The erosion of matched fixture to molybdenum disilicide heating element at high temperature is a common problem, which may lead to the shortening of the lifespan and the degradation of the performance of molybdenum disilicide heating elements.
![mosi2 heating element fixture](https://sicelement.com/wp-content/uploads/2023/07/mosi2-heating-element-fixture.jpg)
To solve this problem, there are several methods as follows:
- Choose suitable ceramic materials, reduce their thermal expansion coefficient and thermal conductivity, and decrease the thermal stress and thermal contact with molybdenum disilicide.
- Optimize the structure and shape of ceramic fixtures, increase the gap between them and silicon molybdenum rods, and avoid too tight or too loose clamping.
- Check and replace ceramic fixtures regularly, find and eliminate defects such as cracks, deformation, looseness, etc. in time.
- Control the heating temperature and time, avoid too high or too long heating, and reduce the oxidation and embrittlement of molybdenum disilicide heating elements.
- Apply a layer of anti-corrosion lubricant or protective coating between ceramic fixtures and molybdenum disilicide heating element , such as boron nitride, alumina, etc., to reduce the friction and reaction between them.
- In the furnace design, try to keep the temperature of the top part of the furnace low.