Oxidation behavior of SiC ceramics synthesized from processed cellulosic bio-precursor

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• 作者：Anwesha Maity^a ; Dipul Kalita^b ; Nijhuma Kayal^a ; Tridip Goswami^b ; Omprakash Chakrabarti^a ; ^{omprakash@cgcri.res.in} ; Paruchuri Gangadhar Rao^b
• 关键词：D. Mechanical property ; Processed bio-precursor ; SiC ceramic ; Oxidation behavior
• 刊名：Ceramics International
• 出版年：2012
• 期刊代码：13_02728842
• 类别：ms
• 出版时间：August, 2012
• 卷：38
• 期：6
• 页码：4701-4706
• 文件大小：521 K

摘要

Oxidation behavior of Si/SiC ceramic composite synthesized from processed cellulosic bio-precursor was studied in dry air over the temperature range 1200-1350 掳C. The material was synthesized from processed bio-precursors (bleached bamboo kraft pulp in the form of flat board of bulk density 0.58 g cm^鈭?) and had a bulk density of 2.66 g cm^鈭?, porosity of 0.6 vol%and contents of Si and SiC phases of 39.1%and 60.3%(v/v) respectively. The process of oxidation could be described closely by a parabolic oxidation equation. An activation energy of 141.4 kJ/mol was obtained. Both the SiC and Si phases oxidized and the oxidation was mainly controlled by the transport of molecular oxygen through the growing oxide layer. Pre-oxidation at 1300 掳C for 24 h in ambient air increased the strength of Si/SiC ceramics by around 46%because of the healing of the surface defects created during surface preparation by the oxide layer.