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Method for preparing silicon carbide nanofiber

A nanofiber, silicon carbide technology, applied in the chemical characteristics of fibers, textiles and papermaking, etc., can solve the problems of being unsuitable for industrial scale production, low generation efficiency of electrospinning, etc., and achieve high tensile strength, low cost, and a wide range of sources. easy-to-get effect

Inactive Publication Date: 2018-06-22
晋江瑞碧科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although both CN103966701A and CN102603302A can obtain nano-scale silicon carbide fibers by electrospinning, the generation efficiency of electrospinning is low, and it is not suitable for industrial scale production

Method used

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  • Method for preparing silicon carbide nanofiber

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] This embodiment relates to a method for preparing silicon carbide nanofibers, which specifically includes the following steps:

[0028] 1. Dissolve 0.5g polycarbosilane in 9.5g ternary mixed solvent, in which N,N-dimethylformamide: 1,4-dioxane: tetrahydrofuran = 5:1:2 in the ternary solvent, Stir magnetically at room temperature for 3 hours, and prepare a polycarbosilane solution with a mass concentration of 5%.

[0029] 2. Pour the polycarbosilane solution into a petri dish with a diameter of 5 cm, put it in a preset -20°C refrigerator, and quench it for 120 minutes. After quenching, quickly take out the Petri dish, add 200mL ethanol to the Petri dish for extraction, remove the ternary solvent, change ethanol once every 6h, and change ethanol 4 times continuously. Freeze-dried for 24 hours to obtain the first precursor.

[0030] 3. Under the protection condition of helium gas, the first precursor is subjected to radiation cross-linking, and the electron beam intensit...

Embodiment 2

[0036] This embodiment relates to a method for preparing silicon carbide nanofibers, which specifically includes the following steps:

[0037] 1. Dissolve 0.5g polycarbosilane in 9.5g ternary mixed solvent, where N,N-dimethylformamide: 1,4-dioxane: tetrahydrofuran = 5:1:3 in the ternary solvent, Stir magnetically at room temperature for 3 hours, and prepare a polycarbosilane solution with a mass concentration of 5%.

[0038] 2. Pour the polycarbosilane solution into a petri dish with a diameter of 5 cm, put it in a preset -20°C refrigerator, and quench it for 120 minutes. After quenching, quickly take out the petri dish, add 200mL ethanol to the petri dish for extraction, remove the ternary solvent, change ethanol once every 6h, and change ethanol 4 times continuously. Freeze-dried for 24 hours to obtain the first precursor.

[0039] 3. Under the protection condition of helium gas, the first precursor was subjected to radiation cross-linking, and the electron beam intensity ...

Embodiment 3

[0045] This embodiment relates to a method for preparing silicon carbide nanofibers, which specifically includes the following steps:

[0046] 1. Dissolve 1.0g polycarbosilane in 9.0g ternary mixed solvent, where N,N-dimethylformamide: 1,4-dioxane: tetrahydrofuran = 5:2:3 in the ternary solvent, Stir magnetically at room temperature for 3 hours, and prepare a polycarbosilane solution with a mass concentration of 10%.

[0047] 2. Pour the polycarbosilane solution into a petri dish with a diameter of 5 cm, put it into a preset -30°C refrigerator, and quench it for 90 minutes. After quenching, quickly take out the Petri dish, add 200mL ethanol to the Petri dish for extraction, remove the ternary solvent, change ethanol once every 6h, and change ethanol 4 times continuously. Freeze-dry for 24 hours to obtain the first precursor.

[0048] 3. Under the protection condition of helium gas, the first precursor is subjected to radiation crosslinking, the electron beam intensity is 300KG...

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Abstract

The invention relates to a method for preparing a silicon carbide nanofiber. The method comprises the following steps: S1, dissolving polysilane into a ternary mixed solvent of N,N-dimethyl formamide / 1,4-dioxane / tetrahydrofuran so as to obtain a polysilane solution; S2, quenching the polysilane solution for 60-120 minutes at minus 50 DEG C to minus 10 DEG C, performing extraction for four times with ethanol, and performing freezing drying for 24 hours so as to obtain a first precursor; S3, in the presence of helium, performing radiation cross-linking on the first precursor with an electronic beam with a radiation dosage of 200-800KGy, retaining in helium, and performing annealing treatment for one hour at 120 Deg C so as to obtain a second precursor; S4, performing stabilization treatmentand high-temperature sintering on the second precursor, thereby obtaining the silicon carbide nanofiber. According to the method, a polycarbosilane precursor nanofiber is prepared by using a thermallyinduced phase separation method in a ternary solvent, the silicon carbide nanofiber is prepared through radiation cross-linking, stabilization and high-temperature sintering, and the method is simplein process and applicable to large-scale industrial preparation.

Description

technical field [0001] The invention relates to a method for preparing silicon carbide nanofibers, belonging to the technical field of reinforcing materials. Background technique [0002] Silicon carbide has better heat resistance and oxidation resistance than carbon fiber, good chemical stability, and high tensile strength of 2-4GPa. It is mainly used in high temperature resistant and reinforced materials, and is widely used in metal matrix, ceramic matrix and polymer matrix composites. Material reinforcement. At present, silicon carbide fibers are mainly prepared from organosilicon compounds through spinning, carbonization or vapor deposition. [0003] Polycarbosilane (PCS) precursor conversion method is widely used in the preparation of silicon carbide fibers. Firstly, the polycarbosilane spinning solution is prepared, then the precursor fiber is prepared by melt spinning or solution spinning, and then the silicon carbide fiber is obtained through a series of heat treat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/10
CPCD01F9/10
Inventor 胡家朋赵瑨云林皓刘俊劭刘瑞来徐婕付兴平赵升云吴芳芳
Owner 晋江瑞碧科技有限公司
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