Method for preparing carbon fiber with boron nitride coating on surface from polyacrylonitrile

A technology of polyacrylonitrile and boron nitride, applied in the direction of fiber treatment, fiber type, fiber chemical characteristics, etc., can solve the problems of high cost, high coating process preparation temperature, complex process, etc., and achieves higher service temperature and higher temperature Antioxidant performance, solve the effect of complex process

Inactive Publication Date: 2018-05-25
SHANDONG UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

This method can overcome the shortcomings of the existing technology, solve the problems of high preparation temperature, complicated proc

Method used

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  • Method for preparing carbon fiber with boron nitride coating on surface from polyacrylonitrile
  • Method for preparing carbon fiber with boron nitride coating on surface from polyacrylonitrile

Examples

Experimental program
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Example Embodiment

[0026] Example 1

[0027] Step 1: Degrease, decontaminate and dry the surface of polyacrylonitrile;

[0028] Step 2: Using absolute ethanol as a solvent, dissolve boric acid and urea at a molar ratio of 2:1 in absolute ethanol, configure the concentration of boric acid to be 0.6 mol / L, stir and disperse it to a uniform solution under ultrasound, then Put the polyacrylonitrile into the solution and soak for 2h;

[0029] Step 3: Put the modified polyacrylonitrile fiber obtained in step 2 in an oven at 80°C for 0.5h, then put the polyacrylonitrile fiber into a pre-oxidation furnace, heat it to 260°C, and preheat it in the air. 2h oxidation;

[0030] Step 4: Put the modified polyacrylonitrile pre-oxidized wire obtained in step 3 into a tube furnace, heat it up to 800°C at a rate of 2°C / min in a nitrogen atmosphere, and then keep it for 4 hours, then heat it at 2°C / min Take out the sample after the speed is cooled to room temperature.

[0031] The samples were analyzed by Auger Electron E...

Example Embodiment

[0032] Example 2

[0033] Step 1: Degrease, decontaminate and dry the surface of polyacrylonitrile;

[0034] Step 2: Using absolute ethanol as a solvent, dissolve boric acid and urea at a molar ratio of 3:1 in absolute ethanol, configure the concentration of boric acid to be 0.7mol / L, stir and disperse it to a uniform solution under ultrasound, then Put the polyacrylonitrile into the solution and soak for 2h;

[0035] Step 3: Put the modified polyacrylonitrile fiber obtained in step 2 in an oven at 80°C for 0.5h, then put the polyacrylonitrile fiber into a pre-oxidation furnace, heat it to 260°C, and preheat it in the air. Oxidation for 2.5h;

[0036] Step 4: Put the modified polyacrylonitrile pre-oxidized wire obtained in step 3 into a tube furnace, heat it up to 800°C at a rate of 2°C / min in a nitrogen atmosphere, and then keep it for 4 hours, then heat it at 2°C / min Take out the sample after the speed is cooled to room temperature.

[0037] The samples were analyzed by Auger Elect...

Example Embodiment

[0038] Example 3

[0039] Step 1: Degrease, decontaminate and dry the surface of polyacrylonitrile;

[0040] Step 2: Using absolute ethanol as a solvent, dissolve boric acid and urea at a molar ratio of 3.5:1 in absolute ethanol, configure the concentration of boric acid to be 0.6mol / L, stir and disperse it to a uniform solution under ultrasound, then Put the polyacrylonitrile into the solution and soak for 2h;

[0041] Step 3: Put the modified polyacrylonitrile fiber obtained in step 2 in an oven at 80°C for 0.5h, then put the polyacrylonitrile precursor fiber into a pre-oxidation furnace, heat it to 270°C, and preheat it in the air. Oxidation for 2.5h;

[0042] Step 4: Put the modified polyacrylonitrile pre-oxidized wire obtained in step 3 into a tube furnace, heat it up to 900°C at a rate of 3°C / min under a nitrogen atmosphere, and then keep it for 5 hours, then heat it at 3°C / min Take out the sample after the speed is cooled to room temperature.

[0043] The samples were analyzed...

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Abstract

The invention discloses a method for preparing carbon fiber with a boron nitride coating on the surface from polyacrylonitrile, and belongs to the field of high-temperature anti-oxidization coating preparation. The method for preparing the carbon fiber with the boron nitride coating on the surface from the polyacrylonitrile comprises the following steps of 1, performing oil removal, decontamination and drying on polyacrylonitrile raw yarns; 2, by using absolute ethyl alcohol as a solvent, preparing a boric acid urea soaking solution from boric acid and urea; 3, putting the polyacrylonitrile obtained in step 1 into the boric acid urea soaking solution obtained in step 2 to be soaked; then, performing drying; 4, putting the polyacrylonitrile obtained in step 3 into a pre-oxidization furnaceto be subjected to pre-oxidization; 5, putting the polyacrylonitrile obtained in step 4 into a high-temperature tubular furnace; raising the temperature in a protection gas atmosphere; performing heatinsulation; lowering the temperature to room temperature; then, taking out a sample. The method provided by the invention can solve the problems that other carbon fiber surface boron nitride coatingpreparation methods need high temperature, the process is complicated, the cost is low and the like. The high-temperature anti-oxidization performance of the carbon fiber is improved; the use temperature is raised.

Description

technical field [0001] The invention relates to the field of preparation of high-temperature anti-oxidation coatings, in particular to a method for preparing carbon fibers coated with boron nitride on the surface by using polyacrylonitrile. Background technique [0002] Carbon fiber is a new type of high-performance fiber material with a carbon content of more than 92%. It has many excellent properties such as light weight, high strength, high modulus, wear resistance, corrosion resistance, fatigue resistance, electrical conductivity, thermal conductivity, and far-infrared radiation. Therefore, carbon fiber has become an irreplaceable pillar material for the national defense civilian industry. At present, oxidation and carbonization of polyacrylonitrile (polyacrylonitrile) fibers have become the mainstream technology for research and production of carbon fibers. However, the high-temperature oxidation resistance of carbon fiber is low, and it will start to oxidize when the ...

Claims

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Application Information

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IPC IPC(8): D01F9/22D06M11/82D06M13/432D06M101/28
CPCD01F9/225D06M11/82D06M13/432D06M2101/28C04B35/62868C04B35/62886C04B2235/5248C04B2235/6562C04B2235/6567
Inventor 王延相付善龙刘群马连茹王瑶瑶瞿策
Owner SHANDONG UNIV
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