The Effect Of Thermal Current On Atomizing Effect Of Spray Forming

Spray forming is a new kind of high performance material preparation technology,through the air to reduce the size of metal melt so that the rapid solidification of metals toobtain high performance material. Coarse grains, segregation serious drawback of thistechnique can not only overcome the traditional casting process, but also can significantlyimprove the powder metallurgical process of complex processes, materials susceptible tooxidation and other issues, is a potential technology.Combined with the existing structure of the spray forming atomizer, heating treatmenton the airflow into the atomizer. The heater is composed of flow channel, heating cover,test pressure gauge, composed of the linker etc.. Through the heat pipe and the atomizerlink. Heater through the current is converted into heat energy to heat, the heating ring withthe controller ensures that the heating temperature, outlet pressure table to determine theflow state. Link atomizer to limit the atomizer, annular gap of1mm35degree angle.Injection forming process, spray drop size size is measured deposition quality stand orfall, one of the main standard, refining drop size is aerosol chemical technology researchhot spot. Because the gas has energy is proportional to the square of the velocity, this studyputs forward to improve air to be heated air energy, thus refining drop this new idea, theuse of numerical simulation and experimental measurement, mechanism analysis, andother means to spread the heat flow technology research.With the numerical simulation method, the gas through the heat exchange channelprocess is simulated and analyzed. The establishment of two-dimensional geometric modelbased on actual experimental equipment, without heating were simulated respectively, andthe temperature of200℃,350℃, distribution of gas flow at500℃. From thesimulation results: increase airflow can effectively improve the speed of airflow. The airoutlet temperature and velocity roughly in line with the formula: V=0.32T+155.4.According to the experimental conditions. Gas are50℃,100℃,150℃, relative to theunheated state of airflow speed5.6%,12.1%,18.7%respectively.Based on the numerical simulation results, the atomization experiments with differentheating temperature conditions, and the obtained blank and microstructure under different conditions, metallographic analysis results show: the air was heated to50℃,100℃,150℃and unheated when coMPared with the grain size decreased8.9%,20%,28.9%and more uniform distribution, grain shape more spherical.