A kind of preparation method of large-scale ceramic biscuit

A ceramic green body and large-size technology, which is applied in the field of preparation of large-size ceramic green bodies, to achieve the effects of simple preparation process, increased cross-linking degree, reduced shrinkage and cracking

Active Publication Date: 2016-08-24
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention aims to overcome the shortcomings of the existing large-size ceramic green body preparation method, and the invention provides a large-size ceramic green body preparation method

Method used

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  • A kind of preparation method of large-scale ceramic biscuit
  • A kind of preparation method of large-scale ceramic biscuit
  • A kind of preparation method of large-scale ceramic biscuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Example 1: Preparation of an alumina biscuit with a solid content of 56vol% and a size of 400mm×50mm×10mm from a one-component gel system

[0049] The alumina ceramic powder used is produced by Sumitomo Chemical Co., Ltd., Japan, with an average particle size of about 0.45 μm;

[0050] Add 1.68g of cis-butene polymer with long and short chains into 110g of deionized water, mix and dissolve in water for 10min, then add 560g of alumina ceramic powder, mix and ball mill with a planetary ball mill for 30min, after mixing evenly, the obtained ceramic slurry is vacuum removed Inject the air into a plastic mold, seal it with a PVC film and put it in a 50°C constant temperature box for syneresis. After 24 hours of dehydration, take out the unsealed film, and put the ceramic green body gel into a constant temperature and humidity box (temperature: 40°C ; Humidity: 60%) and dry for 24 to 36 hours to obtain a good alumina ceramic body with a smooth surface. After testing, the ben...

Embodiment 2

[0054] Example 2: Preparation of ternary gel system Alumina biscuit with a size of 300mm×200mm×50mm Add 46.2ml of ammonium polyacrylate to 1.32kg of deionized water as a dispersant, add 6.71kg of alumina ceramic powder after mixing, and stir Ball mill mixing and ball milling for 60 minutes. After mixing evenly, add 98.3ml water-soluble epoxy resin SPE and continue ball milling for 10 minutes, so that SPE and ceramic slurry are fully mixed, then add 57.8ml 3,3'-diaminodipropylamine as a curing agent and stir for 5 minutes. The obtained ceramic slurry is vacuum-degassed and injected into a plastic mold, sealed with a PVC film and placed in a 40°C constant temperature box for syneresis. Dry in a constant humidity box (temperature: 40°C; humidity: 60%) for 48 to 60 hours to obtain a smooth and intact alumina ceramic body;

[0055] Figure 5 It is the photo of the green body after dehydration and drying obtained in Example 2 of the present invention, and the sample is complete wit...

Embodiment 3

[0056] Example 3: A zirconia green body with a syneresis size of 600mm×320mm×60mm in a one-component gel system was added to 14.4kg of deionized water to add 187.2g of a maleic butene polymer with a combination of long and short chains, mixed with water for 10 minutes, and then added 103.8kg Zirconia ceramic powder was mixed and milled for 60 minutes with a stirring ball mill. After mixing evenly, the obtained ceramic slurry was degassed in a vacuum and poured into a plastic mold. After sealing it with a PVC film, it was placed in a thermostat at 40°C for syneresis and dehydration for 96 Hours later, the film can be removed for the next step of drying;

[0057] Figure 6 It is a photograph of the ceramic green body gel in Example 3 of the present invention during the dehydration process, and a water layer is formed on the surface of the ceramic green body gel.

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Abstract

The invention provides a method for preparing a large-size ceramic biscuit. The method includes the steps that firstly, preprocessed ceramic slurry with uniformly scattered gel systems is injected into a forming die to undergo in-situ solidification to obtain ceramic biscuit gel, the forming die is sealed so that the ceramic biscuit gel can be desolventized at the temperature of 30-80 DEG C and shrinks for twenty hours, and after seven days, drying processing is carried out and the large-size ceramic biscuit is obtained.

Description

technical field [0001] The invention relates to a molding method of a ceramic green body, in particular to a preparation method of a large-size ceramic green body. Background technique [0002] With the requirements of large-scale devices, complex shapes and high reliability, the molding technology of ceramic materials is also getting higher and higher. Compared with traditional dry pressing or grouting molding, the coagulation molding process developed by Oak Ridge National Laboratory has the following advantages in forming large-size ceramic green bodies: (1) The slurry is solidified in situ in the mold, The microstructure of the green body is uniform; (2) the green body has high strength and can be machined; (3) it is a quasi-net size molding technology, which can greatly reduce the amount of mechanical processing of ceramics; (4) the required tooling equipment is simple (5) It is very close to the traditional wet forming process (such as slip casting), suitable for indu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B28B11/24B28B1/14
CPCB28B1/14B28B11/243
Inventor 彭翔岛井骏臧孙怡周国红覃显鹏王士维
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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