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Molybdenum Disilicide

Molybdenum Disilicide(MoSi2)EnoMaterial

Molybdenum Disilicide Powder 

1.The characteristics of Molybdenum Disilicide powder.

It is a cermet composed of one atom of molybdenum and two of silicon. It occurs as a dark gray, toxic powder. It is used, for example, in resistors and in advanced composite materials. Molybdenum disilicide (MoSi2) is also a refractory metal silicide that is primarily used as a heating element.  In recent years, its potential for use as a structural ceramic has been recognised, as the material combines excellent oxidation resistance and high elastic modulus at elevated temperatures.  These applications have been limited as MoSi2 is inherently brittle below 1000oC, and has poor creep resistance at temperatures above 1200oC. Consequently, workers have concentrated on improving these properties by combining MoSi2 with a second material in a composite. 

MoSi2 and associated composites are most commonly made by pressure assisted sintering techniques.  Hot pressing and hot extrusion produce simple shapes and are relatively economic.  Hot isostatic pressing produces complex shapes, with uniform density and grain structures, but is a more costly process.   Many other techniques such as reaction sintering, mechanical alloying and self propagating high temperature synthesis are being investigated, but have yet to demonstrated reproducibility and commercial viability.

Molybdenum disilicide has gained attention due to its attractive properties:

?         Moderate density

?         High melting point

?         Excellent oxidation resistance

?         High modulus at elevated temperatures.

Its use as a structural ceramic is limited by poor characteristics in two key areas:

?         Low toughness at temperatures less than 1000o C means that the material is very brittle at room temperature, and only becomes plastic at elevated temperature.

?         Poor creep resistance at temperatures above 1200o C. 

2.The applications of Molybdenum Disilicide powder.

Molybdenum disilicide is most commonly used commercially in electric heating elements.  The material has the potential to be used in high temperature structural components.
The attractive combination of oxidation resistance and high temperature elasticity makes molybdenum disilicide a most promising candidate for use in high temperature applications such as gas turbine engines.   Many investigators have worked to improve low temperature ductility and high temperature creep resistance.  However, they have yet to produce a commercially viable composite combining all the desired properties.

It is widely used In electrical resistors, In protective coatings at high temperatures, In engine parts in space vehicles, In coatings on refractories used in glass melters for better resistance to heat and corrosion. 

3. The specification of EnoMaterial's MoSi2 powder.



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4Qinhuangdao Eno High-Tech Material Development CO., LTD. specializes in the development, production, and sales ofSilicon Nitride (Si3N4), Aluminum Nitride (AlN), Titanium Nitride (TiN), Molybdenum Disilicide (MoSi2), Vanadium-Nitrogen alloy (FeVN) and other high-performance ceramic powders,In addition to,high thermal conductivity AlN substrates, AlN heat-dispersion sheet, and AlN crucible are also available. The products widely apply to the fields of electron, oil, metallurgy, mechanism, automobile, electrical station, environmental protection and aviation.

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