High temperature oxidation of tantalum carbide powder


The high-temperature oxidation of tantalum carbide (TaC) powder was investigated to determine the application of refractory materials for space crafts. TaC powder with an average particle size of about 10 Jim was used in this experiment. The samples were oxidized in air at 573 to 1273K for 5 min to 25 h. The weight changes were measured to estimate the oxidation properties. Exposed for short oxidation times of 5 min, started at 873K, and weight changes increased with increasing oxidation temperature. The sample oxidized for 0.5 to 1 h exhibited growing weight gain with increasing oxidation temperature and constant weight gain over 973K. On the other hand, for oxidation times above two h, the weight gain had a maximum value of 1073 to 1273K. And it had a constant value of only 15%. Based on the X-ray diffraction analysis results, tantalum oxide was present on the surface of the samples oxidized at 973K. Tantalum carbide powders are mainly manufactured via three methods: (1) heat treatment in a non-oxidizing atmosphere using a mixture of tantalum metal and graphite powders, (2) solid carburization, such as self-propagating high-temperature synthesis (SHS) using the reaction heat between reactants by mixing tantalum and graphite powders, and (3) gaseous carburization using hydrocarbon gases such as methane, propane, and butane as the carburizing media for tantalum. In addition, other methods, such as reduction carburization, which employs a mixture of tantalum oxide (Ta2O5) and graphite powders to simultaneously induce reduction and carburization reactions, are being studied for commercialization. If you are looking for high quality, high purity and cost-effective Tantalum Carbide, or if you require the latest price of Tantalum Carbide, please feel free to email contact mis-asia.

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