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Preparation method for cordierite

A cordierite and prefabricated technology, applied in the field of ceramic material preparation, can solve the problems of high cost, low cordierite density, complicated preparation process, etc., and achieve the effects of low cost, suitable for large-scale industrial production, and uniform temperature

Inactive Publication Date: 2014-09-03
BYD CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention solves the technical problems of low cordierite density, complex preparation process and high cost in the prior art

Method used

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preparation example Construction

[0009] The invention provides a kind of preparation method of cordierite, comprises the following steps:

[0010] 1) Mix ceramic powder containing magnesia, alumina and quartz with sintering aids evenly, add polyvinyl alcohol aqueous solution, disperse evenly, and then isostatically press to form cordierite preforms;

[0011] 2) Microwave sintering the cordierite preform in step (1) to obtain cordierite; the microwave sintering temperature is 1100-1200°C.

[0012] According to the preparation method of the present invention, the ceramic powder and the sintering aid are firstly mixed evenly, then the aqueous solution of polyvinyl alcohol is added to disperse evenly to prepare ceramic slurry, and the cordierite preform is obtained by isostatic pressing, which can make the cordierite preform It has a certain shape and can ensure the minimization of the porosity of the cordierite preform; finally, through microwave sintering, and the temperature of microwave sintering is controlle...

Embodiment 1

[0024] (1) 33 parts by weight of magnesium oxide, 14 parts by weight of alumina, 53 parts by weight of quartz, 0.2 parts by weight of CaO and 0.3 parts by weight of TiO 2 After mixing, disperse in ethanol, electric stirring for 60min to mix evenly, heat and dry to volatilize ethanol.

[0025] (2) Add 5 parts by weight of 6wt% polyvinyl alcohol aqueous solution to the dried mixing system in step (1), stir to make the mixture uniform, granulate, then put it into an isostatic pressing mold, and perform molding on an isostatic pressing machine The preform was obtained, and the forming pressure was 400MPa.

[0026] (3) Put the preform in step (2) in a microwave oven and sinter at 1100° C. for 20 minutes to obtain the cordierite product S1.

Embodiment 2

[0028] (1) 13.5 parts by weight of alumina, 33.5 parts by weight of magnesium oxide, 53 parts by weight of quartz, 0.2 parts by weight of CaO and 0.3 parts by weight of TiO 2 After mixing, disperse in ethanol, electric stirring for 60min to mix evenly, heat and dry to volatilize ethanol.

[0029] (2) Add 5 parts by weight of 6wt% polyvinyl alcohol aqueous solution to the dried mixing system in step (1), stir to make the mixture uniform, granulate, then put it into an isostatic pressing mold, and perform molding on an isostatic pressing machine The preform was obtained, and the forming pressure was 400MPa.

[0030] (3) Put the preform in step (2) in a microwave oven and sinter at 1200° C. for 20 minutes to obtain the cordierite product S2.

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Abstract

The invention provides a preparation method for cordierite, which comprises the following steps of: 1) evenly mixing ceramic powder containing magnesium oxide, alumina and quartz with sintering aid, adding polyvinyl alcohol aqueous solution, and carrying out isostatic compaction after the polyvinyl alcohol aqueous solution is evenly dispersed to obtain a cordierite prefabricating product; and 2) carrying out microwave sintering to the cordierite prefabricating product obtained in step (1) to obtain the cordierite, wherein the microwave sintering temperature is 1100-1200 DEG C. With the preparation method provided by the invention, a cordierite product with high density can be obtained, and the preparation method has the advantages of simplified technology and low cost and is suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the field of preparation of ceramic materials, in particular to a preparation method of cordierite. Background technique [0002] Cordierite (2MgO-2Al 2 o 3 -5SiO 2 ) has an extremely low thermal expansion coefficient and high heat resistance, so it can be used as a thermal shock resistant material; in addition, cordierite also has extremely low dielectric loss characteristics. Therefore, cordierite ceramics can be widely used in various fields that have strict requirements on thermal shock and thermal expansion, such as ceramic kiln furniture, automobile exhaust gas treatment catalyst carrier, ceramic exchanger, electronic devices and other technical fields. [0003] At present, most of the processes for preparing cordierite use high-temperature solid-state reaction synthesis method, which has the advantages of simple production process and high production efficiency, but the synthesis temperature in this method is too high...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/195C04B35/622
Inventor 马国超向其军
Owner BYD CO LTD
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