Abstract
Two Au-based bonding agents have been applied as an intermediate layer between a Pd-alloy substrate and a ceramic coating. Firing of one bonding agent (Britecote) created a fairly even and dense coating with Sn, Ga and Cu in the uppermost layer. The application of the other bonding agent (Inzoma) caused an uneven coating with a rough surface, covering the substrate only partially. A transition zone due to diffusion of Au and Pd was detected using both bonding agents. A high bond strength to the ceramic was observed by means of 4-point bend tests. The Britecote coating was shown to reduce the development of porosity in the opaque ceramic and alloy/ceramic interface for a Pd-alloy with 0.019% C, but not in another Pd-alloy with 0.070% C which caused devastating porosity in the ceramic. A tendency to reduced dimensional changes in a semi-circular arch subsequent to ceramic firing were found by the application of a bonding agent on one of the alloys.
Published Version
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