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magnetic materials

advanced environmentally clean processing; use of modern magnetic materials for environmental applications

In the application of high-energy permanent magnets we studied the influence of a magnetic field on the crystallization form of calcium carbonate in hard water. The following analytical methods were used: FT-IR spectroscopy, X-ray analysis, and TEM. Using these methods we were able to confirm the influence of the applied magnetic field on the nucleation and further crystallization of CaCO3. We established that if we use an applied magnetic field to treat hard water the resulting precipitate consists of 50-nm crystallites of aragonite and vaterite. These precipitates float away or can be easily removed from the exposed surfaces. In the hard water that is not exposed to the magnetic field, calcite is the main crystal that is formed and this precipitates as micron-sized crystals. These crystals stick together and form a hard scale. The applied part of this research work has shown the positive influence of the magnetic field on the crystal form of calcium carbonate in the presence of impurity elements for various applications, which is of great environmental importance.

Crystalls of calcium carbonate with different impurities

In the classical powder-metallurgy production of fine-grained powders based on RE-TM intermetallic alloys milling is the most sensitive step of the technological process. The milling media has to be an organic liquid due to the sensitivity of the powders, and milling is also an energy-consuming process. With the advanced HDDR processing, which we are using to the preparation of fine-grained powders, we avoid the use of organic liquids and we save energy.

 

comments & suggestions to:  sanja fidler