ZnS:Sm and ZnS:Cu,Sm electroluminescent phosphors

Electroluminescent ZnS: Sm and ZnS: Cu, Sm phosphors have been prepared and their electroluminescent (el) characteristics have been studied. The time-averagedel brightness follows the Alfrey-Taylor relation over a wide range of frequencies. The constants of this relation have been determined. Theel emission shows one main and one auxiliary peak during each half cycle of the applied voltage. Variation of current with applied voltage has also been investigated.     

Antioxidation Study of Sm（Co, Cu, Fe, Zr）z-Sintered Permanent Magnets by Metal Injection Molding

2∶17type Sm(Co ,Cu ,Fe ,Zr)zpermanent mag-nets originatedfromthe investigationinthe 1970s .Sm(Co ,Cu ,Fe ,Zr)zpermanent magnets have excellentintrinsic magnetic properties such as very high Curietemperature , high anisotropy fields , and relativelyhigh saturation magnetizations[1 ~4]. Hence the mag-nets play an i mportant role in national defence andmodernindustry .Because of the high brittleness of Sm(Co ,Cu ,Fe ,Zr)zpermanent magnets ,theirtransfor-mationinto complex,small ,precision …     

Preparation and Thermal Stability of Phosphate System Protection Glasses Doped with Rare Earths

The formation ability and thermal stability of phosphate laser protection glass doped with high Sm2O3 content were discussed. The characteristic temperatures (Tg, Tc, Tm) were measured by DSC and the crystallization parameter β was calculated. The results show that the forming regions would shrink and tend to closed ellipse with increasing of Sm2O3 content. Increasing of BaO/Al2O3 ratio changes the network structure of rare earth glass and improves the thermal stability finally. However, with the increasing of Sm2O3 content, the β increases firstly and then decreases, and finally the thermal stability also increases firstly and then decreases.     

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文章介绍可作为我国“西气东输”工程源头的新疆塔里木气田偏远无电地区的井口,输油（气）管道站（场）及通信中继站、气象站,哨所等用电容量小又必须连续供电（如通讯、阴极保护等用电）的场所的非柴油/天然气发电机组供电方式,其中包括：（1）太阳能供电：（2）温差发电（TEG）：（3）密闭循环蒸所发电机（CCVT）装置;（4）风力发电;（5）燃料电池等,还介绍了在实际工程设计中,如何根据负载功率大小,重要程度,环境条件,资源及燃料的供给情况,结合电源设备的可靠性,维护工作量,使用寿命,可否无人值守和经济合理性来确定电源方案。     

三代酸法工艺中草酸反萃钐铕钆试验研究

本文以草酸代替盐酸,进行了反萃钐铕钆的试验研究,找出了草酸反萃的最佳试验条件,并对草酸单级反萃和盐酸8级反萃的效果进行了比较,并进行了工业试验验证.     

块状Sm_2Fe_(17)N_v磁体的制备

为发挥 Sm2 Fe1 7Nx 高温性能好的特点 ,探索了一种制取块状 Sm2 Fe1 7Nx 磁体的新思路 ,即先制备 Sm2 Fe1 7多孔烧结体 ,然后将烧结体在低温下氮化。初步实验得到了磁能积为6.69k J/ m3的 Sm2 Fe1 7Nx 永磁体 ,表明这是一条很有前途的制取高性能 Sm2 Fe1 7Nx 烧结磁体的工艺途径     

Sm2O3和La2O3对甲烷氧化偶联反应的促进作用

研究了在Li2SO4/MgO催化剂中引入少量Sm2O3和La2O3对甲烷氧化偶联反应的影响,并考察了催化剂的稳定性能。结果发现,在Li2SO4/MgO催化剂中引入少量Sm2O3可以提高催化剂活性和生成C2烃的选择性,而加入少量La2O3会降低甲烷转化率。经500h活性考察,Li2SO4/Sm2O3.MgO催化剂表现出良好的稳定性,具有深入研究的价值。     

Mg-5.5Al-0.5Y-xSm合金的显微组织和力学性能

采用XRD、OM、SEM和EDS等手段研究了Mg-5.5Al-0.5Y-xSm(x=0~2.0%)合金的显微组织和力学性能。实验结果表明,加入适量的Sm后,合金晶粒和Al2Y相得到细化,Mg17Al12相数量减少,同时基体中出现高熔点相Al2Sm相。随着Sm含量的增加,合金的室温(25℃)和高温(150℃和175℃)力学性能先升高后降低,且在Sm含量为1%时达到最佳。     

Zr元素及冷却速度对Mg-12Sm合金凝固组织的影响

研究了Mg-12Sm合金在不同冷却条件和添加Zr元素前后凝固组织的变化规律,实验发现水冷模具浇注下冷却速度提高,晶粒细化,二次枝晶臂间距减小,晶间共晶组织体积变小,但总体积分数和分布并没有明显改变;添加0.1%(质量分数)Zr后,晶粒明显细化,树枝晶转化为等轴晶,二次枝晶臂间距减小,晶间共晶组织体积分数增大,共晶组织形貌和分布没有明显变化;Mg-12Sm和Mg-12SmZr合金水冷后Mg基体中Sm含量降低。     

溶胶-凝胶法制备掺杂钐的二氧化钛及其发光性能研究

通过考察加水方式、加水量、反应温度和抑制剂对溶胶的胶凝速率的影响,选用加水方式为滴加方式、钛酸四丁酯和水的体积比为5∶1、反应温度为30～35℃、硝酸作抑制剂的溶胶-凝胶法制备了TiO2粉末和掺杂不同含量Sm3+的TiO2粉末,并对其结构、发光性能和形貌进行了表征.结果表明,所制TiO2粉末为锐钛矿结构,颗粒粒径为5～...