CMC alloy process(copper molybdenum copper alloy) - rolling cladding as follow：
Rolling cladding is a method using a large amount of reduction, so that 2 or more layers of metal or alloy is deformed, relying on metal bond between atoms are attracted to each group element layers together closely preparaed of a composite material, the method is currently the most mature, the most widely used Cu/Mo/Cu composites technologies.
U.S. Amax companies and Climax SpecialtyMetals companies use hot composite technology, successfully produced a variety of sizes, local or full-coated CMC alloy (Cu/Mo/Cu) multilayer composite materials, and applied for a patent. And molybdenum-copper alloy, copper alloy powder metallurgy tungsten particles produced enhanced electronic packaging materials, the production of flat rolled composite multi-layer composite electronic packaging materials high thermal efficiency, low cost, and can produce large size packaging materials to achieve large-scale production.
U.S. Ploymetallurgical type material in the production of coated behalf of the industry's highest level, the company produces CMC alloy composites in the international arena in the first-class level. CMC alloy products part of their performance in Chart 1.
Chart. CMC Alloy Product Performance
| CMC alloy Layer Thickness Ratio |
Density /(g·cm-3) |
Plane Direction Thermal Expansion Coefficient/ (10-6/K) | Thickness Direction Thermal Expansion Coefficient/(10-6/K) | Plane Sirection Thermal Conductivity/(W /m·K) | Thickness Direction Thermal Conductivity/(W /m·K) |
| 1∶1∶1 | 9. 340 | 10. 0 | 13. 0 | 306 | 245 |
| 1∶2∶1 | 9. 550 | 8. 3 | 11. 0 | 267 | 208 |
| 1∶6∶1 | 9. 986 | 6. 5 | 8. 2 | 207 | 170 |
Japan A.L.M.T company will molybdenum copper alloy rolled into a strip, with its CMC alloy acts as an intermediate layer, the use of hot-rolled prepared a Cu/Mo/Cu planar composite electronic packaging materials. As molybdenum-copper alloy of copper was filled in the network between the molybdenum skeleton-like distribution, making the product in a planar direction and a thickness direction of the electrical and thermal conductivity than the same thickness ratio of Cu/Mo/Cu better.
Mo-Cu layer and the middle due to copper added, showed a more excellent processing performance. Plansee, Austria produced Cu/Mo-30Cu/Cu (1:4:1) 3 layered composite material has a density of 9. 5 g/cm3, the thermal conductivity of the planar direction ≥ 260W/m · K, the thermal expansion coefficient of 4.0 × 10-6 ~ 10.0 × 10-6/K, these properties are listed in table 1, even better than the layer thickness ratio of 1:2:1 Cu/Mo/Cu composite material is more excellent.
Rolling cladding technology and equipment is more mature, high yield, greatly reduce production costs, but also easy to implement large-scale industrial production, is a great potential for development of composite material technology. But rolling composite one-time investment, it is not conducive to small batch production.
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