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A high-temperature bending-resistant porous ceramic material and its preparation method and application

A porous ceramic and high-temperature technology, applied in the field of preparation of ceramic materials, can solve problems such as inapplicable metal melt purification, unfavorable industrial production, complicated process flow, etc., to improve high-temperature mechanical properties, thermal shock stability, and high-temperature mechanical properties Excellent thermal shock stability, high efficiency filtration and purification effect

Active Publication Date: 2022-06-21
GUANGDONG INST OF NEW MATERIALS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In the existing process of preparing porous ceramic materials, mineralizers, sintering aids, and various aluminum salts in the mullite precursor solution are often added, which easily introduces impurities into the product and is not suitable for purification of metal melts; in addition , the existing porous ceramic products, the inter-pore connection is a hybrid combination of multi-morphology and multi-group phases. Under high temperature service, uneven thermal stress is prone to occur, resulting in poor thermal shock stability. At the same time, in the preparation of porous ceramic materials In the process, there will be problems such as relatively complicated technological process, which is not conducive to industrial production.

Method used

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  • A high-temperature bending-resistant porous ceramic material and its preparation method and application
  • A high-temperature bending-resistant porous ceramic material and its preparation method and application
  • A high-temperature bending-resistant porous ceramic material and its preparation method and application

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preparation example Construction

[0033] In an alternative embodiment, boride-Al 2 O 3 -The preparation method of the MgO slurry includes: the boride-Al 2 O 3 -MgO powder, vegetable adhesive and deionized water, wet mixed uniformly to obtain B 2 O 3 -Al 2 O 3 -MgO slurry.

[0034] Preferably, boride-Al 2 O 3 -The mass ratio of MgO powder, vegetable adhesive and deionized water is 100:3~12:25~40.

[0035] Preferably, the vegetable adhesive is one of starch glue, dextrin glue, carboxymethyl cellulose glue, and lignin glue.

[0036] In an alternative embodiment, boride-Al 2 O 3 -The preparation of MgO powder includes: combining boride, α-alumina (α-Al 2 O 3 ) and magnesium oxide (MgO) are mixed uniformly by a three-dimensional mixer.

[0037] Preferably, borides, α-alumina (α-Al 2 O 3 ) and magnesium oxide (MgO) in a mass ratio of 1:0.6 to 1:0.4 to 0.6.

[0038] Boride-Al prepared by the above ratio 2 O 3-After the MgO slurry is sintered by endogenous reaction, the magnesia-aluminum spinel tend...

Embodiment 1

[0053] Preparation B 2 O 3 -Al 2 O 3 -MgO powder: weigh industrial grade boron oxide (B 2 O 3 ), α-alumina (α-Al 2 O 3 ), magnesium oxide (MgO), and mix them uniformly in a three-dimensional mixer according to the mass ratio of 1:0.8:0.4, and the mixing time is 4h to obtain B 2 O 3 -Al 2 O 3 -MgO mixed powder;

[0054] Preparation B 2 O 3 -Al 2 O 3 -MgO slurry: B with a mass ratio of 100:3:25 2 O 3 -Al 2 O 3 -MgO mixed powder, starch glue, deionized water ingredients, added to the mixer for wet mixing for 2h, to obtain B 2 O 3 -Al 2 O 3 -MgO slurry;

[0055] Preparation of thixotropic ceramic blanks: the above B 2 O 3 -Al 2 O 3 -MgO slurry and white corundum alumina ceramic particles are mixed in a mass ratio of 1:4, the particle size of white corundum alumina ceramic particles is 10-20 mesh, and the three-dimensional mixer is used to mix for 2 hours, so that B 2 O 3 -Al 2 O 3 -MgO slurry is well coated on the surface of alumina ceramic particles ...

Embodiment 2

[0061] Preparation B 2 O 3 -Al 2 O 3 -MgO powder: weigh industrial grade boron oxide (B 2 O 3 ), α-alumina (α-Al 2 O 3 ), magnesium oxide (MgO), and mix them uniformly in a three-dimensional mixer according to the mass ratio of 1:1:0.6, and the mixing time is 12h to obtain B 2 O 3 -Al 2 O 3 -MgO mixed powder;

[0062] Preparation B 2 O 3 -Al 2 O 3 -MgO slurry: B with a mass ratio of 100:12:25 2 O 3 -Al 2 O 3 - MgO mixed powder, dextrin glue and deionized water are added into the mixer for wet mixing for 8h to obtain B 2 O 3 -Al 2 O 3 -MgO slurry;

[0063] Preparation of thixotropic ceramic blanks: the above B 2 O 3 -Al 2 O 3 -MgO slurry and brown corundum alumina ceramic particles are mixed in a mass ratio of 1:6. The particle size of the brown corundum alumina ceramic particles is 5-10 meshes. The three-dimensional mixer is used to mix for 6 hours, so that B 2 O 3 -Al 2 O 3 -MgO slurry is well coated on the surface of alumina ceramic particles to...

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Abstract

The invention discloses a high-temperature bending-resistant porous ceramic material, a preparation method and application thereof, and relates to the technical field of preparation of ceramic materials. The present invention is based on an endogenous reaction to form a core rich in alumina ceramic particles and a shell containing magnesia-alumina spinel particles and boro-mullite whiskers. The technical scheme is: boride, Al 2 o 3 Mix with MgO fine powder in a certain proportion, then wet mix with plant adhesive and deionized water to form a slurry, add millimeter-sized alumina ceramic particles and mix, so that the slurry is well coated on the surface of alumina ceramic particles, and obtained The thixotropic ceramic blank is machine-pressed, dried and placed in a high-temperature furnace to achieve endogenous reaction sintering to obtain a high-temperature bending-resistant porous ceramic material. The invention has the characteristics of low cost and simple process, and the prepared porous ceramic material has excellent high-temperature mechanical properties and good thermal shock stability, and is suitable for the fields of high-temperature heat insulation, melt purification or smoke filtration.

Description

technical field [0001] The invention relates to the technical field of preparation of ceramic materials, in particular, to a high-temperature bending-resistant porous ceramic material and a preparation method and application thereof. Background technique [0002] Porous ceramic materials have the advantages of low density, high specific surface area, high transmittance, etc., and have broad application prospects in the fields of high temperature heat insulation, smoke filtration, melt purification, etc. At present, porous ceramics containing mullite have both low thermal expansion. coefficient, good thermal shock resistance and low thermal conductivity, excellent mechanical strength and chemical stability at high temperature, is one of the important candidates for molten metal filters. [0003] In the existing process of preparing porous ceramic materials, mineralizers, sintering aids, and various aluminum salts in the mullite precursor solution are often added, which is eas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/10C04B35/628C04B35/622C04B35/81C04B38/00B01D39/20
CPCC04B35/10C04B35/62813C04B35/62807C04B35/622C04B35/80C04B38/00B01D39/2068C04B2235/3206C04B2235/3222C04B2235/3409C04B2235/3463C04B2235/5276C04B2235/5427C04B2235/96C04B2235/9607C04B38/0074
Inventor 林颖菲骆智超路建宁王娟郑开宏
Owner GUANGDONG INST OF NEW MATERIALS
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