Materials that are resistant to extreme heat include tantalum carbide, hafnium carbide, molybdenum, tungsten, steel, graphite, ceramics, silicon carbide, and refractory metals such as molybdenum, tungsten, and tantalum. Tantalum carbide and hafnium carbide can withstand temperatures of nearly 4000 degrees Celsius. Molybdenum can be used up to 1700°C (3100°F) and is commonly used in moderate temperature heat treatment processes. Tungsten can be used up to 2,500 °C (4,532 F) and is suitable for sintering and heat treating carbon-sensitive materials. Steel is suitable for temperatures below 1,000 °C (1,832 F). Graphite can withstand temperatures up to 3,000°C and is used for high-temperature sintering and heat treatment. Ceramics provide thermal insulation and can be used in hybrid hot zones. Silicon carbide is used as a resistor material for temperatures up to about 1,500°C. Refractory metals like molybdenum, tungsten, and tantalum are resistant to wear, corrosion, and deformation and can be used in vacuum furnaces.
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