Double ( multiple ) layer metal composite materials is the use of composite technology to make two or more than two kinds of physical, chemical, and mechanical properties of different metals in the interface to achieve firm metallurgical bonding and the preparation of a new material, each layer of material, can keep the original performance characteristics, and the physical, chemical, mechanical more superior performance than the single material, improve the comprehensive performance of the material.

Composite metal material is rare, precious metal and alloy compound layer, with copper, aluminum, iron alloy as base, formed by the compound of new materials. Its main characteristic is the precious metals, rare metals ( gold, silver, platinum, palladium, iridium, rhodium, ruthenium, osmium, and nickel) unique electrical, chemical properties and copper, aluminum and other excellent mechanical properties of organic combination to produce excellent comprehensive properties of composite plating ( superior, do not layered, firm combination ). General Electric, rely on electrical contact material to pass, closed, transmission, display, energy conversion, automatic control and so on, it information technology, network system and all kinds of electronic automation equipment to achieve high precision, high reliability, long life, small and upgrading play a decisive role. Composite metal material is the key to the development of electronic information technology material, belonging to the new material planning focus areas, has a strong vitality, wide application prospect and huge development space. The market of electronic information industry in the world has become second only to the auto industry's second largest industry.

Enter since twenty-first Century, to save resources, reduce costs, improve environmental consciousness is becoming stronger and stronger. Nickel / aluminum / copper, steel, stainless steel / steel, aluminum, copper / nickel / copper / nickel composite plate because of its good corrosion resistance, electrical conductivity and good surface decoration, can be used as a senior decorative plate and structural materials, which significantly improves the performance, and reduce the cost, at the same time to save resources, protect environment is of great significance.

Composite plate, strip rolling method with composite method, cold rolling composite method, powder rolling composite method, asynchronous rolling composite method, covered rolling method, explosive composite method. These methods because its yield is low, the production process is long, complex quality is not stable, the finished roll diameter is small wait for a problem, make your -- cheap metal composite roll with high production costs, greatly restricted the development of domestic IT industry. Trace and cold composite and vacuum pressing infiltration process, very good solution to the composite strength and nickel layer hardness control conflict. Because of the controllable cooling composite, vacuum hot pressing permeable critical rolling deformation rate is low, in ensuring the original characteristics of metal and the metal binding force between will also achieve the best.

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