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Executive Summary
Pages 1-5

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From page 1...
... · Non-oxide fibers are generally creep resistant but lack chemical stability; they are prone to oxidation. Consequently, stress oxidation limits the durability of nonoxide composites, especially at intermediate temperatures (i.e., 700 to 900°C [1,292 to 1,652°Fi)
From page 2...
... · assessed the capabilities of current fibers to meet future performance needs · recommended promising research directions for developing fibers and coatings for improved performance in high temperature applications identified materials processing technologies that have the potential to produce high-temperature ceramic fibers and coatings cost effectively identified incentives for and barriers to the development of commercial-scale high-temperature fibers for low-volume applications By limiting the scope of this study to fibers and their coatings, independent of CMC processing and matrix materials, the committee was able to focus on issues that limit the strength and toughness of CMCs, particularly at high temperatures. The discussion of composite materials in this TABLE ES- 1 Typical Property Ranges for Ceramic Fibers CERAMIC FIBERS AND COATINGS: ADVANCED MATERIALS FOR THE TVEENTY-FIRST CENTURY report is limited to providing a context for discussions, conclusions, and recommendations regarding ceramic fibers and coatings.
From page 3...
... Oxide fibers are inherently resistant to oxidation but have limited creep resistance because of higher diffusivities compared to SiC. Creep rates decrease with increasing grain size, but this advantage is offset by decreasing strength.
From page 4...
... · Non-oxide fiber coatings research should be focused on: - concepts that enable high durability with cracked matrices at the "pest" temperature a system approach that includes concepts for improving the oxidation resistance of fiber coatings in CERAMIC FIBERS AND COATINGS: ADVANCED MATERIALS FOR THE TWENTY-FIRST CENTURY dry and moist atmospheres and "sealing" matrix cracks as they form investigating regenerative in-situ coatings Impact. Durable coatings for non-oxide fibers would provide suitable lifetimes for many applications, such as thermally loaded gas turbine components and heat exchangers.
From page 5...
... Recommendation 2 is the most important in this category. The oxidation resistance of oxide fibers is attractive, but poor creep resistance is a significant limitation.

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