Microscopic Analysis And Database Of 2:17 Type Sm Co Permanent Magnetic Material

In virtue of the high Curie temperature, excellent temperature stability and the outstanding corrosion resistance of the 2:17-type Sm Co permanent magnet materials, it plays an irreplaceable role in the field of aerospace, spaceflight and navigation, which need the high temperature as the work condition. With the rapid development of national defense industry in recent years, the permanent magnet materials was faced with more stringent requirements in the aspect of working temperature and temperature stability. The controlling of process condition of the magnet directly affects the consistency of the microstructure and composition, which has a crucial impact on the magnetic performance of the final magnetic product. In response to the issues above, the scanning electron microscopy, X-ray energy dispersive spectroscopy and X-ray fluorescence were used to conduct the research related. The main content and achievement are as follows:(1) The research on the electron microscopic analysis technology in application of Sm Co permanent magnet materials. the backscattered electron imaging of the scanning electron microscopy and the X-ray energy dispersive spectroscopy were used to confirm the distribution and composition of metallographic phase; the appropriate milling process was selected based on the micro-morphology of the powder obtained by the diverse processes; the optimal time to aging process was cleared on the basis of distribution of the precipitation hardening of samples treated at different aging time combined with the theory related. Those applications above had a guiding significance in the micro analysis of the various production processes, which laid a foundation for the follow-up work.(2) The research on the cause of the degradation in magnetic properties at the high temperature. The experiments were set up according to the diverse phase transformation temperature, and the phase structure of the samples treated at different temperature were compared, then the magnet was placed in the high temperature metallurgical microscope to observe in real time. According to the results above, the change regularity of metallographic phase with the temperature was confirmed, and the reason of the degradation in magnetic properties at the high temperature was clarified combined the analysis results of microstructure and the composition of the precipitated phase with related theory.(3) The research on the component measuring method aiming at the low temperature coefficient 2:17-type Sm Co permanent magnet with Er doped. The appropriate testing spectral lines among which there were weak mutual interference and the exact diffraction angle corresponded were determined by actual measurement, the standard samples with different content of Er were prepared by pressed powder to create the calibration curves of different elements, and the absorption enhancement effect was eliminated by standard curve method to develop the X-ray fluorescence spectrum of the material. The effect of the trace oxygen brought in the actual production process on the analysis results plays a negligible role, which was confirmed combined with theoretical results and the actual measurement. The precision and accuracy of the method meet the requirement of the consistency analysis, which was available for the samples obtained from the various production processes.(4) The research on the design and development of the database software aimed at the rare earth cobalt permanent magnet. The database software was developed based on the platform of Visual Studio by using the Access to store the data, and to which the original analysis data and the typical case report related obtained over these years were added. The database realized the function of search, review, modify, and add, which ensure the valid storage and security access to these valuable experimental data, so that the researchers could use these data for reference.According the work above, the Sm Co permanent microscopic study and the component analysis method was enriched, which provided the basis and reference for the further theoretical research and process control.