The conductive material of conductive sliding ring not only has good conductivity, but also has high strength, hardness, heat resistance, corrosion resistance and wear resistance. Therefore, conductive copper alloys, silver alloys and composite metal conductors for different purposes have developed rapidly. Composite conductors made of two or more different metals have many unique advantages: high strength, high hardness, high elasticity, good wear resistance, heat resistance, corrosion resistance and thermal conductivity, special magnetism and thermal expansion coefficient. Next, we will analyze the common conductive materials of several conductive sliding rings.
1、Copper and its alloys are the most commonly used conductive metals. Precious metals and other metals are also used in some special occasions. Copper is the earliest widely used conductive material with good conductivity and mechanical properties.
2、Silver and its alloys are the most important electrical contact materials for precious metals of conductive sliding rings. They are inexpensive and most widely used. Silver has excellent electrical conductivity, thermal conductivity and oxidation resistance, and its processing performance is good. However, the strength and hardness of silver alloys are low, wear resistance is poor, and vulcanization is easy. These shortcomings of silver can be overcome by adding appropriate elements. Silver alloy can be used to make conductive rings with stable contact resistance for occasions where conditions are not very high.
The chemical stability, electrical conductivity and thermal conductivity of gold are very good. The contact resistance of the contact material is low and stable. The disadvantage of gold is its poor elasticity, low yield point and easy welding. Silver, copper, platinum, palladium and other elements are often added to make alloys to improve the electrical contact properties of gold. Gold-based electrical contact materials are often used as precise electrical contact materials under low contact load and low current.