You will find brief explanations on important technical terms from the area of high-temperature technology in our glossary.
Heating elements of molybdenum disilicide (MoSi2) are usually used at application temperatures starting at 1200°C. Depending on the production process of a product, however, hold times at low temperature ranges up to approx. 700 C are necessary, where the heating element may disintegrate into a powder. This effect is called „MoSi2-Pest“. We have developed a special heating element quality to prevent this reaction. MolyCom®-Hyper 1800AP provides an "anti-pest" heating element that is oxidation-resistant in the temperature range of 200°C to 700°C.
Electrical high-temperature furnaces with MoSi2 heating element may be operated under different process atmospheres such as air, nitrogen (N2), argon (Ar), helium (He) or hydroxide (H2). The highest possible application temperature can be reached under air atmosphere. MoSi2 heating elements are also used successfully in the other atmospheres named, under consideration of the recommended maximum element temperatures, however.
The insulation of polycrystalline mullite/alumina wool (PCW) can be used in other atmospheres as well. Furthermore, process temperature control rings PTCR can be used deviating from the standard atmosphere (air) under vacuum or reducing conditions such as N2/H2-mixtures. For this, we recommend pre-firing the PTCR, except for types MTH and HTH, at 600°C for 2 hours, in order to evaporate the organic binder. We will gladly perform pre-firing for you if you wish.
The term of application temperature is often replaced by furnace temperature or operating temperature in practice. The application temperature is the temperature at which our products, components and systems can be operated permanently under consideration of operational influences. It considers influences that occur in practice, such as atmospheres, hold times and the maximum temperature at which the furnace is operated. This is countered by the classification temperature for insulation material and the element temperature for heating elements.