By H. Gleiter (auth.), Prof. Dr. Wolfgang G. J. Bunk (eds.)
Engineering fabrics are normally used for buildings. consequently high-strength, stiffness and enough sturdiness are of leading value. for a very long time engineers inspiration first by way of metals. Ma terial scientists constructed alloys adapted to the wishes of in dustry. Ceramics are recognized to be brittle and for this reason no longer compatible within the first position for structural program less than pressure. Polymers with their low modulus grew to become beautiful whilst rein pressured with high-strength fibres. Composites processed by way of poly mer, steel or ceramic matrices and high-strength reinforcements were brought into many sectors of undefined. Engineering fabrics for structural purposes fulfil a functionality: they face up to excessive stresses, temperatures, fatigue, creep and so forth. yet often we don't name them useful fabrics. practical fabric serve purposes except classical engineering fields. electrical energy accomplishing fabrics, semi conductors, reminiscence alloys and others are known as practical fabrics. either different types of fabrics structural and sensible - hide the points of the DLR-Seminar 1991 on "Advanced structural and sensible materials". in study and The seminar is concentrated on complex fabrics improvement or on the fringe of being brought into the marketplace. twin personality: choice was once given to fabrics with a structural and useful, a few of them extra structural, a few extra sensible of their strength. It was once essential to decide upon ordinary and consultant households of through the years by way of R + D actions slightly matured mate rials. It used to be no longer meant to hide all attainable techniques in a half-days seminar.
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Additional resources for Advanced Structural and Functional Materials: Proceedings of an International Seminar Organized by Deutsche Forschungsanstalt für Luft- und Raumfahrt (DLR), Köln, June 1991
50, 472 (1987). 77. Y. Ishida and T. Ozawa, scripta Metall. ~, 1103 (1975). 78. D. Wolf~ MRS Bulletin~, 42 (1990). 79. H. W. Siegel (eds), Proc. Acta Metallurgica Conference on Materials with Ulrafeine Microstructures, 1-5 October 1990, Atlantic City, Acta Metall. in press. 80. R. Philipot, D. Wolf and S. Yip, MRS Bulletin Oct. 1990, 38. 81. G. Herzer and H. Warlimont, Proc. Acta Metallurgica Conference on Materials with Ultrafine Microstructures, 1-5 October 1990, Atlantic City, Acta Metall. in press.
Their technological application has been hampered so far by brittleness. Ductile nanocrystalline ceramics may be used as 31 a new type of ceramic material in their own right. However, the plasticity may also be utilized for processing by extrusion or rolling. subsequently, the material may be fully or partially converted back into a conventional ceramic. , hardness and chemical resitivity) of a conventional ceramic. However the interior of such a material would still be ductile. The nanocrystalline approach deviates from the conventional strategy to defeat the brittleness of ceramics by improvements in processing and/or composition.
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