THE CONTROL OF GAS-PHASE KINETICS TO MAXIMIZE DENSIFICATION DURING CHEMICAL VAPOR INFILTRATION

被引:13
作者
SHELDON, BW
机构
[1] Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge
关键词
D O I
10.1557/JMR.1990.2729
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
A serious problem during the fabrication of composite materials by isothermal chemical vapor infiltration is that the matrix forms more rapidly at the external edges of the body and traps a large amount of porosity inside. In theory, this problem can be eliminated by controlling the gas-phase kinetics to obtain densification which is more rapid in the center of a preform than at its outer surfaces. An analysis of a first-order gas-phase reaction followed by a first-order deposition reaction indicates that improved infiltration is possible under a relatively narrow range of conditions. © 1990, Materials Research Society. All rights reserved.
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页码:2729 / 2736
页数:8
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