The nitridation kinetics of pyrolyzed rice husk

被引:29
作者
Liou, TH [1 ]
Chang, FW [1 ]
机构
[1] NATL CENT UNIV,DEPT CHEM ENGN,CHUNGLI 32054,TAIWAN
关键词
D O I
10.1021/ie950222j
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Silicon nitride was formed by nitriding acid-leached and pyrolyzed rice husk in a nitrogen atmosphere. The nitridation kinetics of the pyrolyzed husk pellet over a temperature range of 1473-1723 K were studied by a thermal gravimetric analysis (TGA) technique. The effects of gas flow rate, pellet size, pellet-forming pressure, initial grain sizes, and temperature on the extent of nitridation were examined extensively Experimental results showed that the nitridation rate of the pyrolyzed husk pellet was distinctly faster than the conventional C/SiO2 mixture process. The rate expressions of the nitridation of the pyrolyzed husk pellet were determined. The activation energy was found to be 115+/-1kJ/mol. The reaction was mainly controlled by the diffusion of the gaseous reactant through the product layer. A kinetic model of the nitridation process was developed, and it gave good agreement with the experimental results.
引用
收藏
页码:3375 / 3383
页数:9
相关论文
共 22 条
[1]  
CHEN J-M, 1991, Proceedings of the National Science Council Republic of China Part A Physical Science and Engineering, V15, P412
[2]   CHLORINATION KINETICS OF SILICON DIOXIDE IN THE PRESENCE OF CARBON [J].
CHEN, JM ;
CHANG, FW ;
CHANG, CY .
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 1990, 29 (05) :778-783
[3]   THE CHLORINATION KINETICS OF RICE HUSK [J].
CHEN, JM ;
CHANG, FW .
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 1991, 30 (10) :2241-2247
[4]  
CHO YW, 1991, MATER SCI TECH SER, V7, P289, DOI 10.1179/026708391790183321
[5]  
Cutler IB, 1974, Patent No. [3,855,395, 3855395]
[6]   CARBOTHERMAL SYNTHESIS OF SILICON-NITRIDE - EFFECT OF REACTION CONDITIONS [J].
DURHAM, SJP ;
SHANKER, K ;
DREW, RAL .
JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 1991, 74 (01) :31-37
[7]   CARBOTHERMAL PREPARATION OF SILICON-NITRIDE - INFLUENCE OF STARTING MATERIAL AND SYNTHESIS PARAMETERS [J].
EKELUND, M ;
FORSLUND, B .
JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 1992, 75 (03) :532-539
[8]  
HANNA SB, 1985, T J BRIT CERAM SOC, V84, P18
[9]  
HENDRY A, 1975, SPECIAL CERAMICS, V6, P199
[10]  
KANEKO Y, 1988, ZAIRYO, V37, P65