|
KMID : 1035320140410020139
|
|
Korean Society for Dental Materials
2014 Volume.41 No. 2 p.139 ~ p.144
|
|
|
The effect of cooling rate and firing stage on the hardness and microstructure of the firing simulated Au-Pt-Pd metal-ceramic alloy
|
|
Kim Sung-Min
Jeon Byung-Wook
Kwon Yong-Hoon
Kim Hyung-Il
Seol Hyo-Joung
|
|
|
Abstract
|
|
|
|
The effect of cooling rate and firing stage on the hardness and microstructure of the firing simulated Au-Pt-Pd metal-ceramic alloy was investigated by means of hardness test, field emission scanning electron microscopic observations, X-ray diffraction analysis. The effective cooling rate for hardening of alloy during simulated porcelain firing was quick cooling and stage 0, and the hardening effect became weak as the cooling rate became slower than stage 0. The hardness of the firing simulated specimen until final glazing stage was slightly lower than that of only glazing treated specimen. Thus, repetitive firing decreased the hardness of the Au-Pt-Pd metal-ceramic alloy. By oxidation treatment which is the first firing stage, the formation of fine grain interior precipitates was observed, which resulted in apparent hardening by severe lattice distortion. By repetitive firing or by reducing the cooling speed, the grain interior precipitates became coarse, which resulted in softening of the Au-Pt-Pd metal-ceramic alloy.
|
|
|
KEYWORD
|
|
|
cooling rate, Au-Pt-Pd metal-ceramic alloy, simulated porcelain firing cycle, grain interior precipitates, hardening
|
|
|
FullTexts / Linksout information
|
|
|
|
|
Listed journal information
|
|
|