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Push-boat-type semi-continuous boron nitride nanotube preparation furnace and application method thereof

A boron nitride nanotube, semi-continuous technology, applied in chemical instruments and methods, nitrogen compounds, inorganic chemistry, etc., can solve the problem that the synthesis of BNNTs is not too large, the effective utilization rate of reducing gas is not high, and the exhaust gas cannot be effectively treated. and other problems, to achieve the effect of continuous large-scale synthesis, rich and diverse product structure, avoiding repeated opening times and idle time

Active Publication Date: 2019-05-28
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN201359434Y discloses a push boat type two-tube reduction furnace, which is used for the reduction of metal powder, but on the one hand, the structure of the device is relatively complicated, with many temperature control areas and small temperature differences, which is not very suitable for the synthesis of BNNTs Significance; on the other hand, the device does not have a gas circulation system, and the effective utilization rate of the reducing gas is not high
However, this equipment not only cannot create the atmosphere required for the reaction, but also the waste gas generated by the reaction cannot be effectively treated, which has environmental protection problems; in addition, the equipment has different temperature reaction zones, resulting in more heating equipment, and materials need to be advanced in different reaction zones , inconvenient to operate

Method used

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  • Push-boat-type semi-continuous boron nitride nanotube preparation furnace and application method thereof
  • Push-boat-type semi-continuous boron nitride nanotube preparation furnace and application method thereof
  • Push-boat-type semi-continuous boron nitride nanotube preparation furnace and application method thereof

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Embodiment 1

[0030] Utilize the present invention to provide such as figure 1 The method for synthesizing boron nitride nanotubes with smooth inner walls by the shown equipment is as follows:

[0031] Check ahead of time to make sure the overall equipment is in good working order. Start the electric heating device A, set the temperature to heat the furnace 8, and the heating rate is 4-8°C / min. Close the furnace door 3 at the furnace head and the furnace tail door 4, open the exhaust pipe 1 at the furnace head and the inlet pipe 2 at the furnace tail, vacuumize and exhaust the furnace 8, and then continuously transport Ammonia gas, the flow rate of ammonia gas is controlled at 0.4-1.0L / min, and the pipeline gas cycler is kept in the working state. Then put the ceramic boat covered with superfine boron carbide powder into the hearth 8 of the furnace body B to carry out heat preservation reaction, the reaction temperature is 900-1350°C, and the heat preservation time is 10-15h. After the r...

Embodiment 2

[0033] Utilize the present invention to provide such as figure 1 The method for synthesizing bamboo-shaped boron nitride nanotubes with the shown equipment is basically similar to that of Example 1, except that the heating rate is 6-10°C / min, the flow rate of ammonia gas is 0.6-1.2L / min, and the holding temperature is 900°C. -1400℃, holding time 3-6h. The bamboo-shaped BNNTs that embodiment 2 makes has carried out XRD, Raman spectrum, TEM analysis, and the result is as follows Figure 3-5 shown.

[0034] from image 3 It can be seen in the characteristic XRD diffraction spectrum of the BNNTs sample that the characteristic diffraction peaks are very clear, indicating that the sample has a good degree of crystallization. The d values ​​of the characteristic diffraction peaks are at 0.33492, 0.21843, 0.20786 and 0.16693 nm, corresponding to (002), (100), (101) and (004) crystal planes of hexagonal boron nitride, respectively. From this, the unit cell constants of the product ...

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Abstract

The invention relates to a push-boat-type semi-continuous boron nitride nanotube preparation furnace and an application method thereof. The set of device comprises an electric temperature control heating device A, a furnace body B, a furnace head C and a furnace tail D, wherein the electric temperature control heating device A is used for adjusting and controlling the temperature of the furnace body B, hearth in the furnace body B is communicated with the furnace head C and the furnace tail D at the two sides via furnace tubes, and circulation water trays for cooling are arranged on the outersurfaces of the furnace tubes. Raw materials are reacted with ammonia gas in the hearth in the furnace body B, and then transferred to the furnace tubes between the furnace body B and the furnace tailD for cooling, while the next batch of raw materials are conveyed to the hearth for reaction, and the cooled products are taken out from the furnace tail D, thereby achieving continuous production. The push-boat-type semi-continuous boron nitride nanotube preparation furnace has the advantages of convenient operation, rich product structures, particular suitability for industrial production applications, and high safety and stability, and a large scale of BNNTs (Boron Nitride Nanotubes) of different structures can be continuously synthesized.

Description

technical field [0001] The invention relates to the technical field of synthesis of machinery and inorganic non-metallic materials, in particular to a push boat type semi-continuous boron nitride nanotube preparation furnace and a use method thereof. Background technique [0002] The synthesis method of boron nitride (BN) occupies an extremely important position in the research of boron nitride materials. The development of an industrial large-scale synthesis of boron nitride with higher purity can provide a solid foundation and guarantee for the theoretical research and practical application of boron nitride. [0003] Boron nitride nanotubes (BNNTs) are one of the more important boron nitride materials, which have excellent mechanical, thermal, electromagnetic and other properties. The existing preparation methods of BNNTs mainly include arc discharge method, laser ablation method, vapor phase deposition method (CVD), high temperature synthesis method and so on. Among the...

Claims

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Application Information

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IPC IPC(8): C01B21/064
Inventor 谷云乐范明聪王吉林吉钰纯
Owner WUHAN INSTITUTE OF TECHNOLOGY
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