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Gradient porous metal material and preparation method thereof

A metal material, gradient porous technology, applied in the field of metal material processing, to achieve the effect of easy industrial production, low cost, and simple preparation process

Active Publication Date: 2021-06-01
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, laser surface treatment has been widely used in laser glazing, laser remelting, laser alloying, laser coating and laser cleaning, etc. However, the research and application of gradient porous metal materials prepared by laser surface treatment have not been reported yet.

Method used

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  • Gradient porous metal material and preparation method thereof
  • Gradient porous metal material and preparation method thereof
  • Gradient porous metal material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Preparation of gradient porous K438 superalloy:

[0035] Step 1, respectively weigh 100g of K438 superalloy powder and 6.3g of PMMA powder, put the above mixed powder into a ball mill tank for ball milling, the ball milling time is 6 hours, the ball mill speed is 200rpm, and the ball-to-material ratio is 2:1;

[0036] Step 2, pressing the powder after ball milling into a cylindrical powder compact with a diameter of 28mm and a height of 28mm, the pressure acting on the compact is 100MPa, and the holding time is 5 minutes;

[0037] Step 3, put the powder compact into an atmosphere furnace, heat the temperature to 400°C at a rate of 10°C / min, and then keep it at 400°C for 2 hours to remove the pore-forming agent in the powder compact;

[0038] Step 4: After the holding time is over, continue heating to 1000°C at a rate of 10°C / min, then heat the green compact from 1000°C to 1200°C at a rate of 5°C / min, and then hold at 1200°C for 1 hour Carry out sintering; after the hea...

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Abstract

The invention discloses a gradient porous metal material and a preparation method thereof, and relates to the field of metal material processing. The aperture and porosity of the gradient porous metal material are gradually reduced from the material surface to the central area, the aperture size is 1-200 microns, and the porosity is 20-60%. The preparation method comprises the following steps that metal powder and a pore-forming agent are put into a ball mill according to a certain ratio for ball-milling and mixing to obtain uniformly mixed powder, the obtained powder is put into a mold and is pressed into a precast block by using a press, then the precast block is put into a sintering furnace for sintering, then the sintered precast block is polished by using abrasive paper for ultrasonic cleaning, and then the processed precast block is put into a vacuum drying oven for drying, and finally laser surface treatment is carried out. The method for inducing high-temperature expansion of pores in the surface of the porous material through laser heating is used for preparing the porous structure material with the pore diameter and the porosity in gradient distribution from the surface to the interior of the material, and the gradient porous metal material has the characteristics of being simple in preparation process, low in cost, easy to industrially produce and the like.

Description

technical field [0001] The invention relates to the field of metal material processing, in particular to a gradient porous metal material and a preparation method thereof. Background technique [0002] Porous metal materials have the characteristics of low density, high specific surface area, high specific strength and high energy absorption rate, and are widely used in aerospace, electronic information, biomedicine and other fields. Pore ​​size and distribution directly affect the performance of porous metals. When the pore structure presents a continuous gradient change along a certain direction, the performance of the porous material also presents an asymmetric gradient change, thus exhibiting performance characteristics that other uniform porous materials do not have. etc. have extremely important application value. [0003] At present, the preparation methods of gradient porous materials mainly include powder layer laying and pressing sintering method, spraying or bru...

Claims

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Application Information

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IPC IPC(8): B22F3/11B22F3/24
CPCB22F3/1109B22F3/24B22F2003/247B22F2003/248Y02P10/25
Inventor 梁加淼王俊
Owner SHANGHAI JIAO TONG UNIV
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