Powder Injection Molding(PIM)of Hard and Soft Magnetic Materials
Most of the energy transformation systems which convert electrical to mechanical energy are electric motors.Totally 95%of the conversion systems are electric motors.Furthermore,growth in the electric car and robot industries continue to grow rapidly in these days.Enhancing the efficiency of the electric motor is the key to the development of the future industry.In this regards,the importance of the magnet which is the major part of the electric motors has come to worldwide attention.At the same time,complex shaped magnet components with miniaturization may possibly be required in the market.For this reason,the magnetic powder injection molding process can be a good solution for developing the magnet part that industries need nowadays.In this research,PIM techniques with the two types of magnetic materials are presented; these are the soft and hard magnets.In the first part,the soft magnetic alloys for motor applications are reviewed with PIM process.Basically,the soft magnetic alloys are made of Fe-Si-P and Fe-P powder mixtures for DC and AC applications.The effect of Fe-17 at%P addition and sintering conditions on the magnetic properties,such as core loss and magnetic induction,are studied.In addition,the master sintering curves were also developed to predict the densification behavior.The second part deals with a systematic method for predicting the magnetic properties of the anisotropic hard magnet with PIM process.The magnetic performance of the molded part depends on the orientation of the magnetic particles and magneto-rheological behaviors during the process.The rheological properties of strontium ferrite are determined.A magnetic particle orientation model is developed to predict the orientation of the magnetic particles by extending the mathematical work of Jeffery.Taking it a step further,a modified rheological model in consideration of the mold flow behaviors with the external magnetic field is developed by combining Shliomis model and the empirical viscosity model.
Powder injection molding Soft magnet Core loss Hard magnet Particle orientation model
Shin Da Seul Jung Im Doo Park Seong Jin
Department of Mechanical Engineering,Pohang University of Science and Technology(POSTECH),Pohang,376 Department of Powder Technology Korea Institute of Materials Science(KIMS)797 Changwon-Daero,Seongsa
国际会议
北京
英文
704-712
2018-09-16（万方平台首次上网日期，不代表论文的发表时间）