A kind of gradient porous metal material and its preparation method

Abstract

The invention discloses a gradient porous metal material and a preparation method thereof, and relates to the field of metal material processing. The pore diameter and porosity of the gradient porous metal material gradually decrease from the surface of the material to the central area, and the pore size is 1-200 microns. The porosity is 20%‑60%. Its preparation method is to put a certain ratio of metal powder and pore-forming agent into a ball mill for ball milling and mixing to obtain a uniformly mixed powder and put it into a mold, press it into a prefabricated block with a press, and then put it into a sintering furnace for sintering , and then polished with sandpaper for ultrasonic cleaning, then placed in a vacuum drying oven for drying, and finally laser surface treatment. The invention uses laser heating to induce high-temperature expansion of pores on the surface of porous materials to prepare a porous structure material with a gradient distribution of pore diameter and porosity from the surface to the inside of the material, which has the characteristics of simple preparation process, low cost, and easy industrial production.

Description

A kind of gradient porous metal material and preparation method thereof technical field [0001] The present invention relates to the field of metal material processing, in particular to a gradient porous metal material and a preparation method thereof. Background technique Porous metal materials have the characteristics of low density, high specific surface area, high specific strength, and high energy absorption rate. It has a wide range of applications in aerospace, electronic information, biomedicine and other fields. Pore ​​size and distribution directly affect the properties of porous metals can. When the pore structure exhibits a continuous gradient along a certain direction, the properties of the porous material also exhibit an asymmetric gradient changes, thereby exhibiting performance characteristics that other uniform porous materials do not have, in heat transfer, filtration and human bone materials, etc. It has extremely important application value. At...

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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.

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