Pratt & Whitney is focusing on development of very-high-temperature ceramic matrix composites (CMC) in rotating structures for its future commercial and military engines. The company says it is “not convinced” of the utility of the lightweight material for static parts. The approach, which Pratt says is partially driven by the low stage-count configuration of its newer engines, and partly by a growing preference for thermally conductive advanced alloys, appears to be sharply ...

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