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        Technical Principle of High-purity Nickel Strip Foil

          Yuanhang group take Canada import nickel board of the world highest quality as the raw material.. According to nickel's phase variation law, stepwise reduction method is used to reduce the contents of noisome impurities of sulfur and phosphorus in the nickel, and slagging practice and vacuum electronic for refining purification in the solid phase section to achieve vacuum degree of -3 torr.

        Vacuum melting has the following strong points:
        •    The gas in the liquid metal can be discharged quickly to form low air content in the fusant.
        •    The oxidizing loss of alloying element will be cut down in large amount and the oxidation slag inclusion in the fusant will be cut off sharply.
        •    The fusant doesn't need covering flux and flux addition, not vulnerable to contamination.
        •    Improve the performance of metal alloy with an increase of 80% for impact ductility, 30% respectively for long-time strength and extensibility, and 50% for reduction of cross section area.

          Analyze 16 impurity elements, the purity can reach 99.986%; analyze 11 impurity elements, the purity can reach 99.99%, and the total amount of other elements is equal to or less than 0.01%, nickel purity is increased distinctly in comparison with other advanced nickel processing countries. Stepwise reduction and slagging technologies are firstly introduced at home with the content of sulfur and phosphorus under 10ppm, and resistivity ρ≤0.068 Ω•mm2/M, which guarantees the achievement of stable and uniform resistivity and well meets the production requirements. The processing adopts hot cogging and cold rolling, which not only reduces contamination but also saves energy source. Medium roll and finishing mill both adopt imported multi-roll machine for rolling press with the minimum thickness of 0.02 mm and tolerance control ±0.001mm, uniform in material hardness, the specification state includes M, 1/4Y, 1/2Y, 3/4Y, Y, narrow strip processing adopts Germany imported equipment to cut strips. The section is regular rectangle. This process is precise and of high technical requirements and its product quality is excellent with minimum width of 1mm.
         
        High-purity nickel strip foil features

        Physical feature:

        Density in 700F 8.90 g/cm3; 0.322 ib./cu.in
        Linear expansion coefficient (Inch/Inch/0C) 20-100℃ 0.000014 20-200℃ 0.000014
        Linear expansion coefficient (Inch/Inch/0C) 0.000015 20-700℃ 0.000016
        Youngs modulus of elasticity,E,PSI×10-6 30.1
        Conductivity 22.6% IACS
        Specific resistance in200C microhm.cm:7.63 ohms/cir.mil./ft.:45.9
        Thermometric conductivity cal./cm.2sec.0C/cm.at700C:cal./cm.2sec.0C/cm.at700C:0.206 BTU/ft.2/hr./0F/ft.at 1580C:49.9
        Temperature coefficient of resistance 200-1000C/0C 0.0058 200-5000C/0C 0.0074 200-8000C/0C 0.0060
        Atomic number 28     Atomic weight 58.1
        Atomic radius(A) 1.25   Crystal structuref.c.c
        Crystal constant(A) 3.52   Melting point 1.4530C; 2.6470F   Boiling point 2.7300C;4.9500F
        Latent heat of fusion 73.8cal./g  Specific heat at 200C-BTU/ib./0F 0.105
        Interelectrode potential 0.25volts  Velocity of sound 16.300ft./sec.;4.973m/sec.
        Poisson ratio 0.31    Thermal neutron cross section ( target ) absorption:4.6   Scatter:17.5

        Magnetism:

        Curie temperature 3530C; 6650F Initial permeability 130
        Maximum permeability 124     Saturation induction(B) 6050
        Remnant induction(B) 3250    Diamagnetism(H) 3.0
         
        Technological Flow Sheet
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