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A rapid prototyping method for preparing porous ceramic green body

A molding method and technology for porous ceramics, which are applied in the field of ceramic green body molding, can solve the problems of small-sized thin-walled samples that have no obvious influence, inappropriate preparation of porous materials, and difficulty in drying.

Active Publication Date: 2022-01-04
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when using traditional freezing equipment for freeze molding, the ceramic slurry has the characteristic of forming ice crystals with gradient sizes along the temperature gradient, which has no obvious effect on small-sized thin-walled samples
However, for samples with large size and complex shape, even in the low temperature environment of liquid nitrogen, there will be a temperature gradient inside and outside the sample, resulting in uneven structure and properties of the sample
In addition, when freeze-drying, there is also the problem that the interior is not easy to dry for samples with large sizes and complex shapes.
Therefore, the existing technology still has certain deficiencies in the preparation of large-scale and complex shape samples.
Traditional spray molding can finely control the morphology of materials, especially the preparation of materials with uniform morphology and gradient composition, but it is not suitable for the preparation of porous materials

Method used

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  • A rapid prototyping method for preparing porous ceramic green body
  • A rapid prototyping method for preparing porous ceramic green body
  • A rapid prototyping method for preparing porous ceramic green body

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1: will prepare the required stainless steel cylindrical mold (such as figure 2 As shown in (a), place it in a low-temperature freezer at -18°C for 24 hours; at the same time, prepare an alumina ceramic slurry with a solid content of 60 wt%: add weighed alumina to a 250 mL polyethylene grinding bottle 100 g, 5 g of sintering aid magnesium oxide, 1 g of potassium polyacrylate and 60.67 g of deionized water, and adding a certain proportion of alumina ball mill, ball milling and mixing reaction for 24 h. Take out the frozen mold and place it on a flat ground, and then spray the ceramic slurry on the surface of the frozen mold with a hand-held spraying equipment. The thickness of a single spray is 300 μm, and the spraying is repeated until the required thickness is obtained. Put the frozen mold and the sample frozen on its surface into a vacuum drying oven, first keep it at 5 °C and a vacuum of 10 Pa for 4 h, then raise the temperature of the sample to 50 °C, ke...

Embodiment 2

[0036] Embodiment 2: will prepare the required aluminum-based mold (such as image 3 (shown in (a)) placed in a low-temperature freezer at -80°C for 12 hours; at the same time, a silicon nitride ceramic slurry with a solid content of 50 wt% was prepared: in a 250 mL polyethylene grinding bottle, add the weighed nitrogen Silicon oxide 100 g, sintering aid magnesia 5 g, phosphate ester 1 g and deionized water 94 g, and a certain proportion of silicon nitride ball mills were added, and the ball mill was mixed for 12 h. Take out the frozen mold and place it on the flat ground, and then use the automatic spraying equipment to spray the ceramic slurry on the surface of the frozen mold. The thickness of a single spray is 100 μm, and the spraying is repeated until the required thickness is obtained. Put the frozen mold and the sample frozen on its surface into a vacuum drying oven, first keep it at 5 °C and a vacuum of 10 Pa for 4 h, then raise the temperature of the sample to 50 °C a...

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Abstract

The invention provides a rapid prototyping method for preparing a porous ceramic green body, comprising: placing the mold required for preparing the ceramic green body in a low-temperature freezer to freeze; adding ceramic powder and a dispersant to a solvent and making them uniformly dispersed , to obtain a mixed ceramic slurry; spray the ceramic slurry on the surface of the frozen mold, and after the ceramic slurry sprayed on the surface of the mold freezes rapidly, continue spraying until the required thickness is obtained; finish the frozen mold and the sample frozen on its surface is put into a vacuum drying oven, and then dried and shaped in a vacuum environment to obtain a ceramic green body. The invention can prepare porous ceramic blanks with uniform appearance, large size and complex shape.

Description

technical field [0001] The invention relates to the field of forming ceramic green bodies, in particular to a forming method for preparing porous ceramic green bodies. Background technique [0002] In the past ten years, the freeze-drying technology that freezes ceramic slurry and then vacuum-dries it has gradually attracted people's attention as a new technology for preparing porous ceramics. The main equipment includes freezing equipment and freeze-drying equipment (referred to as freeze-drying equipment). The green body prepared by this technology has the advantages of controllable microstructure of the finished product and good mechanical properties of the material, and can prepare porous ceramic parts with complex shapes. However, when using traditional freezing equipment for freeze molding, the ceramic slurry has the characteristic of forming ice crystals with gradient sizes along the temperature gradient, which has no obvious effect on small-sized thin-walled samples....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B28B1/00B28B1/24B28B11/24
CPCB28B1/007B28B1/24B28B11/243
Inventor 左开慧曾宇平夏咏锋姚冬旭尹金伟梁汉琴
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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