What are the materials for thick film power resistors

The main materials for thick film power resistors include conductor powder, glass powder, organic carriers, and other possible additives. The following is a detailed analysis of these materials:

Conductor powder:
Conductor powder is the main conductive component that constitutes resistance. In thick film resistors, commonly used conductor powders include metal oxides such as ruthenium oxide. These metal oxide particles will form a chain like structure during the sintering process, embedded in the glass matrix, thus constituting the main part of the resistor.
Glass powder:
Glass powder plays a role in bonding and insulation in thick film resistors. It can melt during the high-temperature sintering process, sinter the conductor powder particles together, and form a stable resistance structure. Meanwhile, glass powder can also provide the mechanical strength and hardness required for resistors.
Organic carrier:
Organic carrier is an important component of thick film resistor paste, mainly used to carry and disperse conductor powder and glass powder for printing and forming. During the high-temperature sintering process, the organic carrier will evaporate, leaving behind a resistance structure formed by the conductor and glass.
additive:
Additives may include various substances used to adjust resistance properties, such as changing resistivity, improving stability, and enhancing sintering performance. The specific types and amounts of these additives will vary depending on the design requirements and application scenarios of the resistor.
In addition, the manufacturing process of thick film power resistors may also involve other auxiliary materials, such as substrate materials (such as alumina ceramics, glass ceramics, etc.), protective layer materials (used to protect resistors from environmental factors), etc. The selection of these materials will also be considered based on specific application requirements and manufacturing costs.

Overall, the material selection of thick film power resistors is a complex process that requires comprehensive consideration of multiple factors such as resistor performance requirements, manufacturing costs, and application scenarios. Different material combinations and manufacturing processes can produce thick film resistors with different characteristics and application ranges.