La 对非晶 Ni_(63)Zr_(37)合金表面状态的影响

采用俄歇电子能谱和 X 射线光电子能谱,并结合氩离子原位溅射剥层研究了非晶 Ni_(63)Zr_(37)及Ni_(63)Zr_(32)La_5合金条带自由侧和贴辊侧的表层成分分布及元素的化学状态。结果表明,非晶 Ni_(63)Zr_(37)合金条带贴辊侧氧化层较自由侧厚且 Zr 的表面偏聚较为显著;加入 La 后,显著地改变了 Ni_(63)Zr_(37)合金条带两侧的表面状态;在合金条带表面及近表面,Ni 以金属态弥散分布在 Zr 和 La 的氧化物上,其电子状态受氧化物的影响;条带表层 Zr 的氧化物由 ZrO_x(1相似文献   

液淬条件对非晶态合金制备脆化和晶化的影响

研究了用单辊法制备非晶态合金条带时，冷却辊表面线速、熔体射流压力、喷射距离等参数对非晶态Ｆｅ３０Ｂ１１．４Ｓｉ３．５合金条带的形成、条带结构、性能及其退火脆化和晶化的影响。液淬工艺参数的合理配合下获得的足够高的液淬速率是得到非晶结构的关键，也是制备质量条带的决定因素。液淬速率愈高，条带厚度愈小，其脆化敏感性愈低。因此，高液淬速率下薄带的制备，有益于提高非晶态合金脆化抗力。非晶合金的晶化与液淬条件之间不存在直接的联系。     

Fe,Ni掺杂(Zr,Sn)TiO4陶瓷的结构和介电性能

用电子陶瓷工艺制备主晶相为(Ｚｒ,Ｓｎ)TiO₄的介电陶瓷,(Ｚｒ;Ｓｎ)TiO₄的结构属正交晶系,空间群Ｐｂｃｎ．研究用Ｆｅ,Ｎｉ掺杂对(Ｚｒ,Ｓｎ)TiO₄陶瓷的介电性能的影响:铁掺杂降低了瓷料的烧结温度,同时减小了系统的Ｑ值(Ｑ＝１/ｔｇδ);但在一定的范围内,随着Ｎｉ掺杂量的增大,Ｑ值的下降被抑制,这可能是因为Ｎｉ离子阻碍了Ｆｅ离子扩散进入晶粒,使得Ｆｅ离子富集在晶界上,形成Ｆｅ－Ｎｉ尖晶石结构,减少了Ｆｅ对Ｑ值的影响．     

SmDyFeCo磁光薄膜的制备和性能研究

本文采用射频磁控溅射方法制备了ＳｍＤｙＦｅＣｏ非晶磁光薄膜。研究了氩气压、溅射功率对ＳｍＤｙＦｅＣｏ薄膜性能的影响。实验表明，反射率随氩气压升高而降低。矫顽力随氩气压升高而逐渐增大，达到一定值时克尔回线反向，随后矫顽力又逐渐减小。高气压下的矫顽力温度特性较低气压下的矫顽力温度特性要好，但氩气压进一步升高，磁光克尔回线矩形度变差。本征磁光克尔角随氩气压升高而增大，到达最大值后又逐渐减小。反射率随溅射     

自蔓延高温合成TiC—Al2O3—Fe系金属陶瓷的致密化研究

采用ＳＨＳ／ＰＨＩＰ工艺制备了致密的ＴｉＣ－Ａｌ２Ｏ３－Ｆｅ系金属陶瓷，研究了延迟时间，高压特续时间，压力及Ｆｅ含量对合成ＴｉＣ－Ａｌ２Ｏ３－Ｆｅ金属陶瓷实度的影响，结果表明，采用ＳＨＳ／ＰＨＩＰ技术制备了ＴｉＣ－Ａｌ２Ｏ３－Ｆｅ系金属陶瓷时，合成产物中气体的排放，液相的存在及组成相之间的润湿性是制备密实材料的关键。     

