Molybdenum News Center

Properties: MoSi2 Mo-Si binary alloy is the highest silicon content system of an intermediate phase between the components is fixed daltons metal compound having the dual characteristics of metal and ceramic is an excellent material for high temperature . Excellent high temperature oxidation resistance, anti-oxidation temperature up to 1600 ℃, and SiC considerable; has a moderate density (6.24g/cm3); low thermal expansion coefficient (8.1 × 10-6K-1); good electric conductivity sex; higher brittle-ductile transition temperature (1000 ℃) or less like a brittle ceramic. Above 1000 ℃ was soft metal like plastic. The main application for MoSi heating elements, integrated circuits, high temperature oxidation resistant coating and high temperature structural materials. 

 

U-type silicon molybdenum rod is MoSi2 heating elements, the most commonly used specifications, the electric devices by supporting Chuck hung vertically installed the component, to avoid mechanical stress applied to the heating element end, otherwise easily lead to fracture components . 

 

Continuous operation: MoSi2 high temperature for long continuous operation, the surface film gradually evaporated, so that the surface of the rod from the inside to the thermodynamic equilibrium composition, when the concentration gradient is insufficient to form the silicon surface with the lowest silicide, molybdenum oxidation volatilization free and a protective film is formed of quartz glass in the new interface of molybdenum silicide, and so continue to volatilize raw film, thin member is constantly reduced until the local minimum cross-section of the blown overload failure. This is mainly in the form of a continuous furnace failure silicon molybdenum rods. 

 

Working gap: U-shaped quartz glass film on the surface of MoSi2 heating and cooling process of the thermal stress, cracks caused by the thermal expansion and contraction, caving, thinning, cracks and caving in the re-forming a new surface film , there appears a pit below the surface of the element, by alternating the surface of a certain number of elements with a diameter of 1; 2mm, depth 0.2; continuous Pock 0.5mm, the minimum cross-section of the final overtemperature blown. This is mainly in the form of a gap furnace failure. 

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