Relation between oxidation microstructure and the maximum energy product loss of a Sm 2 Co 17 magnet oxidized at 500 °C
Relation between oxidation microstructure and the maximum energy product loss of a Sm 2 Co 17 magnet oxidized at 500 °C
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DOI：
10.1088/1674-1056/20/12/127502
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发表时间：
2011-12
影响因子：
1.7
通讯作者：
刘丽丽;蒋成保
中科院分区：
文献类型：
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作者：
刘丽丽;蒋成保
系统研究了Sm(Co0.76, Fe0.1, Cu0.1, Zr0.04)7磁体在500℃氧化后的氧化组织和最大能积（BH）最大损耗。氧化磁体中形成了三个不同的氧化区：连续的外部氧化层、内部反应层和扩散区。室温和高温（BH）最大损耗随氧化时间的增加呈抛物线增长。提出了一个氧扩散模型来模拟（BH）最大损耗随氧化时间的变化。结果表明，外部氧化层对最大损失影响不大，内部反应层和扩散区都对最大损失有影响。扩散区比内部反应层造成更大的（BH）max损失。得到了内反应层氧化速率常数k和扩散区氧扩散系数D的值，分别约为1.91×10−10 cm2/s和6.54×10−11 cm2/s。
The oxidation microstructure and maximum energy product (BH)max loss of a Sm(Co0.76, Fe0.1, Cu0.1, Zr0.04)7 magnet oxidized at 500 °C were systematically investigated. Three different oxidation regions were formed in the oxidized magnet: a continuous external oxide scale, an internal reaction layer, and a diffusion zone. Both room-temperature and high-temperature (BH)max losses exhibited the same parabolic increase with oxidation time. An oxygen diffusion model was proposed to simulate the dependence of (BH)max loss on oxidation time. It is found that the external oxide scale has little effect on the (BH)max loss, and both the internal reaction layer and diffusion zone result in the (BH)max loss. Moreover, the diffusion zone leads to more (BH)max loss than the internal reaction layer. The values of the oxidation rate constant k for internal reaction layer and oxygen diffusion coefficient D for diffusion zone were obtained, which are about 1.91×10−10 cm2/s and 6.54×10−11 cm2/s, respectively.