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Nano twin-crystal nickel with extremely small twin-crystal lamella thickness and ultrahigh strength and preparation thereof

A nano-twin, lamellar thickness technology, applied in the fields of nanotechnology, nanotechnology, nanotechnology for materials and surface science, can solve problems such as low hardness, limit industrial applications, etc., achieve high thermal stability, microstructure The effect of excellent, high thermal and mechanical stability

Active Publication Date: 2020-10-30
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

Therefore, the lower hardness limits its industrial application

Method used

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  • Nano twin-crystal nickel with extremely small twin-crystal lamella thickness and ultrahigh strength and preparation thereof
  • Nano twin-crystal nickel with extremely small twin-crystal lamella thickness and ultrahigh strength and preparation thereof
  • Nano twin-crystal nickel with extremely small twin-crystal lamella thickness and ultrahigh strength and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1) Preparation of nano-twinned nickel with extremely small twinned layer thickness by electrolytic deposition

[0032] Electrodeposition equipment: DC power supply

[0033] Electrolyte solution formula: 200g / L nickel sulfate hexahydrate, 30g / L nickel chloride hexahydrate, 40g / L boric acid; additives are sodium lauryl sulfate 0.05g / L, sodium saccharin 2.5g / L, 1,4 butyl Alkyne diol 0.64g / L, glacial acetic acid 0.05g / L; all the above reagents were dissolved in deionized water, stirred and dissolved, and then filtered through filter paper; adjust the pH value to 3.5 with 10% dilute sulfuric acid;

[0034] Cathode and anode requirements: the anode is a pure nickel plate with a purity of 99.6wt.%, and the cathode is a nickel substrate after surface degreasing and sensitization treatment.

[0035] 2) Electrolysis process parameters: DC current density is 30mA / cm 2 , The temperature of the electrolyte is 70±1°C, the area ratio of cathode and anode is 1:50, the distance betwee...

Embodiment 2

[0042] 1) Preparation of nano-twinned nickel with extremely small twinned layer thickness by electrolytic deposition

[0043] Electrodeposition equipment: DC power supply

[0044] Electrolyte solution formula: 250g / L nickel sulfate hexahydrate, 40g / L nickel chloride hexahydrate, 40g / L boric acid; additives are sodium lauryl sulfate 0.06g / L, sodium saccharin 2.0g / L, 1,4 butyl Alkyne diol 0.74g / L, glacial acetic acid 0.07g / L; all the above reagents were dissolved in deionized water, stirred and dissolved, and then filtered through filter paper; adjust the pH value to 3.8 with 10% dilute sulfuric acid;

[0045] Cathode and anode requirements: the anode is a pure nickel plate with a purity of 99.6wt.%, and the cathode is a nickel substrate after surface degreasing and sensitization treatment.

[0046] 2) Electrolysis process parameters: DC current density is 70mA / cm 2 , the temperature of the electrolyte is 65±1°C, the area ratio of cathode and anode is 1:50, the distance betwee...

Embodiment 3

[0049] 1) Preparation of nano-twinned nickel with extremely small twinned layer thickness by electrolytic deposition

[0050] Electrodeposition equipment: DC power supply

[0051] Electrolyte solution formula: 350g / L nickel sulfate hexahydrate, 50g / L nickel chloride hexahydrate, 50g / L boric acid; additives are sodium lauryl sulfate 0.1g / L, sodium saccharin 1.25g / L, 1,4 butyl Alkyne diol 0.64g / L, glacial acetic acid 0.07g / L; all the above reagents were dissolved in deionized water, stirred and dissolved, and then filtered through filter paper; adjust the pH value to 4.0 with 10% dilute sulfuric acid;

[0052] Cathode and anode requirements: the anode is a pure nickel plate with a purity of 99.6wt.%, and the cathode is a nickel substrate after surface degreasing and sensitization treatment.

[0053] 2) Electrolysis process parameters: DC current density is 50mA / cm 2 , the electrolyte temperature is 60±1°C, the area ratio of cathode and anode is 1:50, the distance between catho...

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Abstract

The invention relates to a superhard nanocrystal metal material, in particular to nano twin-crystal nickel with extremely small twin-crystal lamella thickness and ultrahigh strength and a preparationmethod thereof. The nano twin-crystal nickel with a thickness of hundreds of microns to millimeters is prepared by utilizing an electrolytic deposition technology, wherein a microstructure of the nanotwin-crystal nickel is composed of columnar crystal particles with lengths of 200-3000 nm and widths of about 10-50 nm, twin-crystal lamella structures with high density and consistent orientation are contained in columnar crystals, a thickness of each twin-crystal lamella structure is 0.5-10 nm, the crystal particles with the twin-crystal structures can account for 100% of the crystal particlesof a whole sample, a room-temperature microhardness of a material can reach 8.5 GPa or above and is 1.5-2 times or above that of common electroplating nano nickel, and after annealing is carried out at 250 DEG C for half an hour, the hardness is increased to 9.6 GPa and a structure roughening temperature can reach 350 DEG C or above and is 150 DEG C or above higher than a structure roughening temperature of common nanocrystal nickel. A prepared nanocrystal coating can be applied to wear-resistant protection of metal materials such as copper, nickel, alloys of the copper and nickel, and stainless steel, and can also be applied to the fields of micromechanical systems (MEMS) and the like.

Description

technical field [0001] The invention relates to the field of preparation of nano-crystalline metal materials and coating protection, and in particular provides nano-twinned nickel with extremely small thickness of twinned wafer layer and ultra-high strength and a preparation method thereof. Background technique [0002] Nickel is a bright silvery white metal with a yellowish tinge. It is easily passivated in the air, has good chemical stability, and is not corroded by water, atmosphere and alkali at room temperature. In addition, nickel has excellent mechanical properties, such as high hardness, good wear resistance, and good ductility. The nickel-plated layer is easy to obtain a bright surface by bright electrodeposition, and is suitable for bright decoration on the surface of steel, aluminum alloy, copper alloy, zinc castings and metallized non-metallic products. Therefore, the nickel coating is one of the most important metal coatings. It is widely used in automobiles,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/16B82Y30/00B82Y40/00
CPCC25D3/16B82Y30/00B82Y40/00
Inventor 潘杰段峰辉李毅
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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