POWDER METALLURGY IN NUCLEAR ENGINEERING
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概要
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Powder metallurgy proves to be a most useful metallurgical technique for the fabrication of nuclear reactor components, especially for fuel elements. The variables which control the powder metallurgy of uranium, thorium, beryllium and zirconium and the oxides of some of these materials, are well under control. Powder metallurgy is the only technique which permits fabrication of the so.called matrix-type fuel elements, the core of which consists of a cermet material, usually with UO<SUB>2</SUB> particles dispersed in a metallic matrix.<BR>The advantages which powder metallurgy has to offer in nuclear engineering are especially the small grain structure of some of the sintered products and the random distribution of point defects in the crystal lattices. The ability of powder metallurgical products to bond well to other metals is also superior to that of metals made by a more conventional technique-a fact which is of importance with respect to the heat transfer problems occurring in nuclear reactors.<BR>New powder metallurgy methods, such as powder densification by the rolling technique or metal powder slip casting, offer many advantages in nuclear engineering.
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