Foaming agent and its preparation method

Abstract

The invention relates to a foaming agent and a preparation method thereof, and belongs to the technical field of preparation of foamed aluminum and foamed aluminum alloy. The foaming agent has a composition ratio of 20-25% by weight of quicklime, 30-40% by weight of coke, 10-15% by weight of potassium carbonate, and the balance is calcium sulfate. The steps of preparing foamed aluminum and foamed aluminum alloy with the foaming agent mentioned in the present invention: (1) melting process: put the aluminum alloy ingot into the crucible, heat it to 680-720 ° C and keep the temperature until it melts; (2) increase Viscosity process and foaming process: Add 1.5~3% foaming agent to the aluminum melt and stir for 5 minutes at a stirring speed of 1500~2000rpm to increase the viscosity of the melt and distribute the foaming agent in the aluminum melt (3) Heat preservation process: After the foaming agent is mixed evenly, keep the temperature at 680-720°C for 5-10 minutes. (4) Cooling process: After the aluminum foam is formed, it is naturally cooled in the air or forced to water. The foaming agent of the invention has low cost, is economical and effective, and can replace TiH2 foaming agents.

Description

[0001] [0002] Technical field: the invention belongs to the technical field of preparation of foamed aluminum and foamed aluminum alloy. [0003] Background technique: [0004] Aluminum foam is an aluminum-based metal material containing a large number of closed spaces made by foaming after adding additives to pure aluminum or aluminum alloy, and has both metal and bubble characteristics. It is characterized by low density, high impact absorption ability, high temperature resistance, strong fire performance, corrosion resistance, sound insulation and noise reduction, low thermal conductivity, high electromagnetic shielding, strong weather resistance, filtering ability, easy processing, easy installation, and forming accuracy High, can carry out surface coating. It can be widely used in transportation, construction machinery, electronic communication, aerospace, environmental protection and other fields. [0005] Since the middle of the 20th century, countries all over the...

AI Technical Summary

Problems solved by technology

[0006] (l) Most of the traditional crafts use TiH2 etc. as foaming agent and metal calcium as tackifier, and the fast decomposition speed of TiH2 foaming agent makes this method have harsh operating conditions and low yield;

[0007] (2) The use of expensive TiH2 foaming agents and metal calcium further increases the manufacturing cost of closed-cell aluminum foam; and the current intermittent operation greatly reduces production efficiency;

[0008] (3) The basic theoretical research is weak, and the research on the generation of defects such as cracks and cavities in the preparation process and the formation, evolution and stabilization mechanism of bubbles is not thorough enough, and it is difficult to form a stable preparation technology