Copper alloys have harsh service conditions in aerospace, high-speed railways and other fields, and have extremely high requirements for various performance indicators and safety and reliability. For a long time, China's high-performance copper alloys have been highly dependent on imports, and purchase prices have remained high. It has become increasingly urgent to develop high-strength and high-conductivity copper alloys with independent intellectual property rights.
China's leading copper alloy technology company, BJYY Alloy Technology Group, after more than 20 years of technological innovation and accumulation, has developed high-strength and high-conductivity copper alloy nano-complex control strengthening technology, and has achieved a number of innovative results:
The first is to develop Cu-Cr alloy composition precision and uniform structure control melting and casting technology, strip rolling-aging composite processing technology and advanced forming technology for complex parts, etc., to effectively ensure the fine dispersion and precipitation of the elemental Cr phase during the aging process, and improve Material resistance to stress relaxation.
The second is to propose the dual synergistic strengthening of Cu-Ni-Si alloy nickel-silicon ratio design principles, develop δ-Ni2Si nano-particles high-density, high-uniform distribution combined aging control technology, invent Cu-Ni-Si-Al-Mg-Cr alloy and Realize the best dual synergistic strengthening of Cu-Ni-Si alloys.
The third is to grasp the law of the influence of the size of the pre-ageing precipitates on the softening resistance of the alloy, and develop the hot-rolling quenching + pre-aging + combined deformation heat treatment process, and the alloy softening temperature can reach 500 ℃. The fourth is to reveal the mechanism of Al2O3 particle nucleation and growth, establish the correlation model of Al2O3 particle size and spacing control, invent an integrated internal oxidation-reduction-sintering preparation technology, and realize the efficient and stable industrial production of Cu-Al2O3 alloy profiles.
The project won 1 National Science and Technology Progress Award, 25 authorized invention patents, 2 utility model patents, formulated 3 national standards, 1 industry standard, published 3 monographs, and published 67 papers.