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Abstract:通過(guò)淬火工藝制備了 4Ag I· Ag2 WO4材料 ,并使用 X射線衍射、熱示差等分析方法研究了該種材料的結(jié)構(gòu)和導(dǎo)電性。結(jié)果表明 ,4Ag I·Ag2 WO4材料是非晶態(tài)的玻璃 ,并具有很高的離子導(dǎo)電率。

Abstract:A criterion on the evaluation of thermodynamic data of binary and ternary intermetallic compounds is derived on the basis of the minimum free energy principle and the nature of convex downward surface. As an example, the Gibbs free energy of formation of ternary phase T (Mo 5Si 3C) in the system Mo Si C is estimated.

Abstract:The electrochemical properties of new type Ti 3Ni 2 hydrogen storage electrode have been studied in detail. It is shown that the largest discharge capacity of Ti 3Ni 2 electrode reaches 384 5 mAh/g at 353K and 145 5 mAh/g at 278 K (corresponding to Ti 3Ni 2H 3 7 and Ti 3Ni 2H 1 47 hydride respectively). At high temperature (353K) two plateaus of discharge curve appear, but at low temperature only one plateau. Compared with Ml (NiCoA1Mn) 5 electrode, the dynamics of Ti 3Ni 2 electrode is poor. The discharge capacity, dynamics and charge retentivity of Ti 3Ni 2 electrode are improved greatly at high temperature.

Abstract:利用擠壓鑄造法制備了 Al2 O3纖維增強(qiáng) Al合金復(fù)合材料 ,對(duì)其界面孔隙率進(jìn)行了測(cè)定 ,結(jié)合拉伸強(qiáng)度數(shù)據(jù) ,討論孔隙率對(duì)復(fù)合材料強(qiáng)度的影響 ;并通過(guò)有限元計(jì)算 ,分析了與拉伸軸平行、成 45°及與拉伸軸垂直的 3種纖維模型 ,得出纖維、基體、界面處應(yīng)力分布。

Abstract:Mm (NiCoMnAl) 5 alloy has been treated by buffer solution at room temperature, and the electrochemical performances of the alloy have been investigated. The results show that the activation behavior, initial discharge capacity and cycling stability of the alloy treated by buffer solution (pH=4 5) for 2 h are improved.

Abstract:Effect of additive CeO 2 on thermal shock resistance of plasma sprayed ZrO 2 coating has been investigated using SEM, EPMA and thermal shock tests. As mass fraction of additive CeO 2 increases 0 to 9 0%, the lifetimes of fracture initiation and fracture failure increase 32 and 46 cycles to 76 and 105 cycles respectively. Net shaped microcracks well distributed in ZrO 2+9 0% CeO 2 coating resulted in decreasing stress and critical temperature of fracture initiation in coating, so the thermal shock resistance increases.

Abstract:Nanocrystalline Yb 2O 3 of various particle sizes was prepared using sol gel method. XRD analysis shows that the prepared nanocrystalline Yb 2O 3 is cubic in structure with space group Ia3. TEM photographs indicate that Yb 2O 3 nanoparticles are basically spherical in shape. Calculation of crystallite size indicates that the average crystallite size of Yb 2O 3 increases with increasing calcination temperature, but the average crystal lattice distortion rate decreases with increasing calcination temperature and crystallite size. This reault shows that the smaller the crystallite size, the bigger the crystal lattice distortion, and the worse crystal growth. Solubility test of Yb 2O 3 in nitric acid shows that the surface activity of Yb 2O 3 increases with decreasing crystallite size. Fourier Transform Infrared Spectrometer (FTIR) spectra reveal that nanocrystalline Yb 2O 3 has higher surface activity than that of ordinary Yb 2O 3. Absorbance intensity of Yb O bond of nanocrystalline Yb 2O 3 is weaker than that of ordinary Yb 2O 3, and the absorbance of Yb O bond of nanocrystalline Yb 2O 3 is small blue shifted.

