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首页> 外文会议>第19届国际稀土永磁及应用研讨会（19th International Workshop on Rare Earth Permanent Magnets amp; Their Applications）（REPM'06） >Influence of Heat Treatment Parameters on Properties of NdRFeMCoB Sintered Magnets
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Influence of Heat Treatment Parameters on Properties of NdRFeMCoB Sintered Magnets

机译：热处理参数对NdRFeMCoB烧结磁体性能的影响

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摘要

Influence of multi-step heat treatments on magnetic properties and structure of three magnet types NdRFeMCoB: high-energy (Br > 1,3 T) (A); high-coercive (iHc > 2000 kA/m) (B) and thermally stable (αb< |0,02| %/K in the temperature interval 293-373K) (C) was investigated. Significant affect of condition of Nd2Fe14B phase on high-coercive condition development is shown. High values of iHc in magnets of NdRFeMCoB type can be provided by creating of elasto-stressed condition of Nd2Fe14B phase and minimal stresses values near boundary phases during heat treatments. The highest results on iHc are achieved after multi-step heat treatments. The temperature of the last step of heat treatment for optimal chemical compositions of the alloys (in dependence on the ratio of such elements as Al, Cu, Ga, Pr, Co) is in the interval of 725-905K (preferably, 775-825K). The value of iHc of magnet (B) Nd13,2Tb1,8FebalCo5Mo3,8Al0,9B9(at. %) after heat treatment {f 1175-1075K (4-12 ks) - hardening + 625-725K (3,6-36 ks) + 810K (3,6 ks) - hardening} was 2600 kA/m. It was possible to attain the following properties for the magnets (C) (Nd0.22Pr0.44Tb0.20Ho0.10Gd0.04)15(Fe0.73Co0.27)bal Al0.9Cu0.1Ga0.1B8.5 (at. %) after optimal thermal treatment {1175K (3,6-7,2 ks) with slow (12-16 ks) cooling to 675K and subsequent endurance at T=775K for 3,6 ks - hardening}: Br= 1,0 T, iHc = 1560 kA/m, BHmax = 192 kJ/m3, αb < |0,015| %/K in the temperature interval 293-373K.
机译：多步热处理对三种磁体类型NdRFeMCoB的磁性能和结构的影响：高能（Br> 1,3 T）（A）；研究了高矫顽力（iHc> 2000 kA / m）（B）和热稳定（在温度区间293-373K中αb<| 0.02 |％/ K）（C）。显示了Nd2Fe14B相的状态对高矫顽力状态发展的重要影响。通过在热处理过程中产生Nd2Fe14B相的弹性应力条件和边界相附近的最小应力值，可以提供NdRFeMCoB型磁体的iHc值较高。经过多步热处理后，iHc的结果最高。合金最佳化学成分的热处理最后一步的温度（取决于Al，Cu，Ga，Pr，Co等元素的比例）为725-905K（最好为775-825K） ）。热处理{f 1175-1075K（4-12 ks）-淬火+ 625-725K（3,6-36 ks）之后的磁体（B）Nd13,2Tb1,8FebalCo5Mo3,8Al0,9B9（at。％）的iHc值）+ 810K（3.6 ks）-硬化}为2600 kA / m。磁体（C）（Nd0.22Pr0.44Tb0.20Ho0.10Gd0.04）15（Fe0.73Co0.27）bal Al0.9Cu0.1Ga0.1B8.5（at。％）可能获得以下特性经过最佳热处理{1175K（3,6-7,2 ks），缓慢冷却（12-16 ks），冷却至675K，随后在T = 775K承受了3,6 ks-硬化}：Br = 1,0 T， iHc = 1560 kA / m，BHmax = 192 kJ / m3，αb<| 0.015 |温度区间293-373K中的％/ K。

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