Mass transport measurements and modeling for chemical vapor infiltration

Conference · Mon Dec 01 04:00:00 EST 1997

OSTI ID:330664

Starr, T L; Chiang, D Y; Fiadzo, O G; Hablutzel, N ^[1]

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1. Georgia Inst. of Tech., Atlanta, GA (United States). School of Materials Science and Engineering

This project involves experimental and modeling investigation of densification behavior and mass transport in fiber preforms and partially densified composites, and application of these results to chemical vapor infiltration (CVI) process modeling. This supports work on-going at ORNL in process development for fabrication of ceramic matrix composite (CMC) tubes. Tube-shaped composite preforms are fabricated at ORNL with Nextel{trademark} 312 fiber (3M Corporation, St. Paul, MN) by placing and compressing several layers of braided sleeve on a tubular mandrel. In terms of fiber architecture these preforms are significantly different than those made previously with Nicalon{trademark} fiber (Nippon Carbon Corp., Tokyo, Japan) square weave cloth. The authors have made microstructure and permeability measurements on several of these preforms and a few partially densified composites so as to better understand their densification behavior during CVI.

• Research Organization: Oak Ridge National Lab., TN (United States)
• OSTI ID: 330664
• Report Number(s): CONF-9705115--PROC.; ORNL/FMP--97/1; ON: DE98007329
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CERAMICS
CHEMICAL VAPOR DEPOSITION
FIBERS
IMPREGNATION
MASS TRANSFER
MATHEMATICAL MODELS
MICROSTRUCTURE
PERMEABILITY
REINFORCED MATERIALS