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碳化硅电热元件的化学性质 |
| 2011-3-27 |
| 1、元件的抗氧化性 Antioxidant property of elements 元件在空气中使用到800C时开始氧化，温度达到1000-1300C时结晶出方石英，在1500C时，保护膜达到一定的厚度，从而使元件的氧化速度变得极为缓慢，趋于稳定。如果继续升温至1627C以上时，则保护膜受到破坏，氧化速度显著增加，造成元件过早损坏。 The element start to being oxidized when heat to 800C in air，and a SiO2 protect film will be generated in surface of hot zone when temperature get to 1000-1300C ;cristobalite will be crystallized at 1300C; the protect film get to a certain thickness when the temperature get go 1500C which make the oxidation speed being very slowly to stable.if continue to heat to over 1627C ，the protect film will be damaged and oxidation speed will be more rapid evidently and make the element damaged earlier. 元件在使用过程中虽然氧化极为缓慢，但长时间运行仍然会导致电阻值增大，这种现象叫做老化。为了减缓老化速度，我们在制造过程中以独特的技术，在发热部的表面涂上了保护层，明显的增强了元件的抗氧化性能，延长了使用寿命。 Thought the element will be oxidized very slowly in course of application，it also will make the resistance increased following long time application，this phenonenon calls ageing ，in order to lower the ageing speed，we use special technology to spread a protect film on the surface of hot zone in the course of production，which enhance the Antioxidant property of element evidently and lengthen the service life. 2、碱和碱性金属氧化物对元件的影响 The effects of alkali and alkaline metal oxide to elements. 在1300C 左右，碱和碱性金属氧化物与碳化硅发生反应，生成硅酸盐，称为碱化学侵蚀，会明显影响元件发热的红热程度。 The alkali&alkaline metal oxide will react with SiC at about 1300C and generate silicate ，which calls alkali-chemical corrosion，and can influence the glowing of element. 3、熔化金属对元件的影响 The effects to elements from melting metal 部分金属如钴、镍、铬等在高温熔化状态可以对元件造成侵蚀，影响元件的寿命。 Some metals ，such as cobalt，nickel，chrome and so on ，can corrade the element in high temperature melting state and affect the service life of element. |
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