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Mathematical Model for Chemical Vapor Infiltration in a Microwave‐Heated Preform
Author(s) -
Evans James W.
Publication year - 1993
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1993.tb08313.x
Subject(s) - chemical vapor infiltration , infiltration (hvac) , microwave , chemical vapor deposition , materials science , ceramic , porosity , porous medium , water vapor , chemical reaction , composite material , mechanics , mineralogy , chemistry , nanotechnology , physics , biochemistry , organic chemistry , quantum mechanics
A mathematical model, in which mass fluxes are expressed according to the “dusty gas” model, is proposed to described densification of a ceramic perform by chemical vapor infiltration (CVI) Local temperatures previously computed for a perform subjected to microwaves are input to the mass transport model. The model is solved numerically for deposition of SiC from trichloromethylsilane in a porous SiC perform. The computed results clearly demonstrate an advantage in employing, microwaves heating in CVI, Also, greater infilatration is achieved in a perform of greater pore size and at lower temperature. However for successful infiltration, diffusion/chemical‐reaction‐controlled CVI is shown to impose limits on the preform size.