Behavior of ultrafine titanium carbide powders during annealing and sintering
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An investigation was carried out into the effect of hydrogen annealing temperature on the composition and particle size of a titanium carbide powder produced by plasma-chemical synthesis (S = 8.2 m2/g, 20.1% total C, 2.1% free C). It was found that heating substantially increased the specific surface of the powder and, according to electron microscopical examinations, slightly decreased its mean particle size. The amount of free carbon began to increase in the range 1400–1483°K, and at the same time the particle size of the powder grew. The greatest-increase in relative density was exhibited by specimens pressed in the pressure range 58.8–392 MPa, using polyvinyl alcohol as plasticizer. The highest density (porosity 5.5%) was attained in specimens pressed under a pressure of 58.8 MPa and sintered isothermally in a vacuum at 2090°K.
KeywordsHydrogen Alcohol Particle Size Titanium Porosity
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