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Cracking of porcelain coatings bonded to metal substrates of different modulus and hardness

Published online by Cambridge University Press:  31 January 2011

Hong Zhao ,
Xiaozhi Hu ,
Mark B. Bush  and
Brian R. Lawn
Hong Zhao
Affiliation:
Department of Mechanical and Materials Engineering, The University of Western Australia, Nedlands, WA 6907, Australia
Xiaozhi Hu
Affiliation:
Department of Mechanical and Materials Engineering, The University of Western Australia, Nedlands, WA 6907, Australia
Mark B. Bush
Affiliation:
Department of Mechanical and Materials Engineering, The University of Western Australia, Nedlands, WA 6907, Australia
Brian R. Lawn
Affiliation:
Materials Science and Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899
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Abstract

A preceding study of contact damage in a bilayer system consisting of a porcelain coating on a stiff Pd-alloy substrate is here expanded to investigate the role of substrate modulus and hardness. Bilayers are made by fusing the same dental porcelain onto Co-, Pd-, and Au-alloy metal bases. Indentations are made on the porcelain surfaces using spheres of radii 2.38 and 3.98 mm. Critical loads to initiate cone fracture at the top surface of the porcelain and yield in the substrate below the contact are measured as a function of porcelain thickness. Radial cracks form at the lower surface of the coating once the substrate yield is well developed. By virtue of its controlling role in the metal yield process, substrate hardness is revealed to be a key material parameter—substrate modulus plays a secondary role. A simple elasticitybased analysis for predetermining critical loads for a given brittle/plastic bilayer system is presented.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 5 , May 2001 , pp. 1471 - 1478
Copyright
Copyright © Materials Research Society 2001

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