Oxidation beryllides

Beryllia. See beryllium oxide. Beryllides. A group of intermetallic compounds of potential interest as special ceramics. Cell dimensions and types of structure have been reported for the beryllides of Ti, V, Cr, Zr, Nb, Mo, Hf and Ta (A. Zalkin el ai, Acta Cryst., 14, 63,1961). 

Table 1. High Temperature Oxidation Resistant Beryllides...

The beryllides continue to be of interest for high temperature aerospace applications because of their oxidation resistance, low density, and high strength at elevated temperature (7). The limited strain capacity of the materials, particulady at low temperatures, has thus far prevented actual use. 

The research activity on the oxidation and corrosion in Japan is characterised by the fact that the major effort has been expended on TiAl-base materials. The research on MoSi2 follows that on TiAl-base materials with much small percentage. Other alumi-nides and silicides are being dealt with. There seems to be no research on beryllides. Throughout this paper AI203 means a-alumina and TiOz rutile, and the specimen composition is expressed in mass per cent unless otherwise stated. 

Nb-Aluminides, precious metal and exotic aluminides. Laves phases and in-situ composites, silicides, and beryllide intermetallics. Given previous excellent reviews of the oxidation of intermetallics (e.g. Aitken, 1967 Doychak, 1994 Meier, 1996 Welsch et al., 1996), these sections emphasize the findings of recent studies. Areas in need of additional research, and issues that have already been well explored or are unlikely to yield fruitful results, are noted. 

Perkins, F. C. (1963), in Intermediate Temperature Oxidation of Beryllides US AEC report DRI-2128. 

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