The effect of degassing modes on the self-propagating reactions for the SiO2-Al-C system in the presence of reaction promoters

被引:5
作者
Abovyan, LS
Nersisyan, HH
Kharatyan, SL
Orrù, R
Cao, GC
机构
[1] Univ Cagliari, CESRA, Dipartimento Ingn Chim & Mat, I-09123 Cagliari, Italy
[2] Univ Cagliari, Unita Ricerca, Consorzio Inter Univ Scienza & Tecn Materiali, I-09123 Cagliari, Italy
[3] Nalbandyan Inst Chem Phys, LKSHS, Yerevan 375044, Armenia
关键词
SiO2/Al/C system; combustion synthesis; reaction promoters; degassing modes;
D O I
10.1016/S0272-8842(02)00102-5
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
The combustion synthesis process activated by organic polymers (Teflon and polystyrene) in the SiO2/Al/C system is investigated under the counter-current and co-current degassing conditions. It is found that the combustion parameters, i.e. wave velocity and temperature, and final product microstructure are influenced by the degassing mode considered as well as the type and amount of promoters added to the starting mixture. In particular, the combustion wave results to accelerate during its propagation when adopting the forward infiltration configuration and in absence of polystyrene. In addition, under the same degassing condition, the produced gases are found to provide a specific orientation on the growth direction of thread-like SiC crystals during final product formation. (C) 2002 Elsevier Science Ltd and Techna S.r.l. All rights reserved.
引用
收藏
页码:175 / 182
页数:8
相关论文
共 14 条
[1]   Synthesis of alumina-silicon carbide composites by chemically activated self-propagating reactions [J].
Abovyan, LS ;
Nersisyan, HH ;
Kharatyan, SL ;
Orrù, R ;
Saiu, R ;
Cao, G ;
Zedda, D .
CERAMICS INTERNATIONAL, 2001, 27 (02) :163-169
[2]   THEORY OF FILTRATIONAL COMBUSTION [J].
ALDUSHIN, AP ;
SEPLYARSKII, BS ;
SHKADINSKII, KG .
COMBUSTION EXPLOSION AND SHOCK WAVES, 1980, 16 (01) :33-40
[3]   NEW RESULTS IN THE THEORY OF FILTRATION COMBUSTION [J].
ALDUSHIN, AP .
COMBUSTION AND FLAME, 1993, 94 (03) :308-320
[4]  
[Anonymous], INT J SHS
[5]  
KOSTANYAN, 2000, INT J SHS, V9, P387
[6]   Fluid dynamics phenomena in the processes of self-propagating high-temperature synthesis [J].
Merzhanov, AG .
COMBUSTION SCIENCE AND TECHNOLOGY, 1995, 105 (4-6) :295-325
[7]   Combustion processes that synthesize materials [J].
Merzhanov, AG .
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY, 1996, 56 (1-4) :222-241
[8]  
Nersisyan H.H., 1983, KHIM J ARMENII, V36, P49
[9]  
Nersisyan H. H., 2000, INT J SHS, V9, P205
[10]  
NERSISYAN HH, 1991, COMBUST EXPLO SHOCK, V27, P720