کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1460813 | 989610 | 2015 | 8 صفحه PDF | دانلود رایگان |
Thermolysis of as-cast polyorganoborosilazane resulted in the formation of porous monolith of Si–B–C–N ceramic. However the addition of varying amounts of Metroxylon sagu (30–60 wt%) to polyorganoborosilazane, on thermolysis, resulted in Si–B–C–N foams. Thermo-gravimetric analysis of M. sagu revealed complete decomposition at 850 °C. Spark plasma sintering of Si–B–C–N was carried out at 1600 °C at a pressure of 30 MPa for 5 min in vacuum to obtain highly dense compacts. The obtained Si–B–C–N foam was found to be amorphous while the SPS-processed samples were observed to be highly crystalline. The geometrical density of the foam was found to vary from 0.4 to 0.25 g/cm3 with increase in sago content along with the presence of both closed and open cells. The thermal conductivity of the foam and SPS-processed samples showed varying trends with increasing temperature due to the amorphous and crystalline nature of the samplesrespectively.
Journal: Ceramics International - Volume 41, Issue 1, Part B, January 2015, Pages 1163–1170