The electronic industry is an emerging industry. In the process of its rapid development, new products and new application fields of copper are constantly developed. The application of copper alloy has developed from electric vacuum device and printed circuit to lead frame.
Electric Vacuum Device
Vacuum devices are mainly high-frequency and ultra-high-frequency transmitting tubes, waveguides, magnetrons and so on. They need high-purity oxygen-free copper and dispersion strengthened oxygen-free copper.
Printed Circuit
Copper printed circuit is to use copper foil as surface and stick it on plastic plate as support. In this way, for those occasions that need fine circuit layout, such as radio, television, computer, etc., the use of printed circuit can save a lot of wiring and fixed circuit labor; therefore, it is widely used, requiring a large amount of copper foil consumption. In addition, copper base brazing materials with low price, low melting point and good fluidity are also needed in the connection of circuits.
Lead Frame
In order to protect the normal operation of integrated circuit or hybrid circuit, it is necessary to package it, and in the process of packaging, a large number of connectors in the circuit are led out from the sealing body. These leads are required to have a certain strength, forming the support framework of the integrated packaging circuit, called lead frame. In practical production, for high-speed mass production, the lead frame is usually formed by continuous stamping on a metal strip in a specific arrangement. Frame materials account for 1 / 3 ~ 1 / 4 of the total cost of integrated circuits, and the amount of materials used is very large.
Copper alloy has low price, high strength, conductivity and thermal conductivity, excellent processability, pin welding property and corrosion resistance. Its performance can be controlled in a large range through alloying, which can better meet the performance requirements of lead frame. It has become an important material for lead frame. At present, copper is the most widely used material in microelectronic devices.
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