H原子对固态合金化颗粒表面成份分布影响的研究

本文研究了氢化物ＴｉＨ２对Ｆｅ＋Ｔｉ机械合金化非晶储氢合金的表面成份偏聚和性能的影响。应用Ｘ射线光电子谱（ＸＰＳ）和俄歇电子谱（ＡＥＳ）对样品表面由表及里逐层测量成份分布。同时应用热重分析方法研究了样品氧化性能和产物。研究结果表明，在机械合金化过程中，Ｈ原子不仅能使ＦｅＴｉ非晶化，同时促使表面产生明显的Ｆｅ原子偏聚。表面Ｆｅ／Ｔｉ原子比接近７。非晶ＦｅＴｉ（Ｈ）相的氧化分两个阶段进行，Ｔｉ原子首先氧化（８３３Ｋ），随后Ｆｅ原子氧化（８９０Ｋ）。     

SmDyFeCo磁光薄膜的磁特性研究

采用射频磁控溅射方法制备了ＳｍＤｙＦｅＣｏ非晶磁光薄膜，研究了氩气压，溅射功率对ＳｍＤｙＦｅＣｏ薄膜磁特性的影响。实验表明，和ＤｙＦｅＣｏ非晶薄膜相比，ＳｍＤｙＦｅＣｏ非晶薄膜的矫顽力Ｈｃ随温度变化更为缓慢，并且具有更大的垂直磁各向异性常数，因而具有更好的记录特性，本征磁光克尔角可达０．３１，可以作为一种实用化的磁光记录介质。     

某些氟化物的升华提纯 Ⅱ．ZrF_4和HfF_4的升华提纯

尽管升华方法在除去氧化物方面很有成效，但也必须注意ＺｒＦ４和ＨｆＦ４的水解温度和脱水温度．由于升华方法不能有效地除去象ＦｅＦ３等氟化物杂质．作者根据ＦｅＦ６３－，ＣｏＦ６３－是属于外轨道络合物，它们是不稳定的和容易离解出Ｆｅ３＋和ＣＯ３＋，同时ＦｅＺｒＦ６·６Ｈ２Ｏ也易于离解出Ｆｅ２＋，以致使（ＮＨ４）３ＺｒＦ７和（ＮＨ４）３ＨｆＦ７可以用ＤＤＴＣ－ＣＨＣｌ３，在ｐＨ３～３．５的有效萃取成为可能．在ＺｒＦ４－ＨｆＦ４的二元组分系统中，它们的升华、凝华过程是遵循图２的相平衡规律进行的．用ＸＲＤ检测升华产品，为无水单斜态的ＺｒＦ４或ＨｆＦ４晶体，用ＧＦＡＡＳ检测，升华前后Ｆｅ含量各自为０．８ｐｐｍ和０．５ｐｐｍ，批生产量２５０ｇ．     

不同温度热硫化纯Fe膜制备FeS2薄膜的研究

研究了在硫化压力为８０ｋＰａ、等温２０ｈ条件下，硫化温度对磁控溅射制备的纯Ｆｅ膜反应形成ＦｅＳ２多晶薄膜的影响。结果表明，在４００￣６００℃范围内，薄膜中反应生成ＦｅＳ２过程比较充分，尤其在４００℃硫化时，可以获得接近理想化学计量成分的、具有细小均匀组织形态的ＦｅＳ２薄膜。当温度超过４００℃后，ＦｅＳ２晶粒尺寸明显增大，但亚晶尺寸保持恒定。     

重力分离SHS法制备陶瓷内衬复合钢管耐蚀性的研究

基于重力分离ＳＨＳ法制备了陶瓷内衬复合钢管，分析了内衬陶瓷层的组织结构及添加剂ＳｉＯ２和ＣｒＯ３对复合钢管耐蚀性的影响。研究发现，内衬陶瓷层主要由构成枝晶的α－Ａｌ２Ｏ３基体相和分布于其间的ＦｅＯ·Ａｌ２Ｏ３尖晶石相所组成，ＳｉＯ２主要以石英相结构存在于枝晶晶界中。在Ｆｅ２Ｏ３＋Ａｌ＋ＳｉＯ２体系中，陶瓷层的腐蚀主要为晶间腐蚀，并在ＳｉＯ２添加量为４％ｗｔ时，复合钢管的腐蚀失重率出现极大值（约为１     

Surface Characterization of Ni_(64)P_(20)Fe_(16)Amorphous Alloy by X-ray Photoelectron Spectroscopy and Auger Electron Spectroscopy

