Applied products: Insulated Coil Heaters - Heanjia Super-metals Co., Ltd.

Electrical heating elements News

Applied products: Insulated Coil Heaters

Pyromax-DS is a coil heater materials with special insulation processingon the surface and may be used where coil wires are in close contactwith each other. In conventional heater designs, a pitch of twice or moreas large as the heating element diameter has been required in order toprevent the contact of coil wires. Our insulated coil heaters may be usedin close contact conditions.

1. Characteristics of insulation film

1) Composition

The insulation film is made of alumina (Al₂O₃) featuring superiorinsulation characteristics. It is not made by coating but by condensingaluminum, one of the components of the base material alloy of Pyromax, and oxidizing it on the surface. (Patent pending) It hassuperior adhesion.

2) Insulation characteristics

The wire-to-wire withstand voltage is 1 V at a coil heater temperatureof 800ºC and 0.5 V at 1000ºC. The coil heaters may be used free fromproblems in this range.

3) Secular changes

As use continues, the insulation characteristics of the film increase. Whenthe coil heater is used at high temperature, aluminum, one of the basecomponents of Pyromax, diffuses to the surface and grows graduallythrough selective oxidation, and the film accordingly becomes thicker.

2. Applications and advantages

1) Long lifetime

In conventional coil heater designs, a pitch of twice or more as large as the heating element diameter has been required, and restrictions havebeen placed upon wire diameters (i.e., impossibility of using large diameter wires). Furthermore, there was a drawback that if the pitchchanges during operation, the parts with irregular pitches overheat anddeteriorate quickly, resulting in variances in the service life. When aninsulated coil heater is used, the coil pitch may be reduced and largersize heating wires may be used, resulting in a prolonged lifetime andstable operations.

2) Compact size

Since larger size wires may be used rather than conventional heating elements, coil heater space may be reduced without reducing lifetime.

3) Vertical use of coil heaters

There was no other way than winding coil heaters around insulatorswhen using conventional coil heaters vertically. Insulated coil heatersmay be used vertically in close contact conditions.

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