There are a large number of charged particles that can move freely under the action of electric field, so they can conduct current well. Including conductor materials and Superconductive material 。 In the field of electrical engineering, conductive materials usually refer to resistivity of (1.5~10) × 10 -8 Omi's metal. Its main function is to transmit electric energy and electrical signals. In addition, it is widely used for electromagnetic shielding , manufacturing electrodes, electrothermal materials, instrument shells, etc. (when there are electromagnetic shielding and safety grounding requirements). With the development of science and technology, its use is still increasing. Conductive materials used in the electrical field shall have high conductivity, good mechanical and processing properties, and be resistant to atmospheric corrosion, chemical stability High, but it should also be rich in resources and low in price. Aluminium silver plating Conductive rubber : Excellent shielding performance and smoke resistance; Nickel coated graphite conductive rubber: excellent conductivity, electromagnetic shielding and corrosion resistance
Copper silver plated conductive rubber: with the best conductivity;
Silver plated glass conductive rubber: with the best cost performance;
Sterling silver conductive rubber: It has good mildew resistance.
Conductive materials used in the electrical field should have high conductivity, good mechanical and processing properties, atmospheric corrosion resistance, high chemical stability, and rich resources and low prices
Commonly used metal conductive materials can be divided into four categories: metal elements, alloys (copper alloys, aluminum alloys, etc.), composite metals, and other conductive materials for special purposes that do not take conductivity as the main function:
① Metal element ② alloy ③ composite metal ④ special functional conductive material
Main properties: electrical properties of conductive materials are mainly characterized by resistivity. The factors affecting resistivity include temperature, impurity content, cold deformation, heat treatment, etc. The influence of temperature is often expressed by the temperature coefficient of the resistivity of conductive materials. In addition to near melting point and ultra-low temperature, the resistivity changes linearly with temperature in the general temperature range [1]
composite Polymer conductive materials It is made of general polymer materials and various conductive substances through filling composite, surface composite or laminated composite. The main varieties are conductive plastics Conductive rubber, conductive fiber fabric Conductive coating Conductive adhesive, transparent conductive film, etc. Its properties are closely related to the type, amount, particle size and state of conductive fillers and their dispersion in polymer materials. Common conductive fillers are Nickel coated graphite powder , nickel coated carbon fiber carbon black, metal powder, metal foil Metal fibre , carbon fiber, etc. Structural polymer conductive materials refer to the polymer materials with conductive function after the polymer structure itself or doping. According to the conductivity, it can be divided into Polymer semiconductor , polymer metals and polymer superconductors. According to the conductive mechanism, it can be divided into electronic conductive polymer materials and Ionic conductive polymer Material Science. The structural feature of electron conducting polymer materials is that they have linear or surface large conjugated systems, and conduct electricity through the activation of conjugated π electrons under the action of heat or light. The conductivity is generally in the range of semiconductors. The conductivity of these materials can be greatly improved by doping technology. If a small amount of iodine is doped in polyacetylene, the conductivity can be increased by 12 orders of magnitude, becoming a "polymer metal". The doped polysulfide can be transformed into polymer superconductor at ultra-low temperature. Structural polymer conductive materials are used for trial production of light plastic batteries, solar cells, sensor components Microwave absorbing material And trial production of semiconductor components. However, such materials have not yet entered the practical stage due to their poor stability (especially the poor oxidation stability of doped materials in air), processing formability and mechanical properties. The non electrical properties of metal conductive materials will become more important in some specific occasions, such as thermal conductivity Contact potential difference 、 Thermoelectric electromotive force Mechanical strength, high temperature resistance, corrosion resistance, wear resistance, etc. Thermal conductivity is of great significance when considering temperature rise in the design of motors, cables, electrical instruments and other electrical products. Metal with high conductivity is also a metal with high thermal conductivity. The thermal conductivity of pure metal is higher than that of alloy. Contact potential difference and thermoelectric electromotive force are of great significance in thermoelectric temperature control, temperature measuring elements and instruments. Conductors and alloys with high tensile strength are used in overhead lines. In aerospace, aviation and other national defense technologies, the high temperature conductors for manufacturing high temperature conductors and high temperature motors have developed rapidly. [2] Conductive rubber has good electromagnetic sealing and water vapor sealing capabilities, and can provide good conductivity under certain pressure (suppression frequency reaches 40GHz). The product meets the US military standard MIL-G-83528. Products are widely used in aerospace, aviation, ships, weapons and other military electronic equipment.
Chassis, cabinet, shelter and other electronics and microwave Waveguide System, connector gasket, etc. 
