最新色国产精品精品视频,中文字幕日韩一区二区不卡,亚洲有码转帖,夜夜躁日日躁狠狠久久av,中国凸偷窥xxxx自由视频

Abstract:采用熱重-差熱(TG-DTA)與氣-質(zhì)聯(lián)用(GC-MS)研究了CVD技術(shù)制備鈀膜材料的前驅(qū)體乙酰丙酮鈀[Pd(acac)2]的熱分解行為。通過對比其在空氣和氬氣兩種氣氛、不同溫度下的熱裂解產(chǎn)物,認(rèn)為在以乙酰丙酮鈀為前驅(qū)體通過CVD技術(shù)制備鈀膜時,空氣比氬氣更適合做載氣。

Abstract:研究了Ti-45Al-5Nb（at％）和Ti-45Al-5Nb-0．3Y（at％）合金的鑄態(tài)顯微組織。結(jié)果表明：稀土Y的添加改變了Ti-45Al-5Nb合金的鑄態(tài)顯微組織，促進(jìn)了等軸晶粒的形成，極大地細(xì)化了晶粒；稀土Y主要富集在等軸晶粒的晶界處，并呈斷續(xù)網(wǎng)絡(luò)狀分布，還有極少量的稀土呈小顆粒分布在晶粒內(nèi)部；與Ti-45l-5Nb合金相比，Ti-45Al-5Nb-0．3Y合金除了γ和α2相外，還形成了富集Al和Y的富稀土 相-YAl2相；在合金凝固過程中，稀土Y能夠提高TiAl合金的形核率，同時稀土Y在固液界面前沿的富集抑制了初生聲相的生長，并且后者對晶粒的細(xì)化起主要作用。

Abstract:采用X射線衍射、SEM、EDS等分析方法，研究了鐵元素對光束堆焊合成NiAl金屬間化合物層的成形和組織結(jié)構(gòu)的影響規(guī)律。結(jié)果表明，光束堆焊鎳鋁混合粉制備NiAl金屬間化合物層時，NiAl的高熔點導(dǎo)致堆焊層成形困難。在鎳鋁混合粉中加入適量鐵粉（11at％～28at％）可以降低堆焊合金體系的熔點、改善堆焊層成形。隨著鐵粉加入量的增加，堆焊層的稀釋率呈現(xiàn)先增加后降低的趨勢，過多的鐵粉加入量（43at％）將使熔池金屬不能潤濕母材。鐵元素的引入使堆焊層中析出了Fe3Al相，隨著堆焊層中含F(xiàn)e量的增加，F(xiàn)e3Al的析出量增加，堆焊層的微觀組織為NiAl柱狀晶和柱狀晶間的Fe3Al條狀相。

Abstract:采用循環(huán)伏安電沉積技術(shù)在鈦基上獲得水合氧化釕(RuOx·nH2O),其比容量為105F/g。通過電化學(xué)測試(循環(huán)伏安、恒電流充放電)、X射線衍射(XRD)、掃描電鏡(SEM)以及X射線光電子能譜(XPS)等方法研究了沉積物的電化學(xué)性質(zhì)、物相及組成。結(jié)果表明:電沉積法獲得的水合氧化釕呈非晶態(tài)結(jié)構(gòu),它由多氧化態(tài)釕混合羥基氧化物組成。在1.0mol·L-1H2SO4溶液中,該氧化物呈準(zhǔn)電容特征,有較高電化學(xué)可逆性,可用作電化學(xué)電容器電極材料。

Abstract:采用基于有限元反射模型的SFS（shape from shading）算法對鋯-4合金低周疲勞斷口進(jìn)行三維重建，定量描述了斷口表面的三維形貌。然后，根據(jù)小島法的基本理論，研究了斷口三維形貌的分維計算方法，計算了一系列平行于斷口表面的分維值。結(jié)果表明：在40％～60％高度范圍內(nèi)，根據(jù)小島法作出周長L（η）-面積A（η）在雙對數(shù)圖上呈近似直線關(guān)系，表明Zr-4合金斷口具有良好的分形特征；分形維數(shù)D變化范圍為1．5809～1．6450，平均值1．603l，標(biāo)準(zhǔn)差0．0237。表明在此切割高度范圍內(nèi)，高度對分維值影響較小。

Abstract:在電子探針測量的基礎(chǔ)上,根據(jù)擴散理論和Ir-Re相圖數(shù)據(jù),建立了一個全新的Ir/Re兩相擴散模型。計算得到在1200℃~2000℃時Ir基固溶體中的互擴散系數(shù)為:D=1.17×10-6exp(–1.80eV/kT)(cm2/s),Re基固溶體中的互擴散系數(shù)為:D=1.36×10-8exp(–1.21eV/kT)(cm2/s)。確定噴管中Ir/Re為晶界擴散。

