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Directional solidification apparatus for preparation of porous ceramics based on ice template method and preparation method thereof

A porous ceramic, directional solidification technology, used in ceramic products, other household appliances, household appliances, etc., can solve the problem that the cooling rate cannot reach a linear change in the cooling rate, the control of the pore shape of porous ceramics is limited, and it is difficult to control the growth of ice crystals, etc. problem, to achieve the effect of uniform temperature field, fast cooling rate and good mechanical properties

Inactive Publication Date: 2016-05-04
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above studies are all based on a single control of the temperature field, and the control accuracy is limited. For example, the high cooling rate cannot achieve a linear change, and the low cooling rate changes smoothly. It is difficult to control the growth of ice crystals, and the control of the pore shape of porous ceramics is limited.

Method used

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  • Directional solidification apparatus for preparation of porous ceramics based on ice template method and preparation method thereof
  • Directional solidification apparatus for preparation of porous ceramics based on ice template method and preparation method thereof
  • Directional solidification apparatus for preparation of porous ceramics based on ice template method and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1: refer to figure 2 , image 3 .

[0028] (1) Preparation of ceramic slurry: Weighing 30g of alumina powder, 0.3g of dispersant, 0.6g of binder PVA, and 70g of deionized water into a stirring container with an average particle size of 200nm respectively, and fully mix Stir for 24h to obtain a stable dispersed slurry;

[0029] (2) Pack the ceramic slurry into a closed container connected to a vacuum pump for degassing, and get rid of the air bubbles generated during the stirring process of the slurry;

[0030] (3) Inject the ceramic slurry into the mold, then place the mold in the directional solidification device, start the power supply, then turn on the low-temperature cycle machine, turn on the water pump cold cycle, set the cooling temperature to -30°C, then start the constant temperature tank, open Water pump heat cycle, set the heating temperature to 80°C, adjust the heat-conducting spiral copper tube and the mold to the set position, start the contro...

Embodiment 2

[0034] Embodiment 2: as Figure 4 shown.

[0035] (1) Preparation of ceramic slurry: Weighing 75g of alumina powder with an average particle diameter of 200nm, 0.75g of dispersant, 1.5g of binder PVA, and 75g of deionized water into a stirring container, fully mixed Stir for 24h to obtain a stable dispersed slurry;

[0036] (2) Pack the ceramic slurry into a closed container connected to a vacuum pump for degassing, and get rid of the air bubbles generated during the stirring process of the slurry;

[0037] (3) Inject the ceramic slurry into the mold, then place the mold in the directional solidification device, start the power supply, then turn on the low temperature cycle machine, turn on the water pump cold cycle, set the cooling temperature to -30°C, and then start the constant temperature bath , turn on the heat cycle of the water pump, set the heating temperature to 80°C, adjust the heat-conducting spiral copper tube and the mold to the set position, and finally start ...

Embodiment 3

[0041] Embodiment 3: as Figure 5 shown.

[0042] (1) Preparation of ceramic slurry: Weigh 70g of alumina powder with a particle size of 200nm, 0.7g of dispersant, 1.4g of binder PVA, and 30g of deionized water into a stirring container, fully mix and stir 24h, obtain the slurry of stable dispersion;

[0043] (2) Pack the ceramic slurry into a closed container connected to a vacuum pump for degassing, and get rid of the air bubbles generated during the stirring process of the slurry;

[0044] (3) Inject the ceramic slurry into the mold, then place the mold in the directional solidification device, start the power supply, then turn on the low-temperature cycle machine, turn on the water pump cold cycle, set the cooling temperature to -30°C, then start the constant temperature tank, open Water pump heat cycle, set the heating temperature to 80°C, adjust the heat-conducting spiral copper tube and the mold to the set position, and finally start the control motor to adjust the se...

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Abstract

The invention discloses a directional solidification apparatus for preparation of porous ceramics based on an ice template method and a preparation method thereof. The directional solidification apparatus comprises a servo mechanism, a motor, a low temperature circulator, a constant temperature bath and a die. A refrigeration mode with refrigeration at one end and heating at the other end is used for generating a uniform temperature field, the motor and the servo mechanism are controlled for providing a solidification rate which is higher than 500 [mu]m / s, so that a better microscopic structure of the product is provided with better mechanical properties. Two independent technological parameters including temperature gradient and withdrawal rate are regulated separately, so that solidification process of a ceramic slurry is controlled, the regulation and control scope of the withdrawal rate is wide, and the regulated scope is 1-3000 [mu]m / s. A more uniform temperature field is generated by using the high-speed directional solidification method, the cooling rate is higher, the dimension of ice crystal with orientated growth is more uniform, and the porous ceramics with an oriented structure is obtained; form, structure and porosity of the prepared oriented porous ceramic pores are accurately controlled.

Description

technical field [0001] The invention belongs to the technical field of ceramic material preparation, and in particular relates to a directional solidification device and method for preparing porous ceramics based on an ice template method. Background technique [0002] Due to the combination of the characteristics of both porous materials and ceramic materials, porous ceramics have high permeability, high temperature resistance, corrosion resistance, low thermal conductivity and good mechanical properties. At present, there are many methods for preparing porous ceramics, such as adding pore-forming agents, organic foam impregnation, sol-gel methods, and biomimetic synthesis methods, etc., but these methods have certain limitations, such as various processes and difficult control of pore structure. , causing environmental pollution, etc. The ice-template method is a relatively simple, widely used, green and environmentally friendly preparation process, which has attracted th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/00
CPCC04B38/00
Inventor 申洁楠王理林王志军李俊杰王锦程
Owner NORTHWESTERN POLYTECHNICAL UNIV
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