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As the demands for materials with improved high-temperature properties continue, more research is being directed toward combining materials into composites to provide properties not available in a single material. An excellent example is a coated metal where the corrosion and oxidation resistance or other properties of an alloy are improved or modified by a thin layer of ceramic, cermet or other metal bonded to the surface. Early developments during World War II and continuing research have produced a number of high-temperature coatings which provide a designer with a unique method for extending a specific materials capability. This paper is a brief review of some ceramic, cermet, and metallic coatings which indicates the scope of the coating development and applications.

Practical uses of beryllium assemblies in meeting current critical aerospace and nuclear requirements are discussed. Emphasis is placed upon braze joining structural components and effective manufacturing methods. Recent technological advancements in metallurgical bonding of beryllium make possible fabrications heretofore not considered as feasible. Brazing, braze welding, and fusion welding of beryllium to itself and to dissimilar metals is evaluated by reference to specific applications. Brazing receives prime consideration as it is the most versatile and widely used metallurgical joining process.