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Preparation method of boron carbide nanosheet

A technology of nanosheets and boron carbide, which is applied in the field of preparation of boron carbide nanosheets, can solve the problems of short synthesis process, high purity, and inability to form regularly arranged boron carbide nanosheets, and achieve process controllability, high purity, and shortened gas flow The effect of crushing time

Inactive Publication Date: 2021-03-26
沧州硕金生物科技有限公司
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  • Description
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  • Application Information

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Problems solved by technology

The method utilizes pulse current to carry out carbothermal reduction reaction under the conditions of high heating rate and short holding time. The synthesis process is short, the purity is high, and there is no post-decarbonization treatment. The average particle size of the powder is within the range of 100-500nm. Unable to form regularly arranged boron carbide nanosheets

Method used

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  • Preparation method of boron carbide nanosheet
  • Preparation method of boron carbide nanosheet
  • Preparation method of boron carbide nanosheet

Examples

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Embodiment 1

[0036] Embodiment 1: A kind of preparation method of boron carbide nanosheet

[0037] This embodiment provides a method for preparing boron carbide nanosheets, comprising the following steps:

[0038] 1) First mix boric acid and polyvinyl alcohol (polymerization degree: 1700) according to the molar ratio of 5:1, add 2% magnesium oxide and silicon dioxide mixture with a mixing ratio of 7:3, and put the mixture into vacuum freeze-drying Freeze-dry in the machine, control the freeze-dryer at -40°C, vacuum at 20Pa, and freeze-dry for 4 hours;

[0039] 2) Then add the mixed powder to the jet mill at a feeding speed of 110g / min, add a mixture of triethanolamine and coke at a rate of 0.5% by weight of the powder as a grinding aid, and the mixing ratio of triethanolamine and coke is 1:5 , pulverize for 60s, keep the pressure inside the jet mill at 1.5MPa, the temperature at 20°C, and the air velocity at 180m / s; then pulverize the powder for the second time, adding 1.2% of the powder we...

Embodiment 2

[0042] Embodiment 2: Another kind of preparation method of boron carbide nanosheet

[0043] Example 2 is basically the same as Example 1, except that the carbon source in Example 2 is polyethylene with a polymerization degree of 1700.

Embodiment 3

[0044] Embodiment 3: Another kind of preparation method of boron carbide nanosheet

[0045] Example 3 is basically the same as Example 1, except that the carbon source in Example 3 is polypropylene with a degree of polymerization of 1700.

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Abstract

The invention belongs to the technical field of superhard materials, and particularly relates to a preparation method of a boron carbide nanosheet. The preparation method comprises the following steps: mixing raw materials, carrying out freeze drying, carrying out jet milling and mixing, carrying out pre-pressing molding and isostatic cool pressing to obtain a sheet, and carrying out spark plasmasintering to obtain the boron carbide nanosheet. According to the method, a spark plasma sintered body is subjected to heating and surface activation, so the ultra-fast densified sintering of a material is realized; and therefore, the nanosheet with high purity, high density and few defects can be prepared, operation is simple, energy consumption is low, synthesis time is short, large-scale production can be realized, and defects in the prior art are overcome.

Description

technical field [0001] The invention belongs to the technical field of superhard materials, and in particular relates to a preparation method of boron carbide nanosheets. Background technique [0002] Boron carbide, also known as black diamond, is usually gray-black micropowder and is one of the three hardest materials known (the other two are diamond and cubic boron nitride). Because of its low density, high strength, high temperature stability and good chemical stability, it is widely used in wear-resistant materials, ceramic reinforcement phases, especially in light armor, reactor neutron absorbers, etc. In addition, compared with diamond and cubic boron nitride, boron carbide is easy to manufacture and low in cost, so it is more widely used. [0003] Two-dimensional nanosheets are a class of inorganic materials with a two-dimensional planar structure, lateral dimensions ranging from several nanometers to several micrometers, but a thickness of only a few tenths or a few...

Claims

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Application Information

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IPC IPC(8): C01B32/991B82Y40/00
CPCB82Y40/00C01P2002/72C01P2004/20C01P2006/10C01P2006/80C01B32/991
Inventor 不公告发明人
Owner 沧州硕金生物科技有限公司
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