Abstract:The rare earth solid superacid SO 2- 4/TiO 2/La 3+ was prepared. The synthesis of diethyl sebacate has been studied using ethanol absolute and sebacic acid as reactants, and rare earth solid superacid SO 2- 4/TiO 2/La 3+ as catalyst. The influence factors of reaction were investigated. The results show that it is a good catalyst for esterifications.

Abstract:The developmental history and fields of application of magnetostrictive materials are presented. The various characteristics of the materials are compared with that of piezoelectric(PZT) material P b(Zr, Ti)O 3. Some research works on ultraprecise micromoving actuator and optic fiber magnetoelastic sensor in Wuhan University of Technology are reported. The application situation of the materials in the future is also discussed.

Abstract:通過(guò)淬火工藝制備了4AgI

Abstract:根據(jù)最小自由能原理和向下凸曲面性質(zhì)推導(dǎo)出估算三元系和二元系金屬間化合物熱力學(xué)數(shù)據(jù)的判斷式，并以Mo-Si-C三元系為例，估算了三元相T（Mo5Si3C）的Gibbs生成自由能。

Abstract:The kinematics of particulate drop in plasma is studied, and the velocity equations of particulate drop are provided. The experimental study of kinematics of SiGe alloy particulates has been carried out. The results indicate that for increasing the purity effect, the drop time of the particulates must increase, and the particulate velocity must decrease. This study could be applied to fabrication of high purity materials by cold plasma.

Abstract:The fracture mechanism of fully lamellar Ti 49at% Al alloy has been investigated by studying the interactions between crack and lamellae or grain boundary. The results indicate that the nucleation and propagation mechanism of crack depend on not only lamellar orientation in grain but also the type of grain boundary. As the angle between tensile axis and lamellae is relatively large, main cracks propagate by nucleation, growth and linkage with interfacial microcracks. As the tensile axis is nearly parallel to the lamellae, translamellar cracks propagate by nucleation, growth and linkage with two types of microcracks, e g interface delamination and translamellar microcracks. Different types of grain boundary have different toughening effects on TiAl alloy, that is, interlock grain boundary nearly parallel to the tensile axis is beneficial to fracture toughness, and the grain boundary nearly perpendicular to the tensile axis is not beneficial.

Abstract:研究了Ti-48Al (0.2～0.8)at%B合金中硼化物的生長(zhǎng)機(jī)理。結(jié)果顯示：合金中的硼化物均為C32結(jié)構(gòu)的TiB2相；在加入0.2at%和0.5at%B的合金中只存在帶狀TiB2相；而加入0.8at%B的合金中除帶狀TiB2相外，還出現(xiàn)了少量六方形貌的塊狀TiB2相，塊狀硼化物是從液相中自由生長(zhǎng)的初生TiB2相，其慣習(xí)面為（0001）基面和｛10∧-10｝柱面；而帶狀硼化物則是次生TiB2相，是通過(guò)L→β TiB2和L β→α TiB2反應(yīng)與基體耦合生長(zhǎng)的非規(guī)則共晶反應(yīng)產(chǎn)物。兩種形貌的TiB2顆粒均以臺(tái)階方式生長(zhǎng)。

Abstract:研究了新型儲(chǔ)氫合金電極Ti3Ni2的電化學(xué)性能。實(shí)驗(yàn)結(jié)果表明：Ti3Ni2合金電極的最大放電容量達(dá)到384.4mAh/g(353K),相當(dāng)于Ti3Ni2H3.7。在278K，最大容量為145.5mAh/g，相當(dāng)于Ti3dNi2H1.47。高溫條件下（353K）放電曲線有2個(gè)平臺(tái)，在溫度比較低時(shí)，放電曲線只有1個(gè)平臺(tái)，與Mι（NidCoMnAl）5合金相比，Ti3Ni2合金電極的動(dòng)力學(xué)性能不好， 此外，溫度對(duì)Ti3Ni2合金電極的電化學(xué)性能影響明顯。在溫度比較高的條件下，合金的放電容量，動(dòng)力學(xué)特性、荷電保持能力均有大幅改善。

Abstract:The crevice corrosion of the benzotriazole(BTA) passive specimens of the shape memory alloy Cu Zn Al in Hank's artificial body fluid has been studied using electrochemical tests. The results show that the shape memory alloy Cu Zn Al exhibits better property than the annealed alloy Cu Zn Al. The reason is that the martensite single phase in the alloy Cu Zn Al improves electrochemical property and inhibits active solution. The occurring of crevice corrosion is attributed to the metal ions concentration cell. BTA passivation improves the crevice corrosion resistance of the alloy.

