Porous ceramic film and preparation method thereof

A technology of ceramic membrane and membrane layer, which is applied in the field of porous ceramic membrane, can solve the problems of temperature change sensitivity, uneven agglomeration and shrinkage, and increase of production cost, and achieve the effects of adjustable pore size, uniform pore channel, and good industrial applicability

Active Publication Date: 2017-05-31
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0003] However, the preparation of porous ceramic membranes faces the following problems: the particle raw materials used in the membrane layer are often irregular in shape, not dense, and the surface energy distribution is uneven, and uneven agglomeration and shrinkage will inevitably occur between the particles during the sintering process. lead to the existence of pore defects; moreover, the high sintering activity of the film layer particles makes it very sensitive to temperature changes, and the effective sintering temperature range of the ceramic film is very narrow, which undoubtedly increases the difficulty of regulating the pore structure; in addition, in the sintering process In general, since the transition layer particles and film layer particles require different sintering temperatures, it is often necessary to sinter the transition layer first, and then sinter the film layer. The two-step sintering not only increases the production cycle, but also increases the production cost.

Method used

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preparation example Construction

[0032] The preparation process of the present invention will be further described below in conjunction with the accompanying drawings.

[0033] The flow chart of the preparation of porous ceramic membrane with uniform pore size is attached. figure 1 Shown:

[0034] (1) Preparation of slurry: the transition layer particles and the film layer particles are respectively dispersed in the PVA solution with a concentration of 2-8wt.%, and the transition layer slurry with a solid content of 10-50wt.% and 5-25wt.% is obtained material and film layer slurry;

[0035] (2) Preparation of the transition layer: using the transition layer slurry, the transition layer is deposited on the surface of the porous support by the dipping-pulling method, and dried at 40° C. to obtain the transition layer;

[0036] (3) Prepare the film layer: use the film layer slurry to deposit a film layer on the surface of the transition layer obtained in step (2) by dipping-pulling method, wherein the dipping ...

Embodiment 1

[0039] A certain amount of transition layer Al was added to the PVA solution with a concentration of 2wt.%. 2 o 3 Particles and layers of spherical nano-Al 2 o 3Granules, two sets of slurries with solid content of 10wt.% and 5wt.% were obtained. Prepare a transition layer on the surface of the porous support and dry it at 40°C; prepare a film layer on the surface of the transition layer by dipping and pulling, wherein the dipping time is 1min, the pulling rate is 1cm / min, and then the initial drying temperature is 30 °C for 10 hours, and finally dried thoroughly at 110 °C to obtain a ceramic membrane green body. The ceramic membrane green body was sintered at 1200°C for 0.5h to obtain a ceramic membrane with a multi-layer structure, wherein the temperature was raised at a rate of 0.5°C / min before 500°C. The obtained ceramic membrane had a porosity of 55%, an average pore diameter of 50 nm, and a membrane thickness of 5 μm.

Embodiment 2

[0041] A certain amount of transition layer Al was added to the PVA solution with a concentration of 4wt.%. 2 o 3 Particles and layers of spherical nano-TiO 2 Granules, two sets of slurries with solid contents of 20wt.% and 10wt.% were obtained. Prepare a transition layer on the surface of the porous support and dry it at 40°C; prepare a film layer on the surface of the transition layer by dipping and pulling, wherein the dipping time is 1min, the pulling rate is 1cm / min, and then the initial drying temperature is 30 °C for 10 hours, and finally dried thoroughly at 110 °C to obtain a ceramic membrane green body. The ceramic membrane green body was sintered at 1200°C for 0.5h to obtain a ceramic membrane with a multi-layer structure, wherein the temperature was raised at a rate of 0.5°C / min before 500°C. The obtained ceramic membrane had a porosity of 55%, an average pore diameter of 50 nm, and a membrane thickness of 5 μm.

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Abstract

The invention discloses a porous ceramic film and a preparation method thereof and belongs to the technical field of porous ceramic films. The porous ceramic film is of a multistage structure and comprises a film layer, a transition layer and a porous supporting body; the film layer is prepared by sintering low-activity nanometer particles with dense sphere and a middle transition phase; the transition layer is prepared by sintering conventional irregular micro-powder; and the film layer and the transition layer are sintered by one time under the same condition. The preparation method comprises the following steps: enabling the transition layer particles and the film layer particles to disperse in a polyvinyl alcohol (PVA) aqueous solution to obtain transition layer slurry and film layer slurry; depositing the transition layer on the surface of the porous supporting body by using a dipping-pulling method, and drying; preparing the film layer on the surface of the transition layer by using the dipping-pulling method, and drying to obtain a ceramic film green body; and finally, obtaining the porous ceramic film through one-step sintering. The porous ceramic film has very good effect on treating suspended matters and can be used in the fields of printing and dyeing material recovery, beverage clarification, powder preparation, oil-water separation and the like.

Description

technical field [0001] The invention belongs to the field of porous ceramic membranes, and relates to one-step sintering for preparing a membrane layer with a uniform pore structure and a multi-gradient membrane structure. Background technique [0002] Porous ceramic membrane is a very important material. The material is generally composed of a porous support layer, a transition layer and a membrane layer. The separation and purification of the mixture can be achieved by using the interception effect of the pore structure of the membrane layer. Ceramic membranes have the advantages of high temperature resistance, corrosion resistance, wear resistance, high pressure bearing, and high classification accuracy. . [0003] However, the preparation of porous ceramic membranes faces the following problems: the particle raw materials used in the membrane layer are often irregular in shape, not dense, and the surface energy distribution is uneven, and uneven agglomeration and shrink...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/46C04B35/48C04B35/622C04B38/00B01D67/00B01D69/12B01D71/02
CPCB01D67/0041B01D69/12B01D71/025C04B35/10C04B35/46C04B35/48C04B35/62218C04B38/00
Inventor 袁方利孙志强
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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