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A method for preparing nano-diamond with high-current pulsed electron beam

A nano-diamond, high-current pulse technology, applied in diamond, nanotechnology, nanotechnology and other directions, can solve the problems such as pressure and temperature cannot be controlled separately, short action time of dynamic method, etc. The effect of high energy density

Inactive Publication Date: 2018-06-08
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The pressure of the static high temperature and high pressure method is 3-10GPa, and the temperature is 1000-2000°C; the dynamic method has a short action time, and the pressure and temperature cannot be controlled separately

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Cleaning: Disperse the nano-carbon in ethanol solution, sonicate for 8 minutes, filter, put in 10% NaOH solution and sonicate for 6 minutes, wash and dry repeatedly with deionized water.

[0018] (2) Coarsening treatment: place the cleaned nano-carbon in a mixed roughening solution of 160g / L ammonium peroxodisulfate and 80ml / L sulfuric acid, stir it electromagnetically for 6 minutes at room temperature, wash it with deionized water until neutral after roughening, Dry and set aside.

[0019] (3) Electroless nickel plating: The electroless nickel plating solution includes nickel chloride (30g / L), sodium hypophosphite (10g / L), sodium glycolate (50g / L), boric acid (5g / L), etc. After the temperature of the electroless nickel plating solution reaches 88-92°C, place the roughened nano-carbon in the plating solution, deposit it for 20 seconds, take it out, wash it repeatedly with deionized water and dry it.

[0020] (4) The nanocarbon without nickel plating is mixed with t...

Embodiment 2

[0024] (1) The direct current arc plasma method is adopted, the bulk Ni with a purity of 99.99% is used as the anode, and the graphite rod is used as the cathode. Evacuate the reaction chamber to 1 × 10 -5 After Pa, feed methane 1-5×10 4 Pa, adjust the electrode distance, add voltage to generate arc discharge between the two electrodes, the discharge current is 90A, and the voltage is 40V. Metal particles nucleate and grow up in the carbon-containing atmosphere, and condense on the wall of the water-cooled chamber, and collect nano-powder after passivation treatment.

[0025] (2) Disperse the carbon-coated nanopowder in the alcohol solution, filter and dry after ultrasonic vibration for 6 minutes. Press the processed nano-powder into flakes at a pressure of 30 MPa and keep for 6 minutes.

[0026] (3) Fix the sheet sample on the target and vacuumize to 1×10 -5 After above a, start bombarding the sample with electron beam, bombarding 12 times. Among them, the electron beam ...

Embodiment 3

[0029] (1) Cleaning: Disperse the nano-carbon in ethanol solution, sonicate for 8 minutes, filter, put in 10% NaOH solution and sonicate for 6 minutes, wash and dry repeatedly with deionized water.

[0030] (2) Coarsening treatment: place the cleaned carbon nanopowder in a mixed roughening solution of 160g / L ammonium peroxodisulfate and 80ml / L sulfuric acid, stir it electromagnetically for 6 minutes at room temperature, wash it with deionized water until neutral after roughening , dried for later use.

[0031] (3) Electroless iron plating: The electroless iron plating solution includes ammonium ferrous sulfate (16g / L), sodium borohydride (3.2g / L), sodium citrate (60g / L), lactic acid (20g / L), propionic acid (10g / L), boric acid (2g / L), saccharin (0.5g / L), betaine (0.2g / L). After the temperature of the electroless iron plating solution reaches 48-52°C, place the roughened carbon nano powder in the plating solution, deposit it for 30 seconds, take it out, wash it repeatedly with ...

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Abstract

The invention belongs to the technical field of advanced material preparation, and provides a method for preparing nanodiamond by means of high-current pulsed electron beams. The method comprises the steps that nanocarbon is selected as a raw material, and a metal catalyst is added through the two processes that 1, the metal catalyst is deposited on the nanocarbon by adopting a chemical plating method, and the nanocarbon plated with the metal catalyst and nanocarbon are mixed; 2, in a carbon containing atmosphere, arc discharge is conducted to evaporate the metal catalyst, and carbon coating metal nanoparticles are obtained; treated mixed powder is pressed into flakes for 1 min to 10 min under the pressure of 20 MPa to 50 MPa and then bombarded 5 times to 15 times through an electron cannon under the condition that the current intensity of the electron beams is 10 kA, the energy of the electron beams is 27 keV, and the pulse width of the electron beams is 3 microseconds to 6 microseconds after being pressed into the flakes, and finally collection and purification are conducted. According to the method, the catalytic effect of the catalyst can be improved to the maximum limit through the adding mode of the metal catalyst; the electron beams are high in energy density, micro-area phase changes are more beneficial for diamond conversation, and the conversion rate is increased.

Description

technical field [0001] The invention belongs to the technical field of advanced material preparation, and relates to the interaction between high-energy particle beams and materials and the change of material phase structure. In particular, it involves the pretreatment of carbon nanomaterials, under the bombardment of high-energy electron beams, making them meet the thermodynamic and kinetic conditions of high-temperature and high-pressure diamond growth at the microscopic level, so that carbon materials can be transformed into nano-diamond particles. Background technique [0002] Diamond has many excellent properties, such as high hardness, high thermal conductivity, high optical transparency, insulation, etc., so it has broad application prospects in machinery, energy, electronics, aerospace and other fields. At present, there are many methods for preparing diamond, including liquid phase method, liquid phase method and solid phase method, etc. The prepared diamond mainly ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/26B82Y30/00
CPCB82Y30/00
Inventor 张贵峰郝胜智黄昊
Owner DALIAN UNIV OF TECH
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