Preparation method of nickel-platinum alloy with high purity and low gas content
A nickel-platinum alloy, gas content technology, applied in metal material coating process, vacuum evaporation coating, coating and other directions, to achieve the effect of ensuring purity, improving material purity, and reducing precious metal loss
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[0030] according to figure 1 The process flow shown carries out the preparation of nickel-platinum alloy.
[0031] Firstly, the required raw materials are platinum powder and high-purity electrolytic nickel, wherein the purity of platinum powder is ≥99.99%, and the purity of nickel is ≥99.9995%. Do pretreatment on the raw material platinum powder first, put the platinum powder into a special mold, increase the pressure by 50-80MPa, and then raise the temperature at a heating rate of 50-100°C / min. After the temperature reaches 600-800°C, start heat preservation and pressure holding , and the holding time is 45-60 minutes to obtain high-purity platinum blocks.
[0032] Secondly, high-purity electrolytic nickel is put into the crucible for smelting. In this process, in order to ensure the thermal stability of the crucible and avoid impurities caused by cracking or peeling off at high temperature, and in order not to interact with the smelted metal, it is necessary to control the...
Embodiment 1
[0037] 1) Weighing the ingredients, taking 0.6 kg of platinum powder with a purity of ≥99.99% and 11.4 kg of high-purity electrolytic nickel with a purity of ≥99.9995%. Put the platinum powder into a clean special mold, then apply a pressure of 50MPa, and then start to heat up at a rate of 50°C / min until the temperature reaches 700°C, keep the pressure and temperature for 60min, then remove the pressure, and take out the high-purity Platinum block.
[0038] 2) High-purity nickel smelting, first put high-purity nickel into a high-purity zirconia crucible, and vacuumize to 10 -3 Pa, slowly heat the high-purity nickel in the crucible at a rate of 10°C / min to 1460°C, keep it warm for 20 minutes, complete the smelting of high-purity nickel, and then cool down to below 600°C for solidification and degassing for 30 minutes; obtain high-purity nickel solidified body;
[0039] 3) Nickel-platinum alloy smelting: Add the high-purity platinum block obtained in step 1) to the high-purity ...
Embodiment 2
[0043] 1) The ingredients are weighed. First, 1.8 kg of platinum powder with a purity of ≥99.99% is weighed, and then 10.2 kg of high-purity electrolytic nickel with a purity of ≥99.9995% is weighed. Put the platinum powder into a clean special mold, then apply a pressure of 70MPa, and then start to heat up at a rate of 80°C / min until the temperature reaches 800°C, keep the pressure and temperature for 55min, then remove the pressure, and take out the high-purity Platinum block.
[0044] 2) High-purity nickel smelting, first put high-purity nickel into a high-purity zirconia crucible, and vacuumize to 10 -3 Pa, slowly heat the high-purity nickel in the crucible at a rate of 15°C / min to 1500°C and keep it warm for 15 minutes to complete the smelting of high-purity nickel, then cool down to below 600°C for solidification and degassing for 60 minutes to obtain a high-purity nickel solidified body;
[0045] 3) Nickel-platinum alloy smelting: Add the high-purity platinum block obt...
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