Environmental effects on degradation behavior in YbGdSi ternary system at elevated temperatures. Issue 13 (1st July 2021)

• Record Type: Journal Article
• Authors: Arai, Yutaro; Morigayama, Hiroki; Aoki, Takuya; Inoue, Ryo
• Is Part Of: Ceramics international. Volume 47:Issue 13(2021)
• Page Start: 18783
• Page End: 18791
• Publication Date: 2021-07-01
• Subjects: Yb-silicide -- Steam environment -- Gadrinium -- Calculation phase diagram -- High temperature degradation; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2021.03.213
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: The degradation behavior of Yb- and Gd-based ternary silicides (YbGdSi) was evaluated in Ar, 50 vol%air-H2 O (air-H2 O), and 100 vol%H2 O (steam) environment and compared with the results obtained in a previous study conducted in air environment. Heat exposure at 1200 °C for 1, 2, 4, and 8 h was carried out in addition to thermogravimetric analysis up to 1200 °C. The results of these studies demonstrated that YbGdSi formed complex oxides in the (Yb- and/or Gd)-Si-O system and Yb2 O3 was commonly formed for each environment. In addition, the resultant weight gain for YbGdSi in air, air-H2 O and steam decreases by 2–5% in comparison with it for Yb3 Si5 . These results clearly indicate that the addition of Gd was effective in preventing the degradation of Yb-silicides.