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1150 |
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Tuesday, June 03, 2008, Room 05 2:20 PM Case Studies and Further Applications 2 showing the broad variety of thermal spraying in different examples, special processes and also specialised materials apart from standard coatings offer new possibilities and also new markets |
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Effects of SO2 on decay durability of the 8YZ coating having metal or cermet under coat |
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Kazuo Hamashima* / ASAHI GLASS Co., LTD. Research Center, Japan Yasunari Ishikawa / Asahi Glass Co., Ltd., Research Center, Japan |
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In the production line of glass sheets, the 8%Y2O3-ZrO2 thermal spray coatings have put into practical uses. These coatings have under layers of metal alloys or cermets, to improve their bonding strength. In forming process of glass, non-oxygenated atmosphere containing sulfur dioxide is selected continually to improve the surface condition of glass sheets. Degradation and pealing of these coating have been observed frequently due to increasing of SO2 concentration. In this study, effects of SO2 on decay durability of the 8YZ coating having under layer of the Co-Ni-Cr-Al alloy or the carbide cermet are examined. Interactions between the atmosphere and the top-layer or the under layer are clarified individually by some basic examinations and analysis. As the result, the under layer of Cr3C2 cermet is inadequate especially for these uses. |