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A kind of ultra-high hardness refractory metal nanocrystalline coating and preparation method thereof

A technology of refractory metals and nanocrystals, applied in the direction of nanotechnology, can solve the problems of lack of effective preparation methods for refractory metal nanocrystals, and achieve the effects of low cost, excellent mechanical properties, and simple preparation methods

Active Publication Date: 2019-06-14
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the lack of effective preparation methods for refractory metal nanocrystals at present, the present invention provides a refractory metal molybdenum nanocrystal coating with low preparation cost and simple preparation process and a preparation method thereof. The metal molybdenum coating prepared by this method is dense , and well combined with the substrate, its average grain size is 4-200nm, Vickers hardness is 8-18GPa, it has excellent mechanical properties and thermal stability, and can be applied to copper, nickel and its alloys, as well as metal materials such as stainless steel wear protection

Method used

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  • A kind of ultra-high hardness refractory metal nanocrystalline coating and preparation method thereof
  • A kind of ultra-high hardness refractory metal nanocrystalline coating and preparation method thereof
  • A kind of ultra-high hardness refractory metal nanocrystalline coating and preparation method thereof

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Embodiment 1

[0029] 1), electroplating molybdenum oxygen alloy coating:

[0030] With the platinum sheet as the anode and the copper as the cathode, prepare 1000mL plating solution according to the requirements. The composition of the plating solution is:

[0031] Sodium molybdate dihydrate 5g / L, ammonium acetate 270g / L, potassium acetate 370g / L, glacial acetic acid 200mL / L, weigh the above drugs with a balance, dissolve them in deionized water, stir and dissolve, filter paper, and then put the plating solution Stir with a magnetic stirrer, the temperature is controlled at 50±2°C, and the pH value is 6.75±0.20. The current density is 0.4A / cm 2 , Plating time is 24 hours. Finally, the cross-sectional view and surface morphology of the coating as figure 1 As shown, the thickness of the coating is about 10 μm, and it is dense and free of holes. The composition of the coating is analyzed to be 97.1wt.% molybdenum and 2.9wt.% oxygen. The XRD curve of the coating shows that there is an obvio...

Embodiment 2

[0036] 1), electroplating molybdenum oxygen alloy coating

[0037] With the platinum sheet as the anode and the nickel as the cathode, prepare 1000mL plating solution according to the requirements. The composition of the plating solution is:

[0038] Sodium molybdate dihydrate 10g / L, ammonium acetate 290g / L, potassium acetate 340g / L, glacial acetic acid 200mL / L, weigh the above drugs with a balance, dissolve them in deionized water, stir and dissolve, filter with filter paper, and then put the plating solution Stir with a magnetic stirrer, the temperature is controlled at 50±2°C, and the pH value is 6.75±0.20. The current density is 1.0A / cm 2 , Plating time is 10 hours. Finally, the cross-sectional view and surface morphology of the coating as figure 1 As shown, the thickness of the coating is about 10 μm, and it is dense and free of holes. The composition of the coating is analyzed to be 97.1wt.% molybdenum and 2.9wt.% oxygen. The coating microstructure transforms from am...

Embodiment 3

[0043] 1), electroplating molybdenum oxygen alloy coating

[0044] With the platinum sheet as the anode and the 304L stainless steel as the cathode, prepare 1000mL plating solution according to the requirements. The composition of the plating solution is:

[0045] Sodium molybdate dihydrate 5g / L, ammonium acetate 280g / L, potassium acetate 350g / L, glacial acetic acid 230ml / L, weigh the above medicines with a balance, dissolve them in deionized water, then stir the plating solution with a magnetic stirrer, After stirring and dissolving, filter with filter paper, then stir the plating solution with a magnetic stirrer, the temperature is controlled at 50±2°C, and the pH value is 6.75±0.20. The current density is 2.5A / cm 2 , Plating time is 5h. Finally, the cross-sectional view and surface morphology of the coating as figure 1 As shown, the thickness of the coating is about 10 μm, and it is dense and free of holes. The composition of the coating is analyzed to be 98wt.% molybden...

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Abstract

The invention provides an ultra-high hardness refractory metal nanocrystalline cladding layer and a preparation method thereof. Firstly, a molybdenum oxygen alloy cladding layer with a micron-order thickness is electroplated to a metal substrate through an electro-deposition technology; and then, the cladding layer is put in hydrogen flow to be subjected to reduction annealing, and the high-hardness and high-thermal-stability refractory metal nanocrystalline cladding layer is acquired. The cladding layer is provided with isometric crystal structures which are evenly distributed, the average crystallite size ranges from 4 nm to 200 nm, the hardness can be highest to 18 Gpa and is four times or above of coarse grained molybdenum. The prepared refractory metal nanocrystalline cladding layer has excellent mechanical performance and thermal stability, and compared with other methods for preparing the refractory metal cladding layer, the preparation method has the beneficial effects that the preparation cost is low, and the preparation procedures are simple. The ultra-high hardness refractory metal nanocrystalline cladding layer can be applied to abrasion-resisting protection of copper, nickel, alloys of the copper and nickel, stainless steel and other metal materials.

Description

technical field [0001] The invention relates to the fields of preparation of refractory metal nanomaterials and coating protection, and in particular provides an ultrahigh hardness refractory metal nanocrystalline coating and a preparation method thereof. Background technique [0002] As a refractory metal, the transition group metal molybdenum has a high melting point (2623 ° C), second only to five elements of tantalum, tungsten, rhenium, osmium and carbon, and a low linear expansion coefficient (4.8×10 -6 / °C), is half of most steel, high thermal conductivity and electrical conductivity, several times that of many superalloys, only half of copper thermal conductivity, and high high temperature strength. Molybdenum is widely used in military and civilian fields in the form of alloys, such as solid propellant rocket parts, honeycomb structure parts, tubes for sodium circuits in fast neutron breeder reactors, targets in X-ray instruments, etc. [0003] Nanocrystalline mater...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D3/56C25D5/50B82Y40/00
CPCB82Y40/00C25D3/56C25D5/50
Inventor 潘杰段峰辉李毅
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI