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Process for producing ultra-fine boron nitride continuous nano-fibre

A technology of nanofibers and boron nitride, applied in chemical instruments and methods, inorganic chemistry, boron compounds, etc.

Inactive Publication Date: 2009-05-13
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The key reason is that a very suitable and cheap method has not been found so far to prepare boron nitride ultrafine nanofibers.

Method used

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  • Process for producing ultra-fine boron nitride continuous nano-fibre
  • Process for producing ultra-fine boron nitride continuous nano-fibre
  • Process for producing ultra-fine boron nitride continuous nano-fibre

Examples

Experimental program
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Embodiment 1

[0021] A 10% solution of polyacrylonitrile (PAN, Mw=150000) was prepared, and the solvent was dimethylformamide (DMF). After it was completely dissolved, electrospinning was performed. The electrospinning voltage was 20keV, and the aluminum sheet was used for collection. The inner diameter of the needle was 0.45mm, and the distance between the needle and the collection device was 25cm. The PAN fibers collected by electrospinning were placed in the air, heated to 250° C., and kept warm for 2 hours, and the treated PAN fibers were stored for later use. Formulated with 4.8% B 2 o 3 Ethanol solution, and then take 5mL solution impregnated on 500mg PAN template fiber, after drying in the air, place it in a heat-dissolving furnace. Under an ammonia atmosphere (flow rate: 0.1L / min), heat from room temperature to 700°C at a rate of 4K / min, then feed 0.01L / min of oxygen, maintain at 700°C for 2 hours, then turn off the oxygen, continue In an ammonia atmosphere, heat to 1100°C at a h...

Embodiment 2

[0023] The basic preparation process is the same as in Example 1. The difference is: configured B 2 o 3 The concentration of the ethanol solution was 1.2%.

Embodiment 3

[0025] The basic preparation process is the same as in Example 1. The difference is: configured B 2 o 3 The concentration of the ethanol solution was 0.6%.

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Abstract

The invention relates to a method for preparing superfine kubonit continuous nanofiber, which is characterized in that the polymer fiber prepared by adopting the electrical spinning technique is taken as a template agent, then the surface of the template fiber is evenly coated with a boron source precursor by adopting a certain coating technique, and the superfine kubonit continuous nanofiber can be obtained after polymer template agent desorption and azotization treating processes. The appearance of the kubonit fiber product can be controlled through adjusting relative preparation parameters, the diameter of the fiber can be as thin as 50 nm, and no carbon impurity is contained in the kubonit fiber product, so that the purity can be above 98%. The method has the advantages of simple process and cheap raw material and equipment, and the obtained kubonit continuous nanofiber has the advantages of superfine diameter, controllability, high purity and the like, so that the invention has good industrialization prospect.

Description

technical field [0001] The invention relates to a method for preparing ultrafine boron nitride continuous nanofibers. The invention belongs to the technical field of boron nitride continuous nanofiber material preparation. Background technique [0002] Boron nitride fiber has very outstanding physical and chemical properties, mainly in high oxidation resistance temperature (>850 ℃), wide band gap (>5.5eV) and small density (2.27g / cm 3 ). The structure of BN is similar to graphite, and BN fiber has excellent mechanical properties comparable to carbon fiber, so it has important applications similar to carbon fiber in many fields. The high temperature oxidation resistance and chemical stability of BN are much higher than that of carbon fiber, and BN fiber can work in a higher temperature range and in harsh environments, so it has important application value. (R.T. Paine, C.K. Narula. Chemical Review, 1990, 90, 73-91). [0003] From a nanometer point of view, nanomater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B35/08
Inventor 于杰邱业君尹静
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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