Fused salt system for molybdenum or molybdenum alloy binary co-penetration, composite catalyst and application

Abstract

The invention provides a fused salt system for molybdenum or molybdenum alloy binary co-penetration, a composite catalyst and application. The fused salt system comprises 10% to 20% of borax, 0.9% to 1.2% of penetration-catalyzing activating agent rare earth metal, 2% to 6% of the composite catalyst and the balance fused salt. The mass ratio of thiourea and nickel chloride in the composite catalyst is 1:(0.8-1.25). The fused salt system for molybdenum or molybdenum alloy binary co-penetration is used for application of electrochemical binary co-penetration for manufacturing a rare earth metal-boron binary co-penetrated layer on the surface of molybdenum or molybdenum alloy. The molybdenum or molybdenum alloy manufactured through the fused salt system or provided with the binary co-penetrated layer is good in high-temperature oxidation resistance and can resist high-temperature oxidation corrosion. The composite catalyst is added to achieve the overall electrolysis effect, compared with a method that alloy is obtained through single rare earth penetration catalysis, the compatibility of the La-B binary co-penetrated layer manufactured through the method and a molybdenum or molybdenum alloy base body is good, and the La-B binary co-penetrated layer is not prone to cracking or falling. The use temperature of the molybdenum or molybdenum alloy with the surface subjected to binary co-penetration treatment can reach 1500 DEG C.

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 molybdenum or molybdenum alloy binary co-infiltration molten salt system, a composite promoter and its application. 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 and other...

AI Technical Summary

Problems solved by technology

[0011] Based on the problems existing in the prior art, the present invention provides a molybdenum or molybdenum alloy binary co-infiltration molten salt system, a composite promoter and its application to solve the problem of low binary co-infiltration rate and thin infiltration layer thickness in the prior art Technical problems leading to poor oxidation resistance of molybdenum or molybdenum alloys

Images