Ceramic material of porous spinel, and preparation method

A spinel, ceramic material technology, applied in the field of porous ceramic materials, can solve the problems of limited application range, limited use temperature and use site of finished products, and high impurity content

Inactive Publication Date: 2007-02-21
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] "A magnesium-aluminum lightweight thermal insulation refractory material and its preparation method" (CN200410013257.7) technology, although the produced lightweight thermal insulation material is an alkaline lightweight thermal insulation material, its raw materials are magnesite powder, Lightly burned magnesia powder, high alumina bauxite powder, Al(OH) 3 Powder, incinerable powder, the firing temperature is 1300-1500°C, the impurity content is relatively high, and the firing temperature is low, which leads to restrictions on the use temperature and use parts of the finished product
[0004] There are two reports on magnesium-aluminum lightweight materials: one entitled "Preparation of gel-injected corundum-spinel porous ceramics" (Liu Zuocai, Chen Ying. Gel-injected corundum-spinel porous ceramics Preparation of ceramics. The technology of Beijing Institute of Technology, 2005 (11)) describes the use of platy corundum and aluminum-rich spinel as the main raw materials, us

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] A porous spinel ceramic material and its preparation method: magnesite powder with a particle size of ≤88 μm, Al(OH) with a particle size of ≤88 μm 3 Powder, according to the weight percentage of 24 ~ 36%, 64 ~ 76%, respectively, add 2 ~ 10% water of the weight of the above mixture, after mixing evenly, the material is trapped for 12 ~ 24 hours, 30 ~ 50Mpa machine press molding . Naturally dry in the air for 12-36 hours, then dry at 110°C for 8-16 hours, and burn at 1750-1800°C for 3-5 hours.

[0013] With the product prepared in this embodiment, the apparent porosity is 36-44%, and the bulk density is 1.85-2.25g / cm 3 , The average pore size is 5.35~11.01μm, and the compressive strength is 36~55MPa spinel light insulation material.

Embodiment 2

[0015] A porous spinel ceramic material and its preparation method: magnesite powder with a particle size of ≤88 μm, Al(OH) with a particle size of ≤88 μm 3 Powder, according to the percentage by weight is 47 ~ 79%, 21 ~ 53% respectively for batching, plus 2 ~ 10% water and 3% sodium carboxymethyl cellulose of the weight of the above mixture, mix evenly and trap 24 Hours, 50 ~ 80MPa machine press molding. Naturally dry in the air for 24-36 hours, then dry at 110°C for 12-24 hours, and then burn at 1600-1650°C for 3-5 hours.

[0016] With the product prepared in this example, the apparent porosity can be obtained from 40 to 62%, and the bulk density can be 1.28 to 2.15g / cm 3 The periclase-spinel porous ceramic material.

Embodiment 3

[0018] A porous spinel ceramic material and its preparation method: magnesite powder with a particle size of ≤88 μm, Al(OH) with a particle size of ≤88 μm 3 The powder is prepared according to the weight percentage of 11-24% and 76-89% respectively, and the water of 2-10% of the weight of the above-mentioned mixture is added and mixed evenly. After the material is trapped for 16-24 hours, it is pressed into shape at 10-30 MPa. Naturally dry in the air for 16-24 hours, then dry at 110°C for 8-24 hours, and then burn at 1750-1800°C for 5-8 hours.

[0019] Using the product prepared in this example, the apparent porosity can be obtained as 36-39%, and the bulk density is 2.22-2.40g / cm 3 , A corundum-spinel porous ceramic material with an average pore diameter of 4.91-5.32 μm and a compressive strength of 48-54 MPa.

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Abstract

This invention relates to a method for preparing porous spinel ceramic material. The method comprises: (1) mixing magnesite powder 10-90 wt.%, Al(OH)3 powder 10-90 wt.%, water 2-10 wt.% and adhesive 0-3 wt.%; (2) molding; (3) drying the green bodies at 110 deg.C for 4-24 h; (4) sintering at 1600-1800 deg.C, and keeping the temperature for 1-8 h. The porous spinel ceramic material mainly contains MgO and Al2O3, and has main crystal phase of periclase-spinel, spinel or spinel-corundum. The porous spinel ceramic material can be directly contacted with flame retardant magmesium and spinel materials, and is a lightweight heat-insulating flame retardant with uniform pore distribution and high strength.

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 periclase, spinel and corundum as main phase components and a preparation method thereof. 2. Background technology [0002] Most of the existing lightweight thermal insulation refractory materials are aluminum-silicon materials. The main chemical composition is Al 2 o 3 with SiO 2 . The main phases are corundum, mullite, quartz phase and glass phase. With the improvement of steel quality and variety requirements, the requirements for steel purity are getting higher and higher. Basic refractories are considered to be an ideal refractory material that can meet the requirements of pure steel production. In general, basic refractory materials, such as magnesia bricks, are directly used as furnace lining materials that are in direct contact with molten steel, and a layer of thermal insulation mater...

Claims

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Application Information

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IPC IPC(8): C04B35/443C04B38/00B28B3/00
Inventor 李楠鄢文
Owner WUHAN UNIV OF SCI & TECH
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