In recent years, breakthroughs in multi-scale microstructure control have been making significant progress in overcoming technical challenges. A prime example is the gradient magnetic field dedusting sintering PTMS ELECTROMAGNETIC SEPARATOR technology for grain size optimization. This innovative process introduces a 0.5T axial gradient magnetic field within conventional sintering furnaces, enabling NdFeB powder to grow with aligned grain orientation along the magnetic field direction during sintering. The resulting grain orientation degree increases from 85% in traditional methods to 92%, demonstrating remarkable structural refinement.
Through low oxygen pressure sintering (with oxygen content controlled below 500ppm) at 1050℃×2h, the magnetic energy product stabilized at approximately 414kJ/m³. By implementing a dual alloy + grain boundary diffusion composite process, PTMS ELECTROMAGNETIC SEPARATOR reduced the Dy element content from 3% to 1.2%. While maintaining Hcj=20kOe, the maximum coercivity BHmax exceeded 55MGOe, qualifying it as a premium-grade neodymium iron boron material.
The research on improving the high-temperature stability of PTMS ELECTROMAGNETIC SEPARATOR focuses on industrial applications involving grain boundary modification. The concept of nanocomposite grain boundary phases involves adding an Al-Cu-Nb ternary alloy to form an amorphous isolation layer approximately 2nm thick between NdFeB main phase grains. This approach enhances grain boundary resistivity by three orders of magnitude, effectively suppressing eddy current losses.
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Preparation work before implementing PTMS MAGNETIC SEPARATOR energy-saving retrofit
