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Method for preparing boron nitride continuous nano fibre

A nanofiber and boron nitride technology, applied in chemical instruments and methods, nitrogen compounds, inorganic chemistry, etc., can solve problems such as unfavorable industrial production, difficult carbon removal, and no nano boron nitride fiber

Inactive Publication Date: 2008-09-03
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there is no report on nano boron nitride fiber
In addition, the use of organic polymer precursors to prepare boron nitride fibers is easy to introduce carbon impurities, and it is difficult to completely remove carbon even at very high temperatures
At the same time, the process of preparing boron nitride fibers using organic raw materials is relatively long, and the entire process is basically carried out in an inert atmosphere, which is not conducive to industrial production

Method used

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  • Method for preparing boron nitride continuous nano fibre
  • Method for preparing boron nitride continuous nano fibre
  • Method for preparing boron nitride continuous nano fibre

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A 4% boric acid solution was prepared, and the solvent was absolute ethanol. Add polyvinylpyrrolidone (PVP, Mw=42000) to make its mass percentage 35%. At 55°C, stir for 24h. The solution was poured into a 5mL syringe for spinning. The spinning conditions were: voltage 25KV, distance between the receiving device and the spinneret 28cm, and solution advancing speed 3.5mL / h. The prepared primary fiber was heated from room temperature to 650°C at a rate of 4K / min under a nitrogen atmosphere (flow rate of 0.1L / min), and then passed through 0.01L / min of air and maintained at 700°C for 4h. Then cool to room temperature naturally. Take out the sample and place it in a high-temperature furnace. Under a nitrogen atmosphere, heat it from room temperature to 1000°C at a heating rate of 3K / min and maintain it for 20h, then heat it to 1700°C at a heating rate of 1K / min and maintain it for 10h, then cool naturally to room temperature to obtain a BN fiber product.

Embodiment 2

[0029] The basic preparation process is the same as in Example 1. The difference is: the content of PVP is 15%.

Embodiment 3

[0031] The basic preparation process is the same as in Example 2. The difference is: the electrospinning voltage is 40KV.

[0032] The infrared spectrogram of embodiment 3 gained sample is as Figure 5 , it can be seen that the main component of the sample is hexagonal boron nitride.

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Abstract

The invention relates to a method for preparing boron nitride continuous nanofiber. The method is characterized in that solution electrostatic spinning technique is adopted to prepare the primary fiber; and polymer removal and nitrizing treatment are carried out to obtain the nitride continuous nanofiber. By adjusting the electrostatic spinning process parameter and the mixture ratio of raw materials, the morphology of boron nitride can be well controlled, and the fiber diameter is lower than 100nm. The boron nitride product contains no carbon impurity, and the purity thereof reaches more than 98%. The method has the advantage of simple process, low material and device cost, high quality of the obtained product and good industrialization prospect.

Description

technical field [0001] The invention relates to a method for preparing boron nitride continuous nanofibers. The invention belongs to the technical field of boron nitride continuous nanofiber material preparation. Background technique [0002] Boron nitride has many unique properties, it has a wide range of resistance to electromagnetic radiation, low density, high temperature oxidation resistance, high heat of vaporization and excellent lubricating properties. Boron nitride fiber combines the unique advantages of boron nitride materials and fiber materials. BN fibers are expected to have a high Young's modulus and at the same time high strength. BN fibers can remain stable at high temperatures of 2500°C under inert conditions. Moreover, it can still maintain excellent insulation and dielectric properties in high temperature and harsh environments. At the same time, BN fiber exhibits good stability at 850°C in an oxidizing atmosphere, and its oxidation resistance is much ...

Claims

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Application Information

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IPC IPC(8): C01B21/064
Inventor 于杰邱业君尹静
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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