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원상연 ( Sang Yeon Won ),김동기 ( Dong Ki Kim ),현승균 ( Soong Keun Hyun ),김목순 ( Mok Soon Kim ),박재성 ( Je Sung Park ),양승호 ( Seung Ho Yang ),윤원규 ( Won Kyu Yoon ) 대한금속재료학회(구 대한금속학회) 2015 대한금속·재료학회지 Vol.53 No.5
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.
통전가압소결법에 의한 Ti-45Al-1.6Mn 금속간화합물의 제조
양승호,김목순,현승균 대한금속재료학회(대한금속학회) 1999 대한금속·재료학회지 Vol.37 No.10
Ti-45at%Al-1.6at%Mn intermetallic compounds were fabricated from elemental powder mixtures by the reactive sintering method using an Electro-Pressure Sintering(EPS) equipment. Effects of heating rate, holding temperature/time and cooling rate on microstructure and densification were studied. When EPS process was carried out by a high heating rate of 100℃/min, exudation of molten Al from an elemental powder mixture was observed. Such an exudation was found to be preventable by the pre-diffusion treatment below Al melting temperature or EPS process with a low heating rate of 5℃/min. When mold temperature twas held to 1100℃, porosity decreased with increasing in holding time, and a dense titanium aluminide having the porosity below 1% could be obtained at and above the holding time of 30min. Cooling rate during EPS process affected microstructure of sintered material, and a fully homogenized titanium aluminide having a fine lamellar structure was achieved when the cooling rate was lower than 50℃/min after holding at 1250℃ for 120min.