Porous ceramic fiber membrane with layered structure and preparation method thereof
A porous ceramic, layered structure technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of no hierarchy, unstable performance, uncontrollable pore structure, etc. The effect of stable performance and good fracture toughness
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[0022] A method for preparing a porous ceramic fiber membrane with a layered structure, comprising the following steps:
[0023] Configure raw materials, raw materials include water, pure chopped ceramic fiber water-based slurry, sintering aids, adhesives, defoamers and thickeners; make slurry, make the configured raw materials into ceramic fiber slurry; make Fiber film layer, the ceramic fiber slurry is evenly scraped on the ceramic substrate to form a fiber film layer, and the direction of the fiber arrangement is controlled by the squeegee during scrape coating, so that the fiber arrangement direction of each layer tends to be consistent; A good fiber film layer is solidified; repeating the production of fiber film layers and curing to form a ceramic fiber film laminated with multi-layer fiber film layers, wherein the fiber arrangement directions of adjacent fiber film layers are arranged crosswise, and the adjacent fiber film layers form a network Porous structure; sinteri...
Embodiment 1
[0032] Step (1), pretreatment of the ceramic substrate: add 10 parts of water, 12 parts of PVA, and 0.05 parts of polydimethylsiloxane into the container and stir evenly, and add 2 parts of alkaline silica sol in parts by mass Adjust the pH of the solution to 8, and the stirring speed is 300 rpm, add a portion of 1:1 diluted ASE-60, stir evenly, and make a viscous pretreatment slurry; coat the pretreatment slurry evenly On the surface of the ceramic substrate, the thickness is 10-50 microns, and then put the substrate into an oven at 110°C for curing.
[0033] Step (2), adding 75 parts of pure chopped ceramic fiber aqueous slurry containing 20% alumina into the container, stirring for 10 minutes to make the slurry evenly dispersed without precipitation.
[0034] Step (3), in parts by mass, 12 parts of PVA, 0.05 parts of polydimethylsiloxane, and 10 parts of water are added to step (2) uniformly dispersed pure In the chopped ceramic fiber water-based slurry, add 2 parts of a...
Embodiment 2
[0040] Step (1), pretreatment of the ceramic substrate: add 8 parts of water, 16 parts of aluminum sol, and 0.1 part of polydimethylsiloxane into the container and stir evenly, and add 1 part of alkaline silicon Adjust the pH of the solution to 8 with the sol, add 2 parts of 1:1 diluted ASE-60 at a stirring rate of 300 rpm, stir evenly, and make a viscous pretreatment slurry; The pretreatment slurry is evenly coated on the surface of the ceramic substrate with a thickness of 10-50 microns, and then the ceramic substrate is placed in a microwave device for rapid drying.
[0041] Step (2): Add 73 parts of pure chopped ceramic fiber aqueous slurry containing 10% quartz chopped ceramic fiber into the container, stir for 5 minutes to disperse the slurry evenly without precipitation.
[0042] Step (3), according to the number of parts by mass, add 16 parts of aluminum sol, 0.1 part of polydimethylsiloxane, and 8 parts of water to the pure chopped ceramic fiber aqueous solution dispe...
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