Ceramic composites: Component fabrication. Topical report, December 1, 1987-February 28, 1991
TL;DRAbstract
A method for producing silicon carbide whisker reinforced mullite composite tubes for use as thermostructural components in chemically aggressive environments was developed. A laminate fabrication methodology developed in previous studies at the Center for Advanced Materials (CAM) for fabricating planar species with functionally graded properties was adapted for the fabrication of tubular geometries. The process consists of tape-casting whisker reinforced mullite laminae, following by winding the laminae onto graphite mandrels, encapsulating in fused silica envelopes, and densifying via hot isostatic pressing. Significant effort was directed at proper mandrel properties selection, and identifying hot isostatic pressing parameters to achieve fully densified, crack-free tubes. Dense tubes containing up to 30 volume percent silicon carbide whiskers were successfully fabricated.
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A method for producing silicon carbide whisker reinforced mullite composite tubes for use as thermostructural components in chemically aggressive environments was developed. A laminate fabrication methodology developed in previous studies at the Center for Advanced Materials (CAM) for fabricating planar species with functionally graded properties was adapted for the fabrication of tubular geometries. The process consists of tape-casting whisker reinforced mullite laminae, following by winding the laminae onto graphite mandrels, encapsulating in fused silica envelopes, and densifying via hot isostatic pressing. Significant effort was directed at proper mandrel properties selection, and identifying hot isostatic pressing parameters to achieve fully densified, crack-free tubes. Dense tubes containing up to 30 volume percent silicon carbide whiskers were successfully fabricated.
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