Fiber-Reinforced Tubular Composites by Chemical Vapor Infiltration°

1991 ◽  
Vol 250 ◽  
Author(s):  
D. P. Stinton ◽  
R. A. Lowden ◽  
T. M. Besmann
Keyword(s):  
Mechanical Properties ◽  
Thermal Gradient ◽  
Chemical Vapor ◽  
Chemical Vapor Infiltration ◽  
Forced Flow ◽  
Matrix Composites ◽  
Fiber Reinforced ◽  
Infiltration Process ◽  
Filament Wound ◽  
Vapor Infiltration

AbstractA forced-flow thermal-gradient chemical vapor infiltration process has been developed to fabricate composites of thick-walled tubular geometry common to many components. Fibrous preforms of different fiber architectures (3-dimensionally braided and filament wound) have been investigated to accommodate components with different mechanical property requirements. This paper will discuss the fabrication of tubular, fiber-reinforced SiC matrix composites and their mechanical properties.

Fiber-Reinforced Composites for Gas Turbine Applications

1992 ◽  
Author(s):  
D. P. Stinton ◽  
R. A. Lowden ◽  
T. M. Besmann
Keyword(s):  
Gas Turbines ◽  
Chemical Vapor ◽  
Chemical Vapor Infiltration ◽  
Forced Flow ◽  
Matrix Composites ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Infiltration Process ◽  
Hot Gas ◽  
Filament Wound

Fiber-reinforced SiC matrix composites are being considered for application in hot-gas turbines. A forced-flow thermal-gradient chemical vapor infiltration process has been developed to fabricate composites of thick-walled tubular geometry common to many components. Fibrous preforms of different fiber architectures (3-dimensionally braided and filament wound) have been investigated to accommodate components with different mechanical property requirements. This paper will discuss the fabrication of tubular fiber-reinforced SiC matrix composites and their mechanical properties.

Fabrication of carbon-carbon composites by forced flow-thermal gradient chemical vapor infiltration

1995 ◽  
Vol 10 (6) ◽  
pp. 1469-1477 ◽  
Author(s):  
Sundar Vaidyaraman ◽  
W. Jack Lackey ◽  
Garth B. Freeman ◽  
Pradeep K. Agrawal ◽  
Matthew D. Langman
Keyword(s):  
Thermal Gradient ◽  
Chemical Vapor ◽  
Carbon Matrix ◽  
Chemical Vapor Infiltration ◽  
Forced Flow ◽  
Carbon Cloth ◽  
Matrix Composites ◽  
Infiltration Process ◽  
Order Of Magnitude ◽  
Vapor Infiltration

Carbon fiber-carbon matrix composites were fabricated using the forced flow-thermal gradient chemical vapor infiltration (FCVI) process. The preforms for the infiltration were prepared by stacking 40 layers of carbon cloth in a graphite holder. The preforms were infiltrated with carbon using propylene or methane as a reactant, with hydrogen as a diluent. Composites with porosities as low as 7% have been processed within 8-12 h. The highest deposition rate obtained in the present study was ∼3 μm/h, which is more than an order of magnitude faster than the typical value of 0.1-0.25 μm/h for the isothermal infiltration process.

Optimization of Bundle Infiltration in the Forced Chemical Vapor Infiltration (FCVI) Process

1994 ◽  
Vol 365 ◽  
Author(s):  
W.M. Matlin ◽  
D.P. Stinton ◽  
T.M. Besmann ◽  
P.K. Liaw
Keyword(s):  
Thermal Gradient ◽  
Processing Time ◽  
Chemical Vapor ◽  
Computer Code ◽  
Chemical Vapor Infiltration ◽  
Forced Flow ◽  
Infiltration Process ◽  
Gradient Effects ◽  
Process Material ◽  
Vapor Infiltration

ABSTRACTA two-step forced-flow, thermal-gradient, chemical vapor infiltration process (FCVI) was proposed to reduced processing time while maintaining uniformly high densities. GTCVI, a finite-volume computer code developed specifically for the FCVI process was used to model thermal gradient effects on processing time and density. An optimum thermal gradient was determined and used to process material with uniformly infiltrated bundles.

Rapid Processing of Carbon-Carbon Composites by Forced Flow-Thermal Gradient Chemical Vapor Infiltration (FCVI)

1994 ◽  
Vol 365 ◽  
Author(s):  
S. Vaidyaraman ◽  
W. J. Lackey ◽  
P. K. Agrawal ◽  
G. B. Freeman ◽  
M. D. Langman
Keyword(s):  
Thermal Gradient ◽  
Chemical Vapor ◽  
Carbon Matrix ◽  
Chemical Vapor Infiltration ◽  
Forced Flow ◽  
Carbon Cloth ◽  
Matrix Composites ◽  
Order Of Magnitude ◽  
Rapid Processing ◽  
Vapor Infiltration

ABSTRACTCarbon fiber-carbon matrix composites were fabricated using the forced flow-thermal gradient chemical vapor infiltration (FCVI) process. Preforms were prepared by stacking 40 layers of plain weave carbon cloth in a graphite holder. The preforms were infiltrated using propylene, propane, and methane. The present work showed that the FCVI process is well suited for fabricating carboncarbon composites; without optimization of the process, we have achieved uniform and thorough densification. Composites with porosities as low as 7% were fabricated in 8–12 h. The highest deposition rate obtained in the present study was ∼3 μm/h which is more than an order of magnitude faster than the typical value of 0.1–0.25 μm/h for the isothermal process. It was also found that the use of propylene and propane as reagents resulted in faster infiltration compared to methane.

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