开关电源用的纳米晶Fe74Cu1Nb1Mo2Si13B9合金的磁性能

本文报道了新开发的纳米晶Ｆｅ７４Ｃｕ１Ｎｂ１Ｍｏ２Ｓｉ１３Ｂ９合金的综合磁性能。无磁场最佳退火后,直流磁性能达到下列水平：Ｂ８０＝１．１７Ｔ,Ｂ８＝１．０９Ｔ,Ｂｒ＝０．５４Ｔ,Ｈｃ＝０．８Ａ／ｍ,μｉ＝１３．１８×１０４,μｍ＝３１×１０４。典型高频铁损达到下列水平：Ｐ５／２０ｋ＝１３５ｋＷ·Ｍ－３,Ｐ２／１００ｋ＝３３０ｋＷ·Ｍ－３,Ｐ１／２００ｋ＝２７３ｋＷ·Ｍ－３,Ｐ０．５／７００ｋ＝５９８ｋＷ·ｍ－３,Ｐ０．２／１０００ｋ＝１８６ｋＷ·Ｍ－３。在宽的频率及幅值磁通密度范围内,对铁损进行了分析,给出了几个近似表达式,可用来粗略地估算铁损。简单地叙述了在较大输出功率的开关电源中试用情况。     

纳米日Fe74.7—xCu1NbxV1.8Si13.5B9合金的磁性

本文报道Ｆｅ７４．７－ｘＣｕ１ＮｂｘＶ１．８Ｓｉ１３．５Ｂ９（ｘ＝１，１．５，２）纳米晶软磁合金的综合磁性，Ｘ＝２的合金高频铁损水平为：Ｐ３／１００ｋ＝４６８ｋＷ／ｍ＾３；Ｐ２／２００ｋ＝７０６ｋＷ／ｍ＾３；Ｐ２／５００ｋ＝３６２０ｋＷ／ｍ＾３和Ｐ０．５／１０００ｋ－８１０ｋＷ／ｍ＾３，优于Ｆｅ－Ｃｕ－Ｎｂ－ＳＩ－Ｂ类纳米晶合金的水平，所考察的三种合金铁损水平者大大优于功率优良的Ｍｎ－Ｚｎ铁氧体Ｈ     

新纳米晶软磁合金Fe71.5（CuCrV）7.5Si12B9的磁性能

本文报道新发展的不含Ｎｂ的Ｆｅ７１．５（ＣｕＣｒＶ）７．５Ｓｉ１２Ｂ９纳米晶软磁合金的综合磁性能。直流起始磁导率μｉ＝１０．９×１０＾４；矫顽力Ｈｃ＝０．５６Ａ／ｍ；对应Ｈｍ＝８０Ａ／ｍ的Ｂ８０＝１．０４Ｔ；对应Ｈｍ＝０．０８Ａ／ｍ和ｆ＝０．１和１ＭＨｚ的有效磁导率μｅ＝２．５×１０＾４和０．４×１０＾４；铁损Ｐ２／１００ｋ＝１９５ｋＷ／ｍ＾３；Ｐ２／２００ｋ＝６６４ｋＷ／ｍ＾３；Ｐ２／５００ｋ＝     

纳米晶软磁合金Fe_（72．5）Cu_1Nb_（1．8）Mo_（2．2）Si_（

本文报道新开发的纳米晶软磁合金Ｆｅ７２．５Ｃｕ１Ｎｂ１．８Ｍｏ２．２Ｓｉ１３．５Ｂ９的直流磁性及高频交流磁性。直流相对起始磁导率水平为μｉ＝１１×１０４；高频铁损Ｐ（ｋＷ／ｍ３）的水平如下：Ｐ５／２０ｋ＝１００，Ｐ５／５０ｋ＝４６０，Ｐ２／１００ｋ＝２３８，Ｐ３／１００ｋ＝５４５，Ｐ２／２００ｋ＝８３６，Ｐ２／５００ｋ＝４３５０，Ｐ０．５／１０００ｋ＝９６０。     

