Journal
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
Volume 19, Issue 1, Pages 61-64Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S1003-6326(08)60229-0
Keywords
C/C-SiC composites; oxidation protective coating; slurry painting; chemical vapor deposition
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Porous carbon/carbon preforrns were infiltrated with melted silicon to form C/C-SiC composites. Three-layer Si-Mo coating prepared by slurry painting and SiC/Si-Mo multilayer coating prepared by chemical vapor deposition(CVD) alternated with slurry painting were applied on C/C-SiC composites, respectively. The oxidation of three samples at 1 500 degrees C was compared. The results show that the C/C-SiC Substrate is distorted quickly. Three-layer Si-Mo coating is out of service soon due to the fon-nation of many bubbles on surface. The mass loss of coated sample is 0.76% after 1 h oxidation. The sample with SiC/Si-Mo multilayer coating gains mass even after 105 h oxidation. SiC/Si-Mo multilayer coating can provide longtime protection for C/C-SiC composites and has excellent thermal shock resistance. This is attributed to the combination of dense SiC layer and porous Si-Mo layer. Dense SiC layer plays the dual role of physical and chemical barrier, and resists the oxidation of porous Si-Mo layer. Porous Si-Mo layer improves the thermal shock resistance of the coating.
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