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    Home > Coatings News > Paints and Coatings Market > 40% increase in strength: preparation results of the new porous titanium alloy cold spraying technology

    40% increase in strength: preparation results of the new porous titanium alloy cold spraying technology

    • Last Update: 2020-11-25
    • Source: Internet
    • Author: User
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    What can porous titanium alloy material do? How do I make it? This can be answered by the latest 3D printing (cold spraying) technology developed by research teams at Cornell University and universities such as MIT. The study, published on November 9 this year under the title "Supersonic Impact 3D Printed Porous Titanium Alloys," was published in Applied Materials Today. In the journal Applied Materials Today.
    image shows cells glued to a titanium alloy printed in 3D by cold spray, suggesting that the material's biosysorption

    .
    the general knowledge structure of this reader, cold spray and 3D printing and other basic concepts are no longer repeated. Simply put, this technology mainly uses powder supersonic shock to form solid bonding, produces high-strength porous titanium alloy well below melting temperature, and can further improve mechanical properties through post-heat treatment, and finally apply it to orthopaedic transplantation and other fields. As shown in the figure above.
    normal metal 3D printing will be due to the powder layer-by-layer melting and solidification of high temperature processing effects, resulting in large residual stress, poor performance. Cold spray technology can compensate for this deficiency, usually the powder experience between the critical velocity (the speed at which dense solids are formed) and the erosion speed (overspeed will break the powder and cannot be combined), which is transmitted to the substrate through the nozzle. "It's similar to painting, but 3D printing accumulates more."
    The team used fluid mechanics to determine a speed (approximately 600m/s) slightly below the critical velocity of the titanium alloy, using a high strain rate to dynamically print Ti-6Al-4V powders with particle sizes between 45 and 106 m, resulting in more than 3D-printed titanium alloy strength increased by 42% of the porous structural material (appearance mod 51.7±3.2gpa, surface pressure yield strength 535±35mpa, porosity rate 30±2%).
    this process is technically known as cold spraying, it does involve some heat treatment. When the particles collided and bindded together, the researchers reheated the metal so that the components spread to each other and precipitated like even matter.
    we use this porous structure to make implants and implant them into the human body, the bones can grow and biometrically fix them in these pores," the researchers said. "This helps reduce the likelihood that the implant will loosen. It's a big deal. Many patients have to have the implant removed again because it is loose and can cause a lot of pain. In
    addition to orthopaedic transplants, which the project focuses on, any metal material that can withstand plastic deformation can benefit from this process. It offers many opportunities for larger industrial applications such as construction, transportation and energy.
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