Porous magnesium alloy with through hole structure prepared by reactive sintering powder metallurgy method and preparation method of porous magnesium alloy

Abstract

The invention discloses a porous magnesium alloy with a through hole structure prepared by a reactive sintering powder metallurgy method and a preparation method of the porous magnesium alloy. Magnesium powder and alloy element powder are used as raw materials, urea particles or soluble salt particles are used as filler particles, and the porous magnesium alloy with the through hole structure is prepared by adopting the reactive sintering powder metallurgy method. The specific process method comprises the following steps of firstly, uniformly mixing the magnesium powder, alloy element powder and the urea particles or soluble salt particles serving as a pore-forming agent according to the expected porosity, then carrying out cold pressing on the mixture to prepare a green body, putting the green body into water or a weakly alkaline NaOH solution to remove filler particles, and then enabling the magnesium and alloy elements to react at a lower temperature to form metallurgical bonding to prepare the porous magnesium alloy with certain strength, enabling the preparation process to be safer and more energy-saving by the low sintering temperature, and meanwhile, improving the mechanical property of the porous magnesium alloy through solid solution aging treatment.

Description

technical field [0001] The invention belongs to the field of preparation of foam metal materials, and in particular relates to a reaction sintering powder metallurgy method for preparing a porous magnesium alloy with a through-hole structure and a preparation method thereof. Background technique [0002] The porous metal material with millimeter-scale pores and through-hole structure is an ultra-light metal material with excellent performance. It has a unique structure and performance, and has excellent physical, mechanical, thermal, electrical and acoustic properties. Lightweight and multifunctional, it has broad application prospects in industrial and national defense technology fields such as automobiles, aviation, transportation, and architectural decoration. [0003] Magnesium and magnesium alloys are currently the lightest metal materials in structural materials. Compared with aluminum, they have low density, good electromagnetic shielding performance, and good biocomp...

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Problems solved by technology

The problem of this method is: (1) soluble inorganic salt can adopt sodium chloride and magnesium sulfate etc.

However, it should be noted that the equilibrium potential of magnesium is low. When removing inorganic salts, chloride ions or sulfate ions will corrode the magnesium alloy substrate.

(2) Magnesium melt is active at high temperature, such as flammable, explosive when exposed to water, etc.

(4) The porosity of the prepared porous magnesium alloy depends on the packing density of the inorganic salt particles, so the porosity range of the prepared porous magnesium alloy is narrow

But this method also has the following problems: (1) the preparation of the gypsum model takes a long time, and the prepared gypsum model may have defects such as cracks and collapse; (2) when the magnesium alloy melt is poured, the gypsum model needs to be preheated and Vacuuming and other links, the process engineering is complicated; (3) Due to the surface tension, the pores of the plaster model must be large enough, otherwise the magnesium alloy melt is difficult to fill the entire network

However, in the preparation process, in order to establish the metallurgical bond between magnesium particles, low-temperature sintering at 400°C for 1 to 1.5 hours, and then sintering at 630°C for 2 to 3 hours in an inert atmosphere makes the preparation process of porous magnesium relatively complicated. , the lack of high requirements for equipment

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