Nickel chromium alloy for sealing face of nuclear power valve
A technology of valve sealing and nickel-chromium alloy, which is applied in the coating process and coating of metal materials, can solve the problems of increasing the difficulty and cost of nuclear fuel shielding, prolonging the half-life of nuclear radiation, and the high price of cobalt-based alloys. Less heat, short heat action time, high hardness and toughness
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Embodiment 1
[0036] (1) The percentage by weight of the nickel-chromium alloy powder mixture composition for preparing the sealing surface coating of nuclear power valves is: chromium: 28.0%, silicon: 2.5%, boron: 1.3%, molybdenum: 5.5%, tungsten: 4.0%, carbon: 1.1 %, the rest is nickel; the above powders are mixed by mechanical mixing method, the powder particle size is 200-300 mesh, and baked and dried;
[0037] (2) On the sealing surface of nuclear power valves with stainless steel substrates, the power used is 10 4 W / cm 2 The laser irradiates the surface of the substrate to form a local molten pool, and the mixed powder is sent into the molten pool by the synchronous powder feeding method, and the inert gas nitrogen is used as the delivery gas. When the laser acts on the substrate and the mixed powder, the solvent is protected by the inert gas nitrogen pool surface to avoid oxidation; the laser is CO 2 Laser, the scanning speed of the laser beam is 3mm / s, the spot size is 3mm, and th...
Embodiment 2
[0040] (1) The percentage by weight of the nickel-chromium alloy powder mixture composition for preparing the sealing surface coating of nuclear power valves is: chromium: 28.0%, silicon: 2.5%, boron: 1.3%, molybdenum: 5.5%, tungsten: 4.0%, carbon: 1.1 %, the rest is nickel; the above-mentioned powders are mixed by mechanical mixing method, and the particle size of the powder is 200-300 mesh;
[0041] (2) Use ethanol to dissolve 2123 phenolic resin material as an adhesive, mix it with the above powder mixture, and coat a ring-shaped pre-coating with an average diameter of 50mm, a width of 5mm, and a thickness of 2.5mm on the sealing surface of the nuclear power valve of the stainless steel substrate , and baked to dry;
[0042] (3) Use a power of 10 4 W / cm 2 The laser irradiates the coated annular pre-laying coating, and at the same time blows inert gas to the molten pool to avoid oxidation of the molten pool surface; the laser uses CO 2 Laser, the laser beam scanning speed i...
Embodiment 3
[0045] The specific steps are the same as in Example 1, the difference is that the weight percentages of the powder mixture components described in step (1) are adjusted to chromium: 26.0%, silicon: 2.0%, boron: 1.1%, aluminum: 4.5%, tungsten: 3.0% , Carbon: 0.9%, the rest is nickel. A coating with a hardness of HRC42 is obtained.
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