A large-scale thin-walled cordierite honeycomb ceramic carrier mud and its preparation method

A cordierite honeycomb, ceramic carrier technology, applied in ceramic products, other household appliances, household appliances and other directions, can solve the problems of easy damage to equipment molds, poor mud fluidity, large extrusion resistance, etc., to reduce firing cracking, Low molding pressure and lower thermal expansion coefficient

Active Publication Date: 2019-04-16
CHONGQING AOFU FINE CERAMICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of large-scale thin-walled cordierite honeycomb ceramic carrier mud produced by traditional preparation technology, there are problems such as large amount of water, difficulty in drying, large drying shrinkage, easy drying and cracking, poor fluidity of the mud, high extrusion resistance, and easy damage to equipment molds, etc. The invention provides a mud material for a large-scale thin-walled cordierite honeycomb ceramic carrier, including inorganic raw materials, organic binders, water and silane coupling agents, and the inorganic raw materials are composed of flaky talc, flaky water-washed kaolin, Aluminum, fused silica composition

Method used

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  • A large-scale thin-walled cordierite honeycomb ceramic carrier mud and its preparation method
  • A large-scale thin-walled cordierite honeycomb ceramic carrier mud and its preparation method
  • A large-scale thin-walled cordierite honeycomb ceramic carrier mud and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Inorganic powder composition: D50=15 μm flake talc 40.0%, D50=6 μm raw kaolin 29.8%, D50=20 μm flake alumina 21.2%, D50=4.0 μm fused quartz 9.0%. After the inorganic powder is dry-mixed without gravity, add 4% methylcellulose, 0.5% silicone polyether copolymer, 1% soybean oil and 35% water for kneading and vacuum refining. The molding machine operates at 19.0 The pressure of MPa extrudes the mud material into a thin-walled honeycomb ceramic catalyst carrier green body with 300 holes / in2 of Φ13×6in. and a wall thickness of 5mil. After drying, the shrinkage rate of the green body is 3.5%, and the axial compressive strength is tested. : 0.52MPa, bending and thick rib defect rate: 4.5%.

[0021] (2) After firing at 1415° C. and holding the heat for 8 hours, the cordierite catalyst carrier is obtained, and the firing pass rate is 90.1%. Product performance: thermal expansion coefficient 1.0×10-6 / °C (room temperature -800°C), water absorption rate 33%, axial compressive ...

Embodiment 2

[0023] (1) Inorganic powder composition: D50=15 μm flake talc 40.0%, D50=6 μm raw kaolin 29.8%, D50=20 μm flake alumina 21.2%, D50=4.0 μm fused quartz 9.0%. Add 0.2% KH550 silane coupling agent and dry-mix synchronously with the powder to modify the powder.

[0024] (2) Add 5% methyl cellulose, 0.5% silicone polyether copolymer, 1% soybean oil and 25% water, knead and vacuum mud, and the molding machine squeezes the mud with a pressure of 13.8MPa The thin-walled honeycomb ceramic catalyst carrier green body with Φ13×6in. 300 holes / in2 and wall thickness 5mil was tested after drying. The drying shrinkage: 3.1%, the axial compressive strength: 1.10MPa, and the defects of bending ribs and thick ribs Rate: 3.0%.

[0025] (3) After firing at 1415°C and keeping it warm for 8 hours, the cordierite catalyst carrier was obtained with a firing pass rate of 95.5%. Product performance: thermal expansion coefficient 0.92×10-6 / °C (room temperature-800°C), water absorption rate 31.2%, The ...

Embodiment 3

[0027] (1) Inorganic powder composition: D50=15 μm flake talc 40.0%, D50=6 μm raw kaolin 29.8%, D50=20 μm flake alumina 21.2%, D50=4.0 μm fused quartz 9.0%. Add 0.4% of KH550 silane coupling agent and dry mix synchronously with the powder to modify the powder.

[0028] (2) Add 5% methyl cellulose, 0.5% silicone polyether copolymer, 1% soybean oil and 25% water, knead and vacuum mud, the molding machine squeezes the mud with a pressure of 11.9MPa The thin-walled honeycomb ceramic catalyst carrier green body with Φ13×6in. 300 holes / in2 and wall thickness 5mil was tested after drying. The drying shrinkage: 2.9%, the axial compressive strength: 1.32MPa, and the defects of bending ribs and thick ribs Rate: 2.2%.

[0029] (3) After firing at 1415°C and keeping it warm for 8 hours, the cordierite catalyst carrier was obtained with a firing pass rate of 97.2%. Product performance: thermal expansion coefficient 0.86×10-6 / °C (room temperature-800°C), water absorption rate 30.2%, The a...

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Abstract

The invention discloses large-size thin-wall cordierite honeycomb ceramics carrier mud, which is prepared from inorganic raw materials, an organic binder, water and a silane coupling agent, wherein the inorganic raw materials consist of flake-like talc, flake-like washed kaolin, flake-like aluminium oxide and electroquartz. The silane coupling agent is used for carrying out surface modification on the inorganic raw materials including the flake-like talc, the flake-like washed kaolin, the flake-like aluminium oxide and the electroquartz, and the silane coupling agent forms a substituent group-OSi(CH3)2- on the surface of the raw materials to enable the inorganic raw materials to have hydrophobicity. The large-size cordierite honeycomb ceramics carrier mud prepared from the surface-modified inorganic raw materials has the advantages of small hydration shell thickness and small drying shrinkage and can effectively lower a coefficient of thermal expansion; since the mud has good liquidity, forming pressure is low, the abrasion degrees of forming equipment and moulds can be effectively lowered, meanwhile, the surface substituent group-OSi(CH3)2- can form an -O-Si-O-Si-three-dimensional network in a carrier, green body strength is improved, sintering cracks are reduced, and a high sintering yield can be obtained.

Description

technical field [0001] The invention relates to a large-scale thin-walled cordierite honeycomb ceramic carrier mud and a preparation method thereof. Background technique [0002] The large size cordierite honeycomb ceramic carrier with diameter ≥ 10.5in. is the catalyst carrier for gaseous pollution emission post-treatment technology of medium and large internal combustion engines, such as: SCR carrier for selective catalytic reduction of diesel engine, TWC carrier for three-way catalytic converter of clean fuel internal combustion engine, oxidation Catalytic converter DOC carrier and ammonia escape converter ASC carrier, etc. National V and VI emission regulations have lower emission limits for motor vehicle exhaust pollutants and the rapid tightening of motor vehicle economic regulations require that the wall thickness of the honeycomb ceramic carrier must be reduced to less than 5mil to obtain a larger catalyst coating. Covered surface area and lower flow resistance. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/00C04B35/195C04B35/632
CPCC04B35/195C04B35/632C04B38/00C04B2235/322C04B2235/3418C04B2235/349
Inventor 黄妃慧刘洪月潘吉庆
Owner CHONGQING AOFU FINE CERAMICS CO LTD
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