高性能各向异性Sm2Fe17Nx磁粉的制备

本文研究了高性能各向异性Ｓｍ２Ｆｅ１７Ｎｘ磁粉的制备工艺路线与工艺参数。优化了制备与工艺参数。已制备出磁性能达到：Ｂｒ＝１．３９Ｔ，Ｈｃｉ＝８５０ＫＡ／ｍ和（ＢＨ）ｍ＝２３６ＫＪ／ｍ＾３的各向异性Ｓｍ２Ｆｅ１７Ｎ２．８８磁粉，该磁粉的各向异性场ＨＡ达到２０Ｔ。     

The Stability of Rare Earth-Iron-Nitrides Sm_2(Fe,M)_(17)N_y,Permanent Magnets

The effects of the partial substitution of element M(M=Cr,V,Mn,x=0.05;Zr,Ga,x=0.017;Si,x=0.15;Co,x=0.10)for Fe in samarium-iron-nitride Sm_2(Fe_(1-x)M_x)_(17)N_y compounds on their stabilitiesand Curie temperatures have been studied.It is found that Co,Ga can raise the Curie temperature of thecompounds.The initial decomposition temperatures cannot be raised significantly by all the studied elementsexcept Co.The result contradicts the formation enthalpy consideration.The final decomposition tempera-tures can be raised by all of the substitution elements.The effects of atmospheres on their decomposition be-havior were also studied.The results show that oxidation is the major reason for magnetic deterioration ofthe powder heated in air.Compared with nitrogen atmosphere,argon or vacuum helps to delay the decompo-sition of the compounds.     

零电阻温度85.3K的Bi系氧化物超导体

用快淬工艺成功地制成起始转变温度112K、零电阻温度85.3K的Bi-Sr-Ca-Cu新型氧化物超导体.样品在84.0 K附近呈现明显的抗磁效应.     

Relation of the Coercivity with the Grain Alignment Degree in Nd－Fe－B Sintermagnets

ＲｅｌａｔｉｏｎｏｆｔｈｅＣｏｅｒｃｉｖｉｔｙｗｉｔｈｔｈｅＧｒａｉｎＡｌｉｇｎｍｅｎｔＤｅｇｒｅｅｉｎＮｄ－Ｆｅ－ＢＳｉｎｔｅｒｍａｇｎｅｔｓＧａｏＲｕ－Ｗｅｉ（高汝伟）；ＺｈａｎｇＹａ－Ｍｉｎｇ（章亚明）；ＬｉＨｕａ（李华）；ＪｉａｎｇＳｈｏｕ－...     

金属件变形对金属—陶瓷封接应力的影响

通过一种陶瓷和一些新合金的封接试验和测量封接过程中的应力,提出了一些降低陶瓷电子管内应力的方法。     

电阻测量新方法

采用Ｘ－Ｙ记录仪、恒流源等仪器，利用电流通过电阻产生电压降的原理，测量固体物质电阻，与目前常采用的电桥或电位差计的测量方法相比，测量结果较准确、可靠，精度高，重复性好，而且减少了所用仪器数量，测量手续简便、快捷，为精密电阻测量和金属电阻的研究提供了一个新途径。     

用X－Y记录仪测量微电阻

采用Ｘ－Ｙ记录仪、恒流源等仪器，利用电流通过电阻产生电压降的原理，测量固体物质电阻，与目前常采用的外用电桥或电位差计的测量方法相比，测量方法简单、可靠、重复性好。     

用X—Y记录仪测量微电阻

采用Ｘ－Ｙ记录仪，恒流源等仪器，利用电流通过电阻产生电压降的原理，测量固体物质电阻，与目前常采用的外用电桥或电位差计的测量方法相比，测量方法简单，可靠，重量性好。