Preparation method of foamed aluminum sound-absorbing and sound-insulating composite material

Abstract

The invention relates to a preparation method of a foamed aluminum sound-absorbing and sound-insulating composite material. The method comprises the following steps: cutting pure aluminum ingots into aluminum blocks, putting them into crucibles, raising the temperature to 700°C-740°C and melting them to obtain aluminum melts; agent, then add basalt chopped fibers with 3-5% of the mass of the aluminum melt, stir evenly, then add the foaming agent titanium hydride, keep warm for 1-2 minutes after stirring; cool until the foamed aluminum is solidified and formed, and finally get the foamed aluminum sound-absorbing and sound-insulating composite material. The invention only needs to foam the industrial pure aluminum melt once through the melt foaming method to obtain fiber closures with good sound absorption and sound insulation performance, wide size range, high strength, low density, good flame retardancy and high weather resistance. Cellular aluminum foam composite.

Description

technical field [0001] The technical solution of the invention relates to the manufacture of closed-pore alloys, in particular to a preparation method of foamed aluminum sound-absorbing and sound-insulating composite materials. Background technique [0002] With the development of society, people's requirements for living environment are getting higher and higher. With the rapid development of urbanization and industrialization in our country, noise has become a major source of pollution affecting people's lives, and noise has a serious impact on work and study, and can cause hearing and other diseases. Based on the above conditions, a material with good sound absorption and sound insulation performance, wide size range, high strength, low density, good flame retardancy and high weather resistance is required to meet various requirements. [0003] Aluminum foam is a heterogeneous material composed of aluminum base metal and pores accounting for more than 70% of the volume, ...

AI Technical Summary

Problems solved by technology

[0004] Among the existing research results, CN201910238U discloses a method for preparing high-efficiency sound-absorbing and sound-insulating foam aluminum panels. In this method, the closed-cell foam is opened into open-cell foam aluminum through a hydraulic press. This method requires secondary pressure processing. Cracks are prone to occur on the hole wall, resulting in poor mechanical properties of the foamed aluminum plate

CN103352135A discloses a method for preparing sound-absorbing and sound-insulating open-cell foamed aluminum by using the percolation method. Due to the limitation of the preparation method, the size range of the prepared foamed aluminum product is small, especially in terms of thickness, and its mechanical properties and sound-absorbing and sound-insulating properties are relatively low. Difference

CN105383113A discloses a foamed aluminum heat-insulating and noise-reducing metal plate for the front cover of a car. The method is to bond the foamed aluminum plate, the heat-insulating layer and the foamed plastic together through glue. The disadvantage is that the material is bonded to the At the same time, once subjected to a large bending stress, the bonding is easy to crack, the sound absorption and sound insulation performance will be greatly reduced, and the adhesive is prone to aging and failure and has poor heat resistance

However, basalt fibers are easy to agglomerate to form fiber clusters in the aluminum melt, which affects the performance of the prepared aluminum foam composites, and the elongation of the fibers in the pores of the aluminum foam is difficult to control

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