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บทที 12 สมบัติอืนๆ ของวัสดุ

บทที 12 สมบัติอืนๆ ของวัสดุ

บทที 12 สมบัติอืนๆ ของวัสดุ

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Ex จงคํานวณค่า saturation magnetization และ saturation flux densityของนิกเกิลที มีความหนาแน่น = 8.90 g/cm 3Net magnetic moment per atomIron 2.22Cobalt 1.72Nickel 0.60MagneticDomains4344Hysteresis LoopCoercivity and Remanence in Permanent Magnets4546Hard magnetic materials• high remanence, coercivity,saturation flux density, low initialpermeability• conventional: magnet steels,cunife (Cu-Ni-Fe) alloys, alnico(Al-Ni-Co) alloys• hi energy: Samarium-cobaltmagnets, Neodymium-iron-boronmagnets4748Soft magnetic materials• high initial permeability, lowcoercivity• easily magnetized & demagnetized• commercial iron ingot, siliconiron,45 Permalloy, supermalloy,Ferroxcube A, B

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