Continuous casting system capable of obtaining closed-cell foam aluminum with uniform bubble bodies

Abstract

The invention discloses a continuous casting system capable of obtaining closed-cell foam aluminum with uniform bubble bodies. The continuous casting system comprises a smelting furnace, a tundish, a continuous foaming furnace, a continuous casting mould and a continuous traction device, wherein the tundish is provided with a stirrer for preventing sedimentation of melt tackifying particles; the continuous foaming furnace is divided into a liquid storage chamber and a foaming chamber by a baffle; a guide hole for a melt in the liquid storage chamber to flow to the foaming chamber is formed in the lower part of the baffle; the liquid storage chamber is provided with a stirrer for maintaining the tackifying particles to be uniformly dispersed in the melt; the foaming chamber is provided with a venting pipe and an air-liquid mixing agitator capable of guaranteeing that the melt and air bubbles enter into the lower part and are fully mixed; and the continuous casting mould comprises a water cooled jacket and a graphite inner mould; and the continuous traction device is a traction roller. According to the continuous casting system, the closed-cell foam aluminum can be continuously cast, and the fluctuation of the liquid surface of the melt does not cause destruction of the uniformity of the bubble bodies.

Description

technical field [0001] The invention relates to a device for preparing closed-cell foam aluminum by gas injection and foaming, in particular to a continuous casting system capable of obtaining uniform foam closed-cell foam aluminum. Background technique [0002] Aluminum foam is a new type of porous metal material. Its light weight and high specific strength make it a potential structural material; its sound absorption, sound insulation, heat insulation, flame retardancy, shock absorption, impact energy absorption and electromagnetic shielding make it a Can be used as functional material. Therefore, in aviation, aerospace, transportation, electronics, military industry, chemical industry, environmental protection, energy, machinery, biology and other high-tech fields and general industrial fields, the application of foamed aluminum has received more and more attention. At present, the preparation methods of aluminum foam mainly include infiltration casting, powder metallur...

AI Technical Summary

Problems solved by technology

The infiltration casting method is generally used to manufacture through-hole foamed aluminum; the powder metallurgy method is not suitable for the production of foamed aluminum used in general industrial fields due to high production costs

The melt foaming process is simple, but the current direct melt foaming method has the following disadvantages: (1) The operation is difficult, as described in US.pat.3743353, TiH 2 When used as a foaming agent to prepare foamed aluminum, the stirring and foaming time should be controlled within 1 to 2 minutes

(2) It can only be operated intermittently. The method described in CN1320710A has improved the foreign patent, which greatly reduces the difficulty of foam aluminum operation, but this method belongs to gap operation; (3) When the control is improper, there is a certain thickness of foam at the bottom Solid body, and the distribution of foam in the foam is uneven; it is because of these shortcomings that the production cost of aluminum foam remains high, and it also limits the large-scale commercial application of aluminum foam

[0003] In order to solve the high production cost of interstitial foamed aluminum, US patent US.pat6984356B2 describes a continuous preparation method of foamed aluminum, but this patent cannot increase the viscosity of the melt online according to the required amount, and does not point out how to increase the viscosity according to the required amount. To adjust the foaming agent online to obtain aluminum foam products with different porosity

In order to solve the problems existing in the US patent US.pat6984356B2, the inventor of this patent declared the patent CN100422363C in 2006. This patent can realize the effective control of the on-line viscosity increase and foaming amount of the melt, but the defect of this patent is: it has The counterfeiting of negative pressure suction function stirring equipment is not cheap, and it is easy to fail at high temperature

Patent CN102312117A provides a method and equipment for continuous production of closed-cell aluminum foam by air blowing and foaming, but the patent has the following main problems: ①The structure of the liquid storage chamber and the foaming chamber described in the patent makes the aluminum foam product The performance is sensitive to the fluctuation of the melt liquid level. The amount of melt added to the liquid storage chamber should not be too much each time. The liquid level must be kept relatively stable to prepare a material with a basically uniform foam body; ②Due to the carbonization of the viscosifying material The density of silicon is 3.2g / cm 3 , while the density of aluminum melt is mostly 2.7g / cm 3 Below, it is difficult to avoid the occurrence of silicon carbide precipitation at the bottom of the foaming furnace. The bottom precipitation of silicon carbide will lead to a decrease in melt viscosity, and the final result will affect the foam uniformity of the aluminum foam material; ③ the mesh belt mentioned in the patent Pulling mode, it is easy to cause the surface of the aluminum foam material to be rough, and the defects of foam body deformation and inhomogeneity appear

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