Pt-4%Au-0.3%ZrO2의 고온 휘발 특성

Abstract

Pt and Pt alloys are used as a structural material for the fabrication of glass because it has a high strength and good volatilization properties at high temperature. Especially Pt-Au alloys, which increase a contact angle between glass and the Pt alloy, have been received a lot of attention, however, there have not been many studies related with the volatilization properties at high temperatures. In this study, volatilization properties of Pt-4%Au-0.3%ZrO2 were conducted at elevated temperature. The volatilization properties of Pt-4%Au-0.3%ZrO2 were compared with those of Pt and Pt-0.3%ZrO2. The results showed that the volatilization rate of Pt-4%Au-0.3%ZrO2 was the fastest. It was confirmed that Au was dominantly volatilized because the vapor pressure of Au was higher than Pt oxide at over 1473 K. Also, the concentration gradient of Au between surface and inside of Pt-4%Au-0.3%ZrO2 specimens was generated owing to high vapor pressure of Au at over 1473 K. At this time, Au atoms in the inside of the specimen diffuse to the surface of the specimen, and Pt atoms diffuse opposite way. However, the diffusion rate of Au atoms is higher than that of Pt atoms. Therefore, micro-pores are generated in the inside of the specimen because Pt atoms cannot fill the site where Au atoms occupy until it diffuses to the surface of the specimen.