Characterization of microstructure and oxidation resistance of Y modified silicide composite coating on Mo–Cr–W–Al–Ti substrate. Issue 7 (1st April 2022)

• Record Type: Journal Article
• Authors: Yi, Zhiqiang; Tan, Dunqiang; Tang, Ye; Wen, Haiqiang; Xiong, Weilong
• Is Part Of: Ceramics international. Volume 48:Issue 7(2022)
• Page Start: 9848
• Page End: 9857
• Publication Date: 2022-04-01
• Subjects: Mo-Cr-W-Al-Ti substrate -- Y2O3 -- Silicide coating -- Oxidation resistance; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2021.12.187
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Y modified silicide composite coating (Si–Y coating) was prepared on Mo–Cr–W–Al–Ti substrate by Si and Y2 O3 co-deposition at 1200 °C for 20 h. The oxidation resistance of the coating was studied by analyzing the phase constituents and microstructure. A double layer coating has been observed: a thick outer layer consisting of (Mo, X)Si2, (Cr, X)Si2 and Al2 O3, and a thin inner layer of (Mo, X)5 Si3, (Cr, X)5 Si3, Al2 O3 . The Si–Y coating possessed better oxidation resistance under high temperature conditions than the unmodified one, the mass gain of 5.97 mg/cm 2 after 18 cycles of oxidation at 1300 °C in air for 150 h for the former and the beginning of weight loss after 18 h under the same condition for the latter. The dispersed Y2 Ti2 O7 contained in the compact SiO2 protective layer acts as a "skeleton" to improve the oxidation resistance of the Si–Y coating.