Nano-aperture porous periclase-magnesium aluminum spinel ceramic material and preparation method thereof

Abstract

The invention relates to a nano-aperture porous periclase-magnesium aluminate spinel ceramic material and a preparation method thereof. The preparation method comprises the steps of sequentially heating magnesite fine powder to 680 to 850 DEG C and 950 to 1250 DEG C, keeping warm, and obtaining magnesium oxide powder with high porosity; putting 70 to 98 weight percent of magnesium oxide powder with high porosity into a vacuum mixer, adding 0.1 to 25 weight percent of solution containing Al<3+> and 0.1 to 10 weight percent of aluminium hydroxide micro powder under 2.0kPa, and stirring to obtain a mixture; keeping warm of the mixture at 110 to 220 DEG C, cooling, mechanical pressing, and drying; then keeping warm at 950 to 1250 DEG C and 1480 to 1620 DEG C respectively, and obtaining the nano-aperture porous periclase-magnesium aluminate spinel ceramic material. The preparation method provided by the invention is low in preparation cost and environmentally-friendly, and the prepared product has a nanoscale pore size, and has the advantages of low air permeability, small volume density, low heat conduction coefficient, and high strength.

Description

technical field [0001] The invention belongs to the technical field of porous periclase-magnesia aluminum spinel ceramic materials. In particular, it relates to a nano-aperture porous periclase-magnesia-aluminum spinel ceramic material and a preparation method thereof. Background technique [0002] Periclase-magnesia-aluminum spinel materials are widely used in high-temperature kiln inner villages due to their excellent high-temperature properties such as chemical stability and thermal shock stability. heat loss. With the increasing shortage of energy and resources, people pay more and more attention to the research on periclase-magnesium aluminum spinel ceramics with low thermal conductivity. The development of porous periclase-magnesia aluminum spinel ceramic materials is the solution to this effective approach to the problem. [0003] At present, there are many preparation methods for porous periclase-magnesium-aluminum spinel ceramics, including adding pore-forming ag...

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Problems solved by technology

[0003] At present, there are many preparation methods for porous periclase-magnesium-aluminum spinel ceramics, including adding pore-forming agent method, molten salt method and in-situ decomposition synthesis method, etc., such as the patented technology "a reaction synthesis of porous magnesium-aluminum spinel Stone preparation method (CN102795884A) ", with aluminum powder and magnesia as raw material, utilize polymer oxidation combustion method to oxidize and synthesize porous magnesia-aluminum spinel ceramics in air, but the obtained magnesia-alumina spinel ceramics have larger pore diameters, High air permeability, low strength, and high molecular oxidation combustion will produce a large amount of CO 2 , forming secondary pollution; another example is literature technology (Chen Hao. Preparation of magnesium oxide and magnesium-containing spinel powder by molten salt method. Doctoral dissertation, Wuhan University of Science and Technology, 2010) with MgCl 2 , CaCO 3 , α-Al 2 o 3 , NaCl, and KCl as raw materials, the porous magnesium-aluminum spinel material was prepared by the molten salt method. + 、K + , Cl - and other impurities; another example is the patented technology "preparation of lightweight periclase-magnesia-aluminum spinel composite material in situ decomposition (CN103553672A)", which uses magnesium-aluminum hydrotalcite as raw material to prepare porous periclase-spinel Crystal stone ceramic material, but the pore diameter of the material is larger, the air permeability is higher, and the high temperature performance is poor