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
CN105541369AInactive Publication Date: 2016-05-04NORTHWESTERN POLYTECHNICAL UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NORTHWESTERN POLYTECHNICAL UNIV
Publication Date
2016-05-04
Estimated Expiration
Not applicable · inactive patent

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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.
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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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