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Alumina fiber magnesium aluminate spinel porous ceramic and preparation method thereof

A technology of alumina fiber and magnesium aluminum spinel, applied in the field of porous ceramics, can solve the problems of cumbersome preparation methods, easy residual sodium, and low porosity, and achieve the effects of good mutual adhesion, uniform distribution, and high porosity

Pending Publication Date: 2021-01-29
江苏省陶瓷研究所有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation method of this patented technology is cumbersome, and sodium is easy to remain, large shrinkage, and low porosity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Alumina fiber-magnesia-alumina spinel porous ceramics are made from the following raw materials in parts by mass:

[0030] 100 parts of main ingredients, the main ingredients include: activated alumina powder, light magnesium carbonate powder and alumina chopped fibers, wherein according to the mass ratio, activated alumina powder: light magnesium carbonate powder: alumina chopped fibers is 25: 60:10; 0.1 part of dispersant; 0.5 part of binder; 150 parts of water.

[0031] Light magnesium carbonate including MgCO 3 , Mg(OH) 2 and 2 O, where MgCO 3 : Mg(OH) 2 :H 2 The mass ratio of O is 70:10:13.

[0032] The alumina chopped fibers have a diameter of 3-5 μm and a length of less than 1 mm.

[0033] The particle size of the activated alumina powder is 0.1 μm to 2 μm.

[0034] The compressive strength of alumina fiber-magnesia aluminum spinel porous ceramics is ≥5.2MPa; the apparent porosity is 80%.

Embodiment 2

[0036] Alumina fiber-magnesia-alumina spinel porous ceramics are made from the following raw materials in parts by mass:

[0037] 100 parts of main ingredients, the main ingredients include: activated alumina powder, light magnesium carbonate powder and alumina chopped fibers, wherein according to the mass ratio, activated alumina powder: light magnesium carbonate powder: alumina chopped fibers is 30: 55:11; 0.2 parts of dispersant; 0.7 parts of binder; 160 parts of water.

[0038] Light magnesium carbonate including MgCO 3 , Mg(OH) 2 and 2 O, where MgCO 3 : Mg(OH) 2 :H 2 O's is 71:11:14.

[0039] The alumina chopped fibers have a diameter of 3-5 μm and a length of less than 1 mm.

[0040] The particle size of the activated alumina powder is 0.1 μm to 2 μm.

[0041] The compressive strength of alumina fiber-magnesia aluminum spinel porous ceramics is ≥7.3MPa; the apparent porosity is 82%.

Embodiment 3

[0043] Alumina fiber-magnesia-alumina spinel porous ceramics are made from the following raw materials in parts by mass:

[0044] 100 parts of main ingredients, the main ingredients include: activated alumina powder, light magnesium carbonate powder and alumina chopped fibers, wherein according to the mass ratio, activated alumina powder: light magnesium carbonate powder: alumina chopped fibers is 35: 50:12;

[0045] 0.3 parts of dispersant; 1 part of binder; 170 parts of water.

[0046] Light magnesium carbonate including MgCO 3 , Mg(OH) 2 and 2 O, where MgCO 3 : Mg(OH) 2 :H 2 O's is 72:12:15.

[0047] The alumina chopped fibers have a diameter of 3-5 μm and a length of less than 1 mm.

[0048] The particle size of the activated alumina powder is 0.1 μm to 2 μm.

[0049] The compressive strength of alumina fiber-magnesia aluminum spinel porous ceramics is ≥5MPa; the apparent porosity is 84%.

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Abstract

The present invention relates to a porous ceramic, particularly to an alumina fiber magnesium aluminate spinel porous ceramic, which is prepared from the following raw materials by mass: 100 parts ofa main material, wherein the main material comprises active alumina powder, light magnesium carbonate powder and alumina chopped fibers, and a mass ratio of the active alumina powder to the light magnesium carbonate powder to the alumina chopped fibers is 25-50: 60-40: 10-15; 0.1 to 0.8 part of a dispersant; 0.5 to 1.8 parts of a binding agent; 150 to 220 parts of water. The alumina fiber magnesium aluminate spinel porous ceramic provided by the invention has an open through structure, the volume of the alumina fiber magnesium aluminate spinel porous ceramic after being calcined and cooled islarger than that of a green body, firing expansion occurs, the fiber not only plays a role of a framework, but also reacts with the raw material light magnesium carbonate to generate the magnesium aluminate spinel porous ceramic, and the structural strength is good. High porosity and compressive strength are realized.

Description

technical field [0001] The invention relates to a porous ceramic, especially an alumina fiber-magnesium aluminum spinel porous ceramic and a preparation method thereof. Background technique [0002] Porous ceramics are ceramics with pores as the main phase, and are widely used because of their excellent properties such as light weight, high temperature resistance, low thermal conductivity, good thermal stability, stable chemical properties, and large specific surface area. The commonly used preparation methods of porous ceramics include extrusion molding, direct stacking, organic foam impregnation, pore-forming agent method, direct foaming method, freeze-drying method, etc., such as "a preparation method of porous alumina composite ceramics" (CN 103232228 B) Patented technology, using alumina as the matrix and diatomaceous earth as the pore-forming agent to prepare porous alumina composite ceramics. For example, in the patented technology of "Preparation Method of Alumina P...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/443C04B35/80C04B35/622C04B35/626C04B35/64C04B38/02
CPCC04B35/443C04B35/622C04B35/6261C04B35/64C04B38/02C04B2235/5224C04B2235/526C04B2235/5264C04B2235/5445C04B2235/5436C04B2235/6562C04B2235/77C04B2235/96
Inventor 邱永斌王跃超张雷徐泽跃张弘毅刘成宝
Owner 江苏省陶瓷研究所有限公司
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