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Method for preparing anti-oxidation coatings on surface of molybdenum and molybdenum alloy

An anti-oxidation coating, molybdenum alloy technology, applied in metal material coating process, coating, liquid chemical plating and other directions, can solve the problem of poor compatibility, low bonding strength between coating and substrate, acid and alkali corrosion resistance Good compatibility, similar thermal expansion coefficients, and resistance to high temperature oxidation and corrosion

Active Publication Date: 2014-07-23
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Common high-temperature anti-oxidation coatings include aluminide coatings, silicide coatings, heat-resistant alloy coatings, etc., but most of them have shortcomings such as low bonding strength between the coating and the substrate, poor compatibility, and poor acid and alkali corrosion resistance.

Method used

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  • Method for preparing anti-oxidation coatings on surface of molybdenum and molybdenum alloy
  • Method for preparing anti-oxidation coatings on surface of molybdenum and molybdenum alloy
  • Method for preparing anti-oxidation coatings on surface of molybdenum and molybdenum alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Step 1: Select a pure molybdenum plate with a purity of 99.95% or more, with an area of ​​100cm 2 , placed in 30wt% NaOH solution and boiled, ultrasonically cleaned for 1h, taken out and washed with water; placed in 10wt% HCl solution and heated to 90°C for 1.5h; then placed in hydrofluoric acid at 80°C The surface is etched in the solution (5wt%) until uniform pockmarks are formed on the surface. After taking it out, it is washed with deionized water and dried to obtain a pure molybdenum plate substrate.

[0024] Step 2: Mix 5g of hafnium oxychloride and 4g of yttrium chloride and dissolve in 50ml of n-propanol solution to obtain the desired coating solution.

[0025] Step 3: Then apply the coating solution in step 2 evenly on the pockmarked surface of the surface treated substrate, and brush 20 times. After each brushing, put it in a drying oven for 10 minutes at a drying temperature of 120°C, and then place it in the Baking in a muffle furnace for 20 minutes at a fi...

Embodiment 2

[0029] Step 1: Select a pure molybdenum rod with a purity of more than 99.95%, 100mm in length and 15mm in diameter, boil it in 20wt% NaOH solution, clean it with ultrasonic waves for 1 hour, take it out and wash it with water; place it in 20wt% HCl solution heated to 80°C and kept for 1.5h; then placed in a hydrofluoric acid solution (10wt%) at a temperature of 80°C for surface etching until a uniform pockmark was formed on the surface, after taking it out, wash it with deionized water, and dry it. A pure molybdenum rod matrix is ​​obtained.

[0030] Step 2: Mix 8 g of hafnium oxychloride and 4 g of yttrium chloride and dissolve in 50 ml of n-propanol solution to obtain the desired coating solution.

[0031] Step 3: Then apply the coating solution in step 2 evenly on the pockmarked surface of the surface treated substrate, and brush 20 times. After each brushing, put it in the infrared lamp and dry it for 10 minutes at a drying temperature of 130°C, and then place it in the ...

Embodiment 3

[0034] Step 1: Select the rare earth lanthanum-doped TZM alloy plate prepared by powder metallurgy process, with an area of ​​80cm 2 , placed in 10wt% NaOH solution and boiled, ultrasonically cleaned for 1.5h, taken out and washed with water; placed in 30wt% HCl solution and heated to 80°C for 1h; then placed in hydrofluoric acid at a temperature of 70°C The surface is etched in the solution (15wt%) until uniform pockmarks are formed on the surface. After taking it out, it is washed with deionized water and dried to obtain a TZM alloy plate substrate.

[0035] Step 2: Mix 15g of hafnium oxychloride and 4g of yttrium chloride and dissolve in 80ml of n-propanol solution to obtain the required coating solution.

[0036] Step 3: Then apply the coating solution in step 2 evenly on the pockmarked surface of the surface treated substrate, and brush 30 times. After each brushing, place it in a drying oven for 15 minutes at a drying temperature of 140°C, and then place it in the Bakin...

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Abstract

The invention discloses a method for preparing anti-oxidation coatings on the surfaces of molybdenum and a molybdenum alloy. The method can be used for preparing Hf-Y mixed oxide coatings on the surfaces of the molybdenum and the molybdenum alloy by adopting a stepwise brushing method. The method comprises the following steps: firstly carrying out alkali cleaning degreasing and pickling decontamination on the surfaces of the molybdenum and the molybdenum alloy, washing, and then carrying out hydrofluoric acid surface etching treatment to prepare a substrate; then preparing a normal propyl alcohol solution of hafnium oxychloride and yttrium chloride according to a certain proportion to prepare a needed coating liquid; uniformly brushing the coating liquid to the substrate surfaces of the molybdenum and the molybdenum alloy; and after the coating liquid is brushed every time, firstly drying and then roasting, repeating for 15-30 times, and roasting for 1-2 hours for the last time to prepare the Hf-Y mixed oxide coatings on the surfaces of the molybdenum and the molybdenum alloy. The coatings prepared through the method have the advantages of excellent high temperature oxidation resistance, compact coating material, good compatibility with the substrate and difficulty in dropping and greatly enlarges the usage ranges of the molybdenum and the molybdenum alloy.

Description

technical field [0001] The invention relates to a method for preparing an anti-oxidation coating on the surface of molybdenum and molybdenum alloys, in particular to a method for preparing an Hf-Y mixed oxide anti-oxidation coating on the surface of molybdenum and molybdenum alloys. technical background [0002] Molybdenum and molybdenum alloys are an important high-temperature alloy material. Because of their excellent electrical and thermal conductivity, high melting point, high strength, small linear expansion coefficient, strong corrosion resistance and good high-temperature mechanical properties, they are widely used in aviation. Aerospace, power generation, nuclear reactors, military industry, chemical industry, electronics industry and glass manufacturing and other fields. However, since molybdenum will oxidize at about 300°C to form MoO 2 , when the temperature rises to about 600 °C, secondary oxidation will occur to form MoO 3 , at around 725 °C MoO 3 Volatilize ...

Claims

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Application Information

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IPC IPC(8): C23C18/04C23C18/12
Inventor 胡平王快社杨帆谭江飞于志涛康轩齐赵叶曼
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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