass phase is shown to play a vital role in providing mechanical rigidity and strength to the ceramic structures. All the infiltrated ceramics show subsurface cone fracture and quasi-plastic deformation above critical loads PC (cracking) and PY (yield), depending on sphere radius, with PY

Citation

Journal of Dental Research

Volume

77

Issue

3

Pub Type

Journals

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Keywords

alumina, cracking, deformation, dental ceramics, Herzian contact, microstructure, spinel, strength

Citation

Jung, Y. , Peterson, I. , Pajares, A. and Lawn, B. (1998), Contact Damage Resistance and Strength Degradation of Glass-Infiltrated Alumina and Spinel Ceramics, Journal of Dental Research, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=850002 (Accessed October 15, 2025)