Preparation method of B4C nanosheet and B4C nanosheet

A nanosheet and boric acid technology, applied in nanotechnology and other directions, can solve the problem of inability to form regularly arranged boron carbide nanosheets, and achieve the effects of excellent interface wettability, high yield and purity, and fast reaction speed.

Active Publication Date: 2016-11-09
ZHENGZHOU UNIVERSITY OF AERONAUTICS
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AI Technical Summary

Problems solved by technology

This method takes advantage of the excellent absorbing properties of carbon to achieve B 4 C whiskers are rapidly synthesized; however, the method yields B 4 C whiskers are fibrous materials with a diameter of 15-100nm and an aspect ratio of 10-50, which also cannot form regularly arranged boron carbide nanosheets

Method used

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  • Preparation method of B4C nanosheet and B4C nanosheet
  • Preparation method of B4C nanosheet and B4C nanosheet
  • Preparation method of B4C nanosheet and B4C nanosheet

Examples

Experimental program
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Embodiment 1

[0040] B of this embodiment 4 The preparation method of C nanosheet includes the following steps:

[0041] 1) According to the mass ratio of 4:1, take 40g of boric acid and 10g of coal powder into the ball mill tank of the planetary ball mill, and add 5g of sodium carbonate (the added mass of sodium carbonate is 10% of the total mass of boric acid and coal powder) and 150ml of ethanol, wet ball milling with a planetary ball mill at a ball-to-battery ratio of 10:1 and a rotating speed of 150r / min for 1h, mix well and dry at 90°C to obtain a mixed powder of boric acid-coated coal powder;

[0042] 2) Pre-press the mixed powder obtained in step 1) into flakes under 5 MPa, and then perform cold isostatic pressing at 150 MPa for 0.5 min to obtain flakes;

[0043] 3) Embed the flakes obtained in step 2) in quartz sand contained in an alumina crucible, and place the crucible together with its contents in the resonant cavity of a multi-mode microwave sintering furnace with a frequency of 2.45...

Embodiment 2

[0047] B of this embodiment 4 The preparation method of C nanosheet includes the following steps:

[0048] 1) According to the mass ratio of 3:1, take 30g of boric acid and 10g of coal powder into the ball mill tank of the planetary ball mill, and add 2g of sodium carbonate (the added mass of sodium carbonate is 5% of the total mass of boric acid and coal powder) and 100ml of ethanol, wet ball milling with a planetary ball mill under the conditions of a ball-to-material ratio of 10:1 and a rotating speed of 150r / min for 2h, mix well and dry at 100°C to obtain a mixed powder of boric acid-coated coal powder;

[0049] 2) Pre-press the mixed powder obtained in step 1) into flakes under 5 MPa, and then subject to 180 MPa cold isostatic pressing for 1 min to obtain flakes;

[0050] 3) Embed the flakes obtained in step 2) in quartz sand contained in an alumina crucible, and place the crucible together with its contents in the resonant cavity of a multi-mode microwave sintering furnace with...

Embodiment 3

[0054] B of this embodiment 4 The preparation method of C nanosheet includes the following steps:

[0055] 1) According to the mass ratio of 3:1, take 30g of boric acid and 10g of coal powder into the ball mill tank of the planetary ball mill, and add 4g of sodium bicarbonate (the added mass of sodium carbonate is 10% of the total mass of boric acid and coal powder) 100ml of ethanol and 100ml of ethanol, use a planetary ball mill at a ball-to-material ratio of 10:1 and a rotating speed of 150r / min to perform wet ball milling for 1.5 hours, mix well and dry at 105°C to obtain a boric acid-coated coal powder mixed powder ;

[0056] 2) Pre-press the mixed powder obtained in step 1) into a sheet shape at 5 MPa, and then subject it to 160 MPa cold isostatic pressing for 0.5 min to obtain a sheet;

[0057] 3) Embed the flakes obtained in step 2) in quartz sand contained in an alumina crucible, and place the crucible together with its contents in the resonant cavity of a multi-mode microwa...

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Abstract

The invention discloses a preparation method of a B4C nanosheet and the B4C nanosheet. The preparation method comprises: 1) taking boric acid, coal dust and sodium carbonate or sodium bicarbonate to conduct ball-milling to obtain mixed powder, wherein the adding mass of sodium carbonate or sodium bicarbonate accounts for 3%-10% of the total mass of boric acid and coal dust; 2) subjecting the obtained mixed powder to pre-press molding, and then performing cold isostatic pressing to obtain flake object; and 3) imbedding the obtained flake object into quartz sand to conduct microwave sintering, thus obtaining the B4C nanosheet. According to the method, boric acid, coal dust and sodium carbonate or sodium bicarbonate are subjected to ball-milling mixing, pre-press molding and cold isostatic pressing are carried out, then the product is subjected to microwave sintering, by utilizing the excellent wave-absorbing properties of carbon and the plasma effect of gas during microwave sintering, the method realizes rapid synthesis of B4C nanosheet. The obtained B4C nanosheet has good crystallinity, small thickness, and high yield and purity; the sintering time is short, the sintering temperature is low, and a lot of energy is saved. The process is simple, is convenient to operate, and is suitable for industrial rapid production, thus having broad application prospects.

Description

Technical field [0001] The invention belongs to the technical field of superhard materials, and specifically relates to a B 4 The preparation method of C nanosheets also relates to a kind of B 4 C Preparation method of nanosheets 4 C nano sheet. Background technique [0002] B 4 C (boron carbide), commonly known as synthetic diamond, belongs to the hexagonal crystal system. It has a high melting point, low density, stable chemical properties, excellent neutron absorption capacity, and excellent thermal and electrical properties. The Mohs hardness reaches 9.3, except for diamond and cubic The hardest substance besides boron nitride. Boron carbide occupies a pivotal position in ceramic materials due to its excellent physical and chemical properties. It can not only be used to make various wear-resistant parts, protective armor, high-temperature semiconductors, electromagnetic shielding materials, etc., in aerospace, nuclear industry and medicine. The medical aspect also has outsta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/36B82Y40/00
CPCC01P2002/72C01P2004/03C01P2004/62C01P2004/64
Inventor 张锐范冰冰邵刚王海龙李春光郭晓琴樊磊张世豪宋博震
Owner ZHENGZHOU UNIVERSITY OF AERONAUTICS
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