Which of the following materials is widely used for high-temperature heating (1500°C) applications such as in industrial furnaces and kilns?

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  1. Nickel chromium alloy
  2. Bronze
  3. Stainless steel
  4. Silicon carbide

Answer (Detailed Solution Below)

Option 4 : Silicon carbide
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For high-temperature heating applications, such as those in industrial furnaces and kilns that reach temperatures around 1500°C, Silicon Carbide (SiC) is widely used.

  • Silicon Carbide (SiC): It is a ceramic material that can withstand extremely high temperatures, making it ideal for applications in furnaces and kilns where temperatures reach up to 1500°C or even higher. It also has excellent thermal conductivity and resistance to thermal shock.
  • Nickel-Chromium Alloy (NiCr): While nickel-chromium alloys are also used in heating applications, they are typically used for lower temperature ranges, generally up to around 1200°C.
  • Stainless Steel: Stainless steels are generally not used for heating elements in such high-temperature applications because they lose their mechanical properties and become prone to oxidation at temperatures above 800-1000°C.
  • Bronze: Bronze is not suitable for high-temperature heating applications as it has a relatively low melting point compared to the other materials listed.

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