Preparation method for industrial large-size foamed aluminum sandwich panel

Abstract

The invention discloses a preparation method for an industrial large-size foamed aluminum sandwich panel. The preparation method comprises the following steps that (1), aluminum powder / aluminum alloypowder, silicon powder, copper powder, magnesium powder, zinc-copper-nickel alloy powder and a foaming agent are mixed to obtain core mixed powder; (2), aluminum alloy pipes or plates are adopted, andthe pipes are flattened after being annealed and then rolled into a pipe-shaped cavity, or the sides of the two plates are sealed to form a pipe-shaped cavity; (3), the inner surface is pretreated; (4), the front end is sealed and then filled with the core mixed powder, and the tail end is sealed; (5), cold rolling is conducted; (6), sintering is conducted; (7), hot rolling is conducted; (8), edge cutting is conducted after heat treatment; and (9), air cooling is conducted after foaming treatment. According to the preparation method, low-temperature foaming is achieved, oversintering is avoided, and the physical properties of the panel are well kept.

Description

technical field [0001] The invention relates to the preparation of a layered composite material, in particular to a method for preparing an industrial large-size aluminum foam sandwich panel. Background technique [0002] As a new porous composite material, aluminum foam sandwich panel has many unique physical properties compared with traditional metal materials, such as light weight, high specific stiffness and specific strength, better energy absorption, noise reduction and electromagnetic Shielding properties, etc.; after special design and assembly, the material can be used as a material integrating structure and function, whether it is lightweight design in the aerospace and transportation fields, or applied to urban construction and engine partitions Such sound-absorbing structures, as well as the use of its energy-absorbing properties in vehicle anti-collision beams and armored vehicle chassis, have high application value and development prospects; in recent years, fo...

AI Technical Summary

Problems solved by technology

[0003] The main composite forms of the existing aluminum foam sandwich panel core layer and face plate are adhesive connection and metallurgical compounding; Although the operation is simple and economical, there are some obvious shortcomings, including its low interface bonding strength, easy aging and high temperature resistance, and the toxicity of the adhesive layer when it decomposes, which greatly limits its application field; therefore, the panel and The core layer adopts the method of metallurgical bonding, which has become the main development direction at present.

[0004] In order to achieve the metallurgical combination of the core layer and the panel, the researchers have continuously explored the production process; for example, in the patent CN104960270A, the aluminum foam sheet with appropriate density, porosity and thickness obtained by the melt foaming method is surface-treated, Place in parallel on a heating platform with a certain temperature. When the side contacting the heating platform reaches a certain temperature, press the other side to deform the heating side, and finally produce a skin layer similar to the panel, and then repeat the above for the other end operation to finally obtain a sandwich structure; although this method finally produces a foamed aluminum sandwich structure, the disadvantage is that the strength and surface quality of the obtained panel layer are poor, and it is easy to cause damage to the foamed aluminum structure during the compression process

[0005] In the invention patent CN106735245A, a method for preparing aluminum foam sandwich panels completely by powder metallurgy is disclosed, which is characterized in that the upper and lower panels also adopt the technical route of powder molding, according to the arrangement of panel powder-core layer powder-panel powder The method is evenly tiled, and the preform is formed by pressing with a press, and then heated and foamed to form a sandwich-like aluminum foam sandwich structure; although this method achieves a metallurgical bond between the face plate and the core layer powder, it is relatively difficult to operate , limited by equipment such as molds, it cannot be applied to the preparation of large-scale sandwich panels, and it is difficult to guarantee the thickness, flatness and strength of the panel layer

[0006] In the document "Aluminium Foam Sandwich Panels: Manufacture, Metallurgy and Applications", BanhartJ disclosed a method of preparing aluminum foam sandwich panels with a size of 1m×2m by powder metallurgy, which uses powder metallurgy; its technical route is First, the aluminum-based powder, foaming agent and some additives are fully mixed, and then pre-pressed into a compact core layer preform, and then the panel and the core layer are realized by selecting a suitable panel material and combining cold rolling and hot rolling. After a certain degree of mechanical interlocking, it is placed in a foaming furnace. After the prefabricated body is raised to a temperature range of 670-705 ° C and kept for a period of time, it is cooled to obtain a foamed aluminum sandwich composite material; the process of this method is relatively complicated, but It has strong practicability, and currently has high guiding significance in the production of industrialized aluminum foam sandwich panels; however, due to technical confidentiality and other reasons, in the preparation of large-scale interface metallurgy combined with foam aluminum sandwich panels, domestic scale has not yet been realized. chemical production

[0007] After careful analysis, it can be found that the preparation method of foamed aluminum sandwich panels announced by Banhart J et al. has certain deficiencies: under high temperature foaming (>630°C), almost all common aluminum-based alloy panels will be over-burned, which will inevitably lead to deterioration of panel performance. Seriously weakened, greatly reducing the practical application and use value of foamed aluminum sandwich panels as structural materials; Due to the limitation, the temperature gradient inside the product will inevitably increase, resulting in asynchronicity in the foaming process, and it is difficult to guarantee the stability and uniformity of cell growth; in addition, the short foaming time is not conducive to production control, resulting in poor product quality. Therefore, it is of great significance to develop large-scale interfacial metallurgically bonded aluminum foam sandwich panel materials suitable for industrial applications

Images