STUDIES ON THE FORMATION OF SIC WHISKERS FROM PULVERIZED RICE HUSK ASHES

被引：32

作者：

KRISHNARAO, RV

GODKHINDI, MM

机构：

[1] Department of Metallurgical Engineering, Indian Institute of Technology, Kharagpur

来源：

CERAMICS INTERNATIONAL | 1992年 / 18卷 / 01期

关键词：

D O I：

10.1016/0272-8842(92)90059-M

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Conversion of rice husk precursors (raw husks, pulverized black ash and mixtures of white ash and carbon black) to silicon carbide through vacuum pyrolysis. over a wide temperature range, has been studied. The products of the pyrolysis (SiC whiskers and particles) were analyzed with the help of XRD, SEM and chemical analysis. The present study indicates that a temperature range of 1250-1370-degrees-C, carbonaceous substrate, sufficient void space, controlled release of SiO vapour, and the presence of CO are favourable conditions that tend to maximize the formation of SiC whiskers. Under similar experimental conditions, the formation of SiC (w) from rice husk precursors has been observed to increase in the following order: the lowest from the pulverized black ash, intermediate from the white ash and carbon black mixtures, and the highest from the raw,rice husks.

引用

页码：35 / 42

页数：8

共 5 条

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[2]

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[3]

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[4]

Sharma, Williams, Formation and structure of silicon carbide whiskers from rice hulls, J. Am. Ceram. Soc., 67, pp. 715-720, (1984)

[5]

Krishnarao, Godkhindi, Mukunda, Chakraborty, Direct pyrolysis of raw rice husks for maximization of SiC whiskers formation, J. Am. Ceram. Soc., 74, (1991)

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