Abstract:研究了Ti0.8Zr0.2Mn2-xCrx(x=0.2,0.4,0.6,0.8和1.0）系、Ti0.9Zr0.2Mn1.8V0.2和Ti0.9ZrxMn1.8-yCryV0.2(x=0.1,0.15和0.2);y=0.2和0.4）系A(chǔ)B2型Ti-Mn基合金的儲(chǔ)氫性能和晶體結(jié)構(gòu)。結(jié)果表明：Zr元素對(duì)A側(cè)Ti的部分置換和A側(cè)過(guò)化學(xué)計(jì)量可顯著提高合金的活性性能及吸放氫量。這些合金的主相均為C14型Laves相，其儲(chǔ)氫量隨點(diǎn)陣參數(shù)a,c和晶胞體積V的增加而提高，當(dāng)a≥0.4894nm,c≥0.8040nm或V≥0.1668nm∧3時(shí)，儲(chǔ)氫量可達(dá)到235ml/g以上。

Abstract:對(duì)高度穩(wěn)定化β型阻燃鈦合金Ti40的氧化機(jī)理和氧化層剝落機(jī)理進(jìn)行研究表明：合金氧化增重隨溫度升高明顯增加，至1050℃反而降低；600℃的氧化膜主要為TiO2和V2O5，高于700℃氧化，因V2O5的揮發(fā)，氧化膜主要為TiO2，隨溫度升高，氧化物晶粒粗化，氧化膜疏松多孔，與基體黏附性降低，不低于900℃時(shí)開裂和剝落，不低于800℃氧化，氧化層疏松還存在SiO化合物，溫度升高，SiO數(shù)量增多，由圓形球變?yōu)樾切危?050℃隨氧化層剝落而消失；剝落后的基體氧化層仍為疏松狀，有不連續(xù)分布的Cr2O3膜存在，同時(shí)還分析了Ti40合金不抗氧化的原因及氧化機(jī)理，提出了氧化機(jī)理模型。在分析氧化膜內(nèi)應(yīng)力產(chǎn)生及內(nèi)應(yīng)力釋放機(jī)制基礎(chǔ)上，提出了Ti40合金氧化層開裂、剝落機(jī)理。

Abstract:利用擠壓鑄造法制備了Al

Abstract:對(duì) Cu- Al合金的內(nèi)氧化工藝及其動(dòng)力學(xué)進(jìn)行了系統(tǒng)研究。結(jié)果表明 :本實(shí)驗(yàn)條件下以 12 2 3K,0 .5 h內(nèi)氧化工藝所得材料的性能最佳 ,其顯微組織特征是 Cu基體上均勻彌散分布著納米級(jí) γ- Al2 O3粒子。理想條件的內(nèi)氧化初期和實(shí)際條件下的內(nèi)氧化動(dòng)力學(xué)曲線服從拋物線規(guī)律。溫度、時(shí)間、Cu- Al合金粉顆粒半徑和 Al濃度是實(shí)際內(nèi)氧化控制的 4要素 ,它們間的函數(shù)關(guān)系近似滿足下式 :t=6 .79R2 CBexp(2 32 5 1/T)。實(shí)際內(nèi)氧化時(shí)間不宜過(guò)長(zhǎng) ,內(nèi)氧化溫度應(yīng)該 :112 3K

Abstract:A Ni B coating was prepared using chemical plating. XRD analysis shows that the microstructure of as coating is a mixture of amorphous and supersaturated solid solution. The microstructural transformation and properties of the coating for different heat treatment conditions are discussed in details. Ni 2B formed during high temperature ageing. Room temperature ageing was also observed. The age hardenability depends on existence and quantity of Ni 2B, and the transformation mode from Ni 2B to Ni 3B.

