EXPANDED COATING, PREPARATION METHOD AND USE THEREOF, AND PERMANENT MAGNET COMPRISING SAME

• Main Authors: WANG, Pengfei, ZHOU, Bin, LI, Wen, LI, Zhiqiang, SU, Yunting
• Format: Patent
• Language: English
• Published: 28.03.2024
• Subjects: ADHESIVES; BASIC ELECTRIC ELEMENTS; CHEMICAL PAINT OR INK REMOVERS; CHEMISTRY; COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; CORRECTING FLUIDS; DYES; DYNAMO-ELECTRIC MACHINES; ELECTRICITY; FILLING PASTES; GENERATION; INDUCTANCES; INKS; MAGNETS; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; PAINTS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; POLISHES; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES; TRANSFORMERS; USE OF MATERIALS THEREFOR; WOODSTAINS

The present disclosure provides an expanded coating, a preparation method and use thereof, and a permanent magnet comprising same. The expanded coating described herein comprises pores and a filler resin arranged among the pores; the pores comprise at least a spheroid pore having a cross section with a long diameter and a short diameter; in the cross section of the expanded coating, the area of the spheroid pores accounts for 50%-60% of the cross-sectional area of the expanded coating. The permanent magnet of the present disclosure comprises the expanded coating. The expanded coating has high strength and can exhibit excellent mechanical properties and corrosion resistance at high temperatures (such as 170° C.), with a shear strength greater than 2 MPa, a tensile strength greater than 2 MPa, an oil resistance greater than 1800 h and a neutral salt spray performance greater than 288 h at 170° C.