Introduction to the requirements and characteristics of electrothermal materials used in plastic granulators

Introduction to the requirements and characteristics of electrothermal materials used in plastic granulators

Requirements for electrothermal materials

For materials used as electric heating elements (such as heating coils) (such as resistance wires), the following requirements should be met:

1 has a relatively high resistivity ρ, the larger the resistivity, the more material used, the smaller the component volume.

2 There is a small temperature coefficient of resistance αt, the smaller the temperature coefficient of resistance, the easier the temperature will remain stable.

3 has sufficient heat resistance, that is, it does not degrade or oxidize at high temperatures.

4 should have sufficient mechanical strength when the temperature is high or the temperature changes rapidly.

5 must be easy to process, can change the shape and welding in the cold state.

(2) Types and characteristics of electrothermal materials

There are many types of materials that can be used as electrothermal materials. However, the widely used resistor heating coils are chrome-nickel electrothermal alloys and iron-chromium-alloys. Compared with the two alloys, the advantages of iron-chromium-aluminum are more. Such as:

1 The use temperature is high.

2The coefficient of resistance is large.

3 The temperature coefficient of resistance is small.

4 The specific gravity is small.