Porous material with central symmetry structure and method for preparing the same

A porous material and centrosymmetric technology, which is applied to home appliances, ceramic products, and other home appliances, can solve the problems of random distribution of pore structure and strength, and achieve the solution of random distribution of pore structure and low strength. The preparation method is simple and easy to operate. Good mechanical properties and stability

Active Publication Date: 2015-09-30
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Another object of the present invention is to provide the preparation method of the above-mentioned porous material, which solves the problems of random distribution of pore structure and low strength of the porous material prepared in the prior art

Method used

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  • Porous material with central symmetry structure and method for preparing the same
  • Porous material with central symmetry structure and method for preparing the same
  • Porous material with central symmetry structure and method for preparing the same

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preparation example Construction

[0031] The present invention also provides a method for preparing the above-mentioned porous material with a centrosymmetric structure, comprising the following steps:

[0032] Step 1, weigh ceramic powder, water, dispersant and binder, the volume ratio of ceramic powder and water is 1:1.5~1:4, the mass of dispersant accounts for 2%~of the total mass of ceramic powder and water 8%, the mass of the binder accounts for 1% to 4% of the total mass of the ceramic powder and water;

[0033] Step 2: Add dispersant and binder into water, mix well, then add ceramic powder, mix well to obtain raw material liquid; use zirconia balls or alumina balls as ball milling medium, ball mill in polyethylene ball mill bottle for 24 hours to make it uniform Disperse to obtain slurry;

[0034] Step 3, inject the slurry into a cylindrical mold whose sides and bottom are heat transfer materials, and then place the mold on the freezer shelf of the freeze dryer to freeze for 2-4 hours, and the freezing...

Embodiment 1

[0042] In 60g of distilled water, add 3.96g of sodium polyacrylate and 1.98g of carboxymethyl cellulose in sequence, mix evenly, and then add 138.40g of Al 2 o 3 Powder, Al 2 o 3 The volume ratio of powder and distilled water is 4:6, using zirconia balls as the ball milling medium, ball milling in a polyethylene ball mill bottle for 24 hours to make it uniformly dispersed, and the volume concentration of 40% Al 2 o 3 slurry; Al 2 o 3 The slurry is injected into a cylindrical mold with copper sides and bottom, a radius of 16mm, and a height of 48mm, and then injected with Al 2 o 3 The bottom of the slurry mold was placed on a freezing shelf at -30°C for freezing; Al 2 o 3 After the slurry was completely frozen, it was taken out, and placed in an environment with a pressure of 0Pa and dried under low pressure to obtain Al 2 o 3 Porous material preform; the Al 2 o 3 Al 2 o 3 porous material.

[0043] figure 2 is the Al prepared in Example 1 of the present inventi...

Embodiment 2

[0045] Add 5.74g sodium methylene dinaphthalene sulfonate and 2.87g polyvinyl alcohol in sequence to 70g water, mix evenly, then add 73.62g HA powder, the volume ratio of HA powder and distilled water is 3:7, use zirconia balls as the ball milling medium , ball milled in a polyethylene ball mill bottle for 24h to make it evenly dispersed, to obtain a HA slurry with a volume concentration of 30%; inject the HA slurry into a cylindrical mold with silver sides and bottom surfaces, a radius of 8mm, and a height of 24mm, and then Place the bottom of the mold injected with HA slurry on a freezing shelf at -40°C for freezing; take out the HA slurry after it is completely frozen, and place it in an environment with a pressure of 600Pa to dry it under low pressure to obtain a preformed body of HA porous material; The preform is sintered at 1250°C in an air atmosphere to obtain a HA porous material.

[0046] Each channel of the HA porous material points to the center and is evenly distr...

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Abstract

The invention discloses a porous material with a central symmetry structure. Layered holes of the porous material are of a central symmetry oriented structure along the radial cross section. A method for preparing the porous material with the central symmetry structure comprises adding a dispersing agent and adhesives in water, adding ceramic powder after uniform mixing, using a zirconia ball or an alumina ball as a ball milling medium to perform ball milling, obtaining slurry with the volume concentration of 20%-40%; injecting the slurry in a cylindrical die with the side face and the bottom surface provided with a heat transfer material, placing the die on a freezing partition plate of a freezing dryer to freeze the slurry for 2-4 h, causing the freezing temperature to be -50 DEG C to -30 DEG C; completely freezing the slurry and then taking the slurry out of the die, placing the frozen slurry in the environment with the pressure of 0-600 Pa to perform low pressure drying for 20-24 h, so as to obtain a porous material prefabricated body; and finally sintering the porous material prefabricated body in the air or in the atmosphere of vacuum at 800-1700 DEG C for 2-3 h to obtain the porous material.

Description

technical field [0001] The invention belongs to the technical field of preparation of porous materials, relates to a porous material with a centrosymmetric structure, and also relates to a preparation method of the porous material with a centrosymmetric structure. Background technique [0002] Porous material is a material with a network structure composed of interpenetrating or closed pores. Porous materials are generally used in gas and liquid filtration, purification and separation, catalyst carriers, advanced thermal insulation materials, biological Implantable materials, sound-absorbing and shock-absorbing materials and sensor materials and many other fields. At present, the methods for preparing porous materials mainly include organic foam impregnation, adding pore-forming agents, sol-gel methods, and freeze-drying methods. However, the porous materials prepared by most of the preparation methods have random and irregular porous structures, and the strength is not hi...

Claims

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Application Information

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IPC IPC(8): C04B38/00C22C1/08C04B35/10C04B35/447C04B35/48
Inventor 汤玉斐邱沙赵康吴聪
Owner XIAN UNIV OF TECH
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