Aluminum extrusion is an efficient plastic processing technique that shapes round aluminum billets into parts or semi-finished products with specific shapes, dimensions, and mechanical properties by heating them to a critical temperature and extruding them through the die hole of a mold under the action of an extrusion press. However, aluminum tends to adhere to the surface of steel at high temperatures (above 450°C), presenting challenges in the extrusion process, especially in preventing billet adhesion to the extrusion head and mold.

Traditional mold release agents and lubricants, such as petroleum/graphite suspensions and acetylene, have their drawbacks. Graphite suspensions can cause surface contamination that is difficult to clean, are flammable at high temperatures, and may cause defects such as bubbles and holes on the surface of aluminum profiles, as well as the risk of electrical equipment short circuits. Acetylene, while producing soot that is an excellent mold release agent, has carcinogenic properties, flammable nature, and leaves black marks on the surface of aluminum profiles, requiring special safety measures and increasing production costs.

Hexagonal boron nitride (HBN), commonly known as "white graphite," is a hexagonal crystal composed of equal amounts of nitrogen and boron atoms. It is renowned for its excellent electrical insulation, lubrication, heat resistance, chemical inertness, and extremely low hardness, and is non-toxic and harmless. HBN's layered structure is similar to graphite, but its white powder form makes it safer and cleaner for applications.

As a high-temperature lubricating mold release agent, HBN shows great potential in the aluminum extrusion process. It can form an effective barrier between the press head and aluminum, and between the mold and aluminum, effectively preventing adhesion of aluminum, making the production process smoother. Moreover, the use of HBN can reduce the occurrence of mechanical lines, improve the surface quality of products, shorten mold cleaning and repair times, and extend the service life of molds. HBN mold release agents are not only suitable for aluminum extrusion but also widely used in other metal extrusion industries, metallurgical casting, and the glass industry, such as continuous casting steel separators, amorphous iron flow channels, and continuous casting of aluminum.

In summary, hexagonal boron nitride mold release agents, with their excellent performance and broad application prospects, provide an ideal solution for the aluminum extrusion process, helping to improve production efficiency and product quality while reducing production costs and safety risks.

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