SiC/MoSi2 based coatings for Cf/C composites by two step pack cementation. Issue 1 (January 2019)

• Record Type: Journal Article
• Authors: Bezzi, Federica; Burgio, Federica; Fabbri, Paride; Grilli, Selene; Magnani, Giuseppe; Salernitano, Elena; Scafè, Matteo
• Is Part Of: Journal of the European Ceramic Society. Volume 39:Issue 1(2019)
• Page Start: 79
• Page End: 84
• Publication Date: 2019-01
• Subjects: Pack cementation coating -- SiC -- MoSi2 -- Oxidation -- Carbon-Carbon composites; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2018.01.024
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: In order to improve the oxidation resistance of Cf /Cs produced by chemical vapour infiltration, a multilayer coating based on silicon carbide and molybdenum disilicide was produced by two-step pack cementation technique. The inner SiC layer with a thickness up to 25 μm was obtained without promoted reaction additives by varying the composition, and thermal treatment conditions. The SiC/SiC-MoSi2 coating was produced with a thickness up to 80 μm by two step pack cementation, considering the effect of the inner layer characteristic. The enhancement of the oxidation resistance, observed in SiC/SiC-MoSi2 coated Cf /Cs by means of thermal analysis in flowing air up to 1500 °C, was due to the formation of SiO2 promoted by the passive oxidation of silicon carbide and molybdenum disilicide.