کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1558631 | 999318 | 2007 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Novel thermal gradient chemical vapor infiltration process for carbon-carbon composites
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
شیمی مواد
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Novel thermal gradient chemical vapor infiltration process for carbon-carbon composites Novel thermal gradient chemical vapor infiltration process for carbon-carbon composites](/preview/png/1558631.png)
چکیده انگلیسی
Solid cylindrical carbon-carbon composites were processed using conventional thermal gradient chemical vapor infiltration. High thermal conductivity (55 W/m·°C) carbon fibers (48 k) were inserted in the center of a cylindrical low thermal conductivity (0.15 W/m·°C) needle punched carbon felt preform, to create a thermal gradient because of the difference in thermal conductivities. The hottest portion (900-1200 °C) was along the inserted carbon fibers, where the pyrolytic reaction of natural gas occurred. The densification radially moved outwards and ultimately a density of 1.778 g/cm3 was obtained after 67 h. The process parameters such as the electric power of the furnace, electrical resistance of the sample, densification time, and the position of the deposition layer were studied. A densified sample having a volume fraction of carbon fibers of 10% was tested for ablation and erosion. The microstructure of the pyrolytic carbon matrix of the as-prepared sample was investigated by polarized light microscopy and scanning electron microscopy.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: New Carbon Materials - Volume 22, Issue 3, September 2007, Pages 247-252
Journal: New Carbon Materials - Volume 22, Issue 3, September 2007, Pages 247-252
نویسندگان
Shameel Farhan, Ke-zhi LI, Ling-jun GUO,