کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1464865 | 989673 | 2006 | 5 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Yttrium silicate oxidation protective coating for SiC coated carbon/carbon composites Yttrium silicate oxidation protective coating for SiC coated carbon/carbon composites](/preview/png/1464865.png)
Four kinds of yttrium silicate oxidation protective coatings SiO2·Y2O3, 1.5SiO2·Y2O3, 1.5SiO2·Y2O3/SiO2·Y2O3 and 2SiO2·Y2O3/1.5SiO2·Y2O3/SiO2·Y2O3 were prepared by plasma spray on the surface of SiC pre-coated carbon/carbon composites. The structures of the coatings were characterized by XRD, SEM and EDS analyses. It was shown that the gradied 2SiO2·Y2O3/1.5SiO2·Y2O3/SiO2·Y2O3 multi-layer coating had better high-temperature oxidation resistance. It could protect carbon/carbon composites from oxidation at 1773 K in air for 73 h with a weight loss of less than 2%. The oxidation activation energy of the coated carbon/carbon composites is 87.3 kJ/mol, and the oxidation process in C/C substrates with a multi-layer coating was controlled by the rate of oxygen diffusion through the holes in the coating.
Journal: Ceramics International - Volume 32, Issue 4, 2006, Pages 417–421