Preparation method of boron nitride nano-tube

A technology of boron nitride nanotubes and compounds, which is applied in the field of preparation of boron nitride nanotubes, can solve the problems of low purity of boron nitride nanotubes and unfavorable large-scale preparation of boron nitride nanotubes, and achieve good mechanical strength and preparation The effect of simple process and low energy consumption

Inactive Publication Date: 2010-07-28
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of the above two preparation methods is that it is not conducive to the preparation of boron nitride nanotubes in large quantities, and the purity of boron nitride nanotubes is low

Method used

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Embodiment 1

[0031] According to the material dry mixing and sintering process, Mg is used as the magnesium source, Fe(OH) 3 is the iron source, H 3 BO 3 As the boron source, the preparation steps of the inorganic porous ceramic material are as follows. The first step ingredients: Mg, Fe(OH) 3 、H 3 BO 3 All are analytical reagents, weighing 19.56g Mg, 28.51g Fe(OH) 3, 16.54gH 3 BO 3 , wherein the molar ratio Mg:Fe:B is 1:0.33:0.33. The second step of mixing: the weighed Mg, Fe(OH) 3 and H 3 BO 3 Add a high-speed mixer (18000 rpm) and mix for 5 minutes to make it fully uniform. The third step of molding: Pour the mixture into a steel mold, use a 500-ton press, hold the pressure for 18 minutes, shape it, and take it out. The fourth step is reaction sintering: put the formed material into the reaction tank without sealing. Put the reaction tank into a heating furnace, keep it warm at 650°C for 20 minutes, cool naturally, open the tank and take out the product, which has a black h...

Embodiment 2

[0033] According to the material ball milling and sintering process, Mg(OH) 2 , Mg is magnesium source, ferric nitrate is iron source, B 2 o 3 As the boron source, the preparation steps of the inorganic porous ceramic material are as follows. The first step ingredients: Mg(OH) 2 , Mg, Fe(NO3) 3 , B 2 o 3 All are analytical reagents, weigh 15.31g Mg(OH) 2 , 38.31g Mg, 63.46g Fe(NO3) 3 , 36.55g B 2 o 3 , wherein the molar ratio Mg:Fe:B is 1:0.14:0.57. The second step of ball milling: Pour the prepared raw materials into the steel ball mill tank, adjust the parameters of the ball mill, rotate at 500 rpm, revolution at 250 rpm, and mill for 16 hours. The third step of molding: pour the ball mill material into a steel mold, and use a 500-ton press to hold the pressure for 18 minutes. The fourth step is reaction sintering: put the formed material into the reaction tank without sealing. The reaction tank was placed in a heating furnace, kept at 700°C for 15 minutes, coole...

Embodiment 3

[0035] According to the liquid phase composite and sintering process, MgCO 3 , Mg is magnesium source, FeCl 3 , iron boron (FeB 1.3 ), B 2 o 3 The preparation process of MgFeBO inorganic porous ceramic material is introduced for iron source and boron source. The first step ingredients: MgCO 3 , Mg, FeCl 3 , ferroboron powder, B 2 o 3 All are analytical reagents, weigh 8.06g MgCO 3 , 20.93g Mg, 15.51g FeCl 3 , 50g ferroboron powder, 20.01gB 2 o 3 , wherein the molar ratio Mg:Fe:B is 1:0.85:1.58. The second step of reaction coating: pour the weighed material into a 1000ml beaker, add 40g of concentrated ammonia water with a mass fraction of 25-28%, and stir for 5 hours. The third step is water removal and pulverization process: the mixed solution is suction filtered and washed. The filter cake was dried in a vacuum oven at 80°C for 6 hours, then taken out and pulverized. The fourth step of molding: Pour the mixture into a steel mold, and use a 500-ton press to keep...

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Abstract

The invention relates to a preparation method of a boron nitride nano-tube, comprising the steps of: leading inorganic porous ceramic material and ammonia to have ammoniation reaction for 5-24h at 800-1200 DEG C, and obtaining crude product of the boron nitride nano-tube, wherein the element mole ratio in the inorganic porous ceramic material is Mg: Fe: B: O= 1: (0.10-1.65): (0.33-1.95): (0.5-5); and separating and purifying the obtained crude product, and obtaining the boron nitride nano-tube. The preparation method has the advantages that (1) batch preparation of the boron nitride nano-tube product can be realized, the yield is more than 80%, and the purity is about 85%; the preparation technique is simple, the power consumption is lower, and the method is suitable for industrial batch production; and (2) the adopted inorganic porous ceramic material has good mechanical strength at higher temperature and can be taken as filler, and compared with other powder or block raw material, the inorganic porous ceramic material is more beneficial to preparing the boron nitride nano-tube by gas-solid phase reaction.

Description

technical field [0001] The invention relates to the field of nanomaterial preparation, in particular to a method for preparing boron nitride nanotubes. Background technique [0002] Boron nitride nanotubes have a similar structure to carbon nanotubes. In 1994, Rubio et al. predicted the existence of boron nitride nanotubes theoretically. In 1995, Chopra et al. successfully synthesized boron nitride nanotubes, thus opening the Prelude to the study of boron nanotubes. Boron nitride nanotubes have excellent chemical stability and heat resistance. Theoretical and experimental studies have shown that they are wide-gap semiconductors, and their electrical properties are not affected by their nanotube diameter and chirality. Boron nitride nanotubes also have high toughness and high strength comparable to carbon nanotubes, and can be used for reinforcement, toughening and modification of materials. The unique properties of boron nitride nanotubes have important application value i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/583C04B35/622
Inventor 谷云乐王吉林潘新叶
Owner WUHAN INSTITUTE OF TECHNOLOGY
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