纳米晶Fe_(74.7-x)Cu_1Nb_xV_(1.8)Si_(13.5)B_9合金的磁性

本文报道Ｆｅ７４．７－ｘＣｕ１ＮｂｘＶ１．８Ｓｉ１３．５Ｂ９（ｘ＝１，１．５，２）纳米晶软磁合金的综合磁性。ｘ＝２的合金的高频铁损水平为：ｐ３／１００ｋ＝４６８ｋｗ／ｍ３：Ｐ２／２００ｋ＝７０６ｋＷ／ｍ３；Ｐ２／５００Ｋ＝３６２０ｋｗ／ｍ３和Ｐ０．５／１０００ｋ＝８１０ｋｗ／ｍ３优于Ｆｅ－Ｃｕ－Ｎｂ－Ｓｉ－Ｂ类纳米晶合金的水平所考察的三种合金铁损水平都大大优于功率优良的Ｍｎ－Ｚｎ铁氧体Ｈ７Ｃ４考察了起始磁化率的温度关系，观察到原始非晶样品出现两个尖锐的Ｈｏｐｋｉｎｓｏｎ峰，与此不同的是，在具有最佳磁性的样品中只出现第二Ｈｏｐｋｉｎｓｏｎ峰，用Ｔｈｏｍａｓ理论解释了这一现象。观察到高温下纳米α－Ｆｅ（Ｓｉ）晶粒系统的超顺磁行为，起始磁化率的温度关系符合Ｃｕｒｌｅ－Ｗｅｉｓｓ定律。     

退火对Fe_(66)Cr_8Cu_1Nb_3Si_(13)B_9条带磁弹性的影响

退火对Ｆｅ６６Ｃｒ８Ｃｕ１Ｎｂ３Ｓｉ１３Ｂ９条带磁弹性的影响测定了Ｆｅ６６Ｃｒ８Ｃｕ１Ｎｂ３Ｓｉ１３Ｂ９合金带退火后纳米晶引起的变化来观察磁场与合金杨氏模量的关系。将３ｍｍ宽、２５μｍ厚的Ｆｅ６６Ｃｒ８Ｃｕ１Ｎｂ３Ｓｉ１３Ｂ９非晶合金带材切成５ｃｍ长...     

快速凝固（Sm1—xBx）Fe2合金的结构和磁性

采用真空单辊快淬法（铜辊,线速度达２０～２３ｍ／ｓ）将成分为（Ｓｍ１－ｘＢｘ）Ｆｅ２（ｘ＝０,０．０１５,０．０３,０．０４５,０．０６）合金锭,制成快速凝固的鳞片状合金,再经粉碎在３０ＭＰａ压力下,模压成φ１０ｍｍ圆片,然后进行ＸＲＤ分析,比磁化强度和磁致伸缩（λ″－λ┴）的测量。实验结果表明各样品只有少量非晶相,主要是ＳｍＦｅ２及少量的ＳｍＦｅ５和ＳｍＦｅ７化合物。样品（Ｓｍ０．９８５Ｂ０．０１５）Ｆｅ２和（Ｓｍ０．９４Ｂ０．０６）Ｆｅ２,在７２０ｋＡ／ｍ磁场下,比磁化强度分别为：５９．５,５２．３Ａｍ２ｋｇ－１,在８８５ｋＡ／ｍ磁场下（λ″－λ┴）分别为：－５１０×１０－６和－３１０×１０－６。     

超微晶合金FE_（73．5）CU_1Nb_3Si_（13．5）B_9晶化相的电镜

用透射电镜和能谱仪分析了Ｆｅ７３．５ＣＵ１Ｎｂ３Ｓｉ１３．５Ｂ９合金经不同温度退火后的组织、晶化相结构以及不同晶化相中的各元素含量变化。合金于４５０℃退火１ｈ析出尺寸小于５ｎｍ的ｂｃｃＦｅ（Ｓｉ）相，并且其尺寸随退火温度的升高而增大到约１５ｎｍ。于６００℃退火时合金中析出四方结构的Ｆｅ３Ｂ相，其晶格常数为ａ＝０．８７ｎｍ，ｃ＝０．４３９ｎｍ。在７００℃退火时出现面心立方结构的Ｆｅ３Ｂ６相，其晶格常数ａ＝１．０３９ｎｍ。在Ｆｅ（Ｓｉ）相中，含有约１７ａｔ％的Ｓｉ，在Ｆｅ２３Ｂ６中含有约１１ａｔ％的Ｓｉ和约４ａｔ％的Ｎｂ，而在ＦＥ３Ｂ中Ｓｉ和Ｎｂ含量均很少。     

