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A preparation method of porous metal/ceramic composites with controllable morphology and properties

A technology of ceramic composite materials and metal materials, which is applied in the field of preparation of porous metal/ceramic composite materials, can solve the problems of limited application range of porous ceramics, low temperature resistance density, poor corrosion resistance, etc., and achieves low cost, simple preparation method, simple craftsmanship

Active Publication Date: 2018-10-02
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Porous metal materials have the advantages of high strength and easy processing, and can be used as carriers for environmental protection fields such as exhaust gas filtration, but they have disadvantages such as poor corrosion resistance, high temperature resistance, and high density.
As a filter material, porous ceramics have the advantages of light weight, high temperature resistance, corrosion resistance, etc., but the application range of porous ceramics is limited due to the weakness of ceramic itself such as low toughness.

Method used

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  • A preparation method of porous metal/ceramic composites with controllable morphology and properties
  • A preparation method of porous metal/ceramic composites with controllable morphology and properties
  • A preparation method of porous metal/ceramic composites with controllable morphology and properties

Examples

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Embodiment 1

[0033] Example 1: In a 250mL polyethylene grinding bottle, add 18g of silicon carbide and 5g of copper powder weighed, 1g of a mixture of alumina and yttrium oxide as a sintering aid, 0.22g of potassium polyacrylate and 19.6g of deionized water, and Add a certain proportion of silicon carbide balls, ball mill and mix for 24 hours. The solid content of the slurry, the ratio of metal and ceramic, and the content of cell control agent are 55.3wt%, 27.8% and 0, respectively. After pouring the dispersed slurry into the mold, put it into the freezer of the refrigerator and freeze it at a low temperature of -10 to -20°C for about 2 hours. After the solid is formed, take the solid out of the mold and immediately put it into a vacuum dryer, first keep it at 5°C and a vacuum of 10Pa for 4h, then raise the temperature of the sample to 50°C, and keep it warm for about 4h, and finally get a porous Cu / SiC element Blank. The porous green compact was sintered at 1850°C for 1 h to obtain a p...

Embodiment 2

[0034] Example 2: In a 250mL polyethylene grinding bottle, weigh 18.5g of silicon nitride and 0.5g of Fe / Ni alloy, add 0.22g of ammonium polyacrylate and 110g of deionized water to 1g of the sintering aid aluminum oxide and yttrium oxide mixture, And add a certain proportion of silicon nitride balls, ball milling and mixing reaction for 24h. Add 8.33g of PVA aqueous solution with a concentration of 12wt%, mechanically stir for 0.5h, pour the dispersed slurry into the mold, put it into the freezer of the refrigerator and freeze it at a low temperature of -10~-20°C for about 8h. The solid content of the slurry, the ratio of metal and ceramic, and the content of pore control agent are 15.3wt%, 2.7% and 5.3%, respectively. After the solid is formed, take the solid out of the mold and immediately put it into a freeze dryer, first keep it at 10°C and a vacuum of 5Pa for 4h, then raise the temperature of the sample to 60°C, keep it for about 5h, and finally get a porous Fe / Ni / Si 3...

Embodiment 3

[0035] Example 3: In a 250 mL polyethylene mill bottle, weigh 18.5 g of alumina powder and 9.1 g of nickel powder, add 0.5 g of sodium polyacrylate and 80 g of PVA aqueous solution with a concentration of 12 wt %, and ball mill and mix for 24 hours. Add mechanical stirring for 0.5h, pour the dispersed slurry into the mold, put it into the freezer of the refrigerator and freeze it at a low temperature of -10~-20°C for about 12h. The solid content of the slurry, the ratio of metal and ceramic, and the content of pore control agent are 34.9wt%, 49.2% and 34.8%, respectively. After the solid is formed, the solid is taken out from the mold and immediately placed in a freeze dryer, first kept at 10°C and a vacuum of 10Pa for 5 hours, then the sample is heated to 60°C and kept for about 6 hours, and finally a porous green body is obtained. The freeze-dried porous green body was sintered at 1350 °C for 1 h to obtain porous Ni / Al 2 o 3 composite material.

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Abstract

The invention relates to a preparation method of a porous metal / ceramic composite material with controllable shape and performance. The preparation method comprises the following steps: uniformly mixing a metal material, ceramic powder and a dispersant and adding the mixture into a solvent; carrying out ball grinding to uniformly disperse the mixture to obtain mixed slurry; pouring and molding the mixed slurry; and carrying out low-temperature freezing at -200 DEG C to 0 DEGC; drying and molding in a vacuum environment to obtain a porous ceramic green body; and calcining the porous ceramic green body in a vacuum or inert atmosphere environment for 1-3 hours at 1350-1850 DEG C to obtain the porous metal / ceramic composite material. With the adoption of the preparation method provided by the invention, the material with a complicated structure, controllable hole shape and size and certain mechanical properties can be prepared, and the preparation method has the advantages that the materials with certain mechanical property are adopted, the cost is low, the process is simple and suitable for industrial large-scale production, so that the preparation method has a very good development prospect.

Description

technical field [0001] The invention relates to a preparation method of a porous metal / ceramic composite material with controllable appearance and performance, and belongs to the field of preparation of porous metal / ceramic composite materials. Background technique [0002] Porous metal materials have the advantages of high strength and easy processing, and can be used as carriers in environmental protection fields such as exhaust gas filtration, but they have disadvantages such as poor corrosion resistance, low temperature resistance, and high density. As a filter material, porous ceramics have the advantages of light weight, high temperature resistance, corrosion resistance, etc., but the application range of porous ceramics is limited due to the weakness of ceramics such as low toughness. The metal / ceramic composite material developed by dispersing the intermetallic compound in the ceramic matrix overcomes the inherent brittleness of the ceramic itself, and at the same ti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/11C22C1/08
CPCB22F3/1121
Inventor 左开慧曾宇平夏咏锋姚冬旭尹金伟梁汉琴
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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