Manufacture of ceramic composites by forced chemical vapor infiltration techniques
- Univ. of Tennessee, Knoxville, TN (United States)
- Oak Ridge National Lab., TN (United States)
Forced chemical vapor infiltration (FCVI) methods have been developed to fabricate ceramic composites. The FCVI techniques allow the rapid densification of fibrous preforms with ceramic matrices. Computer-based modeling was used to develop a multi-step forced chemical vapor infiltration process. In particular, a finite-volume computer model, GTCVI, developed specifically for the FCVI process was used to determine optimal processing schemes. The results indicate that in the first step, processing conditions should be tailored to uniformly infiltrate the fine pores within fiber bundles. Once bundles are filled, conditions should be changed to compensate for new transport conditions and surface-to-volume effects associated with the coarse porosity between fiber bundles and layers of fabrics. The model-derived conditions allow processing times for a 1.3 cm thick preform to be decreased from 24 hours to 11 hours while maintaining an average final density greater than 85%.
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 175379
- Report Number(s):
- CONF-950686-; CNN: Contract 11X-SR3 47; TRN: 95:006111-0350
- Resource Relation:
- Conference: Joint applied mechanics and materials summer meeting, Los Angeles, CA (United States), 28-30 Jun 1995; Other Information: PBD: 1995; Related Information: Is Part Of AMD - MD `95: Summer conference; PB: 520 p.
- Country of Publication:
- United States
- Language:
- English
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