Temperature does hafnium carbide melt


Properties. Individually, tantalum and hafnium carbide have the highest melting points among the binary compounds, 4,041 K (3,768 °C; 6,814 °F) and 4,232 K (3,959 °C; 7,158 °F), respectively, and their "alloy" with a composition Ta4HfC5 has a melting point of 4,178 K (3,905 °C; 7,061 °F). Although the quality and performance of ceramic components are important, the cost of mass production is the key factor in commercializing HfC ceramics. Thus it is essential to develop techniques for synthesizing ceramic powder with reasonably low production costs. With this point of view, many of the fabrication as mentioned above methods would never meet commercialization. Hafnium Carbide (HfC) is one example of advanced ceramic fiber matrices. It is a compound with the highest known melting temperature: 3890C. Hafnium carbide (HfC) is another ultrahigh-temperature ceramic with superior oxidation resistance. Unlike HfB2, which forms liquid phase oxide to seal the pores in the oxide scales, HfC forms a dense, crack-free oxy carbide layer when exposed to oxygen that prevents further oxidation. The oxy carbide layer is a metastable phase obtained from the oxygen absorption into HfC and substitute carbon atoms. HfC can absorb up to 30% of oxygen without transforming into HfO2. Zhang et al. sintered pure HfC without any sintering aid addition by spark plasma sintering (SPS) and achieved a 98% dense pellet. During plasma jet oxidation testing of pure HfC, it was observed that HfO2 formed due to the rapid speed of the oxygen entering the sample, and the oxy carbide layer formed was merely microns thick. Thus, leading to a thick oxide scale formation, of roughly 165 µm, on the sample's surface. If you are looking for high quality, high purity and cost-effective Hafnium carbide, or if you require the latest price of Hafnium carbide, please feel free to email contact mis-asia.

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