Multi-stage nanostructure silicon carbide or silicon nitride fiber felt and preparation method thereof
A technology of silicon nitride fiber and structural silicon carbide, which is applied in the direction of heating/cooling fabrics, non-woven fabrics, textiles and papermaking, etc., can solve the problem of lack of three-dimensional network structure, low medium transmission capacity, and low specific surface area of fiber mat structure and other problems, to achieve the effect of simple method and principle, high specific surface area, and wide application prospects
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[0024] The preparation method of the multi-level nanostructure silicon carbide or silicon nitride fiber mat provided by the invention comprises the following steps: performing electrospinning, pre-oxidation and pyrolysis on the spinning solution in order to obtain a multi-level nanostructure silicon carbide fiber mat Or silicon nitride fiber mat; the spinning solution is composed of polystyrene, polycarbosilane, nickel acetylacetonate, xylene and dimethylformamide in a mass ratio of 3:8~20:0.2~2:30~50:50 ~70; the pyrolysis temperature is 1350~1450°C.
[0025] As we all know, reducing the size of the material can further increase the active area and medium transport capacity of the material. If the size of the material is further reduced on the basis of nanofibers, the obtained nanofibers have both self-supporting properties and excellent medium transport capacity and The high specific surface area expands the application range of silicon carbide micro-nano fibers. To obtain s...
Embodiment 1
[0046] (1) Preparation of spinning solution: polystyrene (molecular weight 2,000,000), polycarbosilane (molecular weight 3500), nickel acetylacetonate, xylene and dimethylformamide are added in a mass ratio of 3:8:0.2:30:70 Mix in a reactor, then magnetically stir for 16 hours at a rotating speed of 800 rpm, and stir evenly to obtain a spinning solution;
[0047] (2) Electrospinning: use a metal needle with an inner diameter of 0.8 mm as the nozzle, the spinning voltage is 11 kV, the vertical distance from the needle tip to the receiving screen is 20 cm, the feeding rate is 12 μL / min, the spinning temperature is 20 °C, and the air The relative humidity is 30RH%. Using a drum to collect the filaments, the spinning solution obtained in step (1) is subjected to electrospinning, and the fibril felt is collected;
[0048] (3) Pre-oxidation: Put the fibril mat obtained in step (2) in a programmable temperature-controlled pre-oxidation furnace, and raise the temperature to 200°C at ...
Embodiment 2
[0052] (1) Preparation of spinning solution: Add polystyrene (molecular weight 1,200,000), polycarbosilane (molecular weight 3000), nickel acetylacetonate, xylene and dimethylformamide in a ratio of 3:10:0.5:50:50 Mix in a reactor, then magnetically stir for 10 hours at a rotating speed of 600 rpm, and stir evenly to obtain a spinning solution;
[0053] (2) Electrospinning: a metal needle with an inner diameter of 1.5 mm was used as the nozzle, the spinning voltage was 16 kV, the vertical distance from the needle tip to the receiving screen was 25 cm, the feeding rate was 30 μL / min, the spinning temperature was 35 °C, and the air The relative humidity is 40RH%. Using a drum to collect the filaments, the spinning solution obtained in step (1) is subjected to electrospinning, and the fibril felt is collected;
[0054] (3) Pre-oxidation: put the fibril mat obtained in step (2) in a programmable temperature-controlled pre-oxidation furnace, and raise the temperature to 250° C. at...
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