For high temperature furnace elements to be used in oxidizing environments, molydisilicide heating elements are commonly employed. These elements are particularly suitable for such environments due to their ability to quickly attain and sustain high temperatures and their affinity for oxidizing atmospheres.
Molydisilicide Heating Elements: Molydisilicide heating elements consist of a molybdenum core coated with quartz glass. This design allows them to operate effectively in air, which is an oxidizing environment. As the elements heat up, they become nearly liquid as they approach their maximum temperature, which is typically 100°C higher than the maximum rated furnace temperature. The glass surface of the element reacts with the oxygen in the air to form a renewed coating of protective glass on the element surface, which helps in maintaining the integrity and functionality of the element.
Operational Considerations: These elements are designed for maximum operating temperatures in the range of 1500-1800°C and are used in furnaces that operate in air. For operations in inert atmospheres, adjustments are necessary. This might involve using a higher temperature element or restricting the maximum furnace operating temperature to accommodate the limitations of the heating element.
Importance of Atmosphere: The choice of heating element is heavily influenced by the atmosphere in which the furnace operates. In oxidizing environments, materials that can tolerate elevated temperatures in the presence of oxygen are preferred. Molydisilicide elements are an excellent choice in such scenarios due to their robust performance and self-renewing protective coating.
In summary, molydisilicide heating elements are the preferred choice for high temperature furnaces operating in oxidizing environments due to their high temperature capabilities and their ability to form a protective oxide layer, which enhances their durability and effectiveness in such conditions.
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