铁基超微晶软磁合金的热处理特性研究

研究了Ｆｅ７４Ｃｕ１Ｎｂ（３Ｘ）ＭｏＸＳｉ１２５Ｂ９５（Ｘ＝０,１,２,３）系列合金的退火温度与软磁性能的关系。实验结果表明,最佳退火温度随Ｎｂ含量减少、Ｍｏ含量增加而降低;取得最佳直流磁性能和最佳交流磁性能的退火温度不同;无磁场退火和磁场退火取得最佳磁性能的退火温度不同。最佳温度退火得到的是晶态和非晶态复合结构,晶态组分是具有ＤＯ３超点阵结构的ｂｃＦｅ（Ｓｉ）相,平均晶粒直径１０～２０ｎｍ。     

Fe_(76.5-x)Cu_1Nb_xSi_(13.5)B_9的磁致伸缩

Ｆｅ７６．５－ｘＣｕ１ＮｂｘＳｉ１３．５Ｂ９的磁致伸缩样品为Ｆｅ７３．５Ｃｕ１Ｎｂ３Ｓｉ１６．５Ｂ６和Ｆｅ７６．５－ｘＣｕ１ＮｂｘＳｉ１３．５Ｂ９（ｘ＝２，３和５）。Ｆｅ７３．５Ｃｕ１Ｎｂ３Ｓｉ１６．５Ｂ６非晶带经５３０℃退火，其他成分样品的退火温度...     

Electrical conductivity of 1 : 1 and 2 : 1 clay minerals

The A.C. impedance plots were used as tools to analyze the electrical response of two varieties of Tunisian halloysite 1: 1 and illitic samples 2: 1 as a function of frequency at different temperatures (80–800°C). The real and imaginary parts of the complex impedance trace semicircles in the complex plane. Except for the illite, It-1, the second sample analyzed in this study, these plots give evidence for the presence of both bulk and grain boundary effect, above 600°C onwards. The bulk resistance of the materials decreases with the rise in temperature. Impedance Spectroscopy data reveal a non-Debye type of dielectric relaxation. The Nyquist plots show the negative temperature coefficient of resistance of both pure Tunisian illite and halloysite samples. The results of bulk electrical conductivity and its activation energy are presented for the two mineral clay samples. For illite It-1, the activation energy values estimated from the AC conductivity pattern and modulus pattern are very similar and suggest a possibility of a long-range mobility of charge carriers (ions) via hopping mechanism of electrical transport processes at higher temperature. On the other hand, for the halloysite sample provided from kasserine, (Ha-Kass), the modulus analysis admit that the electrical transport processes of the material are very likely of electronic nature. Relaxation frequencies follow an Arrhenius behavior with the activation energy values not comparable to those found for the electrical conductivity.     

20Cr1Mo1V1钢的分级时效工艺研究

研究了 2 0Cr1Mo1V1钢的强韧化工艺。所优化出的分级时效工艺能使其强度和韧性达到质保书的要求。     

A contribution to the crystallochemistry of ternary 1:1:1 and 1:1:2 rare earth intermetallic phases with Pb and Pd

The ternary alloys of the rare earths with lead and palladium were studied for the stoichiometric ratios 1:1:1 and 1:1:2 with respect to the structure of these alloys and their existence field. RPbPd (R = La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Y, Ho, Er, Tm, Yb) compounds have a hexagonal structure, hP9 Fe₂P type, while RPbPd₂ (R = Pr, Sm, Gd, Tb, Dy, Ho, Er, Yb) alloys have the cubic AlCu₂Mn-type structure (cF16, BiF₃ superstructure).     

