Molybdenum disilicide heating elements

Borides and Silicides. These materials do not show good resistance to oxidation. Some silicides, however, form Si02 coatings upon heating which retards further oxidation. Molybdenum disilicide [1317-33-5]> MoS, is used widely, primarily as an electrical heating element. 

Many metals form conductive silicides, which, like SiC, are resistant to oxidation through the formation of stable passivating layers of silicates or silica on their surfaces at high temperatures. Molybdenum disilicide (MoSi2) has been developed as a heating element for use in air at temperatures above 1500 °C. Its resistivity behaves as is expected for a metal, increasing from about 2.5 x 10-7 fim at room temperature to about 4 x 10-6 Qm at 1800 °C. 

Both metals are inert to oxygen at ordinary temperatures, but at red heat they combine with it readily to give the trioxides. They both combine with chlorine when heated, but even at room temperature they are attacked by fluorine, yielding the hexafluorides. The metals also react on heating with B, N, and Si. Molybdenum disilicide (MoSi2) is used in resistance heating elements, and WC is used to tip cutting tools. 

Molybdenum disilicide is made by direct synthesis of elements in a powdered mixture. Forming (e.g. from plastic mass containing an organic plasticizer) is followed by sintering at 1600—1700 °C the last stage of sintering may be effected by direct resistance heating. 

Molybdenum disilicide is utilized for the manufacture of electrical heating elements, which can be operated in air at temperatures up to 16()0°C... 

Molybdenum disilicide stands out and is utilized in electrical heating elements, which can be operated at temperatures of up to 1600°C in air due to the formation of Si02 layers on surface. 

Molybdenum disilicide (MoSi2), an intermetallic compound, a silicide of molybdenum, is a refractory ceramic primarily used in heating elements. It has... 

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