Preparation method of silicon carbide ceramic hollow fiber membrane reinforced and toughened by silicon carbide whiskers

A technology of silicon carbide whiskers and silicon carbide ceramics, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of low ceramic hollow fiber membrane strength, low effective filtration area, and difficult packaging, etc., to achieve The effect of shortening the permeation path, reducing the permeation resistance of the membrane, and increasing the packing density

Inactive Publication Date: 2018-10-23
WUHAN INSTITUTE OF TECHNOLOGY
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of low effective filtration area of ​​existing ceramic tubular membranes or flat membranes, low strength of ceramic hollow fiber membranes, and difficult packaging, etc., and provide a silicon carbide hollow fiber membrane reinforced and toughened by silicon carbide whiskers And its preparation method and application

Method used

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  • Preparation method of silicon carbide ceramic hollow fiber membrane reinforced and toughened by silicon carbide whiskers
  • Preparation method of silicon carbide ceramic hollow fiber membrane reinforced and toughened by silicon carbide whiskers
  • Preparation method of silicon carbide ceramic hollow fiber membrane reinforced and toughened by silicon carbide whiskers

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preparation example Construction

[0029] A method for preparing a silicon carbide ceramic hollow fiber membrane reinforced and toughened by silicon carbide whiskers, comprising the following steps:

[0030] (1) Polyethersulfone (5%-10%, mass fraction), N-methyl-pyrrolidone (35%-40%), silicon carbide powder (30%-60%) and silicon carbide whiskers (supplement 100%) mixing, ball milling for 2-10 hours to make it evenly mixed, and then continuously stirring to fully disperse the solid particles in the polymer solution to obtain a uniformly dispersed spinning solution, that is, the cast film slurry;

[0031] (2) Add the cast film slurry to the spinning device, vacuumize for 0.5-2h to remove the residual air bubbles, then pass the inner gelling agent into the spinning device, apply 0.1-0.6bar nitrogen pressure to cast The film slurry is squeezed into the spinneret, and the fiber wet film extruded from the spinneret is immersed in an external coagulation bath through a 0-20cm dry spinning process for 12-36h of gelatio...

Embodiment 1

[0036] 0% SiC whisker reinforced and toughened SiC ceramic hollow fiber membrane

[0037] (1) Mix polyethersulfone (10%, referring to its mass percentage in the casting film slurry, the same below), N-methyl-pyrrolidone (40%), mix them by wet ball milling for 6 hours, and dissolve them completely Polymer solution, adding silicon carbide powder (50%) with an average particle size of 1 μm to the above polymer solution, stirring continuously to fully disperse the solid particles in the polymer solution, and obtain a uniformly dispersed spinning solution, that is, casting slurry material.

[0038] (2) Add the prepared cast film slurry into the slurry tank on the spinning device, first vacuumize for 2 hours to remove the residual air bubbles, then pass through the inner gelling agent water, and finally apply a nitrogen pressure of 0.1 bar, from the spinneret The extruded fiber wet membrane is immersed in the water of an external coagulation bath through a 10 cm dry spinning proces...

Embodiment 2

[0041] 5% SiC Whisker Reinforced and Toughened SiC Ceramic Hollow Fiber Membranes

[0042] (1) After mixing polyethersulfone (10%) and N-methyl-pyrrolidone (40%), wet ball milling and mixing for 6 hours to completely dissolve it to form a polymer solution, and add the average particle size to the above polymer solution Silicon carbide powder (45%) of 5 μm and silicon carbide whiskers (5%) with an average length of 10 μm and an average diameter of 1 μm, continuous stirring to fully disperse the solid particles in the polymer solution, and obtain a uniformly dispersed spinning solution That is, casting film slurry.

[0043] (2) Add the prepared cast film slurry into the slurry tank on the spinning device, first vacuumize for 2 hours to remove residual air bubbles, then pass through the inner gelling agent ethanol, and finally apply a nitrogen pressure of 0.1bar, from the spinneret The extruded fiber wet membrane is dipped in ethanol in an external coagulation bath through a 10 ...

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Abstract

The invention relates to a preparation method of a silicon carbide ceramic hollow fiber membrane reinforced and toughened by silicon carbide whiskers. The method includes steps of: mixing and ball-milling polyether sulfone, N-methylpyrrolidone, silicon carbide whiskers and silicon carbide powder according to certain ratio to form membrane casting slurry; performing extrusive spinning to obtain a green body; and finally performing phase-change/high-temperature sintering process to obtain the finish product of the silicon carbide ceramic hollow fiber membrane reinforced and toughened by siliconcarbide whiskers. Due to cooperative effect of two reinforcing and toughening mechanisms of pulling-out bridging and crack turning of the silicon carbide whiskers, the hollow fiber membrane has a self-supporting non-symmetrical structure, is high in strength and loading density, is high in permeation throughput, has good thermal shock resistance and can be widely applied to the field of high-temperature gas-solid separation.

Description

technical field [0001] The invention relates to the technical field of hollow fiber ceramic membranes, in particular to a silicon carbide ceramic hollow fiber membrane reinforced and toughened by silicon carbide whiskers and a preparation method thereof. Background technique [0002] my country's electric power, coal chemical industry, and cement industries will inevitably emit a large amount of high-temperature flue gas. The resulting air pollution has become an environmental problem that needs to be solved urgently. Improving the cleanliness of the flue gas emission is a measure that is conducive to environmental protection. important measure. With the emergence of high-performance gas-solid separation ceramic membranes, a feasible new technical route is provided to solve this problem. To remove dust particles in high-temperature flue gas, the selected gas-solid separation ceramic membrane must be able to withstand high temperature (500-900°C), high pressure (1.0-3.0MPa) a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02B01D67/00B01D69/02B01D69/08
CPCB01D67/0067B01D69/02B01D69/08B01D71/02B01D71/024
Inventor 徐慢朱丽沈凡王树林许晨希许政威田诗瑶曹宏陈常连季家友石和彬戴武斌薛俊
Owner WUHAN INSTITUTE OF TECHNOLOGY
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