Molybdenum disilicide is an inorganic compound with the chemical formula MoSi2, which is a gray metallic solid. It is insoluble in most acids, but soluble in nitric acid and hydrofluoric acid. The radii of the two kinds of atoms are not much different, the electronegativity is relatively close, and they have properties similar to those of metals and ceramics. Molybdenum disilicide is conductive and can form a passivation layer of silicon dioxide on the surface at high temperatures to prevent further oxidation. It is used in the fields of high-temperature anti-oxidation coating materials, electric heating elements, integrated electrode films, structural materials, composite materials, wear-resistant materials, structural ceramic connecting materials and other fields.
The physical and chemical properties of Molybdenum disilicide
Molybdenum disilicide MoSi2 is the mesophase with the highest silicon content in the Mo-Si binary alloy system. It is inter daltons metal compound having a fixed composition. With the dual characteristics of metal and ceramics, it is a high-temperature resistant material with excellent performance. Excellent high-temperature oxidation resistance, the oxidation temperature is as high as 1600℃, which is equivalent to silicon carbide with medium density (6.24g/cm3) and low thermal expansion coefficient (8.1×10-6K-1). Molybdenum disilicide having good electrical conductivity and thermal conductivity; having ceramic-like high hardness and brittleness in the brittle-ductile transition temperature (1000 ° C) or less. Above 1000℃, it is metallic, soft and plastic. MoSi is mainly used as heating elements, integrated circuits, high-temperature anti-oxidation coatings and high-temperature structural materials.
Application of molybdenum disilicide in electric heating products
U-silicon-molybdenum disilicide heating rod
The U-shaped molybdenum disilicide heating rod is the most commonly used specification in the electric heating element of the molybdenum disilicide heating rod. In electric heating equipment, the components are vertically suspended and installed through the support chuck to avoid adding mechanical stress to the heating end of the component, otherwise, it is easy to cause the component to break.
Continuous operation
Silicon-molybdenum disilicide heating bars work long hours at high temperatures, the film surface is gradually evaporated and the rod from the inside to the table occurs thermodynamic phase equilibrium. When the concentration gradient of surface silicon is not enough to form the lowest silicide phase, oxidation and volatilization of free molybdenum will occur, and a quartz glass protective film will be formed on the new molybdenum silicide interface. In this way, volatilization and film formation continue, and the components continue to decrease until the local minimum cross-section is overloaded and burned out. This is mainly silicon molybdenum disilicide heating rod failure modes in a continuous kiln.
Molybdenum disilicide supplier
As a global Molybdenum disilicide boride supplier, Tanki New Materials Co., Ltd. has extensive experience in the performance, application and cost-effective manufacturing of advanced engineering materials. The company has successfully developed a series of powder materials (titanium nitride, silicon nitride, titanium nitride, etc.) high-purity targets, functional ceramics and structural devices, and provides OEM services. For the latest price of Molybdenum disilicide boride, send us an email or click on the needed products to send an inquiry.
