Metal Abrasives Is An Essential Part Of Metal Parts 3D Printing Technology
Metal Abrasives is an essential part of metal parts 3D printing technology
3D printing used by the Metal Abrasives generally requires high purity, good spherical shape, narrow particle size distribution, low oxygen content. At present, the Metal Abrasives materials used in 3D printing are mainly titanium alloy, cobalt chromium alloy, stainless steel and aluminum alloy materials, in addition to printing jewelry for gold, silver and other precious Metal Abrasives materials. 3D printing Metal Abrasives as a metal part of the 3D printing industry chain the most important part, but also the greatest value lies.
In the "World 3D Printing Technology Industry Conference 2013", the world's 3D printing industry, the authority of experts on the 3D printing of Metal Abrasivess to give a clear definition, that is less than 1mm in size of the metal particles. Including single Metal Abrasivess, alloy powders, and certain refractory compound powders having metallic properties. At present, 3D printing Metal Abrasives materials include cobalt-chromium alloy, stainless steel, industrial steel, bronze alloy, titanium alloy and nickel-aluminum alloy. However, 3D printing Metal Abrasives in addition to need to have good plasticity, but also must meet the powder particle size is small, narrow particle size distribution, high sphericity, good mobility and higher bulk density requirements.
Titanium alloy has the advantages of high temperature resistance, high corrosion resistance, high strength, low density and biocompatibility. It has been widely used in aerospace, chemical industry, nuclear industry, sports equipment and medical equipment. Traditional forging and casting technology of titanium alloy has been widely used in high-tech fields, a Boeing 747 aircraft with titanium content of 42.7t. However, the traditional forging and casting methods to produce large-scale titanium alloy parts, due to high product cost, process complexity, low utilization of materials and subsequent processing difficulties and other unfavorable factors, hinder its more extensive application. The metal 3D printing technology can fundamentally solve these problems, so the technology in recent years become a direct manufacture of titanium alloy parts of the new technology. The development of new titanium-based alloy is the main direction of titanium alloy SLM application research. As the titanium and titanium alloy strain hardening index is low (approximately 0.15), Metal Abrasives resistance to plastic shear deformation and wear resistance is poor, thus limiting its parts in high temperature and corrosion wear conditions.
However, the melting point of rhenium (Re) is very high, Metal Abrasives generally used for ultra-high temperature and strong thermal shock working environment, such as the use of metal organic chemical vapor deposition (MOCVD) preparation Re-composite nozzle has been successfully applied to the aeroengine combustion chamber, operating temperature Up to 2200 ℃. Therefore, the preparation of Re-TI alloys in the aerospace, nuclear energy and electronics is of great significance. Ni has a magnetic and good plasticity, so Ni-TI alloy is commonly used as a shape memory alloy. The alloy has properties such as pseudo-elasticity, high elastic modulus, damping characteristics, biocompatibility and corrosion resistance. In addition, titanium alloy porous structure of artificial bone research is increasing, but also through the 3D printing technology to 4 patients with cervical disc herniation to produce different artificial bone and successful transplantation, the artificial bone is Ni-TI alloy.
Stainless steel with chemical resistance, high temperature and good mechanical properties and other characteristics, because of its powder molding is good, the preparation process is simple and low cost, is the first application of 3D metal printing materials. Such as Huazhong University of Science and Technology, Nanjing University of Aeronautics and Astronautics, Northeastern University and other institutions in the metal 3D printing research more in-depth. The research is mainly focused on reducing the porosity, increasing the strength and the spheroidizing mechanism of the Metal Abrasives in the melting process. Li Ruidi and so on with different process parameters, the 304L Metal Abrasives SLM forming test, obtained 304L stainless steel density empirical formula, and summed up the grain growth mechanism.