The control of gas phase kinetics to maximize densification during chemical vapor infiltration
The control of gas phase kinetics to maximize densification during chemical vapor infiltration
复制标题
控制气相动力学以在化学蒸气渗透过程中最大化致密化
DOI：
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复制
发表时间：
1990
期刊：
影响因子：
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通讯作者：
B. Sheldon
中科院分区：
文献类型：
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作者：
B. Sheldon
在通过等温化学气相渗透制备复合材料期间的一个严重问题是基体在主体的外边缘处更快地形成并且在内部捕获大量的孔隙。理论上，这个问题可以通过控制气相动力学来消除，以获得在预制件中心比在其外表面更快的致密化。一级气相反应，然后由一级沉积反应的分析表明，在一个相对较窄的范围内的条件下，改善的渗透是可能的。
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.