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A kind of molybdenum or molybdenum alloy binary co-infiltration molten salt system, composite promoter and application

A molten salt system and molybdenum alloy technology, applied in the field of molybdenum or molybdenum alloy, can solve the problems of thin infiltration layer thickness, low binary infiltration rate, poor oxidation resistance of molybdenum or molybdenum alloy, etc. Good oxidation resistance at high temperature and the effect of resisting high temperature oxidation corrosion

Active Publication Date: 2018-04-27
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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  • A kind of molybdenum or molybdenum alloy binary co-infiltration molten salt system, composite promoter and application
  • A kind of molybdenum or molybdenum alloy binary co-infiltration molten salt system, composite promoter and application
  • A kind of molybdenum or molybdenum alloy binary co-infiltration molten salt system, composite promoter and application

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Embodiment 1

[0040] This embodiment provides a molybdenum or molybdenum alloy binary co-infiltration molten salt system and composite catalyst, as shown in Table 1 of the formula milk, the molybdenum or molybdenum alloy binary co-infiltration molten salt system of this embodiment is used The application of electrochemical binary co-infiltration to prepare the rare earth metal-boron binary co-infiltration layer on the surface of molybdenum or molybdenum alloy, the specific process includes the following steps:

[0041] Step 1, preparing molybdenum matrix or master alloy matrix:

[0042] Put molybdenum or molybdenum alloy in 20wt% NaOH solution, boil alkali to remove grease, wash with water after ultrasonic cleaning; then place in 30wt% HCl solution and heat to 90°C, keep for 1h to pickle and decontaminate; then place The surface is etched in a 10wt% hydrofluoric acid solution at a temperature of 80° C. until a uniform pockmark is formed on the surface. After taking it out, it is washed with...

Embodiment 2

[0051] This embodiment provides a molybdenum or molybdenum alloy binary co-infiltration molten salt system and composite catalyst, as shown in Table 1 of the formula milk, the molybdenum or molybdenum alloy binary co-infiltration molten salt system of this embodiment is used For the application of electrochemical binary co-infiltration to prepare the rare earth metal-boron binary co-infiltration layer on the surface of molybdenum or molybdenum alloy, the specific process is the same as in Example 1, and the specific conditions are shown in Table 1. The difference is that the molybdenum substrate is selected in this embodiment. The material is pure molybdenum rod matrix.

Embodiment 3

[0055] This embodiment provides a molybdenum or molybdenum alloy binary co-infiltration molten salt system and composite catalyst, as shown in Table 1 of the formula milk, the molybdenum or molybdenum alloy binary co-infiltration molten salt system of this embodiment is used For the application of electrochemical binary co-infiltration to prepare the rare earth metal-boron binary co-infiltration layer on the surface of molybdenum or molybdenum alloy, the specific process is the same as in Example 1, and the specific conditions are shown in Table 1. The difference is that the molybdenum alloy substrate is selected in this embodiment. The material of the alloy matrix is ​​a plate of Mo-Ti alloy.

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Abstract

The present invention provides a molybdenum or molybdenum alloy binary co-infiltration molten salt system, composite catalyst and its application. The molten salt system includes 10% to 20% of borax, and 0.9% of infiltration activator rare earth metal ~1.2%, the compound promoter is 2%~6%, and the balance is molten salt. The mass ratio of thiourea and nickel chloride in the composite promoter is 1: (0.8-1.25). The molten salt system of molybdenum or molybdenum alloy binary co-infiltration is used for the application of electrochemical binary co-infiltration to prepare the rare earth metal-boron binary co-infiltration layer on the surface of molybdenum or molybdenum alloy. The molybdenum or molybdenum alloy with a binary co-infiltration layer prepared by the molten salt system of the present invention has good high-temperature oxidation resistance and can resist high-temperature oxidation corrosion; it is obtained by adding a composite promoter to the electrolysis of the whole, and infiltrating with a single rare earth Compared with alloys, the La-B binary co-infiltration layer prepared by this method has good compatibility with molybdenum or molybdenum alloy substrates, and is not easy to crack and 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 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C12/02C25C3/34
CPCC23C12/02C25C3/34
Inventor 胡平王快社宋瑞杨帆谭江飞于志涛胡卜亮王碧侠
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY