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

来源：

JOURNAL OF MATERIALS RESEARCH | 1990年 / 5卷 / 11期

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.

引用

页码：2729 / 2736

页数：8