Properties and Uses of Molybdenum Disilicide

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What is molybdenum Disilicide (Molybdenum Diilicide)?

The crystal structure of Molybdenum Disilicide is tetragonal. It is the phase of the Mo-Si binary alloy with the most silicon. It is a fixed-composition Dalton intermetallic. It is gray and has a metallic sheen. It is highly conductive, both electrically and thermally. It also has excellent mechanical characteristics and resistance to high temperature oxidation. It has a higher performance than silicon carbide and can be used to heat a metal substrate. The first application of this material was to protect metal surfaces from corrosion and heat at high temperatures. The coating was used on gas turbine components, jet engine combustion rooms and missile combustion cells. Today, molybdenum-disilicide is used primarily in high temperature heating elements and thermocouple tubes.

Molybdenum diilicide properties

Crystallographic properties It is a tetragonal crystalline structure, with a densities of 5,9-6.3g/cm. Pure molybdenum is stable at high temperatures and does not phase change until it reaches its melting point. Changes in crystallographic property will not affect the temperature change within its maximum effective temperature range.

Thermodynamic properties include melting points up to 2030degC and high thermal conductivity. These are the necessary characteristics for high-temperature heaters or thermocouple tubes. They can also increase their thermal shock resistance.

This material has excellent magnetic properties, including low resistivity (2×10-5O*cm), a high electric rate and a good conductor. This material can be used to manufacture heating elements, thermocouple electroelectrodes or temperature protection tubes.

Mechanical properties are: the tensile and bending strengths are similar to those of metals, as are some oxide materials such as Al2O3. The hardness and compression strength are also superior. The biggest disadvantage of metals is their poor impact resistance, which makes them brittle materials like general ceramics. To make cermet, the metal bond is added to the ceramic material in a very small amount, while ensuring that it does not affect its high temperature oxidation resistance.

The chemical state of the substance is acidic. At room temperatures, it is not soluble with the majority of acids and alkalis. MoSi2 is most stable refractory material, with the exception of oxide ceramics. MoSi2 has a lower oxidation stability below 1700degC because silicon is only 1% solubilized in molybdenum (1800degC).

Molybdenum Disilicide does not resist high temperature oxidation. However, at temperatures between 1300 and 1600degC a glassy layer of dense silicon dioxide forms on the surface, which inhibits continued oxidation. MoSi2 has a high temperature range and is stable not only in an oxidizing medium, but can also be used in reducing media, neutral atmospheres, inert atmospheres and in some very strong corrosive environments. In N2, CO2, So2 and other media the maximum temperature can be 1600.

Uses for molybdenum Disilicide

Molybdenum Disilicide is the silicide with the highest industrial production. Its main products include high-temperature heating tubes and thermocouple protector tubes.

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