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 able to be used as an heating element, and it performs much better 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 engine combustion chambers, gas turbine parts, and missile combustion chambers. Today, molybdenum is used in high-temperature heating elements as well as thermocouple protection tubes.
Molybdenum deicide properties:
Crystallographic properties The pure molybdenum-dilicide is stable thermally and does not experience any phase changes 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: high melt point of up to 2030°C and thermal conductivity similar to SiO. 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 compound. The molybdenum’s solubility in silicon is approximately 1% (1800°C), which determines MoSi2 oxidation stability temperatures below 1700°C.
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,SO2 or other media, 1600 is possible.
Mollybdenum disilicide uses:
The most popular silicide product and the one with the greatest industrial production at the moment is molybdenum. Its major products are thermocouple protection tubes and high-temperature heat elements.
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