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KMID : 1035320140410030171
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Korean Society for Dental Materials
2014 Volume.41 No. 3 p.171 ~ p.177
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Precipitation hardening associated with post-firing heat treatment after simulated firing of an Au-Pt-Pd metal-ceramic alloy
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Kim Sung-Min
Jeon Byung-Wook
Yu Young-Jun
Kwon Yong-Hoon
Kim Hyung-Il
Seol Hyo-Joung
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Abstract
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The precipitation hardening by post-firing heat treatment after simulated firing of an Au-Pt-Pd metal-ceramic alloy was examined by observing the change in hardness, crystal structure and microstructure. By post-firing heat treatment of a completely fired specimen at 650℃, the hardness increased rapidly within 10 minutes to the aximum value. The maximum hardness value was maintained until 40 minutes, then the hardness decreased gradually. The apparent hardening by post-firing heat treatment after simulated porcelain firing was attributed to the lattice strains which were formed by the grain interior- and grain boundary precipitates. The precipitated phase from the parent Au-rich α phase by the post-firing heat treatment after simulated firing was an AuCu3-type (Pt, Pd)3(In, Sn) phase with a lattice parameter of a220=3.9986 Å. From the above results, appropriate post-firing heat treatment in order to support the hardness of metal substructure of metal-ceramic prosthesis was expected to bring positive effects to durability of the prosthesis.
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KEYWORD
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post-firing heat treatment, Au-Pt-Pd metal-ceramic alloy, simulated porcelain firing, grain interior precipitates, precipitation hardening
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