Properties and Uses of Molybdenum Disilicide

What exactly is molybdenum-disilicide?

It is a crystal of molybdenum silicicide (MoSi2) with a tetragonal arrangement. It’s an intermediate phase that contains the most silicon of the Mo-Si binary alloy. It’s a Dalton intermetallic compounds with a fixed structure. It’s grayish with metallic luster. It exhibits excellent electrical and thermal conductivity as well as outstanding mechanical properties. It is a good heating element, with a better performance than silicon caride. Early applications included a corrosion-resistant, high-temperature coating protection material for metal substrates. This was used to coat parts of jet engines, gas turbines, and missile combustion chambers. Today, molybdenum is used in high-temperature heating elements as well as thermocouple protection tubes.

Molybdenum silicide properties:

Crystallographic properties The pure molybdenum-dilicide is stable thermally and does not experience any phase change prior to reaching its melting point. Changes in crystallographic properties will not affect the temperature rise or fall within the limits of the effective temperature range.
You can find the following thermodynamic properties in your home: low melting points (similar to SiO), high thermal conductivity and a small thermal expansion coefficient. These properties are essential for producing high-temperature heating elements and thermocouple protector tubes. They also help increase thermal shock resistance.

The material has excellent electromagnetic properties, including low resistance (2×10-5O*cm), high electricity rate and a good conductor. This material is excellent for making heating elements and thermocouple thermoelectrodes.
Mechanical properties. The tensile strengths and bending strength of some general metal materials are the same as those of certain oxide materials (such Al2O3). Hardness and compressive strength, however are greater than for metals. It has poor impact toughness which is a disadvantage to metals. To make cermet, some metal bonds are added to the material during the manufacturing process. However, this is only for the purpose of protecting the product’s high-temperature resistance against oxidation.
Chemical properties It can be dissolved in all acids and alkalis, even at room temperature. MoSi2, except for oxide ceramics is the most stable refractory chemical. The molybdenum’s solubility in silicon is approximately 1% (1800degC), which determines MoSi2 oxidation stability temperatures below 1700degC.
Molybdenum Disilicide by itself is not highly resistant to oxidation at high temperatures. But, at 1300 1600°C, a protective thin layer of silicon dioxide is created on its surface. This protects against further oxidation. MoSi2 not only is stable in oxidizing mediums, but can also be used at high temperatures for reducing, neutral and inert atmospheres. In N2, CO2, and SO2 media, for example, 1600 can be achieved.

Mollybdenum disilicide uses:

According to current statistics, molybdenum silicide is the most popular silica product and has the greatest industrial production. The main products of this silicide are thermocouple protection tubes and high-temperature heat elements.

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