Development of a two-step, forced chemical vapor infiltration process

Conference · Fri Dec 01 00:00:00 EST 1995

OSTI ID:134911

Matlin, W M; Stinton, D P; Besmann, T M ^[1]

---

1. Oak Ridge National Lab., TN (United States)

A two-step forced chemical vapor infiltration process was developed that reduced infiltration times for 4.45 cm dia. by 1.27 cm thick Nicalon{trademark} fiber pre-forms by two thirds while maintaining final densities near 90%. In the first stage of the process, micro-voids within fiber bundles in the cloth were uniformly infiltrated throughout the preform. In the second stage, the deposition rate was increased to more rapidly fill the macro-voids between bundles within the cloth and between layers of cloth. By varying the thermal gradient across the preform uniform infiltration rates were maintained and high final densities achieved.

• OSTI ID: 134911
• Report Number(s): CONF-9508127-; TRN: 95:006890-0013
• Resource Relation: Conference: 2. international conference on high temperature ceramic matrix composites, Santa Barbara, CA (United States), 21-25 Aug 1995; Other Information: PBD: 1995; Related Information: Is Part Of Ceramic transactions: High-temperature ceramic-matrix composites II: Manufacturing and materials development. Volume 58; Evans, A.G.; Naslain, R. [eds.]; PB: 400 p.
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
SILICON CARBIDES
PROCESSING
DEPOSITION
LAYERS
CHEMICAL VAPOR DEPOSITION
MICROSTRUCTURE