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高汝伟
,-0001,():
-1年11月30日
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高汝伟, R.W. Gao, D.H. Zhang, H. Li, J.C. Zhang
Appl. Phys. A 67, 353-356 (1998),-0001,():
-1年11月30日
The effects of the alignment degree of grain "easyaxes" on the hard magnetic properties of NdFeB sintered magnets have been investigated. The results show that the remanence polarisation Jr increases monotonously with an enhancement in the degree of grain alignment (i.e. decrease in the orientation coefficient
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【期刊论文】Hard magnetic property and δm (H) plot for sintered NdFeB magnet
高汝伟, R.W. Gao a, *, D.H. Zhang a, W. Li b, X.M. Li b, J.C. Zhang a
Journal of Magnetism and Magnetic Materials 208(2000)239-243,-0001,():
-1年11月30日
The hard magnetic properties and the interactions between the grains for sintered Nd16 Fe73 Co5 B6 magnets are investigated by using δM (H) plot technique. The results show that the δM (H) plot of NdFeB sintered magnet can explain the effects of the microstructure (size, shape and orientation of the grains) and the intergrain interactions on the hard magnetic properties of the magnet. However, the value of δM (H) is positive when the applied field is not strong enough, which means that the common δM (H) plot theory is not completely consistent with the sintered NdFeB magnet.
Sintered magnet, Hard magnetic property, Magnetostatic interaction between the grains, Exchange coupling interaction, δM (, H), plot technique
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【期刊论文】Comparison of the texture functions describing the grain alignment in NdFeB magnets
高汝伟, R.W. Gao*, D.H. Zhang
Journal of Magnetism and Magnetic Materials 195(1999)168-173,-0001,():
-1年11月30日
Two types of Gaussian distribution function ('θh type' and 'tan θ type') describing the degree of grain alignment in sintered NdFeB magnets have been compared in the distribution coe¦cient p (or óg), the distribution probability P (θ) and the grain alignment dependence of coercivity. The results show that when the grain alignment is good (the ratio of remanence-to-saturation polarization Jr/Js≥0.90), ó(óg) and P (θ) for the two types of Gaussian functions have similarvariation tendencies, the calculated values of normalized coercivity based on the starting field theory are basically the same and are consistent with experiments. When the grain alignment is not good (Jr/Js*0.80), the variation tendencies of ó and P (θ) are different. In addition, according to 'tan θ type' Gaussian function, the theoretical values of the normalized coercivity based on the starting field theory are still consistent with the experiments, but according to 'θ type' Gaussian function, the theoretical values seriously deviate from the experiments. This means that the 'tan θ type' Gaussian function is a better texture function for describing the grain alignment.
Comparison, Texture functions, Grain alignment, NdFeB magnet, ', tan θ type', Gaussian function
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高汝伟, R.W. Gao a*, D.H. Zhang a, Y.M. Zhang a, W. Li b, Y.S. Wang b, X.J. Yu b
Journal of Magnetism and Magnetic Materials 224(2001)125-131,-0001,():
-1年11月30日
Effects of interactions between grains with different alignment degrees on the coercivity and its angular dependence for Nd16 (Fe0.8 Co0.2) 78 B6 sintered magnets have been studied. The experiments show that the intrinsic coercivity jHc decreases with enhancing grain alignment (decreasing alignment coefficient ó), the coercivity jHc (θ) increases with increasing angle θ between the applied field and the texture axis of the magnets and the variation ratio is larger for the magnets with better grain alignment. The coercivity of the magnets should be determined by the critical field making the moment of individual grains reverse and the interactions between the grains. For the sintered magnets composed of the grains with μm size, the magnetostatic interaction between the grains is stronger than the exchange coupling interaction and it makes the coercivity of magnet increase with increasing alignment coefficient ó. Taking into account the intergrain interactions, the starting field theory of coercivity is in good agreement with the experimental results for Nd16 (Fe0.8 Co0.2) 78 B6 sintered magnets.
Nd (, FeCo), B sintered magnets, Coercivity, Intergrain interaction, Grain alignment, Starting field theory
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