A kind of preparation method of molybdenum or molybdenum alloy surface rare earth metal-boron binary co-infiltration layer

Abstract

The invention provides a method for preparing a rare earth metal-boron binary co-infiltration layer on the surface of molybdenum or molybdenum alloys, wherein the molten salt system is first pretreated before electrochemical binary co-infiltration, and the pretreatment process is as follows: : Put the molten salt system into the sealed seepage tank, pressurize and keep warm in the seep tank, the pressurized pressure is 0.3-0.7MPa, the keep-warm temperature is 100°C-300°C, and the pressurization time is 0.5-1h. The molybdenum or molybdenum alloy with binary co-infiltration layer prepared by the method of the present invention has good high temperature oxidation resistance and can resist high temperature oxidation corrosion; the La-B binary co-infiltration layer prepared by the method is compatible with molybdenum or molybdenum alloy substrate Good capacity, not easy to crack, not easy to fall off. The service temperature of molybdenum or molybdenum alloy after surface binary co-infiltration treatment can reach 1500 ℃.

Description

technical field [0001] The invention belongs to the field of molybdenum or molybdenum alloys, and relates to a binary co-infiltration layer, in particular to a method for preparing a rare earth metal-boron binary co-infiltration layer on the surface of molybdenum or molybdenum alloys. Background technique [0002] Molybdenum is a silver-gray refractory metal with a melting point as high as 2625°C. It has excellent high-temperature strength, good electrical and thermal conductivity, and low thermal expansion coefficient (6.7×10 -6 / °C, 1200K), excellent high temperature creep resistance, and good corrosion resistance to liquid metal potassium, sodium, magnesium, cesium, bismuth, etc., as one of the new generation of strategically important rare metals, it has been widely used In metallurgy, petroleum, machinery, chemical industry, aerospace, nuclear industry and many other fields. Using molybdenum as the base material, adding an appropriate amount of Ti, Zr, W, Re, Si, Hf, C...

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Problems solved by technology

[0011] Based on the problems in the prior art, the present invention provides a method for preparing a rare earth metal-boron binary co-infiltration layer on the surface of molybdenum or molybdenum alloys, which solves the problem of low binary co-infiltration rate and thin thickness of the infiltration layer in the prior art. Or the technical problem of poor oxidation resistance of molybdenum alloy

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