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Porous ceramic product and preparation method thereof and solid-state refrigeration system

A technology for porous ceramics and solid-state refrigeration, applied in ceramic products, refrigerators, ceramic extrusion dies, etc., can solve the problems of increasing the difficulty of refrigeration machinery design and processing.

Pending Publication Date: 2022-02-22
THE HONG KONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this case, it is necessary to consider the consistency of the structure of the loading head directly in contact with the regenerator and the structure of the regenerator, that is, for each specific structure of the regenerator, it is necessary to design a pressure head that matches its structure. Head structure to ensure the flow of heat exchange medium, which will undoubtedly increase the difficulty of design and processing of refrigeration machinery

Method used

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  • Porous ceramic product and preparation method thereof and solid-state refrigeration system
  • Porous ceramic product and preparation method thereof and solid-state refrigeration system
  • Porous ceramic product and preparation method thereof and solid-state refrigeration system

Examples

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Embodiment 1

[0123] Provide zirconia ceramic disc (characteristic size 50mm, thickness 5mm, compressive strength 3000MPa, thermal conductivity 2W / (m·K), density 4g / cm 3 ), after drilling small holes with a twist drill, use a fine grinding wheel for 2 high-speed grinding to figure 1 The structure shown in (a), thereby obtaining a porous zirconia indenter, wherein the characteristic size (diameter) of the micropores is 2.0 mm, the distance between the pores is 8.0 mm, and the distance from the peripheral pores to the boundary is 2.5 mm. After testing (ISO standard), the compressive strength of the porous zirconia indenter of Example 1 is not less than 1600MPa.

Embodiment 2

[0125] Using 15μm-30μm alumina powder as raw material, through the matching mold (hard alloy steel mold), it is directly extruded under the extrusion pressure of 30MPa to have figure 1 (b) Prime embryo of the structure shown. Subsequently, the green embryo was hot-pressed and sintered at 2000° C. and 75MPa for 2.5 hours, and then cooled in the furnace to obtain the indenter of Example 2, in which the characteristic size (side length) of the micropores was 1.0 mm, the distance between the pores was 3.0 mm, and the porous alumina ceramics The characteristic size of the indenter is 40mm, the thickness is 3mm, the compressive strength is 3600MPa, the thermal conductivity is 10W / (m·K), and the density is 5g / cm3. The distance from the peripheral aperture to the boundary is 3.0 mm. After testing (ISO standard), the compressive strength of the porous zirconia indenter of Example 2 is not less than 1600MPa.

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Abstract

The invention relates to a porous ceramic product and a preparation method thereof and a solid-state refrigeration system. The porous ceramic product comprises sintered ceramic particles and has a plurality of pores through which a fluid medium passes, wherein in a cross-section of the product, the distance between the pores is at least one time the pore characteristic size, and the distance from each pore in the outermost periphery to the edge of the cross section is at least 1.2 times the pore characteristic size. The porous ceramic product can remarkably reduce on-way heat loss caused by direct contact of a heat exchange fluid medium and the porous ceramic product, and a product (such as a loading pressure head) form matched with the porous ceramic product does not need to be designed according to different heat regenerator structures.

Description

technical field [0001] The present invention relates to the field of high-strength performance materials, in particular to high-performance materials for refrigeration machinery, in particular to a high-strength porous ceramic product, a preparation method thereof and its application in a solid refrigeration system, such as for preparing a loading head Material. Background technique [0002] In order to solve the problems of aggravated ozone layer destruction and serious greenhouse effect caused by traditional vapor compression refrigeration technology, scholars from various countries have gradually carried out research on new refrigeration technology. Among them, the solid-state refrigeration technology based on the martensitic transformation and reverse transformation of shape memory alloys was proposed by British scientists in 2004 and has now been considered by the US Department of Energy as the most potential new refrigeration technology. [0003] In recent years, mech...

Claims

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Application Information

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IPC IPC(8): B28B3/20B28B3/26B28D1/14B24B1/00F25B23/00C04B38/00C04B35/10C04B35/622C04B35/645
CPCB28B3/20B28B3/26B28B3/269B28D1/14B28D1/146B24B1/00F25B23/00C04B38/0041C04B35/10C04B35/622C04B35/645C04B2235/96C04B2235/9607C04B38/0067
Inventor 周国安张龄匀张炯炯孙庆平
Owner THE HONG KONG UNIV OF SCI & TECH