Preparation method of Ni-Al alloy porous material with controllable structure

Abstract

A preparation method of an Ni-Al alloy porous material with a controllable structure comprises the steps of (1) using nickel-coated aluminum powder to serve as a raw material, wherein the nickel-coated aluminum powder is of solid or hollow particular structure, chemical element of an aluminum kernel is pure aluminum or aluminum alloy, and chemical element of a nickel shell is pure nickel or nickel-base alloy; and (2) enabling preparation processes to meet requirements of the following contents sequentially, firstly preparing material blanks, placing the nickel-coated aluminum powder in a die, exerting 0.1-200 MPa of pressure, enabling time to be 1s-100h, enabling temperature to be 10-600 DEG C, finally forming nickel-coated aluminum powder material blanks, then placing the nickel-coated aluminum powder material blanks in a high temperature furnace for conducting high temperature diffusion treatment for 1s-100h, enabling the temperature to be 600-1200 DEG C, and enabling pressure to be 0.1-200 MPa. The preparation method has the advantages of being even and controllable in pore size, controllable in pore opening and pore closing and the like, and the preparation method is applicable to large-scale production.

Description

technical field [0001] The invention relates to the preparation technology of metal porous materials, and in particular provides a method for preparing Ni-Al alloy porous materials with controllable structure. Background technique [0002] Metal porous material or metal foam is a new type of metal material with a certain pore structure, which can be divided into two types: closed cell and open cell according to the structure. Closed-cell metal foam can insulate heat, absorb impact energy and environmental noise, etc. , open-cell metal foams can be used for electrodes, dust removal, heat dissipation, and catalyst supports [see literature: D.T.Queheillalt, Y.Katsumura, H.N.G.Wadley. Synthesis of stochastic open cell Ni-based foams, Scripta Materialia, 50(2004) 313- 317]. Metal foam combines structure and function, and has a wide range of applications [see literature: L.-P.Lefebvre, J.Banhart, D.C.Dunand. -787]. In particular, foamed intermetallic compounds that can serve i...

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Problems solved by technology

where NiAl 3 The porosity can be as high as 80%, but the pore size difference between the edge and the core is as high as several times, and the mechanical properties are seriously affected

Wu Liang et al [Refer to literature: Wu Liang, He Yuehui, Dong Hongxing. Preparation of Ni-Al intermetallic compound porous materials, Powder Metallurgy Materials Science and Engineering, 14 (2009) 52-56] in the case of no foaming agent Porous Ni-Al intermetallic compounds with different porosities were successfully prepared. The pores included open pores and closed pores. The porosity and pore size increased with the increase of Al particle content and size, respectively, but the increase of Al particle content caused particle segregation and further The trend leading to pore segregation has also increased

It can be seen that the current controllability of the pores of porous Ni-Al intermetallic compounds is insufficient: the diffusion method can control the pores of foamed Ni-Al intermetallic compounds by adjusting the pore size and structure of the initial foamed nickel, but it is limited to open-cell foams. Ineffective for closed-cell foam materials; the reaction method can control the porosity to a certain extent, but the segregation of Ni and Al particles makes it difficult to precisely control the size and distribution of pores

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