共查询到20条相似文献,搜索用时 468 毫秒
1.
本文综述了若干新的金属及其他磁性功能材料的最近进展。这些材料包括巨磁电阻材料、高密度磁记录材料、纳米晶软磁材料、粘结Nd-Fe-B和Sm-Fe-N永磁材料、金属原子簇磁性材料和含Bi石榴石型铁氧体磁光膜材料。 相似文献
2.
3.
综述了1995 ̄1996年间几种金属磁性功能材料的新进展,这些材料包括Fe-Si超薄磁性材料,纳米晶稀土永磁材料,新的巨磁阻抗材料,磁屏蔽和电磁屏蔽用的非晶磁性材料,准晶磁性材料,超导性磁性材料。 相似文献
4.
5.
由全国磁性材料与器件行业协会主办的全国第八届钕铁硼磁性材料会议于2000年10月29日在宁波召开。参加会议的代表320名,交流论文29篇,其中关于烧结钕铁硼材料14篇,粘结钕铁硼材料7篇,综述及设备8篇。国家稀土永磁协作网秘书长沙震亚指出,目前金属镝的涨价幅度比较大,根据铽镝铁生产和战略物资的需求,铽镝有可能继续涨价。而金属钕的价格趋于稳定。目前中国在普通钕铁硼的生产方面已具备足够的实力与钕铁硼生产大国日本和美国竞争,但在高性能钕铁硼生产方面却无法与其竞争,因此,国内在发展普通钕铁硼产业的同时,应大力开发高性能… 相似文献
6.
2000~2001年金属磁性功能材料新进展 总被引:1,自引:0,他引:1
综述了金属磁性功能材料在2000-2001年间的若干新进展,内容包括:(1)高性能稀土永磁合金;(2)高性能硅钢合金;(3)Fe-N系新磁性材料;(4)磁电子学;(5)形状记忆磁性材料。 相似文献
7.
8.
9.
10.
高磁能积的稀土类永久磁体的出现 ,使信息、通讯设备的小型、薄型、轻量化及高性化成为可能。目前稀土类永磁体绝大部分为Nd Fe B ,可分为金属系永磁 (烧结或热加工永磁 )及粘结永磁二种。金属系为各向异性 ,最大磁能积可达 2 2 0~ 4 0 0kJ/m3,由于其大的磁能积故多用于高功率电动机 ,扼流圈、传感器等 ,而粘结磁体大多为各向同性 ,因含粘结剂 ,最大磁能积只有 4 0~ 95kJ/m3,远小于烧结型 ,但工艺简单 ,易得到复杂形状 ,故多用于计算机中驱动电机及手机振动电机。当前性能超过Nd Fe B的材料只有Sm Fe N系。后者与前… 相似文献
11.
V. Panchanathan 《Journal of Materials Engineering and Performance》1995,4(4):423-429
The advent of neodymium-iron-boron materials having excellent magnetic properties and potential economic advantages has initiated
a new era in permanent magnet technology. One method of making these magnets is by the rapid solidification process. It is
typically carried out by melt spinning, which produces a highly stable, dmagnetically hard microstructure powder, directly
from the melt. This can be used for bonded magnet applications. Alternatively, this powder can be hot pressed to produce fully
dense isotropic magnets with energy products up to 15 MGOe. Anisotropic magnets with energy products ranging up to 50 MGOe
can be produced by thermomechanical orientation or hot deformation process. Current processing and properties of Magnequench
(General Motors) materials are reviewed, das well as the applications and advances of these materials. The advances include
high-temperature bonded magnet and high-energy product anisotropic bonded and fully dense magnets. 相似文献
12.
13.
各向异性粘结NdFe12Nx磁体工艺探讨 总被引:1,自引:0,他引:1
用不同的工艺制备了各向异性粘结NdFe12Nx磁体,并对影响其各向取向度的各个因素进行了分析。结果表明,在制备各向异性粘结NdFe12Nx磁体过程中对磁粉进行强磁场处理、湿法处理,可以较大程度提高粘结磁体的取向程度,从而制得性能优异的各向异性粘结磁体。 相似文献
14.
粘结钕铁硼磁体阴极电泳工艺研究 总被引:3,自引:0,他引:3
粘结NdFeB磁体极易被腐蚀,因而需要涂层保护.本文研究了粘结NdFeB磁体的阴极电泳工艺,主要是电泳电压,电泳时间,电泳时漆液温度以及涂层烘烤固化对涂层抗蚀性的影响.研究发现用合适的工艺参数所获得的涂层能够显著提高粘结NdFeB磁体的抗蚀性能. 相似文献
15.
16.
Siwu Tao Xin Lu Jianjun Tian Xuanhui Qu Y. Honkura H. Mitarai K. Noguchi 《稀有金属(英文版)》2009,28(3):245-247
Anisotropic bonded magnets were prepared by warm compaction using anisotropic Nd-Fe-B powder. The forming process, magnetic properties, and temperature stability were studied. The results indicate that the optimal temperature of the process, which was decided by the viscosity of the binders, was 110℃. With increasing pressure, the density of the magnets increased. When the pressure was above 700 MPa, the powder particles were destroyed and the magnetic properties decreased. The magnetic properties of the anisotropic bonded magnets were as follows: remanence Br = 0.98 T, intrinsic coercivity iHc=1361 kA/m, and maximum energy product BHmax = 166 kJ/m3. The magnets had excellent thermal stability because of the high coercivity and good squareness of demagnetization curves. The flux density of the magnets was 35% higher than that of isotropic bonded Nd-Fe-B magnets at 120℃ for 1000 h. The flux density of the bonded magnets showed little change with regard to temperature. 相似文献
17.
18.
19.
Bonded NdFeB magnets were prepared by compression molding. The effect of preparation technology on their magnetic and mechanical properties was studied through the analysis of density, Br Hcj, (BH)max, bending strength, and compressive strength of the bonded magnets. The results showed that the magnetic properties decreased with increasing binder content, whereas the mechanical properties increased. Brand (BH)max increased with rising pressure, whereas Hcj decreased. For a fixed mass fraction of the binder, the optimal pressure was 620 MPa and the best thermosetting temperature was 160℃. These conditions made the bonded magnets have the optimal mechanical properties. Scanning electron microscopy (SEM) analyses of the fracture surfaces indicated that the epoxy resin bonded magnets exhibited brittle behavior. 相似文献
20.
粘结剂作为粘结NdFeB磁体制备过程中的重要组成部分,其作用是提高磁粉颗粒的流动性和粘结强度,保证产品的力学性能和磁性能的稳定。采用理论与实验相结合的方法,研究了粘结剂含量对粘结NdFeB磁体力学性能和磁性能的影响。在此基础上,制备了高性能粘结NdFeB磁体。利用扫描电子显微镜(SEM)对磁体的结构和形貌进行了表征。在NIM-200C磁滞回线仪和电子万能试验机(AG-X plus)上分别测定了环形粘结NdFeB磁体(RSM)的磁性能和力学性能。结果表明,当粘结剂含量为3%(质量分数)时,粘结NdFeB磁体密度最高(5.59 g/cm3),抗压强度最高(159 MPa),磁性能最佳。 相似文献