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A kind of preparation method of cordierite ceramic material

A ceramic material, the technology of cordierite, which is applied in the field of preparation of cordierite ceramic materials, can solve the problem of small specific surface area of ​​the surface modification coating, and achieve the effect of increasing the specific surface area

Active Publication Date: 2021-01-15
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems and defects existing in the surface modification coating of existing cordierite honeycomb ceramics, the purpose of the present invention is to provide a preparation method of a novel cordierite ceramic material, which solves the problem of surface modification of existing cordierite honeycomb ceramics. The problem of small specific surface area of ​​the coating

Method used

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  • A kind of preparation method of cordierite ceramic material
  • A kind of preparation method of cordierite ceramic material
  • A kind of preparation method of cordierite ceramic material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Mix saturated aluminum nitrate solution and silica sol, and stir evenly with high intensity to obtain a silicon-aluminum mixed solution, wherein the amount of saturated aluminum nitrate solution and silica sol satisfies the molar ratio Al:Si=3:1; Add ammonia water dropwise to the mixed solution (NH 3 ·H 2 O) adjust to pH ≥ 9 to obtain a precursor sol, and then dry it at 110° C. to obtain a dry gel; mix and grind the above dry gel and sodium sulfate at a mass ratio of 1:2 to obtain a uniformly dispersed gel Rubber powder and sodium sulfate mixed powder; bury the cordierite ceramics to be modified in the mixed powder, keep warm at 1000°C for 2 hours and then cool naturally; place the treated cordierite ceramics to be modified in a boiling water bath Boil until the residual flux on the surface is completely dissolved, then cool, wash and dry to obtain surface-modified cordierite.

[0041] The flexural strength of cordierite ceramics modified by the above process has no s...

Embodiment 2

[0043] The difference between this example and Example 1 is that the reaction temperature between the cordierite ceramics to be modified and the mixed powder is 1000° C. for 4 hours. The surface morphology of cordierite honeycomb ceramics is similar to that of Example 1, and will not be repeated here in view of space.

Embodiment 3

[0045] The difference between this example and Example 1 is that the reaction temperature between the cordierite ceramic to be modified and the mixed powder is 1000° C. for 6 hours. The surface morphology of cordierite honeycomb ceramics is similar to that of Example 1.

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Abstract

The invention discloses a preparation method of a cordierite ceramic material. The preparation method comprises the following steps: mixing a saturated aluminum nitrate solution with a silica sol, andcarrying out drying to obtain a xerogel; burying cordierite ceramic to be modified into a mixture of the xerogel and a flux, carrying out heating, and then carrying out cooling; and removing residualflux on the surface of the cordierite to obtain surface modified cordierite, namely cordierite ceramics with mullite fibers growing on the surface. According to the cordierite ceramic modified by adopting the preparation method provided by the invention, only the physical appearance of the surface is changed, and on the basis of not changing the surface structure of the cordierite ceramic, mullite whiskers are directly grown in situ, so that the specific surface area of the cordierite is remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of inorganic material modification methods, and in particular relates to a preparation method of a cordierite ceramic material. Background technique [0002] Cordierite (2Al 2 o 3 2MgO 5SiO 2 ) Honeycomb ceramics are widely used as catalyst supports because of their unique properties (low thermal expansion coefficient and high thermal stability), and are suitable as automobile exhaust catalyst supports. At the same time, since the carrier for automobile exhaust catalyst requires a large specific surface area under the condition of sufficient strength, the two are indispensable. Smaller (generally less than 1m 2 / g). The specific surface area of ​​the carrier directly determines the number of active centers of the catalyst, thereby affecting the catalytic activity of the catalyst, so the specific surface area of ​​the cordierite honeycomb ceramic must be increased. At present, the surface modification m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/87C04B38/04
CPCC04B38/0006C04B38/04C04B41/009C04B41/5032C04B41/87C04B35/195C04B41/455C04B41/4596
Inventor 杜炜王伟
Owner CHANGAN UNIV