Method for improving strength of superlight foamed ceramic body

A technology of foam ceramics and ceramic powder, which is applied in the field of enhancing the strength of ultra-light foam ceramic bodies, can solve the problems of weakening the strength of foam ceramics and stability in use, and achieves the effects of low production cost, good processability, and increased strength

Active Publication Date: 2017-08-04
北京华圻生态科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods inevitably introduce impurity phases, which weaken the strength and stability of foamed ceramics.

Method used

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  • Method for improving strength of superlight foamed ceramic body
  • Method for improving strength of superlight foamed ceramic body

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Prepare alumina slurry with a mass fraction of 20%, and use a roller mill to mill for 2 hours. The average particle size of the alumina ceramic powder is 0.41 μm.

[0024] (2) Add 0.05wt% sodium lauryl sulfate and 1.0wt% polyvinyl alcohol to the slurry after ball milling to adjust the pH value of the slurry to 4.5.

[0025] (3) The slurry was then mechanically stirred at a rotational speed of 1800rmp for 10min for foaming to obtain a particle-stabilized foam.

[0026] (4) Immediately freeze the resulting foam slurry at -10°C for 20 hours after foaming, and then thaw at 10°C for 6 hours. Repeat the freeze-thaw process 2 times.

[0027] (5) The dried ceramic foam body was heated to 1550° C. at a heating rate of 3° C. / min, and then kept for 2 hours.

[0028] The prepared alumina foam body is as figure 1 As shown in the macroscopic photo of the alumina foam body, the porosity is 97.1%, and the microscopic appearance of the foam body is as follows: figure 2 shown. ...

Embodiment 2

[0030] (1) Prepare a zirconia slurry with a mass fraction of 30%, and use a roller mill to mill for 4 hours. The average particle size of the zirconia ceramic powder is 0.76 μm.

[0031] (2) Add 0.06wt% cetyl sodium sulfate and 1.2wt% polyvinyl alcohol relative to the mass of the slurry to the slurry after ball milling to adjust the pH value of the slurry to 5.1.

[0032] (3) The slurry was then mechanically stirred at a rotational speed of 1600rmp for 15min for foaming to obtain a particle-stabilized foam.

[0033] (4) Immediately freeze the resulting foam slurry at -10°C for 24 hours after foaming, and then thaw at 10°C for 4 hours. Repeat the freeze-thaw process 3 times.

[0034] (5) The dried ceramic foam body was heated to 1400° C. at a heating rate of 3° C. / min, and then kept for 2 hours.

[0035] The porosity of the prepared zirconia foam body was 95.9%, and the porosity of the zirconia foam ceramics prepared after sintering was 93.4%.

Embodiment 3

[0037] (1) Prepare a kyanite slurry with a mass fraction of 30%, and use a roller ball mill to mill for 5 hours. The average particle size of the kyanite powder is 0.98 μm.

[0038] (2) Add 0.05wt% sodium lauryl sulfate and 0.8wt% polyvinyl alcohol relative to the mass of the slurry to the slurry after ball milling, and adjust the pH value of the slurry to 6.0.

[0039] (3) The slurry was then mechanically stirred at a rotational speed of 1800rmp for 10min for foaming to obtain a particle-stabilized foam.

[0040] (4) Immediately freeze the resulting foam slurry at -10°C for 24 hours after foaming, and then thaw at 10°C for 3 hours. Repeat the freeze-thaw process 3 times.

[0041](5) The dried ceramic foam body was heated to 1450° C. at a heating rate of 3° C. / min, and then kept for 2 hours.

[0042] The porosity of the prepared kyanite foam body is 94.8%, and the porosity of the foam ceramics prepared after sintering is 92.2%.

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Abstract

The invention develops a method for improving the strength of a superlight foamed ceramic body by freezing and unfreezing polyvinyl alcohol. The method comprises the following steps: ball-milling and dispersing ceramic slurry, adding a surface hydrophobization modifier and polyvinyl alcohol, regulating the PH value of the slurry to an appropriate range, mechanically stirring and foaming the slurry to obtain particle stable foam slurry, freezing and unfreezing the foam slurry to obtain foam gel. The foam gel is directly sintered after being dried. According to the method, the superlight dry foamed ceramic body (hereinafter referred to as foam body) with the porosity of 92%-98% is obtained. After the polyvinyl alcohol is strengthened through freezing and unfreezing, the strength of the obtained superlight foam body is obviously improved, and the superlight foam body is guaranteed not to be broken in the transportation process. Furthermore, the prepared foam body is excellent in machinability, and is sintered after mechanical processing like cutting and engraving, and the processing cost of the foamed ceramic is lowered.

Description

technical field [0001] The invention belongs to the technical field of foam ceramic preparation, and in particular relates to a method for enhancing the strength of an ultra-light foam ceramic body. Background technique [0002] Ceramic foam has the dual advantages of ceramic material and porous material, so it has many characteristics such as light weight, heat preservation, heat insulation, high temperature resistance, chemical corrosion resistance, etc., so it is widely used in fluid filtration, catalyst carrier, heat, electricity, sound and other insulating materials and Artificial bones and other fields. [0003] Compared with other methods, the slurry direct foaming method is easier to prepare high-porosity foamed ceramics, and its preparation process is relatively simple. The key to the direct foaming method lies in the stability of the ceramic foam, because the foam is a thermodynamically unstable system due to the huge surface energy of the foam and the escape tend...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/622C04B38/10C04B35/10C04B35/18C04B35/48C04B35/565C04B35/584
CPCC04B35/10C04B35/18C04B35/48C04B35/565C04B35/584C04B35/622C04B38/10
Inventor 杨金龙霍文龙张笑妍陈雨谷刘静静张在娟闫姝席小庆王亚利
Owner 北京华圻生态科技有限公司
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