The knowledge sharing brought to you today is nickel-based alloys and cobalt-chromium alloys. Nickel-based alloy is an excellent aerospace material, and cobalt-chromium alloy is an ideal human implant material. Among them, nickel-based alloy materials are especially suitable for SLM molding technology, and are also widely used in ExOne's 3DP (adhesive injection molding) technology.
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Nickel base alloy is a kind of alloy which has high strength and certain anti-oxidation and corrosion resistance at 650-1000 °C. Compared with iron-based alloys and cobalt-based alloys, nickel-based alloys can work under high temperature and high stress conditions, and have good mechanical properties, oxidation resistance and heat corrosion resistance. With the development of aviation industry, 3D printed nickel-based alloy articles are used for the preparation of hot end parts such as turbine disks and turbine blades in aeroengines due to their excellent performance, which improves the stability and thermal efficiency of the engine. Power has more thrust. Nickel alloy containing 50% titanium has good shape memory effect and is used for manufacturing spacecraft structural parts and artificial heart motors.
IN718 Nickel-Based Superalloy Rotor Prepared by 3D Printing Technology in the United States (Source: Machine Design)
3D printed nickel-based alloy industrial parts (Source: ExOne)
3D printed nickel-base alloy aircraft parts (Source: 3dprintingindustry.com)
Cobalt chromium alloy
Cobalt-chromium alloy is a superalloy with cobalt and chromium as its main components. It has excellent corrosion resistance and mechanical properties. The parts made with it have high strength, high temperature resistance and outstanding biological properties. Compatibility, first used in the production of human joints, has now been widely used in the oral field. Because it does not contain harmful nickel and antimony elements, 3D printing of customized cobalt-chromium alloy porcelain teeth has become the first choice for non-precious metal porcelain.
Cobalt-chromium alloy in dental applications (Source: 3ders.com)
The cobalt-chromium alloy produced by the traditional casting process has a large shrinkage rate, and the error is larger than that of the initial model. The cobalt-chromium alloy parts manufactured by the 3D printing technology have high strength and accurate dimensions, and the minimum size that can be produced can reach 1 mm. Therefore, the mechanical properties of its components are much better than those made by the forging process.
3D printed cobalt-chromium aerospace engine impeller (Source: Shanghai Aerospace Technology Research Institute)
Liquid metal
Liquid metal refers to an amorphous metal. The liquid metal used for 3D printing is usually composed of gallium and indium alloys that are non-toxic and can remain liquid at room temperature. In 2013, researchers from the University of North Carolina in the United States. Development. When the liquid metal is exposed to the air, the surface of the material hardens, but the interior remains liquid, which is why it remains flexible. Since the liquid metal can conduct electricity, it means that it is possible to use a similar technology to make a liquid metal circuit board using a 3D printer .
The application of liquid metal has broad prospects. In addition to printed circuit boards, liquid metal has excellent thermal conductivity in advanced chips and new energy fields. In the field of medical health technology, unique liquid metal materials directly contribute to the formation of liquid metal biomaterials. Liquid metal also has room for development in nerve connection and repair, rapid replacement of damaged bones, implantable medical devices directly in vivo 3D printing, high-resolution angiography, and tumor vascular occlusion therapy.
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