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Contact damage in porcelain/Pd-alloy bilayers

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

An analysis is made of contact damage in brittle coatings on metal substrates, using a case study of a dental porcelain coating of thickness between 0.1 and 1 mm fused onto a Pd alloy base, with spherical indenter of radii 2.38 and 3.98 mm. At large coating thicknesses (>300 μm), the first damage takes the form of surface-initiated transverse cone cracks outside the contact. At small coating thicknesses (<300 μm), the first damage occurs as yield in the substrate, with attendant formation of subsurface transverse median cracks in the coating. At high loads and thin coatings, both forms of transverse cracking occur, along with subsequent delamination of the ceramic/metal interface, signalling impending failure. Conditions for avoiding such transverse cracking are considered in terms of minimum coating thicknesses and maximum sustainable contact loads. General implications concerning the design of brittle coating systems for optimum damage resistance are considered, with special reference to dental crowns.

Type
Articles
Information
Journal of Materials Research , Volume 15 , Issue 3 , March 2000 , pp. 676 - 682
Copyright
Copyright © Materials Research Society 2000

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