Effect of Sintering Temperature on the Celsian/Yttrium Silicate Oxidation Resistant Coatings for C/SiC Composite

Abstract:

A novel celsian/yttrium silicate coating was deposited on carbon fiber reinforced silicon carbide matrix (C/SiC) composite, using BaO-Al₂O₃-SiO₂ (BAS) glass andY₂O₃ powder as starting materials. The effects of sintering temperatures on microstructure and performance of coatings were studied. The results show that the final phases of sintered coatings are composed of celsian, yttrium silicate and remnant glass. The coating are dense, crack-free and pore-free in macroscopic scales when sintered at temperatures above 1400°C. The crystal grains in the coating grow too large, and the coating is loose in microstructure when sintered at temperatures higher than 1450°C. The coated samples sintered at 1450°C for 30min, which have the densest morphology and microstructure, have the lowest weight loss of 0.13 % after oxidation at 1500°C for 90 min.

• Periodical: Advanced Materials Research (Volumes 1033-1034)
• Pages: 882-886
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1033-1034.882
• Online since: October 2014
• Authors: Xiao Hui Zheng*, Chun Yu Wang, Song Tao Ding, Chi Yong Liang
• Keywords: Celsian, In Situ Formation, Oxidation Resistant Coating, Sintering Temperature, Yttrium Silicate

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