Preparation method of open pore foamed aluminum capable of easily removing pore-forming agent

Abstract

The invention relates to a preparation method of an open pore foamed aluminum capable of easily removing a pore-forming agent. The preparation method of the open pore foamed aluminum comprises the following steps: firstly weighing ammonium bicarbonate and aluminite powder according to a volume ratio of (1-4) to 1, then uniformly mixing, subsequently adding absolute ethyl alcohol so as to improve the uniformity of mixed powder so as to obtain mixed powder sample, then pressing the mixed powder sample to obtain a cylindrical or strip-shaped pressed blank sample; putting the pressed blank sample in water bath for dipping to remove a spherical ammonium bicarbonate pore-forming agent, then drying the pressed blank sample in a drying oven; finally, sintering the pressed blank sample in vacuum, then cooling the pressed blank sample to the room temperature so as to obtain open pore foamed aluminum which is uniform in pore structure and controllable in porosity. The preparation method of the open pore foamed aluminum has the advantages that compared with the irregularly-shaped pore-forming agent, the foamed aluminum prepared by the spherical ammonium bicarbonate is capable of avoiding crack initiation to a great extent under the action of stress; the mechanical property of the foamed aluminum is improved; the pore-forming agent can be thoroughly removed; the corrosion of the residual pore-forming agent to an aluminum substrate can be avoided; the process period is shortened; the economic benefit is increased.

Description

technical field [0001] The invention relates to a method for preparing a through-hole foamed aluminum that is easy to remove a pore-forming agent, specifically a method for preparing a through-hole foamed aluminum with a uniform structure and excellent performance by improving the traditional sintering dissolution method by using an easier-to-remove pore-forming agent , belongs to the technical field of metal material processing. Background technique [0002] As a combination of pore phase and metal phase, porous metal foam exhibits special properties different from dense metals due to its special structure. It has light weight, large specific surface area, high specific strength, damping and vibration reduction, and good absorption. Acoustic sound insulation, energy absorption, filtering, electromagnetic shielding and other characteristics. According to the different pore structures, metal foam can be divided into two types: through-hole and closed-cell. Through pores mea...

AI Technical Summary

Problems solved by technology

In addition, since the melting point of NaCl is higher than the sintering temperature, and the solubility in water is low, the undissolved NaCl particles will corrode the matrix.

Although the strength and plasticity of the aluminum foam prepared by the sintering dissolution method are higher than those prepared by the sintering dissolution method, the process of dissolving NaCl for a long time by the sintering dissolution method will affect the compact, which will affect the bonding between aluminum particles in the next sintering process. The degree of compactness will easily cause holes and gaps between the aluminum powder particles, which will affect its strength.

Moreover, the sintering dissolution method still cannot avoid the matrix corrosion problem caused by the undissolved pore-forming agent NaCl.