Production of refractory compound granules
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A study was made of two methods of preparation of metallic carbide and boride granules, involving: a) sintering without an inert packing material and b) passing a powdered material through the hot zone of a vertical tube resistance furnace.
It was established that, to obtain Cr3C2 and CrB granules of maximum apparent density, it is necessary to perform sintering in two stages, consisting of presintering at 1200°C and resintering for 20 min at a temperature as close as possible to Tm of the granule material.
It was also found that, to obtain refractory compound granules of spherical shape, the temperature in the hot zone of the spheroidization apparatus must be some 150–200°C higher than Tm of the refractory compound.
KeywordsFurnace Carbide Boride Spherical Shape Apparent Density
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