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A Study on Changes of Mechanical Properties and Microstructure in Porcelain Fused to Gold Alloys by Heat Treatment

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A Study on Changes of Mechanical Properties and Microstructure in Porcelain Fused to Gold Alloys by Heat Treatment

Sang-Yong Nam, Dong-Ju Kwak, Sung-Soo Cha*

Deptartment of Dental Laboratory Technology, Daegu Health College Deptartment of Dental Laboratory Technology, Jinju Health College*

The purpose of this study was to observe the change of mechanical property and microstructure in porcelain fused to gold alloy by heat treatment. PFG alloys are composed with Au-Pd-Ag alloy of the additional elements with indium, tin and copper. Specimens were tested in hardness using vicker,s micro-hardness tester and the surface micro structural changes were analysed by SEM and EDS.

The results were as fellows:

1. The vickers hardness showed highest in Au-Pd-Ag alloy of the additional element with tin.

2. By hardening-oxiding result, the vicker,s hardness increased in additional element with tin but there was no significant difference in additional elements with indium and copper.

3. The surface oxide layer of Au-Pd-Ag alloy with added indium and tin increased but there was small change in additional element with copper.

4. The elements of indium and tin increased with increasing heat treatment in the surface alloy.

Key words : PFG alloy, mechanical property, microstructure, hardness

[Abstract]

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