In the past ten years, the rise in copper prices has accelerated the development of copper-aluminum composite materials, and the application areas of AI-Cu bi-metal plate have gradually expanded. The main common areas are heat dissipation, communication, electricity, etc.
1. Application on heat dissipation substrate of high-power LED package
Judging from the current LED technology, it is still unable to perfectly solve the core problem of photoelectric conversion efficiency. Therefore, the heat dissipation problem is a bottleneck problem in the development of the LED industry. In addition to adding a heat sink, packaging is the core link to solve the heat dissipation problem.
At present, high-power LED packaging technology mostly adopts MCOB packaging. Compared with traditional COB packaging technology, MCOB's aluminum substrate welding chip has no insulating layer, and the heat is directly introduced to the metal substrate, and the heat is quickly exported, reducing the chip junction temperature and extending the planar light source. Service life.
2. Application in the field of radiator fins
Currently, copper, aluminum, and silver are widely used in the market for heat dissipation fin materials. Its thermal conductivity and heat dissipation performance are shown in the table. The heat dissipation capacity of the material depends on the heat capacity of the material. Copper has good thermal conductivity and poor heat dissipation performance, and aluminum has poor thermal conductivity but excellent heat dissipation performance. Combining the advantages of the two materials, the thermal conductivity and heat dissipation performance are good. The heat dissipation performance of AI-Cu bi-metal plate decreases with the increase of copper content, and its thermal conductivity increases with the increase of copper content. Therefore, a suitable ratio of copper-aluminum composite materials can achieve a balance of thermal conductivity and heat dissipation performance, and give full play to the thermal conductivity of copper materials and the heat dissipation performance of aluminum materials. The comprehensive heat dissipation performance of the copper-aluminum composite fin is better than pure copper and pure aluminum materials, and it is a good heat dissipation material.
Copper-aluminum composite heat dissipation fins are superior to pure copper materials in terms of cost and comprehensive heat dissipation performance, and have broad promotion prospects in the electronics, communications, computers, PLC, gas water heater, air conditioning, and refrigeration industries.
3. Application in the power industry
The power industry's requirements for AI-Cu bi-metal plate are mainly in four aspects: electrical performance, mechanical performance, processing performance, safety and reliability. The surface copper of AI-Cu bi-metal plate is a hot-rolled billet, with a dense internal structure, and a product with better mechanical properties and electrical conductivity than the as-cast structure. The AI-Cu bi-metal plate has high bonding strength, and the state of the composite row can be adjusted by heat treatment. The mechanical properties and machining performance are no different from those of pure copper. Copper and aluminum have their own characteristics. The welding of copper-aluminum composite materials cannot use traditional fusion welding. It is suitable for the brazing process commonly used in composite materials. The development of medium-temperature brazing technology is closely related to the popularization and application of copper-aluminum composite strips.
As a conductor material, its electrical performance can be adjusted by the cross-sectional area and the volume ratio of copper to aluminum, which can meet electrical performance requirements. In terms of safety and reliability, the copper-aluminum strip has passed the high and low temperature performance test, and the composite performance, electrical performance, and mechanical performance have not changed.
4. Copper-aluminum composite transition material
AI-Cu bi-metal plate is widely used in the electrical industry with a wide variety of products, including transformer copper-aluminum transition device joints, copper-aluminum equipment clamps, reactors, and transformer connection bars. At present, copper-aluminum composite joints mainly adopt friction welding, diffusion welding, flash welding, explosive welding and other processes. With the development of photovoltaic power generation and wind power generation, in order to ensure the stability of power supply in power plants, when using transformers, reactors and other equipment, The reliability requirements of copper-aluminum transition joints are getting higher and higher. The brittleness problem of the traditional process itself cannot meet the market demand. The copper-aluminum composite plate-strip transition joint does not have the problem of joint brittleness, which fundamentally solves the hidden quality problems of transition joints. Expanded its application space.
