MolyCom®-Ultra0 pages

â

MolyCom

Molybdenum Disilicide
Electric Heating Elements
up to 1,800°C
®

®

MolyCom -Ultra & MolyCom -Hyper electric heating elements
are dense cermet materials, mainly composed of MoSi2
(molybdenum disilicide) and some ceramic components. Above
900°C service temperature the surface will form a protective high
®
temperature layer of pure quartz, which gives the MolyCom ®
Ultra & MolyCom -Hyper material a high resistance to oxidation.
If this glassy phase should be exposed to contaminants, a lower
melting phase forms. This material literally drips off the element
exposing more molybdenum disilicide on which a new protective
®
oxide layer forms. MolyCom -Ultra & -Hyper elements become
somewhat ductile at approximately 1,200°C.
®
®
MolyCom -Ultra & MolyCom -Hyper elements may be used up
to a surface temperature of 1,800°C in oxidizing atmospheres.
Long service life and ease of replacement contribute to high
furnace utilization and low maintenance costs.
New and old elements can be used together and in series.
®
MolyCom -Ultra & -Hyper elements are manufactured according
to established industry standards. The elements can also be
used in combination with other molybdenum disilicide elements
as an alternative or replacement part.
At low temperatures, an oxidation of molybdenum and silicon on
the surface of the elements can occur at temperatures of around
550°C. The oxidation product is a yellowish powder known as
„pest“ and has normally no detrimental effect on the performance
®
of MolyCom -Ultra & -Hyper elements because the material is
dense.
®

The MolyCom -Hyper heating elements have a high purity glassy
silica layer and this layer works as an oxidation protection layer
with very low oxidation permeability. Therefore the heating
elements show less deformation, an excellent low temperature
oxidation (“pest”) resistance and long life use.
The High-Purity and No-Pest Grades are available in 3/6, 4/9
and 6/12 mm at a maximum temperature of 1,800°C.