Journal of Dental Research, Vol 59, 1960-1965, Copyright © 1980 by International & American Associations for Dental Research Online Journals
Hardening reactions in a high-gold content ceramo-metal alloy
R. M. German
A high-gold content ceramo-metal alloy (85 wt% Au, 5 wt% Pd, 5 wt% Pt) was
selected for a definitive study of the hardening reactions. Specific points
of concern included the hardening phase, hardening mechanism, and reaction
kinetics to provide an understanding of the hardness development during the
porcelain firing cycle. Contrary to previous reports, it is shown that
ordering of a submicron FePt-type intermetallic phase is responsible for
the observed aging behavior. Hence, it is concluded that through proper
alloy design the hardening reaction can be made insensitive to variation in
porcelain firing cycles.