Precursor impregnation and pyrolysis (PIP) processing of barium aluminosilicate - Nicalon composites
- Univ. of Michigan, Ann Arbor, MI (United States)
Efforts were made to evaluate the utility of the polymer precursor method of processing Nicalon fiber reinforced barium aluminosilicate (BAS) composites. A novel precursor, synthesized in one step from BaO, Al(OH){sub 3} and SiO{sub 2} was used. This precursor, with a ceramic yield of {approx} 30 wt. %, was used to assess three forms of PIP processing. Fiber preforms consisting of 4-12 0/90{degrees} cross-woven Nicalon plies were impregnated with precursor/ethanol solutions at ambient pressure and under vacuum/pressure. Impregnated preforms were typically fired in air to 550{degrees}C to remove carbon and form a structurally intact composite. Cycle times were 12 h. Amorphous densities approaching 60-70 % of theory (rule of mixtures) were achieved with the fewest PIP cycles by the application of vacuum to the samples before infiltration, the use of pressure to infiltrate the samples and increasing the ceramic content of the precursor solution. Strontium aluminosilicate (SAS) was added to promote the hexagonal to monoclinic phase transformation.
- OSTI ID:
- 530676
- Report Number(s):
- CONF-9604124-; CNN: Grant NCC3-381; TRN: 97:003389-0012
- Resource Relation:
- Conference: 98. annual meeting of the American Ceramic Society, Indianapolis, IN (United States), 14-17 Apr 1996; Other Information: PBD: 1996; Related Information: Is Part Of Ceramic transactions: Advances in ceramic-matrix composites III. Volume 74; Bansal, N.P.; Singh, J.P. [eds.]; PB: 667 p.
- Country of Publication:
- United States
- Language:
- English
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