Synthesis and oxidation behavior of (Mo0.97Nb0.03)(Si0.97Al0.03)2 ceramic. Issue 5 (1st April 2018)

• Record Type: Journal Article
• Authors: Zhu, Gaoming; Xiao, Xingliang; Wang, Xiaohong; Khan, Darvaish; Lu, Qiong; Feng, Peizhong
• Is Part Of: Ceramics international. Volume 44:Issue 5(2018)
• Page Start: 4924
• Page End: 4930
• Publication Date: 2018-04-01
• Subjects: Molybdenum disilicide -- Oxidation -- Microstructure -- X-ray diffraction -- Alloying; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2017.12.083
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: (Mo0.97 Nb0.03 )(Si0.97 Al0.03 )2 ceramic was synthesized by self-propagating high-temperature synthesis using commercial elemental powders, and then dense monolithic ceramic was prepared via vacuum hot pressing. The oxidation behavior of the bulk ceramic was investigated at 500 °C and 1200 °C. At 500 °C, due to the preferential oxidation of Nb-rich phase and the formation of uniform oxidation layer, the oxidation rate of (Mo0.97 Nb0.03 )(Si0.97 Al0.03 )2 is lower than pure MoSi2 . At 1200 °C, (Mo0.97 Nb0.03 )(Si0.97 Al0.03 )2 shows better oxidation resistance than MoSi2, owing to the uniform complex oxide layer with SiO2, Al2 O3 and Nb2 O5 formed on the surface of the prepared ceramic.