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Porous alumina ceramic plate, and preparation method thereof

A porous alumina, ceramic plate technology, applied in ceramic products, other household appliances, applications, etc., can solve the problems of rough surface, easy to drop particles, cracking of ceramic sheets, etc., and achieve uniform internal compactness, uniform size distribution, and smoothness. high degree of effect

Inactive Publication Date: 2019-10-15
NANCHONG THREE CIRCLE ELECTRONICS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, dry press molding has the following disadvantages: (1) The particle size of the powder used in dry press molding is relatively large (2-6 μm), and the combination between the particles after molding is relatively loose, resulting in a low degree of smoothness on the surface of the green body and sintering. After that, the surface is rough (roughness>7μm), and due to the poor bonding force between the particles, the porcelain-made fireproof sheet is easy to drop particles after a period of use; (2) Since the green body formed by dry pressing has no toughness, it cannot be made Thinner blanks are obtained, so the interfired sheets obtained by this molding method are relatively thick (2-4mm in thickness) and heavy in weight (100-200g); if the weight is to be reduced, subsequent grinding and polishing must be carried out.
However, due to the high hardness of the fire barrier itself, it is difficult to polish, and the polishing process is likely to cause damage to the surface of the fire barrier and the particles to fall off. Therefore, the lightest weight of the fire barrier in the existing market can only be around 90g , can no longer go down; (3) The internal compactness of the green body formed by dry pressing is inconsistent, cracking is easy to occur during the sintering process, and the surface flatness is also poor. High; (4) The porosity is obtained by adding a pore-forming agent. After the organic compound is sintered, the gas is discharged to form pores. The size distribution of the pores obtained in this way is uneven, and the process of gas discharge is easy to cause cracking of the ceramic sheet, and the surface is porous and uneven.
[0004] Therefore, the porous alumina ceramic plates in the existing market generally have a rough surface and are easy to drop particles.
At the same time, the thickness is thick and the weight is heavy. The only way to reduce the weight is through subsequent polishing. Not only the cost of polishing is high, but even if it is polished, it is difficult to achieve lighter quality and surface roughness.

Method used

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  • Porous alumina ceramic plate, and preparation method thereof
  • Porous alumina ceramic plate, and preparation method thereof
  • Porous alumina ceramic plate, and preparation method thereof

Examples

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Embodiment 1

[0036] An embodiment of the porous alumina ceramic plate of the present invention, the porous alumina ceramic plate described in this embodiment is prepared by the following preparation method:

[0037] (1) Preparation of slurry: In parts by weight, weigh 99 parts of alumina powder, add 85 parts of a mixed solvent of butanone and ethanol (1:1), and 2 parts of triolein. Use a planetary ball mill at 400 rpm for 12 hours to mix evenly, then add 6 parts of polyvinyl butyral binder, 5 parts of dibutyl phthalate plasticizer, and then use The planetary ball mill was ball milled for 24 hours under the condition of 400 r / min to mix evenly, and then sieved through a 100-mesh sieve.

[0038] (2) Tape casting: the slurry after ball milling was stirred in vacuum for 2 hours, the stirring speed was 40rpm / min, the viscosity of the slurry was controlled at 15000mPa. The blank thickness is 0.7mm, and the cutting width is 140mm. The blank roll is cut again, and cut into a green body with a si...

Embodiment 2

[0041] An embodiment of the porous alumina ceramic plate of the present invention, the porous alumina ceramic plate described in this embodiment is prepared by the following preparation method:

[0042] (1) Preparation of slurry: in parts by weight, put 98 parts of alumina powder, 1 part of sintering aid (zirconia), 90 parts of solvent (acetone), and 1 part of dispersant (oleic acid) in a planetary ball mill 10 hours at a speed of 530 rpm; then 6 parts of a plasticizer (dioctyl phthalate) and 5 parts of a binder (acrylic resin) were added, and ball milled at a speed of 530 rpm for 12 hours. Sieve through a 100-mesh sieve to obtain a slurry.

[0043] (2) Tape casting: the slurry after ball milling is vacuum stirred for 2.5 hours, the stirring speed is 40rpm / min, the viscosity of the slurry is controlled at 20000mPa.s, and then cast on the casting machine, the blade height is 1.5mm, and the casting speed 0.4m / min, the thickness of the obtained green body is 0.7mm, and the cutti...

Embodiment 3

[0046] An embodiment of the porous alumina ceramic plate of the present invention, the porous alumina ceramic plate described in this embodiment is prepared by the following preparation method:

[0047] (1) Preparation of slurry: in parts by weight, 99.6 parts of alumina powder, 0.2 parts of sintering aid (magnesia, yttrium oxide mixed at a mass ratio of 1:1), 85 parts of solvent (terpineol), dispersed Place 2 parts of plasticizer (phosphate grease) in a planetary ball mill and ball mill for 25 hours at a speed of 400 rpm; then add 8 parts of plasticizer (phthalate) and 9 parts of binder (phenolic resin) , ball milled at a speed of 100 rpm for 25 hours, and sieved through a 100-mesh sieve to obtain a slurry.

[0048] (2) Tape casting: the slurry after ball milling is stirred in vacuum for 1 hour, the stirring speed is 30rpm / min, the viscosity of the slurry is controlled at 10000mPa.s, and then cast on the casting machine, the blade height is 0.5mm, and the casting speed 0.1m / ...

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Abstract

The invention discloses a preparation method of a porous alumina ceramic plate. The preparation method comprises following steps: 1, a slurry is prepared, wherein alumina powder, a sintering aid, a solvent, a dispersant, a plasticizer, and a binder are subjected to ball milling, and are mixed uniformly so as to obtain a slurry; 2, tape casting is carried out, wherein the slurry obtained in step 1is subjected to vacuum stirring defoaming, and is subjected to tape casting so as to obtain a ceramic blank; and 3, sintering is carried out, wherein the ceramic blank obtained in step 2 is subjectedto drying, thermal insulation degumming, sintering, and cooling so as to obtain the porous alumina ceramic plate. The porous alumina ceramic plate is low in preparation cost, high in porosity, and smooth in surface.

Description

technical field [0001] The invention relates to a ceramic plate and a preparation method thereof, in particular to a porous alumina ceramic plate and a preparation method thereof. Background technique [0002] Porous alumina ceramic plates mainly play a certain role in pressure and insulation during sintering of chip ceramics, and are also generally called ceramic cover plates or insulation sheets. The existing production process of fire-proof tablets is mainly dry pressing molding: granulation→adding appropriate amount of additives to mix to make a billet to be pressed→selecting a suitable mold→adjusting pressing parameters→pressing molding→demolding→drying→sintering. [0003] However, dry press molding has the following disadvantages: (1) The particle size of the powder used in dry press molding is relatively large (2-6 μm), and the combination between the particles after molding is relatively loose, resulting in a low degree of smoothness on the surface of the green body ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/00C04B35/10C04B35/622C04B35/64
CPCC04B35/10C04B35/622C04B35/64C04B38/00C04B2235/3206C04B2235/3225C04B2235/3232C04B2235/3241C04B2235/3244
Inventor 黄雪云邱基华江楠
Owner NANCHONG THREE CIRCLE ELECTRONICS
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