Porous mullite ceramic materials and method for preparing same

A technology of porous mullite and ceramic materials, which is applied in the field of lightweight thermal insulation refractory materials and its preparation, and can solve the problems of easy agglomeration of combustible powder, limitation of combustible powder, and inability to prepare porosity, etc.

Inactive Publication Date: 2006-12-27
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is: when the combustibles are not burnt out, it is easy to form a "black core" in the material; the combustible powder is easy to agglomerate in the powder, resulting in the disadvantages of uneven size and uneven distribution of pores in the material. The amount of combustible powder is limited, and materials with high porosity cannot be prepared
[0009] Although the literature "Study on the Synthesis of Mullite Clinker from Coal Gangue" ("Mineral Rock", Volume 18, Issue 4) reported that coal gangue and Al(OH) 3 Mullite clinker was prepared as a raw material, but it was a dense material with a bulk density > 2.51g / cm 3

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A porous mullite ceramic material and its preparation method: coal gangue powder with a particle size of 53-75 μm and Al(OH) 3 The powder is compounded according to the weight percentage of 32-16% and 68-84%, and the water of 2-10% of the weight of the above-mentioned mixture is added, and mixed and stirred. The material is trapped for 18-24 hours, and it is machine-pressed at a pressure of 30-50Mpa. The molded body is naturally dried in the air for 24 hours, then dried at 110°C for 8-16 hours, and fired at 1500°C. 3 to 5 hours.

[0017] The product obtained by the preparation method of this example can obtain an apparent porosity of 54-62% and a bulk density of 1.42-1.50 g / cm 3 , Mullite-corundum lightweight insulation material with an average pore size of 400-600nm.

Embodiment 2

[0019] A method for preparing a porous mullite ceramic material: coal gangue powder with a particle size of 10-88 μm and Al(OH) 3 The powder is mixed according to the weight percentage of 46-32% and 54-68% respectively, and 2-10% of the water and 1.5-2.5% of the weight of the above mixture are added. 3 and 1.0-2.0% CaCO 3 Mix and stir. The material is trapped for 18-24 hours, and it is machine-pressed under a pressure of 80-100Mpa. Naturally dry in the air for 16-24 hours, then dry at 110°C for 8-16 hours, and then burn at 1500°C for 3-5 hours.

[0020] The product obtained by the preparation method of this example can obtain an apparent porosity of 40-50%, and a bulk density of 1.74-1.91g / cm 3 , Corundum-mullite lightweight insulation material with an average pore size of 3.273-4.475μm and a compressive strength of 54-60Mpa.

Embodiment 3

[0022] A method for preparing a porous mullite ceramic material: coal gangue powder with a particle size of 10-88 μm and Al(OH) 3 powder, according to the weight percentage of 46-50%, 54-50% for batching, plus 2-10% of the weight of the above mixture of water and 1.9-2.9% of MgCO 3 Mix and stir. The material is trapped for 16-24 hours, and it is machine-pressed under a pressure of 30-50Mpa. Naturally dry in the air for 24-32 hours, then dry at 110°C for 16-24 hours, and then burn at 1500°C. The holding time is 3-5 hours.

[0023] The product obtained by the preparation method of this example can obtain an apparent porosity of 44-48%, and a bulk density of 1.88-1.92g / cm 3 , Mullite-corundum lightweight thermal insulation material with an average pore diameter of 2.202-3.247μm and a compressive strength of 52-58Mpa.

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Abstract

The invention discloses a porous mullite ceramic material and preparing method, which comprises the following steps: dispensing 10-50 percent coal gangue powder, 50-90 percent Al (OH) 3, 2-10 percent water and 0-10 percent addictive; stirring; moulding; drying the mould at 110 deg.c for 4-24 h; sintering at 1400-1600 deg.c for 1-8 h. The chemical component of product is SiO2 and Al2O3, wherein the main crystal phase is mullite or mullite-alumina, which can be high-strength and light-quality insulating flame-proof material.

Description

1. Technical field [0001] The invention belongs to the field of porous ceramic materials. In particular, it relates to a light-weight thermal insulation refractory material with mullite and corundum as main phase components and a preparation method thereof. 2. Background technology [0002] Most of the current insulation materials are Al 2 o 3 -SiO 2 Department of materials (Wang Weibang. Refractory Technology. Metallurgical Industry Press, 2003), the main phases are corundum, mullite, quartz phase and glass phase. The pore size of these insulation materials is relatively large, and the pore distribution is uneven. From the perspective of pore-making technology, there are currently two main methods for preparing porous ceramic materials and lightweight thermal insulation refractory materials: [0003] 1. Add combustibles [0004] Add combustibles into ceramic or refractory powder, such as sawdust, coal powder, coke powder, expanded polystyrene balls, etc. After molding...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/185C04B35/622C04B38/06B28B3/00
Inventor 李楠鄢文李淑静
Owner WUHAN UNIV OF SCI & TECH
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