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Method for preparing gradient porous material

A gradient porous, blank technology, applied in the field of preparing porous materials, can solve the problems of difficult control of pore size and porosity, difficult control of foaming process, complicated process, etc., and achieves control of pore size and porosity, pore size and porosity Easy and simple preparation process

Inactive Publication Date: 2010-08-25
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing gradient porous materials in order to solve the problems of complex process, high cost, difficult control of foaming process, and difficult control of pore size and porosity in the existing preparation methods of porous materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0008] Specific Embodiment 1: The method for preparing gradient porous materials in this embodiment is realized according to the following steps: 1. Mix the matrix powder and the porogen at a volume ratio of 1:1 to 10, and then add absolute ethanol to the mixture to prepare Suspension with a total mass concentration of the mixture of 2% to 50%; 2. Pour the suspension into the mold, and then carry out centrifugal deposition. The speed of the centrifuge is 500 to 5000r / min. After 3 minutes of centrifugal deposition, add the porogen into the mold Stop centrifugal deposition until the mold is filled; 3. The mold after centrifugal deposition is dried at 50°C for 5 hours, and the rough billet is taken out after demoulding, and then put into a graphite mold. -2 ~10 -3 Pa, the sintering temperature is 400~1500℃, and the sintering pressure is 2~100MPa under the conditions of sintering for 10min~3h to obtain the billet; 4. Remove the porogen in the billet to obtain the gradient porous m...

specific Embodiment approach 2

[0011] Embodiment 2: The difference between this embodiment and Embodiment 1 is that in Step 1, the matrix powder is mixed with the porogen at a volume ratio of 1:2-8. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0012] Embodiment 3: The difference between this embodiment and Embodiment 1 is that in Step 1, the matrix powder is mixed with the porogen at a volume ratio of 1:4-6. Other steps and parameters are the same as those in Embodiment 1.

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PUM

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Abstract

The invention discloses a method for preparing a gradient porous material, relates to a method for preparing a porous material, and solves the problem that the prior method for preparing the porous material has complex technique, high cost, hard control of foaming process, and hard control of aperture size and porosity factor. The method comprises the following steps: firstly, mixing matrix powder and pore-foaming agent, and then adding absolute ethyl alcohol into the mixture to prepare suspension; secondly, pouring the suspension into a mould, and then centrifugating and depositing the suspension; thirdly, after centrifugating and depositing the suspension, drying deposit, taking out rough blank after stripping, and putting the rough blank into a graphite mould to sinter to obtain blank;and fourthly, removing the pore-foaming agent in the blank to obtain the gradient porous material. The method has the advantages of simple preparation technique, low cost, gradually increased porosity factor along the radial direction from outside to inside, and easy control of the aperture size and the porosity factor.

Description

technical field [0001] The present invention relates to methods for preparing porous materials. Background technique [0002] Porous material is a new type of material with a large number of pores in its structure, integrated function and structure, and has dual properties of function and structure. It has excellent mechanical properties such as light weight, high specific strength, high specific stiffness, high strength and toughness, and high energy absorption. Performance, as well as special properties such as shock absorption, heat insulation, sound absorption, electromagnetic shielding, permeability, special optical properties, etc., is a multifunctional engineering material with excellent performance, widely used in metallurgical machinery, petrochemical, energy environmental protection, national defense Industries such as military industry, nuclear technology, aviation, electronics, medical materials and biopharmaceuticals. Porous materials can be divided into two ty...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F7/00C22C1/04B22F3/10C22C1/10
Inventor 曹国剑张一思刘东戎郭二军王丽萍康福伟黄永长
Owner HARBIN UNIV OF SCI & TECH