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Aluminium borate composite porous ceramics and its preparation method

A technology of porous ceramics and aluminum borate, applied in the field of porous ceramics, can solve problems such as complex processes, and achieve the effects of simple process, good thermal insulation and air permeability, and easy production

Inactive Publication Date: 2006-02-08
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the invention can produce aluminum borate ceramics with a porosity of 40-60% and a pore size of 0.5-5 μm, the two-step calcination process is relatively complicated.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The electric fused white corundum of 1.0-0.2 mm is mixed with the mixed powder at a weight ratio of 60-80 / 20-40. The mixed powder consists of 9-15wt% fused white corundum fine powder, 15-30wt% α-Al 2 o 3 The fine powder, 20-50wt% aluminum hydroxide fine powder and boric acid powder are mixed. After mixing, the range of AlxByOz is x=18, y=4, z=33, plus 2-5wt% clay, mixed for 10-15 minutes, and machine-pressed at 100-300MPa. Dry at 100-110°C for 24 hours, then heat to 280-450°C at a heating rate of 100-200°C / h, and keep warm for 30-200 minutes; then heat at a heating rate of 100-200°C / h to 800- 1600°C, keep warm for 30-240 minutes, take it out after natural cooling.

[0018] Its phase composition was analyzed by X-ray diffraction, and the main phase was aluminum borate (9Al 2 o 3 .2B 2 o 3 ) and corundum phase. The measured bulk density is 2.54g / cm 3 , the apparent porosity is 35%, the compressive strength is 45MPa, and the air permeability is 0.44μm 2 . The sa...

Embodiment 2

[0020] The magnesium aluminum spinel of 1-0.5 mm is mixed with the mixed powder at a weight ratio of 50-70 / 30-50. The mixed powder consists of 12-25wt% fused white corundum fine powder, 20-35wt% α-Al 2 o 3 Fine powder, 20-35wt% pseudo-boehmite fine powder and boric acid powder are mixed, the range of AlxByOz after mixing is x=18, y=4, z=33, and 2-5wt% silica sol is added. After mixing for 10-15 minutes, it is machine-pressed under a pressure of 150-200 MPa. Dry at 100-110°C for 24 hours, then heat to 280-450°C at a heating rate of 100-200°C / h, and keep warm for 30-200 minutes; then heat at a heating rate of 100-200°C / h to 800- 1600°C, keep warm for 30-240 minutes, take it out after natural cooling.

[0021] Its phase composition was analyzed by X-ray diffraction, and the main phase was aluminum borate (9Al 2 o 3 .2B 2 o 3 ) and magnesium aluminum spinel phase. The measured bulk density is 2.12g / cm 3 , the apparent porosity is 40%, the compressive strength is 40MPa, an...

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Abstract

The invention relates to an aluminium borate composite porous ceramic and method for preparation, which comprises mixing aggregate with mixed powder by the weight ratio of 20-90 / 10-80, charging 1-6 wt% anchoring agent, mixing and forming, drying 20-30 hours at 90-120 deg. C, elevating temperature to 200-500 deg. C then thermally insulating 20-280 minutes, then elevating temperature to 700-1700 deg. C then thermally insulating 30-600 minutes, naturally cooling, wherein the process for preparing the mixed powder comprises, mixing fines containing aluminium compounds with boracic acid powder, thus obtaining AlxByOz, wherein x=16-22, y=2-5, z=30-36. The fines comprise Al2O3, Al2O3.3H2O and Al2O3.H2O by the proportion of 0-70 wt%, 0-80 wt% and 0-70 wt%.

Description

1. Technical field [0001] The invention belongs to the technical field of porous ceramics, in particular to an aluminum borate composite porous ceramic and a preparation method thereof. 2. Background technology [0002] Because porous ceramics have the advantages of low density, high permeability, corrosion resistance, good heat insulation performance, high temperature resistance and long service life, they can be used as high temperature gas filters, solid particle filters, molten metal filters for It is used in high temperature equipment that requires chemical corrosion resistance and good permeability, as well as a separator for physical separation, a catalyst carrier for treating waste from chemical plants and automobile exhaust, etc. They can also be used as refractory materials, heat insulation materials, sensors, thermistors and porous piezoelectric ceramics, heat exchangers, etc. In addition, they also have potential applications in the biomedical field. In short, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/01C04B38/00C04B35/622
Inventor 李远兵李楠
Owner WUHAN UNIV OF SCI & TECH
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