The nature of the native oxides formed on thesurface layer of amorphous alloy Ni_(64)P_(20)Fe_(16)hasbeen studied by X-ray photoelectron spectroscopy(XPS)and Auger electron spectroscopy(AES)withdepth profiling by ion bombardment.There aregreat distinctions in compositions and chemicalstates between the surface layer and the bulk.Themain constituents Ni,P and Fe are lower in the sur-face layer,and they are mostly in oxidized states,whereas C,O and N are enriched in the surface lay-er.The thickness of surface oxide layer isapproximately 20 nm,this layer was assumed to beof great significance to various properties of amor-phous alloy Ni_(64)P_(20)Fe_(16),expecially to the chemicaland catalytic properties.Experiments proved thattransitional element Fe cannot improve oxidationresistance of the amorphous Ni-P system.     

退火处理Fe(Co)Al(Zr)O系薄膜磁性能的研究

采用射频磁控溅射装置在氩气氛下制备了Fe(Co)Al(Zr)O系薄膜.用X射线衍射仪、透射电镜及其选区衍射来分析薄膜的微结构.用振动样品磁强计、磁导计等测量了矫顽力Hc、饱和磁化强度Ms及磁导率等磁性参数.通过退火处理研究了Fe(Co)Al(Zr)O系薄膜的磁性能.Fe(Co)Al(Zr)O系薄膜磁各向异性是由形状各向异性引起的.     

Formation of amorphous anodic oxide films of controlled composition on aluminium alloys

Binary, non-equilibrium Al-29at%Nb, Al-44at%Ta, Al-19at%Ti, Al-25at%Ti and Al-32at%Zr alloys were prepared by magnetron sputtering and subsequently anodized at high Faradaic efficiency to grow barrier-type anodic films. Examination in the transmission electron microscope revealed amorphous anodic films of relatively uniform compositions across the film thicknesses, except for a layer of relatively pure alumina, of about 5% of the film thickness, present at the film/electrolyte interface of the Al-Ta alloy. The film compositions, from Rutherford backscattering spectroscopy, indicate that the alloy constituents are oxidized in their alloy proportions to form films comprising intimately mixed units of the various oxides, namely alumina, niobia, titania, tantala and zirconia. The films grow by co-operative transport of metal and oxygen ions under the electric field with formation of film material by both migration of metal ions outwards and of oxygen, and possibly hydroxyl, ions inwards. The average migration rates of Al³⁺, Nb⁵⁺, Ti⁴⁺ and Zr⁴⁺ ions are similar, to within 10%, but Ta⁵⁺ ions migrate more slowly than Al³⁺ ions. The results of the study show that a wide range of compositions of amorphous oxide films can be readily formed by anodic oxidation of appropriate alloys, including compositions containing units of normally crystalline anodic oxides, namely TiO₂ and ZrO₂.     

X-ray photoelectron spectroscopy analyses of titanium oxynitride films prepared by magnetron sputtering using air/Ar mixtures

X-ray photoelectron spectroscopy (XPS) has been employed to investigate titanium oxynitride (TiN_xO_y) films prepared by d.c. magnetron sputtering using air/Ar mixtures, which allows one to perform the deposition at a high base pressure (1.3 × 10^− 2 Pa) and can reduce substantially the processing time. XPS analyses revealed that all the prepared TiN_xO_y films comprised Ti-N, Ti-N-O, and Ti-O chemical states. When the air/Ar ratio was below 0.3, nitrogen-rich TiN_xO_y films were obtained. As the air/Ar ratio was above 0.4, oxygen-rich TiN_xO_y films were formed. XPS depth profile analyses were also performed in selected specimens. It has been found that at relatively low air/Ar ratios, such as 0.5, the oxygen content of the films increased toward the film/substrate interface and when the air/Ar ratio was higher, TiN_xO_y films with large oxygen content with uniform concentrations were then formed.     

