CN110407574B - Calcium zirconate-calcium hexaluminate composite porous ceramic and preparation method thereof - Google Patents
Calcium zirconate-calcium hexaluminate composite porous ceramic and preparation method thereof Download PDFInfo
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Abstract
A calcium zirconate-calcium hexaluminate composite porous ceramic is prepared from calcium zirconate, calcium hexaluminate, zirconia, alumina, pure calcium aluminate cement, rapeseed oil, water, cellulose and polyethylene; the adhesive is characterized by comprising the following components in parts by weight: 60-90 parts of calcium hexaluminate, 5-20 parts of calcium zirconate, 5-20 parts of pure calcium aluminate cement, 50-75 parts of zirconia, 1-3 parts of alumina, 2-5 parts of polyethylene, 10-45 parts of water, 1-3 parts of rapeseed oil and 1-3 parts of cellulose; step-by-step preparation: firstly, preparing calcium zirconate; the second step is the preparation of calcium hexaluminate; thirdly, preparing the prepared calcium zirconate and calcium hexaluminate into calcium zirconate-calcium hexaluminate composite porous ceramic; the invention has the advantages that the invention not only has all the advantages of common porous ceramics, but also has special performance exceeding common materials; light weight, high open porosity, good strength, strong adsorption capacity, especially good chemical stability and strong erosion resistance; is not reached by common materials; the catalyst is suitable to be used as a catalyst carrier for chemistry, synthesis and catalysis in the industries of steel, petrifaction and the like.
Description
Technical Field
The invention belongs to the technical field of composite porous ceramics, and particularly relates to calcium zirconate and calcium hexaluminate composite porous ceramics and a preparation method thereof.
Background
The porous ceramic is a novel ceramic material with wide application, and has a uniformly distributed micropore or pore structure and a three-dimensional network structure, so that the porous ceramic has high porosity, small volume density, selective permeability to liquid and gas media, high temperature resistance, corrosion resistance and good chemical stability. The method is widely applied to the aspects of gas and liquid filtration, purification, separation, chemical catalytic carriers, sound absorption and shock absorption and the like.
At present, the produced common porous ceramics have various categories, and generally have the technical defects of poor strength, poor chemical stability, poor erosion resistance, high production cost, short service life, narrow range and the like. Among them, there are ordinary calcium zirconate porous ceramics and calcium hexaluminate porous ceramics, and although the calcium zirconate porous ceramics have high strength, the aperture ratio is not high; the calcium hexaluminate porous ceramic has large porosity, but low strength and is easy to break.
Disclosure of Invention
The invention aims to overcome the defects of common porous ceramics and develop a composite porous ceramic material with light weight, high strength, good three-dimensional porous structure, large adhesive force, good chemical stability and strong erosion resistance. Aims to provide a ceramic material which is more energy-saving and environment-friendly, has simple process, excellent performance, good economic benefit and social benefit, novel and advanced process and wider application; the calcium zirconate and calcium hexaluminate composite porous ceramic material prepared by the method really realizes strong combination, promotes new materials and realizes the maximum advantage complementation.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: the calcium zirconate-calcium hexaluminate composite material is prepared from calcium zirconate, calcium hexaluminate, zirconia, pure calcium aluminate cement, alumina, calcium carbonate, rapeseed oil, water, cellulose and polyethylene, and is characterized by comprising the following components in parts by weight: 50-90 parts of calcium hexaluminate, 2-25 parts of calcium zirconate, 8-30 parts of pure calcium aluminate cement, 50-75 parts of zirconia, 1-3 parts of alumina, 5-30 parts of calcium carbonate, 2-5 parts of polyethylene, 10-45 parts of water, 1-3 parts of rapeseed oil and 1-3 parts of cellulose.
The preparation method comprises the following steps: the first step is as follows: preparation of calcium zirconate: calcium carbonate 5-30 and zirconia 50-75 are used as raw materials according to the weight components, alumina 1-3 is added as a stabilizing agent, calcium zirconate CaZrO is synthesized at the high temperature of 1450-1650 DEG C3Processing into 325 mesh micropowder within 8 h; the second step is that: preparation of calcium hexaluminate: calcining 30-90 parts by weight of alumina and 5-30 parts by weight of calcium carbonate at 1450-1600 ℃, and preserving heat for 6 hours to prepare calcium hexaluminate CaO.6AI2O3(ii) a The third step: calcium zirconate and calcium hexaluminate composite porous ceramic and a preparation method thereof. One method comprises the following steps: mixing 5-25 parts by weight of calcium zirconate and 50-90 parts by weight of calcium hexaluminate, 8-30 parts by weight of pure calcium aluminate cement, 1-3 parts by weight of rapeseed oil, 10-15 parts by weight of water and 1-3 parts by weight of cellulose in a kneader, kneading the mixture into a plastic raw material, carrying out extrusion forming and drying, and firing the blank at 1350-1550 ℃ to obtain the composite porous ceramic. The second method comprises the following steps: the calcium zirconate and the calcium hexaluminate prepared in the first step and the second step are prepared from the following components in parts by weight: 2-25 parts of calcium zirconate, 50-90 parts of calcium hexaluminate, 8-30 parts of pure calcium aluminate cement, 2-5 parts of polyethylene and 25-45 parts of water are prepared into slurry, and the slurry is subjected to spray granulation and dry pressing forming, and a blank is sintered into the composite porous ceramic at 1350-1550 ℃.
