What is hafnium carbide?
Hafnium carbide usually with hafnium dioxide (HfO2) and carbon in the inert or reducing atmosphere synthesis powder, reaction temperature 1900 ~ 2300℃ hafnium carbide can form a solid solution with many compounds (such as ZrC, TaC, etc.).
How strong is hafnium carbide?
By analyzing the plastic deformation behavior of HfC under high pressure, its yield strength (~ 18 GPa) was obtained.
Is hafnium carbide toxic?
Acute and chronic effects:
In animal studies, hafnium chloride oxide is toxic through the peritoneal pathway…Carbides: Pure carbon has very low toxicity to humans and can be processed or even safely ingested as graphite or charcoal.
Hafnium carbide preparation
From hafnium or hafnium tetrachloride and methane in 2100℃ reaction or hafnium dioxide and carbon black in graphite crucible heating to 1900 ~ 2300℃ hydrogen. Or vapor of methane, hydrogen, and hafnium chloride passed through a heated tungsten wire.
Is hafnium carbide fragile?
Hafnium carbide is a dark gray brittle solid. It can be prepared by heating a mixture of these elements or by reacting hafnium tetrachloride with methane at 2100℃.
Hafnium carbide application
Can be used as carbide additives, widely used in the field of cutting tools and molds;2. Suitable for rocket nozzle material can be used in rocket nose cone parts, applied in the aerospace field, can also be used in the nozzle, high-temperature resistant Chemicalbook lining, arc or electrolysis electrode;3. For nuclear reactor control rod. Overview of hafnium carbide, physical and chemical properties, preparation methods, uses is edited by Ding Hong of Chemical book.
Hafnium carbide properties
Density 12.7g/cm3, melting point 3890℃, is known in the single compound with the highest melting point. Volume resistivity 1.95×10-4 ω ·cm(2900℃), thermal expansion coefficient 6.73×10-6/℃.Usually, with hafnium dioxide (HfO2) and carbon in the inert or reducing atmosphere synthesis powder, reaction temperature 1900 ~ 2300℃ hafnium carbide can form a solid solution with many compounds (such as ZrC, TaC, etc.).With a high melting point and high elastic coefficient, good electric conductivity, small thermal expansion, and good impact performance.
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