Creep Forming of Carbon-Reinforced Ceramic-Matrix Composites

Vaughn, Wallace L.; Scotti, Stephan J.; Ashe, Melissa P.; Connolly, Liz

A set of lecture slides describes an investigation of creep forming as a means of imparting desired curvatures to initially flat stock plates of carbon-reinforced ceramic-matrix composite (C-CMC) materials. The investigation is apparently part of a continuing effort to develop improved means of applying small CCMC repair patches to reinforced carbon-carbon leading edges of aerospace vehicles (e.g., space shuttles) prior to re-entry into the atmosphere of the Earth. According to one of the slides, creep forming would be an intermediate step in a process that would yield a fully densified, finished C-CMC part having a desired size and shape (the other steps would include preliminary machining, finish machining, densification by chemical vapor infiltration, and final coating). The investigation included experiments in which C-CMC disks were creep-formed by heating them to unspecified high temperatures for time intervals of the order of 1 hour while they were clamped into single- and double-curvature graphite molds. The creep-formed disks were coated with an oxidation- protection material, then subjected to arc-jet tests, in which the disks exhibited no deterioration after exposure to high-temperature test conditions lasting 490 seconds.

Document ID

20100011190

Acquisition Source

Langley Research Center

Document Type

Other - NASA Tech Brief

External Source(s)

http://www.embeddedtechmag.com/component/content/article/2511

Authors

Date Acquired

August 24, 2013

Publication Date

December 1, 2007

Publication Information

Publication: NASA Tech Briefs, December 2007

Subject Category

Report/Patent Number

Distribution Limits

Public

Public Use Permitted.

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20100011190.pdf

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