The invention has the advantages that: the calcium zirconate and the calcium hexaluminate are sintered by a kiln at 1350-1550 ℃ to chelate the crystal phases of the calcium zirconate and the calcium hexaluminate. Thereby not only having all the conditions of the porous ceramics, but also having special properties beyond the common materials. Light weight, high open porosity, good strength, strong adsorption capacity, especially good chemical stability and strong erosion resistance; the catalyst is not available in common materials, and is suitable to be used as a catalyst carrier for chemistry, synthesis and catalysis in industries such as steel, petrifaction and the like.
The product of the invention has the shape determined by market demand, and can be made into sphere, column, tube or plate.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
The purpose of the invention is realized by the following embodiment:
the first step is as follows: preparation of calcium zirconate: the components by weight percentage are as follows: calcium carbonate 5-30 and zirconia 50-70 as raw materials, adding alumina 1-3 Wt% as stabilizer, and synthesizing calcium zirconate CaZrO at 1450-1650 deg.C3Processing into 325 mesh micropowder within 8 h;
the second step is that: the preparation of the calcium hexaluminate comprises the following components in parts by weight: calcining alumina 30-90 and calcium carbonate 5-30 at 1450-1600 deg.C, and maintaining for 6 hr to obtain CaO.6AI2O3；
The third step: calcium zirconate and calcium hexaluminate composite porous ceramic and a preparation method thereof.
Example one: the calcium zirconate and the calcium hexaluminate prepared in the first step and the second step are prepared from the following components in parts by weight: 2-25 parts of calcium zirconate and 50-90 parts of calcium hexaluminate, 8-30 parts of pure calcium aluminate cement, 1-3 parts of rapeseed oil, 10-15 parts of water and 1-3 parts of cellulose are evenly mixed and kneaded in a kneader to form plastic raw materials, extruded and molded, dried and sintered into composite porous ceramics at 1350-1550 ℃.
Example two: the calcium zirconate and the calcium hexaluminate prepared in the first step and the second step are prepared from the following components in parts by weight: 2-25 parts of calcium zirconate, 50-90 parts of calcium hexaluminate, 8-30 parts of pure calcium aluminate cement, 2-5 parts of polyethylene and 25-45 parts of water are prepared into slurry, and the slurry is subjected to spray granulation and dry pressing forming, and a blank is sintered into the composite porous ceramic at 1350-1550 ℃.
The composite porous ceramic of the invention overturns the traditional mode, and the product has the advantages of high strength, stable chemical property, good thermal shock resistance, strong chemical corrosion resistance, low volume density, less impurities and wide application industry, and is a novel special new material.
Claims (1)
1. A preparation method of calcium zirconate-calcium hexaluminate composite porous ceramic is characterized by comprising the following steps: the first step, the preparation of calcium zirconate: calcium carbonate 5-30 and zirconia 50-75 are used as raw materials according to the weight components, alumina 1-3 is added as a stabilizing agent, calcium zirconate CaZrO is synthesized at the high temperature of 1450-1650 DEG C3Processing into 325 mesh micropowder within 8 h; step two, preparing calcium hexaluminate: calcining 30-90 parts by weight of alumina and 5-30 parts by weight of calcium carbonate at 1450-1600 ℃, and preserving heat for 6 hours to prepare calcium hexaluminate CaO.6Al2O3(ii) a The third step, the preparation method of the calcium zirconate-calcium hexaluminate composite porous ceramic comprises the following steps: mixing 5-25 parts by weight of calcium zirconate and 50-90 parts by weight of calcium hexaluminate, 8-30 parts by weight of pure calcium aluminate cement, 1-3 parts by weight of rapeseed oil, 10-15 parts by weight of water and 1-3 parts by weight of cellulose in a kneader, kneading the mixture into a plastic raw material, carrying out extrusion forming and drying, and firing the blank at 1350-1550 ℃ to obtain composite porous ceramic; or the calcium zirconate and the calcium hexaluminate prepared in the first step and the second step are prepared according to the following weight components: 2-25 parts of calcium zirconate, 50-90 parts of calcium hexaluminate, 8-30 parts of pure calcium aluminate cement, 2-5 parts of polyethylene and 25-45 parts of water are prepared into slurry, and the slurry is subjected to spray granulation and dry pressing forming, and a blank is sintered into the composite porous ceramic at 1350-1550 ℃.
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| CN111892409B (en) * | 2020-07-15 | 2022-03-15 | 武汉科技大学 | Calcium hexaluminate hollow whisker reinforced aluminum-calcium complex phase refractory material and preparation method thereof |
| CN112794710A (en) * | 2021-01-12 | 2021-05-14 | 北京科技大学 | Zr4+Ion-doped CA6Base refractory material and preparation method thereof |
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| CN103819219A (en) * | 2014-01-22 | 2014-05-28 | 湖南大学 | Acid and alkali corrosion-resistant silicon carbide porous support |
| CN105272315A (en) * | 2015-11-16 | 2016-01-27 | 武汉科技大学 | Porous calcium zirconium aluminate and preparation method thereof |
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| JP3366938B2 (en) * | 1999-10-27 | 2003-01-14 | 独立行政法人産業技術総合研究所 | Calcium zirconate / magnesia composite porous body and method for producing the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103819219A (en) * | 2014-01-22 | 2014-05-28 | 湖南大学 | Acid and alkali corrosion-resistant silicon carbide porous support |
| CN105272315A (en) * | 2015-11-16 | 2016-01-27 | 武汉科技大学 | Porous calcium zirconium aluminate and preparation method thereof |
Non-Patent Citations (2)
| Title |
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| 反应烧结法制备六铝酸钙多孔材料;李天清等;《耐火材料》;20041231;第38卷(第5期);结论部分 * |
| 氧化铝对锆酸钙材料组成和结构的影响;游杰刚 等;《材料热处理学报》;20140531;第35卷(第5期);结论部分 * |
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