High-strength cordierite ceramic honeycomb body and preparation method thereof

A ceramic honeycomb and cordierite technology, which is applied in the field of cordierite ceramic honeycomb and its preparation, can solve the problems of high porosity, high thermal expansion coefficient, isostatic strength, and high thermal shock resistance of cordierite ceramic honeycomb, and achieve thermal expansion Excellent coefficient, high isostatic strength, and high thermal shock resistance

Inactive Publication Date: 2019-09-13
SHANDONG SINOCERA FUNCTIONAL MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the above problems, a high-strength cordierite ceramic honeycomb body and its preparation method are provided. The cordierite ceramic honeycomb body prepared by the method has high porosity, narrow pore distribution, less small pores, excellent thermal expansion coefficient and iso

Method used

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  • High-strength cordierite ceramic honeycomb body and preparation method thereof
  • High-strength cordierite ceramic honeycomb body and preparation method thereof
  • High-strength cordierite ceramic honeycomb body and preparation method thereof

Examples

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preparation example Construction

[0053] According to an embodiment of the present application, the preparation method of cordierite ceramic honeycomb comprises the following steps:

[0054] 1) Mixing: The prepared raw material composition, pore-forming agent, and binder are dry-mixed in a coulter mixer, and then sprayed into a mixed liquid of lubricant and water for wet mixing;

[0055] 2) Mud training: The ceramic primary mixture after wet mixing is transported to the net mud training machine for mud training;

[0056] 3) Extrusion molding: After the mud is turned into mud, it is transported to a single-screw extruder, twin-screw extruder or hydraulic extruder for molding, and the mud becomes a cylindrical wet billet through a mold;

[0057] 4) Microwave drying: After being cut by a wet billet cutting machine, the honeycomb ceramic cylinder is dried and shaped into a green billet by a microwave dryer;

[0058] 5) Green body cutting: the green body is cut to a specific height by the green body cutting machin...

Embodiment 1

[0061] Example 1 Preparation of cordierite ceramic honeycomb body 1#

[0062] Raw material composition #1 that can be fired into cordierite honeycomb ceramics: 40wt% talc with an average particle size of 16-19μm, 10.8wt% kaolin with an average particle size of 6-7μm, and 6% calcined kaolin with an average particle size of 2-3μm 15.2wt% aluminum oxide with an average particle size of 3-4μm, 15.8wt% aluminum hydroxide with an average particle size of 5-8μm and 12.2wt% silicon oxide with an average particle size of 3-5μm.

[0063] Preparation of cordierite ceramic honeycomb body 1#: mix 100Kg raw material composition 1#, 6Kg hydroxypropyl methylcellulose, 10Kg polyphenylene sulfide, 2Kg tall oil fatty acid and 33Kg water in a coulter, after mixing The ceramic primary mixture is kneaded or smelted to make mud. The mud is conveyed to a twin-screw extruder or hydraulic extruder for molding, and the mud passes through a mold to become a cylindrical wet billet. After the wet blank c...

Embodiment 2

[0064] Example 2 Preparation and performance test of cordierite ceramic honeycomb body 2#-8# and comparison cordierite ceramic honeycomb body D1#-D9#

[0065] According to the preparation method of cordierite ceramic honeycomb body 1# in Example 1, cordierite ceramic honeycomb body 2#-8# and contrast cordierite ceramic honeycomb body D1#-D9# were prepared, which were the same as those of cordierite ceramic honeycomb body 1#. The method differences are shown in Table 1.

[0066] Comprehensively evaluate the pores and sintering cracks of the prepared cordierite ceramic honeycomb body 1#-8# and the comparison cordierite ceramic honeycomb body D1#-D9#, 60%≤porosity≤65%, 20μm≤average pore diameter≤24 μm, Df≤0.45, D5≥7μm, the sintered cordierite ceramic honeycomb body without cracking is evaluated as "qualified", and those that do not meet any of the above two evaluation criteria are considered "unqualified", among which, D 5 The corresponding pore volume accounts for 5% of the tot...

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Abstract

The invention discloses a high-strength cordierite ceramic honeycomb body and a preparation method thereof, and belongs to the field of filtering catalytic materials. The raw materials of the preparation method of the cordierite ceramic honeycomb body comprise: a raw material composition, a pore forming agent, a binder and a lubricant, wherein the raw material composition comprises the following components in parts by weight: 38-42 parts of talc, 5-15 parts of kaolin, 4-8 parts of calcined kaolin, 12-18 parts of alumina, 12-18 parts of aluminum hydroxide, 5-15 parts of silicon oxide; and the average particle size of the talc is 15-20 [mu]m, the average particle size of the kaolin is 4-7 [mu]m, the average particle size of the calcined kaolin is 2-3 [mu]m, the average particle size of the alumina is 3-5 [mu]m, the average particle size of the aluminum hydroxide is 5-8 [mu]m, and the average particle size of the silicon oxide is 3-5 [mu]m. The cordierite ceramic honeycomb body has the advantages of excellent thermal expansion coefficient, high isostatic pressure strength, high porosity, narrow pore distribution and few small pores; and therefore, when the cordierite ceramic honeycombbody is used as a filter, the filtering efficiency is high, the back pressure is low, so that the defects are not easy to generate in the processes of transportation, catalyst coating, packaging andthe like, and the thermal shock resistance is high in the using process.

Description

technical field [0001] The application relates to a cordierite ceramic honeycomb body and a preparation method thereof, which belong to the field of filter catalytic materials. Background technique [0002] Particulate filters are used to filter fine particulate matter (PM) from gasoline and diesel vehicle emissions. The particle filter structure is composed of a honeycomb body and a plugging part. The cells separated by the porous walls constitute the honeycomb body, and the plugging parts form a "chess" intersection at the inlet and outlet ends of the honeycomb body. The exhaust gas from the engine passes through the inlet end of the honeycomb filter, the fine particles carried by the gas are intercepted by the sealing part, and the gas passes through the porous partition wall and enters the adjacent compartment to flow out. Honeycomb particulate filter is divided into gasoline particulate filter (GPF) and diesel particulate filter (DPF). The material of honeycomb partic...

Claims

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Application Information

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IPC IPC(8): C04B35/195C04B38/06
CPCC04B35/195C04B38/0006C04B38/067C04B2235/3217C04B2235/3218C04B2235/3418C04B2235/6562C04B38/0074C04B38/007
Inventor 宋锡滨吴艳增崔明山霍希云丁运刚张同元
Owner SHANDONG SINOCERA FUNCTIONAL MATERIAL CO LTD
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