Abstract:Effect of cerium content on phase structure, electrochemical properties and pressure concentration temperature ( P C T ) characteristics of Ml (NiCoAlMn) 5 alloy ( Ml =Michmetal) has been investigated. Experimental results indicate that as cerium content increases, the lattice constants ( a,c ), cell volume ( V ) and axis ration ( c/a ) of the alloy decrease; the elemental segregation in dendrite increases; the discharge capacity decreases; the cycling stability increases; the plateau pressure of P C T curve increases. The alloy with 15 at% Ce has optimum comprehensive electrochemical properties.

Abstract:采用室溫下緩沖溶液的浸漬處理方法對(duì)Mm(NiCoMnAl）5 合金進(jìn)行表面改性，研究了緩沖溶液pH值和浸漬處理時(shí)間對(duì)合金電化學(xué)性能的影響。試驗(yàn)結(jié)果表明：采用pH值為4.5的緩沖溶液浸漬處理2h可以改善Mm(NiCoMnAl）5合金的活化性能，初始放電容量和循環(huán)穩(wěn)定性，但對(duì)高倍率放電性能的改善作用并不明顯。

Abstract:CaCuO 2 content has been optimized for two powder process. The experimental results indicate that as precursor powders have 5% excessive CaCuO 2, the critical current density of tape increases about 10%. During the reaction process, excessive CaCuO 2 afford enough liquid phase which accelerate the 2223 phase formation, but too much CaCuO 2 (>15%) will produce impure phases at grain boundary. Large impurity particles decrease the texture degree of the 2223 phase and critical current density of the tape.

Abstract:The effects of bonding materials on electrochemical characteristics of amorphous Mg Ni alloy electrodes have been investigated. The experimental results show that there are a little differences between the electrodes used Cu and/or Ni as bonding materials due to comprehensive effects of corrison resistence, internal electrical resistance and catalytic properties of the materials. As Co is used as bonding material, the electrochemical capacity and degradation of the electrode are improved greatly.

Abstract:采用SEM，EPMA和熱震方法，研究了CeO2添加劑對(duì)等離子噴涂ZrO2i涂層抗熱震性能的影響。結(jié)果表明：當(dāng)CeO2由0增加到9.0%（質(zhì)量分?jǐn)?shù)，下同）時(shí)，涂層的抗熱震起裂次數(shù)和失效次數(shù)分別由32次和46次增加到76次和105次；繼續(xù)增加CeO2，涂層的抗熱震性能急劇下降。ZrO2 9.0?O2涂層在熱循環(huán)中形成的網(wǎng)狀微裂紋，不僅可降低涂層中的應(yīng)力，也可提高涂層開裂的臨界溫差，從而可改善其抗熱震性能。

Abstract:用溶膠-凝膠法制備了不同粒徑的Yb2O3納米晶。XRD分析表明：所合成的Yb2O3納米晶屬于立方晶系，空間群為Ia3。TEM分析表明：所合成的Yb2O3粒子基本呈球形。計(jì)算表明:Yb2O3的平均晶粒度隨焙燒溫度的升高而增大，而平均晶格畸變隨焙燒溫度的升高和晶粒度的增大而減小，表明晶粒越大，晶格畸變?cè)酱?，微晶發(fā)育越不完整。溶解性試驗(yàn)表明：Yb2O3晶粒度減小，表面活性增加。FTIR光譜分析表明：納米Yb2O3比普通的Yb2O3具有更高的表面活性，Yb-O鍵的吸收強(qiáng)度減弱，有微小的藍(lán)移。

Abstract:制備了稀土固體超強(qiáng)酸SO∧2-4/TiO2/La∧3 ，研究了以其為催化劑，葵二酸和無(wú)水乙醇為原料合成葵二酸二乙酯，并考察了影響反應(yīng)的因素。結(jié)果表明，它是一種良好的酯化催化劑。