Cermet alloys of rhenium with yttrium hexaboride
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Alloys of rhenium with yttrium hexaboride (1–95 wt.%) have been produced by the powder metallurgy method. It is shown that an alloy of rhenium with 1% YB6 is a solid solution of YB6 in rhenium. X-ray and metallographical analyses of the alloys with 20, 50, 70, and 95% YB6 have shown that the components of their phases were formed on the basis of Re7B3, ReB3, YB4, and YB6.
The electrical resistance of the alloys increases with increase in their content of YB6 to the alloy Re+ 50% YB6. In alloys with a content < 50% Re, the specific resistance falls with decrease in the latter. The lowest work function in the given system was obtained for the alloy Re+ 20% YB6.
The different value of the work function of the alloys Re+ 1% YB6 and W+ 1% YB6 are discussed from the point of view of the possibility of electron exchange between the absorbed yttrium atoms and the substrate, leading to the stabilization of stable electron states in the absorbent-absorbate system.
KeywordsSolid Solution Electron State Yttrium Work Function Powder Metallurgy
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