Continuous fabrication of silicon carbide fiber tows by chemical vapor deposition

Journal Article · Thu Jun 01 04:00:00 EDT 1995 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/j.1151-2916.1995.tb08852.x· OSTI ID:82625

Lackey, W J; Hanigofsky, J A; Freeman, G B; Hardin, R D; Prasad, A ^[1]

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1. Georgia Inst. of Tech., Atlanta, GA (United States). Georgia Tech Research Inst.

The feasibility of preparing small-diameter, high-strength thermally stable silicon carbide fiber tows by the continuous chemical vapor deposition (CVD) of SiC onto carbon fiber tows was experimentally evaluated. Calculations of bending stresses and stresses caused by thermal expansion mismatch between the substrate and coating were used to evaluate the influence of coating thickness and substrate fiber diameter and type. Statistically designed and analyzed processing studies quantitatively showed the influence of key CVD process variables (temperature, pressure, and flow rates of CH{sub 3}SiCl{sub 3} and H{sub 2}) on fiber attributes such as coating thickness and uniformity, surface roughness, percent agglomeration, and strength. Emphasis was given to conceiving and evaluating various fiber spreading devices in order to enhance coating uniformity and to minimize filament agglomeration within a two. Uniform coatings and fiber tensile strengths as high as 4 GPa were achieved.

• Sponsoring Organization: USDOE
• OSTI ID: 82625
• Journal Information: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 6 Vol. 78; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CARBON FIBERS
CHEMICAL VAPOR DEPOSITION
COATINGS
COMPOSITE MATERIALS
CONCENTRATION RATIO
FABRICATION
FLOW RATE
HYDROGEN
PRESSURE DEPENDENCE
REGRESSION ANALYSIS
SILANES
SILICON CARBIDES
STRESSES
TEMPERATURE DEPENDENCE
TENSILE PROPERTIES