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Kyanite-based reinforced ultralight foam ceramic containing titanium dioxide coating and preparation method thereof

A technology of foam ceramics and titanium dioxide, which is applied in the field of foam ceramic materials, can solve the problems of poor stability of ceramic foam, weaken the strength and stability of foam ceramics, and achieve low production costs, shorten drying time, and improve drying performance.

Inactive Publication Date: 2017-12-15
DONGGUAN LIANZHOU INTPROP OPERATION MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen from the above prior art that it is easier to prepare high-porosity foam ceramics by freeze-drying than other methods, and the preparation process is simple, but the stability of the ceramic foam is not good, and other materials need to be added to assist curing, which inevitably weakens the foam. The strength and stability of ceramics

Method used

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  • Kyanite-based reinforced ultralight foam ceramic containing titanium dioxide coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Kyanite powder with a particle size of 1μm is added to deionized water to make 15% ceramic slurry, according to the ceramic slurry, anorthite, carbon fiber, ceramic powder hydrophobic modifier and polyvinyl alcohol The mass ratio is 100:20:2:0.06:1.2, adding anorthite as a sintering aid, ball milling and dispersing for 5 hours, adding carbon fiber, sodium lauryl sulfate and polyvinyl alcohol, adjusting the slurry pH to 4.5, and using 1500r / min speed rapid shearing and stirring for 10 minutes to foam to obtain particle stable foam.

[0028] (2) Immediately freeze the particle-stabilized foam at -10°C for 12h, then thaw it at 0°C for 3h, repeat the freezing and thawing process once to obtain a foamed ceramic body, and heat it up to 1400 at a rate of 4°C / min ℃, sintering for 2h, after cooling to obtain foam ceramics.

[0029] (3) Completely immerse the ceramic foam in 2mol / L hydrochloric acid, oscillate at 95°C at low speed, take it out, rinse and dry to obtain the acid-p...

Embodiment 2

[0032] (1) Kyanite powder with a particle size of 1.5μm is added to deionized water to make 60% ceramic slurry, according to ceramic slurry, anorthite, carbon fiber, ceramic powder hydrophobization modifier and polyvinyl alcohol The mass ratio is 100:30:5:0.08:1.5, adding anorthite as a sintering aid, ball milling and dispersing for 5 hours, adding carbon fiber, cetyl ammonium chloride and polyvinyl alcohol, adjusting the slurry pH to 6.5, Quickly shear for 10 minutes at a speed of 2500r / min and stir and foam to obtain a stable particle foam.

[0033] (2) Immediately freeze the particle-stabilized foam at -10°C for 24h, then thaw it at 10°C for 12h, repeat the freezing and thawing process 5 times to obtain a foamed ceramic body, and heat it up to 1900 at a rate of 5°C / min ℃, sintering for 3h, and cooling to obtain foam ceramics.

[0034] (3) Completely immerse the ceramic foam in 2mol / L hydrochloric acid, oscillate at a low speed at 100°C, take it out, rinse and dry to obtain the ...

Embodiment 3

[0037] (1) Kyanite powder with a particle size of 1.2μm is added to deionized water to make 45% ceramic slurry, according to ceramic slurry, anorthite, carbon fiber, ceramic powder hydrophobization modifier and polyvinyl alcohol The mass ratio is 100:25:3:0.07:1.3, adding anorthite as a sintering aid, ball milling and dispersing for 5 hours, adding carbon fiber, sodium cetyl sulfate and polyvinyl alcohol, adjusting the slurry pH to 5, 1600r / min speed rapid shearing and stirring for 10min foaming to obtain particle stable foam.

[0038] (2) Immediately freeze the particle-stabilized foam at -10°C for 18h, then thaw it at 5°C for 6h, repeat the freezing and thawing process three times to obtain a foam ceramic body, and heat it up to 1600 at a rate of 4.2°C / min ℃, sintering for 2h, after cooling to obtain foam ceramics.

[0039] (3) Completely immerse the ceramic foam in 2mol / L hydrochloric acid, oscillate at a low speed at 98°C, take it out, rinse and dry to obtain the acid-pretreat...

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Abstract

The invention provides kyanite-based reinforced ultralight foam ceramic containing a titanium dioxide coating and a preparation method thereof. The kyanite-based reinforced ultralight foam ceramic containing the titanium dioxide coating is prepared through the following steps: with kyanite powder as a raw material and anorthite as a sintering auxiliary agent, carrying out crystallization by utilizing polyvinyl alcohol, carrying out reinforcing by utilizing a ceramic powder hydrophobization modifier, then carrying out freeze drying and sintering so as to obtain foam ceramic, and attaching a titania gel layer on the surface of the foam ceramic by utilizing a negative pressure impregnation process so as to prepare the kyanite-based reinforced ultralight foam ceramic containing the titanium dioxide coating. The kyanite-based reinforced ultralight foam ceramic containing the titanium dioxide coating provided by the invention has uniform pore size, isotropy, good combination among ceramic crystalline grains and good adhesion force between the titanium dioxide coating and the ceramic crystalline grains; no impurity phase is introduced into the prepared foam ceramic, so the performances of ceramic may not be weakened; and a foam ceramic green body has good processability, can be processed through processes like cutting and carving, and has the advantages of high strength, light weight, smooth pores, no defects on the surface and improved thermal shock resistance.

Description

Technical field [0001] The invention belongs to the technical field of foam ceramic materials, and specifically relates to a kyanite-based reinforced ultra-light foam ceramic containing a titanium dioxide coating and a preparation method thereof. Background technique [0002] Foam ceramic is a kind of porous ceramic with a foam-like shape. It has three-dimensional connected pores. The shape, size, permeability, and chemical properties of the surface area of ​​the pores can be moderately adjusted. It has light weight, high strength, high temperature resistance, and high temperature resistance. Corrosion, simple regeneration, long service life and good filter adsorption. The freeze-drying process uses ceramic slurry as a raw material to control the unidirectional growth of crystal ice while the ceramic slurry is frozen. Drying is performed under low pressure conditions. At this time, the solvent ice is sublimated and discharged, forming oriented holes in the green body. The struct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/10C04B35/80C04B35/185C04B35/626C04B41/87C04B35/622
CPCC04B38/106C04B35/185C04B35/622C04B35/6261C04B35/62635C04B35/6264C04B35/62655C04B35/803C04B41/009C04B41/5041C04B41/87C04B2235/3481C04B2235/5248C04B2235/60C04B2235/96C04B2235/9607
Inventor 陈东进
Owner DONGGUAN LIANZHOU INTPROP OPERATION MANAGEMENT CO LTD
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