Published: Jan 1992
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High-temperature materials include monolithic ceramics for automotive gas turbine engines and also metallic/intermetallic and ceramic matrix composites for a range of aerospace applications. These are materials that can withstand extreme operating temperatures that will prevail in advanced high-efficiency gas turbine engines. High-temperature engine components are very likely to consist of complex composite structures with three-dimensionally interwoven and various intermixed ceramic fibers. The thermomechanical properties of components made of these materials are actually created in-place during processing and fabrication stages.The complex nature of these new materials creates strong incentives for exact standards for unambiguous evaluations of defects and microstructural characteristics. NDE techniques and standards that will ultimately be applicable to production and quality control of high-temperature materials and structures are still emerging. The needs range from flaw detection to below 100-Min levels in monolithic ceramics to global imaging of fiber architecture and matrix densification anomalies in composites. The needs are different depending on the processing stage, fabrication method, and nature of the finished product. This report discusses the standards that must be developed in concert with advances in NDE technology, materials processing research, and fabrication development. High-temperature materials and structures that fail to meet stringent specifications and standards are unlikely to compete successfully either technologically or in international markets.
NDT, NDE, ceramics, refractory composites, materials characterization, signal analysis, turbine engines, R&QA, standards
Branch manager, NASA Lewis Research Center, Structural Integrity Branch, Cleveland, OH