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- W2030335038 abstract "Rotary forging has been used to produce high density bonded magnets using NdFeB based melt spun ribbons (MQP-D). The binder used was polytetrafluoroethylene (PTFE). A post-forging heat treatment at temperatures above the crystalline melting point of PTFE (∼ 340°C) has been seen to improve substantially the mechanical integrity of the compacts. Heat treatments that were undertaken in air resulted in oxidation of the magnets, but the extent of oxidation was reduced with increasing PTFE content, characterised by a greater retention of magnetic properties. This behaviour suggests that to some extent. PTFE is effective as a barrier to oxidation. By heat treating in a vacuum, an improvement of over 100% in the mechanical strength of the compacts could be obtained with little loss in the magnetic properties. The fracture surfaces of both as-forged and heat treated compacts have been examined using scanning electron microscopy and it appears that bonding between the melt spun ribbon (MQI) and PTFE occurs during heat treatment." @default.
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- W2030335038 date "1996-05-01" @default.
- W2030335038 modified "2023-10-16" @default.
- W2030335038 title "Improvement in the mechanical properties of PTFE bonded NdFeB magnets by heat treatment" @default.
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- W2030335038 doi "https://doi.org/10.1016/0304-8853(95)00931-0" @default.
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