Parts for Oven - Mosi2 Heating Elements Replacement for VITA ZYRCOMAT 6000 MS

MoSi2 Heating Elements Properties

1,Physical properties

2.Chemical properties:

High temperature antioxidant property:
At a high temperature oxidizing atmosphere, a dense quartz SiO2 protect layer will be generated in the surface of the hot zone to prevent the element from further oxidation. When the temperature is higher than 1700C, the protection layer would be melt. Due to the effect of surface tension, quartz agglomerating into drops, and loses the protection. Then continue to use in the oxidizing atmosphere, the quartz protection layer again generate.

Note: the element can’t be used for a long time in the temperature range of 400C to 700C, otherwise it will be strongly oxidated and damaged

3.The influence of the different atmosphere

MoSi2 Heating Elements Advantages:

• The Mosi2 heater has the function of antioxidant and auto repair, and suitable for different kinds of continuous working during the oxygen atmosphere.
• Molding by heat process and model size is standard, so we can produce special shapes and sizes according to customer requirements.
• Adopt a special process for joint molding with fasten welding and strong impact resistance.
• High density and excellent electrical conductivity, high heating rate, and low power consumption.
• The old one and the new one could be used together.

1,Vertically Hanging

Under normal temperature,Mosi₂element is very brittle,while under high temperature it is plasticity.so,the better way for installation of the U Shape element is to hang it vertically to the furnace top by the element holder.Such way is to avoid putting the mechanical stress directly to the element heat-generating end,otherwise,the element will easily be broken.

2,Element holder

The element holder supports the whole weight of the element and the position of the element is also determined by it.Therefore,it must be installed carefully to assure that the element is vertically hung. When install the element,don't fix the strap too much at one time,it can be tightened when the element rises to high temperature,as the element has some plastic and isn't easily broken. The temperature of the wire clip generally shouldn't be higher than 200℃. Therefore,the contact voltage between the clip wire and element should be lowered to 0.1V. In order to avoid that the radiation heat is conducted to the clip,the distance between the lower end of the clip and upper surface of the through brick should not less then 50mm. Generally for Φ6/12 element, 170A should not be used long time and for φ9/18 element, 300A shouldn't be used for long time. In order to prevent the element from being over heated locally,the taper part of the element lower end must put into the furnace chamber.

3,Connection strap

The connectionstrap is made of aluminum braid strap or multi-layeraluminum foil.The outside clamp isn't used for electrical conduction.The end of strap contacts bus,and the length of strap should be a little larger than the linear distance between the element and bus.