Transmission electron microscopy investigation of Zr2(Fe,Ni) particles incorporated in the oxide film formed on a Zirconium alloy

An analytical electron microscopy has been used to investigate the microstructural oxide of Zr₂(Fe,Ni) particles incorporated into the oxide film formed on the alloy ZrSnNbFeCrNi. The alloy has been oxidized in 18.6 MPa lithiated water at 360 °C for 14 days forming an oxide scale of thickness around 1.2 μm. The results indicate: (i) the oxidation of Zr₂(Fe,Ni) particles is faster than that of Zr(Fe,Cr)₂ particles, accompanied by the diffusion of Fe and Ni out of the Zr₂(Fe,Ni) particles to the surrounding ZrO₂ matrix and; (ii) the oxidation products for Zr₂(Fe,Ni) particles mainly comprise amorphous oxide along with cubic, tetragonal and monoclinic ZrO₂. The behavior of Zr₂(Fe,Ni) particles during oxidation is discussed.     

一种测量超微粒子表面氧化层厚度的新方法

通过XPS分析与Ar~ 刻蚀相结合的方法，测量了Fe_(50)Pd_(50)合金超微粒子（UFP）的表面氧化层厚度，发现它的表面氧化层为1．4um厚，小于电镜观察到的表面非晶层厚度，表明此方法测量的表面氧化层厚度不受表面吸附层的影响，并且能直接了解UFP表面的具体氧化状态。     

Magnetic properties and surface crystallization induced by selective oxidation in Fe-B-Si amorphous alloy

The relationship between the annealing atmosphere and the magnetic properties of Fe_78.5B₁₃Si_8.5 amorphous alloy has been studied, showing that annealing in nitrogen, argon, hydrogen and air significantly improved the iron loss of the amorphous ribbon, giving much better results than annealing in an H₂ + H₂O atmosphere. A boron-depletion zone with the alloy composition O to 3 mol % B and 9 to 11 mol% Si was detected by Auger electron spectroscopy under the oxide film formed during annealing in H₂ + H₂O. The iron crystalline phase is formed only on the ribbon surface after annealing in H₂ + H₂O. A mechanism is proposed explaining the deleterious effect of annealing in the H₂ + H₂O, whereby the H₂O in this atmosphere selectively oxides boron in the amorphous alloy to form a B₂O₃ film and the boron-depletion zone, and the alloy in this zone is then crystallized into -Fe. This surface crystalline layer induces out-of-plane magnetic anisotropy in the amorphous alloy ribbon (which was observed by transmission Mössbauer spectroscopy) and thus deterioration of the iron loss.     

Natural Passivity of Amorphous Fe_(40)Ni_(40)P_(14)B_6 and Fe_(54.6)Ni_(38)Si_(4.1)B_(2.3)V_1 Alloys

The natural passive films forrned on Fe_(40)Ni_(40)P_(14)B_6 and Fe_(54.6)Ni_(38)Si_(4.1)B_(2.3)V_1 amorphous alloys long-term exposed in air have been studied by X-ray photoelectron spectroscopy (XPS) and Auger electron (including Ar+ ion depth profiling) spectroscopy (AES). The following aspects have been investigated: (1) chemical states of the elements in the films. binding energies and the chemical shifts measured by XPSf (2) structure and composition of the films fand (3) thickness of the passive films determined by AES depth profiling and XPS analysis.     

添加Zr、Co、B元素对ThCu_7型Sm-Fe合金结构的影响

采用SEM、XRD、EDX等方法分析了添加合金元素B、Zr、Co前后Sm-Fe合金铸锭的微观结构及快淬条带中的相组成.研究表明,添加合金元素B、Zr、Co前后,Sm-Fe合金铸锭均由Sm2Fe17相、富Sm相和α-Fe相组成,添加B可促使铸锭晶粒细化,富Sm相由块状向条状变化,添加Zr、Co可使铸锭晶粒进一步细化,富Sm相进一步条状化.添加合金元素B、Zr、Co前,Sm-Fe合金仅在快淬速度达到30m/s时得到ThCu7型六角晶结构的Sm10Fe90相及少量α-相;添加B、Zr、Co元素后,在不同快淬速度下合金均可得到单一的ThCu7型六角晶结构的Sm10Fe90相及部分非晶相.添加Zr、Co元素后,快淬条带晶粒进一步细化.当Zr、Co元素含量一定时,随快淬速度的加快,其晶胞体积呈先升后降的趋势,同时快淬条带中的非晶相逐渐增加,Sm10Fe90相逐渐减少.