Thermal stability of a PCS-derived SiC fibre with a low oxygen content (Hi-Nicalon)

被引:171
作者
Chollon, G
Pailler, R
Naslain, R
Laanani, F
Monthioux, M
Olry, P
机构
[1] CTR HELIOPARC,LAB MARCEL MATHIEU,F-64000 PAU,FRANCE
[2] EUROPEAN SOC PROP,F-33165 ST MEDARD,FRANCE
关键词
D O I
10.1023/A:1018541030308
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The oxygen free Si-C fibre (Hi-Nicalon) consists of beta-SiC nanocrystals (approximate to 5 nm) and stacked carbon layers of 2-3 nm in extension, in the form of carbon network along the fibre. This microstructure gives rise to a high density, tensile strength, stiffness and electrical conductivity. With respect to a Si-C-O fibre (Nicalon NL202), the Si-C fibres have a much greater thermal stability owing to the absence of the unstable SiOxCy phase. Despite its high chemical stability, it is nevertheless subject to a slight structural evolution at high temperatures of both SiC and free carbon phases, beginning at pyrolysis temperatures in the range 1200-1400 degrees C and improving with increasing pyrolysis temperature and annealing time. A moderate superficial decomposition is also observed beyond 1400 degrees C, in the form of a carbon enriched layer whose thickness increases as the pyrolysis temperature and annealing time are raised. The strength reduction at ambient for pyrolysis temperatures below 1600 degrees C could be caused by SiC coarsening or superficial degradation. Si-C fibres have a good oxidation resistance up to 1400 degrees C, due to the formation of a protective silica layer.
引用
收藏
页码:327 / 347
页数:21
相关论文
共 74 条
[51]  
ROCABOIS P, 1993, THESIS I NATL POLYTE
[52]  
SAZAKI Y, 1987, J MATER SCI, V22, P443
[53]   REACTIVITY AND MOLECULAR-STRUCTURE OF SILICON-CARBIDE FIBERS DERIVED FROM POLYCARBOSILANES .1. THERMAL-BEHAVIOR AND REACTIVITY [J].
SCHRECK, P ;
VIXGUTERL, C ;
EHRBURGER, P ;
LAHAYE, J .
JOURNAL OF MATERIALS SCIENCE, 1992, 27 (15) :4237-4242
[54]  
SHIMOO T, 1992, NIPPON SERAM KYO GAK, V100, P929
[55]  
SHIMOO T, 1993, NIPPON SERAM KYO GAK, V101, P1379, DOI 10.2109/jcersj.101.1379
[56]   Pyrolysis of Si-C-O fibers (Nicalon) at temperatures from 1473 K to 1673 K [J].
Shimoo, Toshio ;
Chen, Hemin ;
Okamura, Kiyohito .
Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan, 1992, 100 (1157) :48-53
[57]  
SHIMOO T, 1994, NIPPON SERAM KYO GAK, V102, P617, DOI 10.2109/jcersj.102.617
[58]   OXIDATION-KINETICS OF HOT-PRESSED SILICON-CARBIDE [J].
SINGHAL, SC .
JOURNAL OF MATERIALS SCIENCE, 1976, 11 (07) :1246-1253
[59]   STRUCTURAL EVOLUTIONS FROM POLYCARBOSILANE TO SIC CERAMIC [J].
SORARU, GD ;
BABONNEAU, F ;
MACKENZIE, JD .
JOURNAL OF MATERIALS SCIENCE, 1990, 25 (09) :3886-3893
[60]  
TAKEDA M, 1992, CERAM ENG SCI P, V13, P209