Home > Knowledge > Content
Metal glaze resistor
Oct 13, 2017

Metal glaze resistor

Metal glaze resistor definition

The metal glaze resistor is a type of fixed resistor, which uses glass powder and metal particles (silver and palladium) mixture to restrict the flow of electric current to certain level.

What is metal glaze?

Metal glaze refers to the metals, which looks shiny because of the glass powder and the metal particles mixture. The resistors that are made from the metal glaze are called metal glaze resistors.

Metal glaze resistor construction

The film of the metal glaze resistor is constructed by using the glass powder and metal particles mixture. This mixture is then deposited on a ceramic substrate.

The combination of film and substrate is heated at 800°C. Because of this extreme heat, the glass powder and the metal particles are joined with the substrate. As a result, a thick layer is formed on the substrate. This layer is nothing but the thick film of metal glaze resistor.

The film made of glass powder and metal particles mixture acts as the resistive element to the electric current. Hence, the metal glaze film restricts the electric current to certain level. The resistance of the metal glaze resistors ranging from 100kΩ to 100MΩ.

In the metal glaze resistor, the desired resistance is achieved by cutting the metal glaze film in a helical manner along its length. Once the desired resistance is achieved, the cutting of metal glaze film is stopped.

The film of the metal glaze resistors is very thick. Hence, they operate at high surge current. A sudden rise of the electric current is called high surge current. The film of the metal glaze resistors is much thicker than the metal film and carbon film resistors.

未命名1507598229.png

The resistance of the metal glaze resistor is depends on the amount of metal and glass added

Metal glaze film with higher amount of metal particles and lower amount of glass provides low resistance to the electric current. Hence, a large amount of electric current flows through the metal glaze resistor.

Metal glaze film with higher amount of glass and lower amount of metal particles provides high resistance to the electric current. Hence, only a small amount of electric current flows through the metal glaze resistor.

Metal glaze resistors have low temperature co-efficient of resistance

The rate at which the resistance of the material changes with increase in temperature is called temperature co-efficient of resistance.

Metal glaze resistors have low temperature co-efficient of resistance. Hence, the resistance of the metal glaze resistors does not change easily with increase in temperature.

Advantages of metal glaze resistors

Low TCR (Temperature Co-efficient of Resistance).

High stability.