Diagram of state of the chromium-boron system
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On the basis of new investigations of the chromium-boron system and of a consideration of the literature data there is proposed a more plausible diagram of state of the system.
There has been confirmed the absence of the compounds Cr4B, Cr2B with a structure of the type CuAl2, Cr3B2, and CrB6.
For the compound Cr2B, with a Mn4B structure (as the most plausible), there has been determined a temperature of the peritectic decomposition of ∼1870°C.
Betweenα-Cr and Cr2B there is formed a eutectic, whose melting temperature is evidently effected by impurities.
The compound CrB2 is in equilibrium with a solid solution of chromium inβ-rhombohedral boron, and forms with it a eutectic containing ∼83 at.% boron and meltingat∼ 1830°C. The maximum solubility of chromium in boron is ∼2 at.%.
The compound known as CrB6 is chromium oxyboron and can be obtained by sintering the components at a not too high vacuum.
KeywordsChromium Solid Solution Boron Melting Temperature High Vacuum
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