2.化学性质 Chemical property
高温抗氧化性：高温氧化气氛下，元件的表面生成一层致密的石英(sio2）保护层以防止Mosi2继续氧化。当元件保护层熔融，由于表面的张力的作用，sio2熔聚成滴，而失去保护作用。元件在氧化气氛下，再继续使用时，sio2保护层重新生成。
Oxygen-resistance under high temperature: in oxidizing atmosphere，on the surface of element owing to the high-temperature combustion a layer of compact quartz(sio2)protective film is formed to prevent Mosi2 from continuously oxidizing.When the element temperature is higher than 1700℃，the sio2 protective film， Whose fusing point is 1710℃， is fused，and the sio2 is fused into molten drops owing to the action of its surface extension， so that loses its protective ability，In the oxidizing atmosphere，when the element is continuously used，again the protective film forms. 必须指出的是元件不宜在400-700℃范围内长时间使用。否则元件会因低温的强烈氧化作用而粉化。
It should be pointed out that element cannot be used for rather long time in 400-700℃，ot it will be powdered owing to the strong oxidizing action in low temperature.
3.不同气氛对元件温度的影响
The Max temperature of elements in different atmospheres
气氛Atmosphere
最大元件温度 Max element temperature
Songshan Super MS17
Songshan Super MS18
空气Air
1700℃
1800℃
氮气Nitrogen
1600℃
1700℃
氩气Argon，氦气Helium
1600℃
1700℃
氢气Hydrogen
1100~1450℃
1100~1450℃
N2/H295/5%
1250~1600℃
1250~1600℃
应用领域
General applications
主要用于工业热处理炉、烧结炉、铸造炉、玻璃熔化炉、冶炼炉等
Most types of industrial furnace for heat treatment，forgoing，sintering，glass melting and refining and for use in radiant tubes
主要用于实验炉、测试设备和高温结炉等
Laboratory furnaces，testing equipment and high temperature sintering production furnace
必须指出的是元件不宜在400-700℃范围内长时间使用。否则元件会因低温的强烈氧化作用而粉化。