Method for manufacturing light magnesia-alumina spinel insulation materials

A technology of aluminum spinel and thermal insulation material, which is applied in ceramic products, applications, household appliances, etc., to avoid sintering and cracking, use less equipment, and simplify the process.

Active Publication Date: 2012-09-12
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical solution adopted by the present invention to realize the purpose of the invention is: a method for preparing light magnesia-aluminum spinel heat-insulating material, using alumina powder and magnesite powder or magnesium oxide powder as main raw materials, adding water, Foaming agent, organic monomer, cross-linking agent to prepare foam slurry; using the characteristics of rapid solidification molding by gel injection molding, by adding magnesite powder or magnesium oxide, alumina powder, organic monomer, cross-linking agent, Initiator and catalyst are sequentially added to the foam slurry prepared by water and foaming agent, so that the monomer and the crosslinking agent undergo a polymerization reaction, the bubbles in the foam slurry are fixed, the foam slurry is rapidly solidified and formed, and a light green body is prepared. At the same time, the volume expansion caused by the spinelization of alumina and magnesia in the sintering stage is used to solve the problem of cracking caused by uneven sintering shrinkage, and finally obtain a lightweight magnesia-aluminum spinel thermal insulation material through sintering

Method used

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  • Method for manufacturing light magnesia-alumina spinel insulation materials
  • Method for manufacturing light magnesia-alumina spinel insulation materials
  • Method for manufacturing light magnesia-alumina spinel insulation materials

Examples

Experimental program
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Effect test

Embodiment 1

[0027] magnesite powder of 50nm, alumina powder of 100μm, water accounting for 70% of the total mass of the powder, sodium lauryl sulfate accounting for 1% of the total mass of the powder, acrylamide accounting for 20% of the total mass of the powder and N,N'-methylenebisacrylamide accounting for 5% of the mass of acrylamide was poured into the mixing drum in sequence, and stirred to obtain a foam slurry, wherein the mass ratio of magnesite powder to alumina powder was 1. Next, add ammonium persulfate accounting for 10% of the mass of acrylamide and N,N,N',N'-tetramethylethylenediamine accounting for 10% of the mass of ammonium persulfate into the foam slurry, stir well, and pour quickly To the mold, the foam slurry is solidified and formed to obtain a green body; finally, the green body is dried in an oven at 100°C, placed in a furnace, heated to 1500°C, and sintered to obtain a lightweight magnesium-aluminum spinel thermal insulation material. macro photo as figure 1 As sho...

Embodiment 2

[0031] 100 μm magnesite powder, 50nm alumina powder, water accounting for 10% of the total mass of the powder, sodium dodecylbenzenesulfonate accounting for 10% of the total mass of the powder, and formazan accounting for 1% of the total mass of the powder methacrylamide and N,N'-methylenebisacrylamide, which accounts for 20% by weight of methacrylamide, are poured into the mixing drum in turn, and stirred to obtain a foam slurry, wherein the mass ratio of magnesite powder to alumina powder is 0.6 . Add ammonium persulfate accounting for 2% of the mass of methacrylamide and N,N,N',N'-tetramethylethylenediamine accounting for 40% of the mass of ammonium persulfate into the foam slurry, stir evenly, and quickly The foam slurry is poured into a mold of a specific shape, and the foam slurry is solidified and formed to obtain a green body; the green body is dried in an oven at 100°C, placed in a furnace, and heated to 1600°C, and sintered to obtain a lightweight magnesium-aluminum ...

Embodiment 3

[0033] Mix magnesite powder of 10 μm, alumina powder of 30 μm, water accounting for 10% of the total mass of the powder, ammonium lauryl sulfate accounting for 10% of the total mass of the powder, vinylpyrrole accounting for 1% of the total mass of the powder Ketone and N,N'-methylene bisacrylamide accounting for 20% by weight of vinylpyrrole ketone were poured into the mixing drum in turn, and stirred to obtain a foam slurry, wherein the mass ratio of magnesite powder to alumina powder was 0.8. Add ammonium persulfate accounting for 2% of the mass of methacrylamide and N,N,N',N'-tetramethylethylenediamine accounting for 40% of the mass of ammonium persulfate into the foam slurry, stir evenly, and quickly The foam slurry is poured into a mold of a specific shape, and the foam slurry is solidified and formed to obtain a green body; the green body is dried in an oven at 100°C, placed in a furnace, heated to 1700°C, and sintered to obtain a lightweight magnesium-aluminum spinel th...

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Abstract

The invention belongs to the technical field of insulation material manufacturing, in particular to a method for manufacturing light magnesia-alumina spinel insulation materials. The method includes the following steps: pouring magnesite powder or magnesia powder, alumina powder, water, foaming agents, monomers and cross linking agents successively into a stirring cylinder, and obtaining a foam slurry through mechanical stirring; adding initiating agents and catalytic agents into the foam slurry successively, and pouring the mixture into a mold rapidly; demoulding to obtain green bodies after slurry gel is solidified, and obtaining light magnesia-alumina spinel insulation materials though drying and sintering. The method has the advantages that magnesite or magnesia powder prepared by calcining magnesite which is abundant in our country is used as main materials, cracking problems caused by uneven sintering shrinkage are solved through cubical expansion during spinel petrifaction process, magnesia-alumina spinel insulation products with fixed forms, different shapes and sizes, low density and thermal conductivity and high strength are manufactured, the process is simple, the cost of used materials is low, and insulation materials are suitable for industrialized manufacture.

Description

technical field [0001] The invention belongs to the technical field of heat insulation material preparation, and in particular relates to a method for preparing light magnesium aluminum spinel heat insulation material. Background technique [0002] Magnesium aluminum spinel (MgA1 2 o 4 ) has the characteristics of high melting point (2135°C), strong high temperature stability, low thermal conductivity, and good thermal shock resistance. Magnesium aluminum spinel materials are usually made of MgO and Al 2 o 3 Artificially synthesized, it has been widely used in the refractory industry. However, it is mainly used for dense refractory products, and there is no report on lightweight spinel insulation materials. It is prepared into a lightweight magnesium-aluminum spinel material with a porous structure, which can be used as a heat-insulating material above 1600 ° C, which plays a role in energy saving, and at the same time can give full play to the advantages of my country's...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/443C04B38/10C04B35/622
Inventor 王刚吴海波李红霞袁波韩建燊曹贺辉
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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