Porous ceramics and preparation method thereof

A technology of porous ceramics and ceramic powder, applied in the field of inorganic non-metallic ceramics, can solve the problems of difficulty in meeting requirements, high cost, complicated process, etc., and achieves the effects of satisfying machining and use requirements, high porosity, and good economy.

Inactive Publication Date: 2010-01-06
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current traditional molding preparation methods have been difficult to meet the requirements
For example, the currently used method of adding pore-forming agents has uneven distribution of pores; although the template method can obtain a hexagonal and orderly arranged pore structure, it is difficult to prepare porous ceramics with micron-sized pores, and the process is complicated and the cost is high; while the freeze-drying method prepares The porous ceramics do not have a highly parallel and ordered pore structure; although the porous honeycomb ceramics prepared by extrusion molding have a uniform microstructure and an ordered pore structure, it is difficult to prepare porous ceramics with smaller pore sizes, and the The plasticity requirement of extruded material is higher
These all limit the application field of porous ceramics, which is a key problem that needs to be solved urgently in the development of this material.

Method used

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  • Porous ceramics and preparation method thereof
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  • Porous ceramics and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1: Preparation of porous alumina templates for preparing carbon nanotubes

[0038] 1. Preparation of porous alumina templates for the preparation of carbon nanotubes

[0039] The preparation process is as figure 2 shown.

[0040] Ultrasonic dispersion of 10g of alumina powder in 190g of sodium alginate solution with a concentration of 1.5% (mass percentage content), at this time, the mass ratio of sodium alginate solution to ceramic powder is 190:10=19:1, ball milling 4h, forming 200g of slurry with a solid phase content of 5% (mass percentage), wherein the solid phase content=solid phase powder mass / gross slurry weight, and the total slurry weight=solid phase powder mass+sodium alginate solution mass .

[0041] Then inject the uniformly dispersed slurry into the mold (beaker), and spray the CaCl with a concentration of 2mol / L 2 Aqueous solution, after forming a thin film to cover the slurry surface, fill the remaining curing agent into the mold. Wherein, ...

Embodiment 2

[0057] Embodiment 2: preparation and analysis of hydroxyapatite (HAP) porous ceramics

[0058] 1. Preparation of HAP porous ceramics

[0059] The preparation process is as figure 2 shown.

[0060] Add 10g HAP powder in the sodium alginate solution that 90g concentration is 1.5% (mass percentage), at this moment the mass ratio of sodium alginate solution and HAP powder is 9: 1, ball mills 4h, and the formation solid phase content is 10% ( mass percent) slurry 100g.

[0061] Then inject the slurry into the mold, and evenly spray CaCl with a concentration of 1.5mol / L on the surface of the slurry 2 Aqueous solution, after the curing agent covers the surface of the slurry, fill the remaining curing agent into the mold. Wherein, the total amount of the curing agent used is 25 g, that is, the mass ratio of the curing agent to the slurry is 1:4. After standing for 2 days, the mold was demoulded, and the top and bottom were cut off to obtain a wet base.

[0062] Put the wet bill...

Embodiment 3

[0069] Embodiment 3: Preparation of alumina porous ceramic disk

[0070] 1. Preparation of alumina porous ceramic discs

[0071] The preparation process is as image 3 shown.

[0072] 37.5g (average particle size is 350nm) of alumina powder ultrasonically dispersed in 87.5ml of water to form a 125g suspension, then mixed with 125g of sodium alginate solution with a concentration of 2% (mass percentage), the used sodium alginate solution and The mass ratio of the alumina powder used was 125:37.5=10:3. After ball milling for 4 hours, 250 g of a slurry with good fluidity and a solid phase content of 15% (mass percentage) was formed.

[0073] Add 2.5 g of gelatin (Beijing Chemical Reagent Company) to the above slurry, the gelatin accounts for 1% by mass of the slurry, and heat to 60° C. to fully dissolve.

[0074] The slurry containing gelatin is injected into the mold, and the curing agent is uniformly sprayed on the surface of the slurry after injection molding, and the curin...

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Abstract

The invention discloses a porous ceramics and a preparation method thereof. The preparation method comprises the following steps: (1) preparing a sizing agent with solid content of 2-30 percent by sodium alginate and ceramic powder; (2) injecting the sizing agent obtained in the step (1) into a mold, spraying a firming agent and obtaining a wet greenware A after demoulding; (3) obtaining a wet greenware B after dehydrating the wet greenware A obtained in the step (2) in a sour environment; (4) obtaining a wet greenware C after performing solvent exchange on the wet greenware B obtained in the step (3); and (5) obtaining the porous ceramics after drying and sintering the wet greenware C obtained in the step (4). The sample of the porous ceramics has high and controllable open porosity of 40-80 percent and has higher strength, thereby being capable of satisfying the requirements of machine tooling and use.

Description

technical field [0001] The invention relates to the field of inorganic non-metallic ceramics, in particular to a porous ceramic and a preparation method thereof. Background technique [0002] Porous ceramic is a kind of ceramic material that has been fired at high temperature and has a large number of interconnected or closed pores in the body. It has good chemical stability, corrosion resistance, high temperature resistance, uniform distribution of pores, developed specific surface area, good permeability and characteristics of biocompatibility. Therefore, it is widely used in chemical industry, petroleum, smelting, textile, pharmaceutical, food machinery, cement and other fields. For example, sewage purification, filtration and separation of molten metal and acid-base solution, catalyst carrier, etc. There are many types of this kind of porous ceramic materials, and the requirements are high. For example, for filter materials, the product requires high porosity, narrow p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/00
Inventor 黄勇薛伟江孙阳谢志鹏汪长安杨金龙康振杰崔园园
Owner TSINGHUA UNIV
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