Preparation method of high-porosity Mn-Cu-based high-damping alloy with adjustable pore diameter and pore size

Abstract

The invention discloses a preparation method of a high-porosity Mn-Cu-based high-damping alloy with adjustable pore diameter and pore size. A powder metallurgy method based on the urea particle occupation pore forming comprises the following steps of mixing the particles, carrying out cold pressing forming, dissolving, drying, sintering and the like. The powder metallurgy method has the advantagesthat the problem of the traditional high-damping Mn-Cu alloy density is large is overcome, the Mn-Cu alloy damping performance can be effectively improved through the porosity and the high-density defects around the cavity, the powder metallurgy method is more likely to be applied to the wider application field in the future, in particular to the field of aerospace and the like, and has excellentdamping and noise reduction effects; the problem that the foaming temperature is high the pore size distribution is not uniform, and the process operation difficulty is large due to the conventionalmelt foaming method are effectively overcome, the Mn-Cu alloy high-damping porous material which is controllable in pore size, uniform in pore structure and controllable in shape can be efficiently prepared at a relatively low temperature; the Mn-Cu alloy high-damping porous material belongs to physical occupying pore forming, the preparation process is simple and easy to operate, time and energyare saved, the cost of expensive dies is not needed, and the Mn-Cu alloy high-damping porous material is suitable for large-scale industrial production.

Description

Technical field [0001] The invention relates to a manufacturing method of an ultra-light porous high-damping material, in particular to a manufacturing method of an ultra-light high-porosity Mn-Cu-based high-damping alloy with adjustable pore size and pore type. Background technique [0002] Mn-Cu series vibration damping alloy (twin type high damping alloy), its damping mechanism is due to the movement of the thermoelastic martensite phase transition twins or the movement of the parent phase and the martensite phase boundary to absorb vibration energy and produce high internal friction. The damping alloy has the advantages of high damping ability, good comprehensive performance, simple process, good thermal processing, cold processing and welding performance, and has a broad industrial application prospect. Especially M2052 damping alloy (Mn-20Cu-5Ni-2Fe, at%), which has good machinability and excellent damping performance (maximum internal friction value reaches 0.06), has attr...

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Problems solved by technology

[0004] However, the current methods of preparing metal foam, such as the melt foaming method, have always had problems such as high foaming temperature, different pore sizes, uneven distribution, and difficult process operations; the powder metallurgy foaming method is often used in some The metal foam preparation method has the advantages of simple equipment and process, uniform pore structure, easy adjustment of alloy composition, etc., and has been paid more and more attention by researchers.

However, conventional foaming agents such as carbonates, metal hydrides, etc., belong to the chemical foaming method, which mainly relies on the foaming agent to decompose and release gas at high temperature to form pores. The process is complex and the pore sizes and distributions are different. uniform

The heat treatment process parameters are not suitable, and the prepared samples either have low porosity or collapse, which seriously affects the microstructure and macroscopic properties of the material

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