Stabilization of extended stacking faults by {1 1 1}/{1 1 2} twin junction interactions

Extended stacking faults, with lengths of up to 10 nm, that join {1 1 1}/{1 1 2} twin-boundary junctions were observed by high-resolution transmission electron microscopy (HRTEM) in gold thin films. Circuit analysis shows that these defects possess a Burgers vector of 1/3〈1 1 1〉. In order to explain the generation of these extended defects, we consider the behavior of 1/3〈1 1 1〉 dislocations at {1 1 1}- and {1 1 2}-type twin boundaries and near {1 1 1}/{1 1 2} twin-boundary junctions using HRTEM observations and theoretical modeling. By establishing the interaction forces that lead to this defect configuration, our analysis shows that the relief of intrinsic strain at the junction corners, which results from the incompatibility of the translation states at the intersecting boundaries, is sufficient to stabilize the stacking fault extension. Because grain–boundary junctions possess intrinsic strain fields whenever they join boundaries with incompatible translation states, similar mechanisms for stacking fault emission may arise between other closely spaced grain–boundary junctions.     

有机阴离子转运多肽1B1的遗传药理学进展

人体存在多种类型的药物转运体,对于药物的吸收、分布和排泄起重要作用。参与药物跨膜转运的转运体功能受影响,将可能导致诸多临床药物的疗效、毒副作用甚至药物相互作用的发生。在各种影响因素中,遗传多态性所起的作用最为重要,可导致基因表达和蛋白功能发生改变。目前,阐明转运体基因的多态性以及基因型与表型之间的相互关系已成为应用遗传信息指导临床个体化用药的必要步骤。本文就肝脏有机阴离子转运多肽1B1(OATP1B1[OATP-C],编码基因SLCO1B1)基因多态性对药代动力学和药效动力学的影响及其临床意义等方面的进展作一综述。     

Variability in Co2 Oxidation Resistance of 2 1/4 Cr 1 Mo and 1 Cr 1/2 Mo Steels

Abstract

Oxidation tests in CO₂ atmospheres on nominally identical casts of low alloy steels have revealed wide variation in oxidation resistance. A study has been made of the influence of chemical composition, mechanical and thermal treatment, and remelting on the CO₂ oxidation behaviour of steels of the 21/4 Cr 1 Mo and 1 Cr 1/2 Mo type.

Statistical analyses of CO₂ oxidation results have shown a strong positive correlation of oxidation rate with sulphur content in certain instances, but a number of anomalies have been found. A similar relationship has been obtained between ‘MnS’ content and oxidation rate by area count studies of the inclusions in a range of 2 1/4 Cr 1 Mo steels. These have also indicated a possible effect of ‘MnS’ particle size and particle size distribution which could account for some of the anomalous results obtained in the statistical work. Conventional solid state heat treatments appear to have no significant effect on the oxidation behaviour of 2 1/2 Cr 1 Mo and while remelting in argon did not generally improve oxidation behaviour, remelting in vacuo followed by forging and rolling resulted in a material of high oxidation resistance.     

1Cr12Ni2W1Mo1V钢等离子淬火后的疲劳行为

采用模拟点蚀坑试样,研究了等离子淬火不同温度回火1Cr12Ni2W1Mo1V钢疲劳裂纹萌生和扩展行为.结果表明,由于等离子淬火的晶粒细化作用和在试样表面引入的残余压应力,提高了末级叶片用钢裂纹萌生抗力.比较两种回火温度试样试验结果,250 ℃回火试样裂纹萌生和扩展抗力均优于540 ℃回火试样.本研究结果为选择合适的热处理工艺提供了理论依据.     

1(1/4)Cr—(1/2)Mo耐热钢焊接工艺试验

本文介绍美国引进的1(1/4)Cr—(1/2)Mo耐热钢匹配以国产焊丝、焊条的工艺评定试验及现场工程应用。