PLATING (FORMING) SOLUTION FOR MANUFACTURING NANO-CRYSTALLINE Fe-Ni ALLOY HAVING LOW THERMAL EXPANSION PROPERTY AND MANUFACTURING METHOD THEREOF

摘要

PURPOSE: A plating (forming) solution and process conditions are provided to manufacture a low thermal expansion property Fe-Ni alloy sheet having low thermal expansion coefficient of 9 μm/m·K or less by electrodeposition or electroforming. CONSTITUTION: The electrolyte for manufacturing Fe-Ni alloy comprises 1 liter of water; 25 to 73 g of FeSO4·7H2O (ferrous sulfate), FeCl2·4H2O (ferrous chloride) or a mixture thereof; 97 g of NiSO4·6H2O (nickel sulfate), NiCl2·6H2O (nickel chloride), Ni(NH2SO3)2 (nickel sulfamate) or a mixture thereof; 20 to 30 g of H3BO3 (boric acid); 1 to 3 g of C7H4NO3SNa (sodium saccharin); 0.1 to 0.3 g of C12H25O4SNa (sodium lauryl sulfate), and 20 to 40 g of NaCl (sodium chloride), wherein the electrolyte has pH of 2 to 4, current density of 50 to 100 mS/cm¬2 and temperature of 50 to 60 deg.C.