A kind of multifunctional foamed aluminum foaming agent and the method for using it to prepare foamed aluminum

Abstract

The invention provides a multifunctional foamed aluminum foaming agent and a method for preparing foamed aluminum by using the same. The multifunctional aluminum foamed foaming agent is copper sulfate or copper sulfate related derivatives or a mixture mainly including copper sulfate components. The method of preparing foamed aluminum with multifunctional foamed aluminum foaming agent is to add 0.5% to 20% of the mass of aluminum foamed aluminum raw material aluminum metal in the process of preparing foamed aluminum. The multifunctional foamed aluminum foamed agent can be applied It is used in the melt foaming method, powder metallurgy method and secondary foaming method of preparing aluminum foam. The foaming agent provided by the invention has good matching with the foaming temperature of the prepared aluminum foam, long sustained release time, good dispersibility, low cost, convenient use, and simultaneously has the functions of thickening and strengthening.

Description

technical field [0001] The invention belongs to the field of foamed aluminum materials, in particular to a multifunctional foamed aluminum foaming agent and a method for producing foamed aluminum by using the foaming agent. Background technique [0002] Aluminum foam is a new type of functional structural material with good heat insulation, energy absorption, sound absorption, shock absorption and other properties, and is widely used in aviation, aerospace, automobiles, construction, etc. Among the methods for preparing foamed aluminum, the melt foaming method is currently the most widely used method for industrially preparing foamed aluminum because of its simple preparation process, low production cost, and ease of industrial production. But as we all know, the most commonly used blowing agent TiH in the melt foaming method is 2 The initial decomposition temperature of aluminum foam is 433°C (decomposition peak is 611°C), which does not match the optimum foaming temperatu...

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Problems solved by technology

For example, for TiH 2 Oxidation treatment increases its decomposition temperature and prolongs the TiH 2 The sustained release time, but in the heating and holding process, the dehydrogenation process makes TiH 2 The hydrogen content is reduced, resulting in a decrease in the foaming ability of the blowing agent; for TiH 2 The surface is coated with a metal layer, which can effectively increase its decomposition temperature and prolong the sustained release time, but TiH 2 Its own properties have not changed. When the external high temperature is transmitted to the inside through the metal layer with good thermal conductivity, TiH 2 It will still decompose and release gas, if the metal coating is not dense enough, the gas will still overflow; use a foaming agent CaCO with a higher decomposition temperature 3 , whose decomposition temperature is 825°C, much higher than that of aluminum melt, in CaCO 3 At the decomposition temperature, the viscosity of the aluminum melt is very low, and it is difficult to retain the gas in the melt. At the same time, CaCO 3 The compatibility with aluminum is poor, the plasticity and toughness of the prepared foamed aluminum cell wall are poor, and the mechanical properties of the foamed aluminum are low

[0004] In addition, in the actual preparation process of aluminum foam, when using TiH 2 or modified TiH 2 When used as a foaming agent, the foaming agent often floats up during the foaming process, so that the bottom of the prepared aluminum foam cannot form a porous structure, resulting in waste of raw materials and increased costs.

[0005] Although the above-mentioned existing multiple foaming agent modification methods and new alternative foaming agents can solve some problems that the decomposition temperature of the foaming agent does not match the aluminum melt, the melt foaming method used in the industry to prepare aluminum foam is still Mainly use TiH 2 As a foaming agent, on the one hand, it is due to the reason of manufacturing cost, on the other hand, because the foaming agent prepared by the existing modification method and the new alternative foaming agent still generally have insufficient decomposition temperature matching, foaming One or more problems in the short release time of the agent, poor dispersion, complex modification methods, high modification cost, and foaming agents that are not conducive to the improvement of foamed aluminum properties need to be solved urgently, and most of the existing foaming agents only have foaming this function

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