Properties and Uses of Molybdenum Disilicide

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 has excellent electrical and thermal properties, good mechanical properties, and high temperature resistance. 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. It was used as a coating 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 general metals, as well as some oxides materials (such Al2O3). The hardness and compression strength are also superior to that of metals. 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.

Chemical properties: the chemical state is an acidic. 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 oxygenation. But at 13001600degC it forms a glassy, dense layer of silicon oxide on its surface that inhibits further oxidation. MoSi2 has a high temperature range and is stable not only in an oxidizing medium, but can also be used in neutral, inert or strong corrosive environments. In N2, SO2, CO2, etc., 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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