Research On Plasma Atomization Preparation Equipment And Technology Of Titanium Alloy Powder

In recent years,as a new type of alloy,titanium alloy has excellent mechanical properties,which makes it very popular in the fields of medicine and aerospace.However,the processing of medical equipment and engine blades and other components has high dimensional accuracy without secondary pollution,which makes the processing and forming process difficult.The 3D printing technology effectively solves the problems of forming technology using titanium alloys in medical implants,aerospace engine turbine blades and other fields because of its short production time,the limitation of molding without the complexity of parts,and the advantages of saving material and energy.The quality of metal3 D printed titanium alloy powder is an important factor on whether the rapid additive manufacturing technology can be popularized and applied in the manufacture of titanium alloy.Compared with other atomization processes,the self-designed titanium supersonic plasma atomization process replaces the traditional crucible heating process and has higher cooling efficiency.However,in the initial stage of the experimental study,problems such as gas recirculation in the cathode nozzle and poor distribution of the atomizing gas flow in the anode nozzle were found.In order to solve this problem,it is necessary to perform finite element analysis on the atomizing nozzle gas to gain the distribution of the gas flow field in the nozzle.The modeling software and ANSYS-Workbench simulation software platform were used to carry out finite element analysis and experimental verification on the plasma gas and atomizing gas in the supersonic plasma atomizing nozzle designed by ourselves.The main contents of this study are divided into two parts: design and optimization of plasma nozzle and supersonic atomizing nozzle.The finite element dynamics analysis and structural optimization of the reflux area in the supersonic plasma nozzle are completed.The calculation results show that before the structure optimization,when the plasma gas pressure is 0.5MPa,a significant reflux area is generated under the tungsten electrode.The maximum vertical reflow speed in the vertical direction is 15m/s.After optimizing the cathode nozzle and the tungsten electrode structure,the split air passage is opened,and the reflux phenomenon is effectively eliminated The finite element dynamics analysis and structure optimization of the gas flow field in the supersonic atomizing nozzle are completed.The calculation structure shows that the maximum speed at the outlet of the tight coupling ring air passage before the structure optimization is 495m/s,and the maximum speed in the atomization area is 272m/s.After structural optimization,the maximum velocity at the exit of the airway is 614m/s,and the maximum velocity in the atomization region is 345m/s.Meet the design requirements for the speed of the fine spherical titanium powder.The optimized supersonic plasma atomizing nozzle is processed and prepared.The test results showed that the particle size of the prepared titanium alloy powder is mostly concentrated between 50-74μm,which belongs to the range of fine powder,and can be It can be applied in medical level and aviation level and other fields to meet the requirements of design and manufacture.to meet the design and preparation requirements.