A FLOATING ZONE TECHNIQUE FOR THE GROWTH OF CARBIDE SINGLE CRYSTALS.
MARTIN MARIETTA CORP BALTIMORE MD RESEARCH INST FOR ADVANCED STUDIES
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Single crystals of pure and alloyed carbides of different carbon-to-metal ratio have been prepared using a floating zone technique. This paper discusses application of this technique specifically to the growth of VC single crystals. Longitudinal variations in composition from about VC0.82 to VC0.75 are observed when a rod of initial uniform composition VC0.75 is zone refined. Variations in composition from about VC0.85 to VC0.88 are produced in rods initially of composition VC0.88. However, since VC0.83 is close to the melting-point maximum in the VC phase, little variation in composition is observed on zone refining. These variations in composition are as expected from considerations of the phase diagram and the principles of zone refining. The production of rods of constant composition utilizing the principles of zone levelling is discussed. Author