Premium
Internal Friction Behavior of C/SiC Composites with Environmental Barrier Coatings in Corrosive Environment
Author(s) -
Hong Zhiliang,
Cheng Laifei,
Zhang Litong,
Wang Yiguang
Publication year - 2011
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/j.1744-7402.2010.02589.x
Subject(s) - materials science , corrosion , composite material , flexural strength , composite number , aluminosilicate , chemical vapor infiltration , catalysis , biochemistry , chemistry
Internal friction (IF, Q −1 ) behavior of C/SiC composites that were coated with two kinds of environment barrier coatings, scandium disilicate (Sc 2 Si 2 O 7 ) and barium aluminosilicates (BaAl 2 Si 2 O 8 , BAS), were investigated in corrosive environments. The Sc 2 Si 2 O 7 ‐coated C/SiC composites were subjected to 50%H 2 O–50%O 2 water vapor at 1400°C and BAS‐coated C/SiC composites were exposed to molten Na 2 SO 4 coupled with 50%H 2 O–50%O 2 water vapor at 900°C. The values of Q −1 for the samples corroded at different times were recorded by means of a forced nonresonant technique. The weight loss and flexural strength as a function of corrosion time were measured. The microstructural evolution of the corroded specimens at different periods was also studied. The results indicate that the value of Q −1 of the coated C/SiC composites varies with their corrosion behaviors. The main factors that determine the IF behavior of the composites subjected to corrosion environments are the oxidation and corrosion of their fibers and interface.