scholarly journals Chemical Vapor Infiltration Process Modeling and Optimization

1995 ◽  
Vol 410 ◽  
Author(s):  
T. M. Besmann ◽  
W. M. Matlin ◽  
D. P. Stinton
Keyword(s):  
Process Modeling ◽  
Scale Up ◽  
Chemical Vapor ◽  
Ceramic Composites ◽  
Chemical Vapor Infiltration ◽  
Chemical Degradation ◽  
Continuous Fiber ◽  
Infiltration Process ◽  
Unique Method ◽  
Vapor Infiltration

ABSTRACTChemical vapor infiltration is a unique method for preparing continuous fiber ceramic composites that spares the strong but relatively fragile fibers from damaging thermal, mechanical, and chemical degradation. The process is relatively complex and modeling requires detailed phenomenological knowledge of the chemical kinetics and mass and heat transport. An overview of some of the current understanding and modeling of CVI and examples of efforts to optimize the processes is given. Finally, recent efforts to scale-up the process to produce tubular forms are described.

Advances in Modeling of the Chemical Vapor Infiltration Process

1991 ◽  
Vol 250 ◽  
Author(s):  
Thomas L. Starr
Keyword(s):  
Chemical Vapor ◽  
Ceramic Matrix Composites ◽  
Ceramic Composites ◽  
Chemical Vapor Infiltration ◽  
Forced Flow ◽  
Material Transport ◽  
Process Technology ◽  
Infiltration Process ◽  
Design And Manufacture ◽  
Vapor Infiltration

AbstractThe technology of chemical vapor infiltration (CVI) has progressed dramatically over the past twenty-five years and stands now as the leading process for fabrication of high temperature structures using ceramic matrix composites. Modeling techniques also have advanced from extensions of catalyst theory to full 3-D finite element code with provision for temperature and pressure gradients. These modeling efforts offer insight into critical factors in the CVI process, suggest opportunities for further advances in process technology and provide a tool for integrating the design and manufacture of advanced components.Early modeling identified the competition between reaction and diffusion in the CVI process and the resulting trade-off between densification rate and uniformity. Modeling of forced flow/thermal gradient CVI showed how the evolution of material transport properties provides a self-optimizing feature to this process variation.“What-if” exercises with CVI models point toward potential improvements from tailoring of the precursor chemistry and development of special preform architectures.As a link between component design and manufacture, CVI modeling can accelerate successful application of ceramic composites to advanced aerospace and energy components.

scholarly journals Forced Chemical Vapor Infiltration of Tubular Geometries: Modeling, Design, and Scale-Up

1994 ◽  
Vol 365 ◽  
Author(s):  
D.P. Stinton ◽  
T.M. Besmann ◽  
W.M. Matlin ◽  
T.L. Starr ◽  
W.A. Curtain
Keyword(s):  
Mechanical Properties ◽  
Processing Time ◽  
Scale Up ◽  
Chemical Vapor ◽  
Ceramic Composites ◽  
Chemical Vapor Infiltration ◽  
Outer Diameter ◽  
Densification Process ◽  
Vapor Infiltration

ABSTRACTThe development of thick-walled, tubular ceramic composites has involved investigations of different fiber architectures and fixturing to obtain optimal densification and mechanical properties. The current efforts entail modeling of the densification process in order to increase densification uniformity and decrease processing time. In addition, the process is being scaled to produce components with a 10 cm outer diameter.

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