کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1465259 | 989684 | 2009 | 5 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: A Si–SiC oxidation protective coating for carbon/carbon composites prepared by a two-step pack cementation A Si–SiC oxidation protective coating for carbon/carbon composites prepared by a two-step pack cementation](/preview/png/1465259.png)
To prevent carbon/carbon (C/C) composites from oxidation, a Si–SiC coating has been prepared by a two-step pack cementation technique. X-ray diffraction (XRD) and scanning electron microscopy (SEM) analysis show that the coating obtained by the first step pack cementation is a porous β-SiC structure, and a dense structure consisting α-SiC, β-SiC and Si is obtained after heat-treatment by the second step pack cementation. By energy dispersive spectroscopy (EDS) analysis, a gradient C–SiC transition layer can be formed at the C/C-coating interface. The as-received coating has excellent oxidation protection ability and can protect C/C composites from oxidation for 166 h at 1773 K in air. The weigh loss of the coated C/C is due to the formation of bubble holes on the coating surface and through-coating cracks in the coating.
Journal: Ceramics International - Volume 35, Issue 6, August 2009, Pages 2525–2529