In a dust-free workshop in Fengyang Economic Development Zone, Anhui Province, micron-sized silver powder is pouring out of the atomization equipment. These seemingly ordinary metal powders carry the hope of the 3D printing industry to overcome the safety pain points - they are magnesium alloys, but they will not burn easily.On June 26, 2025, according to the resource library, 3D printing metal powder manufacturer Zhongti New Materials announced that the first industrial mass-produced 3D printing flame-retardant magnesium alloy powder CNPC-AZX912 was officially launched. This innovative material with a ignition point of up to 620°C is expected to reduce the flammable and explosive safety risks of magnesium alloys in 3D printing applications.Magnesium alloy is currently the lightest metal structural material with a density of only 2/3 of that of aluminum alloy. It has higher specific strength and good shock absorption performance. It is known as the "21st century green engineering material" and is widely used in aerospace, automotive, medical and other fields. However, due to its high chemical activity, magnesium alloys are easy to burn or even explode in 3D printing, which has become a key problem restricting its industrial application.Zhongti New Materials told the resource library that the company not only retained the advantages of magnesium alloy in terms of lightweight and high specific strength through the optimization of material composition and surface technology, but also greatly reduced the risk of dust explosion, and the material is safer and more controllable during storage, transportation and printing.Zhongti New Materials' formula innovation:AZX912 magnesium alloy powder is mainly composed of magnesium (about 87%) and aluminum (about 9%), supplemented by trace alloying elements, to form high-melting-point intermetallic compounds in the magnesium matrix. These nano-scale particles are evenly dispersed, acting as a "fire barrier" and significantly improving the flame retardant effect.At the same time, AZX912 is prepared using the independently developed ultra-high-speed plasma rotating electrode atomization technology, with a powder sphericity of more than 92%, very few satellite balls, and a particle size controlled at 30-90μm, which can be customized according to different 3D printing processes and product requirements.In addition, the Fire and Explosion Prevention Laboratory of Northeastern University also issued an authoritative test report (No.: 2025020700021), and the results showed that AZX912 exhibited excellent flame retardant properties.For actual users, this is not only a set of experimental data, but also an important guarantee for daily safety.The most direct benefit is that it has lower requirements for ambient oxygen concentration. The limit oxygen concentration (LOC) of AZX912 reaches 9.8%. In actual application, it only needs to control the system oxygen concentration within 6.8% (already including a 3% safety margin). Compared with traditional magnesium alloy materials, it has a larger operating space and is safer to use.More importantly, its dust cloud has a minimum ignition temperature of 620℃, which is insensitive to high-temperature hot surfaces, which means that in daily 3D printing operations, the equipment has lower requirements for explosion-proof electrical equipment, and can reach the T3 temperature group, which greatly reduces the difficulty of use.In terms of explosion risk, the maximum explosion pressure (PMAX) of AZX912 is only 0.58MPa, which is more than 40% lower than that of conventional magnesium alloy powder, and fully complies with the international standard of the EU ATEX explosion-proof directive for industrial dust Pmax less than 0.9MPa. In other words, when factories use this material, the safety bottom line is greatly improved and the actual risk is significantly reduced.However, Zhongti New Materials also reminds that although AZX912 has good body flame retardancy, the risk of explosion still exists. Related production equipment still needs to be equipped with dust collection, and reasonable explosion-proof and explosion-control measures, such as inerting, explosion venting, and explosion isolation, etc. Specific suggestions are as follows:Dust control: The dust concentration in the working environment should be controlled below 25 g/m³ (the lower explosion limit of magnesium alloy), and a dust concentration monitor should be equipped for real-time monitoring.Explosion-proof measures: Nitrogen inerting (oxygen concentration ≤6.8%) is preferred, or explosion venting and explosion isolation devices are installed. Electrical equipment must meet the explosion-proof requirements of the T3 temperature group (surface temperature ≤200℃).Electrostatic protection: The equipment should be effectively grounded, and the ambient humidity should be kept above 60% to prevent low-energy electrostatic discharge (MIE=10~20 mJ).Here, we also add one more point: magnesium will react with water and carbon dioxide, so when magnesium catches fire, you must not use water or carbon dioxide fire extinguishers, only dry powder fire extinguishers can be used, or directly cover with sand. Previously, serious accidents have occurred in the industry due to improper operation, and safety issues must be given enough attention.With the launch of the new 3D printing flame-retardant magnesium alloy powder CNPC-AZX912, this lightweight material is expected to open up a broader application space. It is not only suitable for test battery trays for new energy vehicles, but also for satellite brackets in aerospace, and will also become an important material for orthopedic implants in the medical field.In fact, as an important participant in 3D printing metal materials, Zhongti New Materials is accelerating its industrialization layout. By 2026, the company will build more than 50 powder production lines covering a variety of product types. Among them, for the titanium alloy market, the company has built three phases of new factory buildings, focusing on the large-scale production of 3D printing recycled titanium alloy powder. It is expected that by the end of 2025, the annual production capacity of Ti6Al4V alloy powder will reach 700 tons.
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