共搜索到657条信息,每页显示10条信息,共66页。用时:0小时0分0秒375毫秒
Effect of niobium on thermal stability and impact toughness of Nd-Fe-B magnets with ultra-high intrinsic coercivity胡志华1,刘国军2,王会杰21. Department of Materials Engineering,Hubei University of Automotive... of ultra-high intrinsic coercivity of Nd-Fe-B magnets were investigated.The results showed that the addition of Nb could improve the thermal stability,and obviously increased the impact toughness......
Sensitivity of coercivity and squareness factor of a Nd-Fe-B sintered magnet on post-sintering annealing temperature梁乐1,武梦艳1,刘丽华1,马冲1,王静1,张江东2,张澜庭11. School of Materials Science and Engineering... was available for this magnet to achieve a relatively high coercivity(1671 k A/m) at a relatively low Dy content(3 wt.%). However, squareness factor(SF) of the demagnetizing curve and its temperature......
Sensitivity of coercivity and squareness factor of a Nd-Fe-B sintered magnet on post-sintering annealing temperature梁乐1,武梦艳1,刘丽华1,马冲1,王静1,张江东2,张澜庭11. School of Materials Science and Engineering... was available for this magnet to achieve a relatively high coercivity(1671 k A/m) at a relatively low Dy content(3 wt.%). However, squareness factor(SF) of the demagnetizing curve and its temperature......
Effect of niobium on thermal stability and impact toughness of Nd-Fe-B magnets with ultra-high intrinsic coercivity胡志华1,刘国军2,王会杰21. Department of Materials Engineering,Hubei University of Automotive... of ultra-high intrinsic coercivity of Nd-Fe-B magnets were investigated.The results showed that the addition of Nb could improve the thermal stability,and obviously increased the impact toughness......
Uneven Evolution of Microstructure, Magnetic Properties and Coercivity Mechanism of Mo-Substituted Nd–Ce–Fe–B AlloysLi-Li Zhang1,Jie Song1,Sajjad Ur Rehman1,Jia-Jie Li1,Lei Wang1,2,Mu-Nan Yang1,Ren... morphologies,microstructures and magnetic properties of the designated alloys.It is found out that the coercivity Hcj increases unevenly from 12.2 kOe for(Nd0.8Ce0.2)13Fe82B5 to the maximum value of 13.3......
the Fe content x reached 0.21. However, the intrinsic coercivity Hci at room temperature increased gradually when the Fe content x increased from 0.09 to 0.15, but when x further increased to 0.21, Hci...℃, respectively, showing good high temperature stability, which could be used in high temperature applications. Key words:rare earth permanent magnets; SmCo alloys; coercivity; temperature coefficient; [全文内容正在......
火山玻璃风化层的透射电镜研究 洪汉净1,盘晓东2,刘辉1,张秉良1 (1.中国地震局地质研究所,北京,100029;2.吉林省地震局,吉林,长春,130022) 摘要:利用透射电镜(TEM)和X射线能谱(EDX)研究了长白山天池火山1000年和4000年前两次大喷发产生的火山玻璃风化层特征.TEM分析显示,4000年前大喷发浮岩中的火山玻璃风化层平均厚度3.7 mm,1000年前大喷发浮岩中的火山玻璃风化层平均厚度为1.0 mm.EDX分析显示,两次大喷发浮岩中的火山玻璃风化层化学组成与火山玻璃相比富Al,Fe,而si减少.火山玻璃风化层富Al发生在Al的浓度较高的中到弱酸溶液中(pH=......
风火山冻土隧道爆破技术研究 () 摘要:以青藏高原风火山隧道常年冻土(岩)爆破技术为研究对象,运用理论分析,试验研究,数值模拟和现场测试等方法,对冻土爆破技术进行了系统研究.通过对隧道数值模拟发现隧道轮廓顶部震动速度最大,温度变化比较明显.分析了影响冻土热平衡的外部热源因素,并完成了NaCl水溶液降低爆生气体温度试验,在周边炮眼采用盐水炮泥解决了爆生产物热源问题;针对隧道围岩性质,提出了不同围岩条件下开挖方案,最后对隧道爆破振动进行了监测. 关键词:风火山隧道; 冻土; 爆破; [全文内容正在添加中] ......
长白山--国家级火山地质公园 李占军1 (1.吉林省安图县地矿局) [全文内容正在添加中] ......
火山渣在墙体材料中的应用 张一成1 (1.丽水市墙体材料改革办公室,丽水,323000) 摘要:火山渣是一种天然轻集料.作者对利用火山渣生产新型墙体材料过程中的颗粒级配,配合比设计,工艺流程等进行了探讨. 关键词:火山渣; 墙体材料; 开发利用; [全文内容正在添加中] ......