On the basis of powder metallurgy, the research team has innovatively developed a "Pressure-free high energy absorption slurry steel foam sintering technology" that can prepare high-melting iron-based foam steel. It has successfully prepared a hole with a diameter of about 500µm to 5mm lightweight spherical closed-cell foam steel structural material. The main innovation of this technology is that it can prepare high-melting iron-based foam steel materials, and can control the porosity and pore size of foam steel, and its compressive strength is tens of times higher than that of aluminum foam; importantly, this technology breaks through traditional powder The size of the test body of the metallurgical method can be used to prepare large-size steel foam .

"Pressure-free high energy absorption slurry steel foam sintering technology" breaks through the traditional low-melting aluminum foam manufacturing process, and can produce porous steel foam mainly made of high-melting iron-based materials. This technology can control the porosity and pore size, and break through the limitation of the traditional powder metallurgy method that only small specimen can be made. It can complete the production of large-sized steel foam, and its compressive strength is dozens of times higher than that of aluminum foam. The anti-ballistic structure can absorb 60-70% of the kinetic energy of the armor-piercing projectile.

Steel foam has the characteristics of compression resistance, sound insulation and energy absorption that are not comparable to low-melting foam aluminum. Compared with aluminum foam, steel foam can work for a long time at 300°C, and can also work in a high temperature environment of 700°C. Therefore, it can be popularized in bulletproof structures such as armored vehicles, armed helicopters, bulletproof vests and helmets, and can meet the ever-changing needs of vehicles, aviation, navigation and construction.