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Preparation method for nickel molybdenum aluminum-molybdenum disilicide composite coating

A technology of molybdenum disilicide and composite coating, which is applied in coatings, electrolytic coatings, etc., and can solve the problems of poor resistance to high temperature oxidation and corrosion

Inactive Publication Date: 2016-01-06
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the above-mentioned technical problems in the prior art, the present invention provides a method for preparing a nickel-molybdenum-aluminum-molybdenum-disilicide composite coating, which solves the problem of the existing The technical problem that the adhesive layer material in the technology is not effective in resisting high temperature oxidation corrosion

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Weigh 3g of molybdenum disilicide particles with a particle size of 10μm in a 100mL beaker, add 5mL of acetone, stir for 5min, filter with suction, put the molybdenum disilicide particles in a 50mL beaker, add 6mol. L -1 Soak 5mL of hydrochloric acid solution for 0.2h, filter with suction, wash with water until neutral, and dry in an oven at 50°C for 5h. Add 5g nickel nitrate, 4g nickel sulfate, 9g ammonium molybdate, 9g aluminum sulfate, 2g glycolic acid, 2g citric acid, 9g ammonium chloride into a 2L beaker, add 985mL water to dissolve to form nickel nitrate-nickel sulfate-ammonium molybdate -Aluminum sulfate-glycolic acid-citric acid-ammonium chloride mixed solution, adjust the pH value of the solution to 7.3 with sodium carbonate solution, transfer it to a 1L volumetric flask, and dilute with water to the mark. Put the molybdenum disilicide particles treated above in a mortar, add 0.009g polyethylene glycol 6000 surfactant, 6mL nickel nitrate-nickel sulfate-ammoniu...

Embodiment 2

[0016] Weigh 60g of molybdenum disilicide particles with a particle size of 10nm in a 200mL beaker, add 100mL of acetone, stir for 5min, filter with suction, put the molybdenum disilicide particles in a 200mL beaker, add 1mol. L -1 100mL hydrochloric acid solution, soak for 1h, filter with suction, wash with water until neutral, and dry in an oven at 100°C for 0.5h. Add 205g nickel chloride, 200g nickel nitrate, 805g sodium molybdate, 150g aluminum trichloride, 205g aluminum sulfate, 30g glycine, 75g oxalic acid, 305g sodium chloride into a 2L beaker, add 985mL water to dissolve and form nickel chloride -Nickel nitrate-sodium molybdate-aluminum trichloride-aluminum sulfate-glycine-oxalic acid-sodium chloride mixed solution, adjust the pH value of the solution to 9.7 with sodium carbonate solution, transfer it to a 1L volumetric flask, and dilute with water to the mark. Put the molybdenum disilicide particles treated above in a mortar, add 0.45g of cetylpyridinium bromide and ...

Embodiment 3

[0018] Weigh 30g of molybdenum disilicide particles with a particle size of 5 μm in a 100mL beaker, add 50mL of acetone, stir for 5min, filter with suction, put the molybdenum disilicide particles in a 100mL beaker, add 3mol. L -1 Soak 50mL of hydrochloric acid solution for 0.6h, filter with suction, wash with water until neutral, and dry in an oven at 75°C for 3h. In a 2L beaker, add 203g nickel nitrate, 200g molybdenum pentachloride, 203g ammonium phosphomolybdate, 178g aluminum trichloride, 10g lactic acid, 10g malic acid, 10g succinic acid, 23g tartaric acid, 53g potassium chloride, 100g chlorine Ammonium chloride, add 985mL water to dissolve to form nickel nitrate-molybdenum pentachloride-ammonium phosphomolybdate-aluminum trichloride-lactic acid-malic acid-succinic acid-tartaric acid-potassium chloride-ammonium chloride mixed solution, use sodium carbonate Solution Adjust the pH value of the solution to 8.3, transfer it into a 1L volumetric flask, and dilute with water ...

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Abstract

The invention relates to a preparation method for a nickel molybdenum aluminum-molybdenum disilicide composite coating. The preparation method includes the steps that molybdenum disilicide particles are subjected to acid pickling, washing and drying; nickel salt, molybdenum compounds, aluminum salt, complexing agents and chloride are weighed, mixed and then dissolved in water, the pH value of the solution is regulated to be 7.3-9.7, and the nickel salt-molybdenum compound-aluminum salt-complexing agent-chloride mixed solution is obtained; the molybdenum disilicide particles, a first batch of the nickel salt-molybdenum compound-aluminum salt-complexing agent-chloride mixed solution and surface active agents are mixed and ground, then a second batch of the nickel salt-molybdenum compound-aluminum salt-complexing agent-chloride mixed solution is added, and an electroplating solution is obtained through stirring; and a part to be electroplated is placed in the electroplating solution to be electroplated, nickel is adopted as an anode, nickel alloy to be electroplated is adopted as a cathode, after electroplating is completed, the electroplated part is washed through water and air-dried, and therefore the nickel molybdenum aluminum-molybdenum disilicide composite coating is obtained. The aluminum content and the silicon content of the nickel molybdenum aluminum-molybdenum disilicide composite coating are measured to be 2.5%-9.2% and 1.2%-6.5% respectively through an energy dispersive spectrometer.

Description

technical field [0001] The invention belongs to the field of chemical industry and relates to a thermal coating technology, in particular to a preparation method of a nickel-molybdenum-aluminum-molybdenum disilicide composite coating. Background technique [0002] At present, the practical way to greatly increase the operating temperature of aero-engines is to use thermal barrier coating technology. Most of the thermal barrier coatings that have been applied in practice have a double-layer structure, and the ceramic layer is used as the surface layer of the thermal barrier coating because of its heat insulation, corrosion resistance, erosion and erosion properties. Due to the thermal expansion coefficient mismatch between ceramics and high-temperature structural materials, a metal bonding layer is required to resist high-temperature oxidation corrosion and improve the physical compatibility between the substrate and the ceramic coating, and the metal bonding layer is the bot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/56C25D15/00
Inventor 刘小珍冯军亮陈捷
Owner SHANGHAI INST OF TECH
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