Furnaces from Deltech have an optimum operating temperature range of 1500 °C to 1800 °C and are designed for operation in air.
As a result, it is preferential to use molydisilicide heating elements as they are capable of reaching and maintaining elevated temperatures rapidly. They also show affinity for oxidizing environments.
Molydisilicide Heating Elements
Molydisilicide heating elements (Figure 1) have a robust appearance but are made from a glass-like material which is fragile and has a low mechanical shock resistance.
Quartz glass is used to coat the molybdenum core. While approaching the optimum temperature, the elements reach a nearly liquid state and a renewed coating of protective glass is formed on the element surface due to reaction between the glass surface and the oxygen in the air atmosphere.
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Figure 1. Inert atmosphere batch melt furnace featuring robotic operation and featuring molydisilicide heating elements. Image credits: Deltech Furnaces, Inc.
The optimum element temperature is always higher than the optimum rated furnace temperature by 100°C. For instance, 1700°C furnaces use 1800°C heating elements.
The application of a higher temperature element or a limitation on the optimum furnace operating temperature to handle element limitations is required for operation in inert atmospheres. For instance, 1800 °C heating elements are used for 1600 °C operation in argon.
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This information has been sourced, reviewed and adapted from materials provided by Deltech, Inc.
For more information on this source, please visit Deltech, Inc.