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- Title
Effect of ice-quenching on the change in hardness of a Pd-Au-Zn alloy during porcelain firing simulation.
- Authors
Hye-Jeong SHIN; Min-Jung KIM; Hyung-Il KIM; Yong Hoon KWON; Hyo-Joung SEOL
- Abstract
This study examined the effect of ice-quenching after degassing on the change in hardness of a Pd-Au-Zn alloy during porcelain firing simulations. By ice-quenching after degassing, the specimens were softened due to homogenization without the need for an additional softening heat treatment. The lowered hardness by ice-quenching after degassing was recovered greatly from the first stage of porcelain firing process by controlling the cooling rate. The increase in hardness during cooling after porcelain firing was attributed to the precipitation of the f.c.t. PdZn phase containing Au, which caused severe lattice strain in the interphase boundary between the precipitates and matrix of the f.c.c. structure. The final hardness was slightly higher in the ice-quenched specimen than in the specimen cooled at stage 0 (the most effective cooling rate for alloy hardening) after degassing. This was attributed to the more active grain interior precipitation during cooling in the ice-quenched specimen after degassing.
- Subjects
METAL quenching; DEOXIDIZING of metals; HARDENABILITY of metals; DEGASSING of metals; PRECIPITATION (Chemistry); FACE centered cubic structure
- Publication
Dental Materials Journal, 2017, Vol 36, Issue 2, p142
- ISSN
0287-4547
- Publication type
Article
- DOI
10.4012/dmj.2016-279