Lead telluride (PbTe) is a promising material for the thermoelectric power generation system using combustion heat from municipal solid waste. Because the combustion gas from solid waste incinerator generally contains corrosive substances such as HCl and H2SO4, the corrosion resistance of PbTe becomes important for its thermoelectric application. In the present study, SiO2-B2O3-Na2O-ZnO system glasses were coated on PbTe in order to improve the corrosion resistance. Addition of PbO and TeO2 to this system glass significantly improved the adhesion of the glass as well as the oxidation resistance of glass-coated PbTe. However, the addition of PbO and TeO2 degraded the corrosion resistance of the glass coating because the PbO and TeO2 reacted with HCl at high temperature to form volatile chlorides. In order to incorporate the corrosion resistance and adhesion of glass coating, a two-layer glass was coated on PbTe, in which the inner layer contains 60 mass%PbO·TeO2 while the outer layer contains no PbO·TeO2. Corrosion experiments showed that the glass coating with the graded PbO·TeO2 content exhibited excellent adhesion and corrosion resistance at an O2-HCl-Ar atmosphere.
|ジャーナル||Materials Science Forum|
|出版ステータス||Published - 1999|
|イベント||Proceedings of the 1998 5th International Symposium on Functionally Graded Materials, FGM '98 - Dresden, Ger|
継続期間: 1998 10 26 → 1998 10 29
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