Preparation and Some Properties of Tantalum Carbide

摘要: Small tantalum carbide objects may be made by heating the from in dilute hydrocarbon atmospheres at temperatures >2000°K. Carburization proceeds quite rapidly above 2300°K diffusion of carbon initially deposited on surface into metal, principally along grain boundaries, to form a thin layer Ta2C which is quickly converted TaC. The latter has tensile strength 21–25 kg/mm2, work function φ=3.17 ev, an emissivity 0.40–0.46 between 2400° and 3500°K, rising with increasing temperature, resistivity ρ=102+0.0178 T (°K) ohm cm 1400° 3500°K.