Synthesis and characterization of monolithic CVD-SiC tubes. Issue 8 (July 2016)

• Record Type: Journal Article
• Authors: Drieux, Patxi; Chollon, Georges; Jacques, Sylvain; Couégnat, Guillaume; Jouannigot, Stéphane; Weisbecker, Patrick
• Is Part Of: Journal of the European Ceramic Society. Volume 36:Issue 8(2016:)
• Page Start: 1873
• Page End: 1883
• Publication Date: 2016-07
• Subjects: Chemical vapor deposition -- Silicon carbide -- Ceramic tubes -- Microstructurel -- Mechanical properties; 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.2016.02.024
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: The high open porosity of SiC/SiC composites is problematic for uses in advanced thermal or confinement systems. A strong and gas-tight SiC sheath would helpfully complete the composite structure. The aim of this work was to prepare and characterize long, free standing and high strength SiC tubes obtained through a rapid near net shape manufacturing process. The tubes were produced by continuous chemical vapor deposition (CVD) at atmospheric pressure using CH3 SiHCl2 /C3 H6 /H2 mixtures. The composition, morphology and microstructure of the CVD-SiC tubes were analyzed in details. The Si/C ratio and crystalline state through wall thickness are related to the progress of gas phase reactions during continuous deposition. The silicon excess in the CVD-SiC coating can be reduced by preheating gases and adding C3 H6 . C-ring specimens cut from the tubes were submitted to compressive tests at room and high temperature to assess their failure properties and thermomechanical behavior.