Title of article :
A Si–SiC oxidation protective coating for carbon/carbon composites prepared by a two-step pack cementation
Author/Authors :
Fu Qian-Gang، نويسنده , , Li He-Jun، نويسنده , , Wang Yong-Jie، نويسنده , , Li Ke-Zhi، نويسنده , , Wu Heng، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2009
Pages :
5
From page :
2525
To page :
2529
Abstract :
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.
Keywords :
D. Carbon , D. SiC , Oxidation
Journal title :
Ceramics International
Serial Year :
2009
Journal title :
Ceramics International
Record number :
1271792
Link To Document :
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