MICROSTRUCTURE DEVELOPMENT OF OXYCARBIDE COMPOSITES DURING ACTIVE-FILLER-CONTROLLED POLYMER PYROLYSIS

被引：72

作者：

ERNY, T ^{[1
]}

SEIBOLD, M ^{[1
]}

JARCHOW, O ^{[1
]}

GREIL, P ^{[1
]}

机构：

[1] UNIV HAMBURG, INST MINERAL, W-2000 HAMBURG 13, GERMANY

来源：

JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 1993年 / 76卷 / 01期

关键词：

D O I：

10.1111/j.1151-2916.1993.tb03709.x

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 microstructure development of a ceramic composite material fabricated by active-filler-controlled polymer pyrolysis (AFCOP) was investigated. During heating of a polysiloxane precursor mixed with titanium powder in argon atmosphere up to 1400-degrees-C, thermally induced decomposition of the polymer phase is combined with simultaneous carburization of the transition metal filler. Precipitation of nanocrystalline titanium carbide at the filler particle surface starts above 400-degrees-C, and larger, faceted carbide particles have grown above 800-degrees-C. A skeleton of turbostratic carbon is formed above 800-degrees-C in the polymer-derived silicon oxycarbide matrix from which b-silicon carbide and cristobalite crystallize above 1000-degrees-C. A pronounced reduction in linear shrinkage involved in polymer-ceramic conversion is observed. The shrinkage reduction ranges from more than 25% for the filler-free precursor to less than 10% in the presence of 30 vol% of the titanium filler. Thus, active-filler-controlled pyrolysis offers the possibility of controlling shrinkage and porosity formation during polymer-ceramic conversion in order to fabricate bulk components from organometallic polymer precursor systems.

引用

页码：207 / 213

页数：7

共 46 条

[1]

AINSLIE NG, 1962, S NUCLEATION CRYSTAL, P97

[2]

[Anonymous], 1990, DRYING SOL GEL SCI, DOI [10.1016/B978-0-08-057103-4.50013-1, DOI 10.1016/B978-0-08-057103-4.50013-1]

[3] THERMAL REDISTRIBUTION REACTIONS IN CROSS-LINKED POLYSILOXANES [J].