23
Zetasinter System
®
9.
MoSi2 Heating elements
In order to form a protective layer against oxidation, new heating elements must be heated to 1200°C
for 2 hours with a ramp of 3°C/min (cf 4. Assembling). This process should be done when using a Zetasinter
for the first time or after replacing the heating elements.
The resistance of MoSi2 heating elements increases with use and the performance of the furnace may
decrease. Used MoSi2 heating elements are very brittle, especially after heat treatment at 1200°C.
New and used MoSi2 heating elements can be used together.
Replacement
The power must be turned off before maintenance or inspection.
①
Unscrew the top cover and remove it.
②
Unscrew of the clip of the connection bridge (for each rods of the U type heating element) and remove it.
③
Take off the connection bridges
.
1)
2)
3)
④ Unscrew th
e clip from the ceramic jaws that hold the heating element.
⑤ Remove the ceramic jaws and the refractory b
lock.
⑥ Remove the heating element which needs to be replaces
⑦ Replace it with a new heating element. Replace the refractory block and ceramic jaws,
make sure they all
fit in the same position as before.
4)
5)
6)
7)
⑧ When tightening the clip screw, make sure that the
bottom of the heating element does not touch the
bottom of the furnace chamber.
⑨ Then follow the procedure④③②①to tighten the scre
w and complete the heating element
replacement.
