کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1464977 | 989676 | 2010 | 5 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Thermal conductivity of porous SiC composite ceramics derived from paper precursor Thermal conductivity of porous SiC composite ceramics derived from paper precursor](/preview/png/1464977.png)
Biomorphic porous SiC composite ceramics were produced by chemical vapor infiltration and reaction (CVI-R) technique using paper precursor as template. The thermal conductivity of four samples with different composition and microstructure was investigated: (a) C-template, (b) C-SiC, (c) C-SiC–Si3N4 and (d) SiC coated with a thin layer of TiO2. The SiC–Si3N4 composite ceramic showed enhanced oxidation resistance compared to single phase SiC. However, a key property for the application of these materials at high temperatures is their thermal conductivity. The later was determined experimentally at defined temperatures in the range 293–373 K with a laser flash apparatus. It was found that the thermal conductivity of the porous ceramic composites increases in the following order: C-template < C-SiC < C-SiC–Si3N4 < SiC–TiO2. The results were interpreted in regard to the porosity and the microstructure of the ceramics.
Journal: Ceramics International - Volume 36, Issue 7, September 2010, Pages 2203–2207