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Which of the following materials is widely used for high-temperature heating (1500 ┬░C) applications such as in industrial furnaces and kilns?
Stainless steel
Nickel chromium alloy
Bronze
Silicon carbide
Silicon carbide
Silicon carbide (SiC) is a non-metallic semiconductor material capable of operating at temperatures up to 1600 ┬░C. It is the standard choice for high-temperature industrial electric furnaces due to its high melting point and excellent thermal stability.
Silicon carbide (SiC) is a non-metallic semiconductor material capable of operating at temperatures up to 1600 ┬░C. It is the standard choice for high-temperature industrial electric furnaces due to its high melting point and excellent thermal stability.
P=I2├ЧR
R=╧БALтАЛ
Q=I2Rt
Silicon carbide heating elements work based on the principle of electrical resistance heating (Joule effect). As current passes through the rod, the material's inherent resistance converts electrical energy into heat. Unlike metallic elements, SiC exhibits a negative temperature coefficient of resistance at low temperatures, which becomes positive at high operating temperatures, providing a stable control profile.
Silicon carbide has a high oxidation resistance due to the formation of a protective SiO2тАЛ layer.
The material is brittle and requires careful handling compared to ductile metallic alloys.
Resistance of SiC increases with age, requiring voltage-regulating transformers for constant power output.
Suitable for oxidizing, reducing, and vacuum atmospheres.
High operating temperature up to 1600 ┬░C
High power density
Excellent resistance to thermal shock
Material becomes brittle over time
Resistance increases with service life (aging effect)
High electrical noise generation during operation
Industrial kilns and heat-treatment furnaces
Glass melting and ceramic sintering
Laboratory research furnaces
Option A (Stainless steel) is typically limited to below 900 ┬░C due to rapid oxidation.
Option B (Nickel chromium alloy) is excellent for domestic appliances up to 1100 ┬░C - 1200 ┬░C, but softens above this limit.
Option C (Bronze) is an alloy of copper and tin with a much lower melting point, unsuitable for high-temperature heating elements.
D is correct тАФ Silicon carbide is the standard material for heating applications requiring temperatures around 1500 ┬░C.
Always remember the temperature limits: Ni-Cr up to 1100 ┬░C, Fe-Cr-Al up to 1300 ┬░C, and SiC up to 1600 ┬░C. This hierarchy is a common subject for matching-type questions.
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