碳化硅电热元件具有较大的比电阻，在空气中加热，元件发热部表面温度达到1050℃左右时，电阴率为600--1400 mm2/mm.元件的电阻值随着温度的升高而变化，从室温到800℃为负值、800C以上为正值特性曲线。

　　 SIC heating elements has rather large specific resistance .when it is heated in air and the surface temperature of the hot zone reaches 1050℃，it's resistance rate is 600-1400 mm2/mm ，its resistance value changes as the temperature rises.From room-temperature to 800℃ is negative value ，over 800℃ is positive value nature curve.