Abstract:Such experimental researches as XRD, SEM and TEM were conducted on the synthesized ceramic heat-resistant gradient material of TiC-Mo/W system prepared by combining SHS with the new method of HP. The result of XRD shows that the reaction product is no other than TiC and Mo/W. TEM analysis finds that TiC ceramic particle becomes a ellipsoidal distribution, tiny and relatively even particle, with Mo/W metal phase in-between; SEM indicates that the shape of multi-metal phase appears to be island-like and distributes in continuous gradient clouds. The compacting density, bending strength, fracture toughness and rigidity value of the synthesis can be prepared to be applicable gradient material structure under suitable pressure and temperature. In the course of SHS/HP, Mo/W distributes into ceramics TiC in the manner of gradient clouds along the sample grade direction. According to the research, the characteristics of the material is anisotropic and transversally isotropic along the direction and vertical grade direction respectively.

Abstract:研究了鎂基復(fù)合材料超塑性變形過程中SiC晶須織構(gòu)的演化規(guī)律,并分析了其對孔洞行為的影響。超塑性拉伸試驗在613K~723K,8.3×10-4s-1~8.3×10-2s-1條件下進(jìn)行。在613K,1.67×10-2s-1初始應(yīng)變速率下,獲得了200%的延伸率。SiC晶須在超塑性變形過程中發(fā)展出強烈的<111>//ED纖維織構(gòu)。SiC晶須的這種取向?qū)Ы缁瑒佑凶璧K作用,不僅使孔洞易于萌生,也加速了其長大與連接。

Abstract:A newly developed cost-effective processing route, in situ reactive infiltration technique, was utilized to fabricate 47.5vol.%TiC/AZ91D magnesium matrix composites. A comparative study was made on the tensile deformation behavior at room and elevated temperatures for the as synthesized composites and the matrix alloy magnesium AZ91D and their fracture characteristics were also analyzed as well. The results show that the TiC/Mg composites fabricated by in situ reactive infiltration process possess excellent high-temperature mechanical properties. The ultimate tensile strength of the matrix magnesium alloy AZ91D at 723 K and a strain rate of 0.001 s^-1 is 41.1 MPa, while that of TiC/Mg composites at the same deformation conditions increases by 120% and reaches 91.1 MPa. At room temperature, the ultimate tensile strength of the composites increases only by 23.4% as compared with the AZ91D alloy. The SEM observation of the morphologies for the fractured surfaces reveals that the fracture mode differs from one another in that the composites are of brittle characteristic at room and elevated temperatures due to its limited failure strain, whereas the fracture mode of the magnesium alloy has a transition from brittleness at room temperature towards ductileness at elevated temperature.

Abstract:本文研究了鈮離子注入對鋯-4合金在400℃和500℃、10．3MPa高壓釜中蒸汽腐蝕行為的影響。試驗結(jié)果表明：鈮離子注入能夠改善鋯-4合金抗400℃和500℃高壓蒸汽腐蝕性能，并且，比較而言對500℃蒸汽腐蝕性能提高的程度更為顯著。為了理解鈮離子注入影響的機理，應(yīng)用SEM、XRD、XPS等分析手段分析了氧化膜的形貌、相結(jié)構(gòu)、注入元素的價態(tài)及組成。

Abstract:Void growth behavior plays an important role in the deformation, damage and rupture of the nickel-base single crystal superalloys at high temperature. A set of creep, fatigue and thermal-mechanical-fatigue (TMF) experiments was carried out. The SEM observation on the fractured surfaces shows that for all experiments studied in this paper the fracture surfaces are made up of small facets. In the center of the facet, there is at least one void. The dimension of the void is dependent on the loading conditions. Crystallographic finite element method was applied to simulate the void growth by a cell model. Creep loading condition and plastic loading condition were modeled. The influence of the crystallographic orientations on the void growth was studied. The finite element study of the void growth can help to understand the experimental results.

Abstract:The thermal shock behavior of TiB2- Cu composite by combustion synthesis was investigated using plasma arc heating and numerical simulation. The transient temperalure field and thermal stress fields affected by inhomogeneous boundary conditions of heat transfer in high temperature were simulated and analyzed based on the thermal physical data with ANSYS commercial software. The results reveal that the maximum compression stresses are generated at center of sample and decreased along radius. The compression stresses transform to tensile stresses when the arc beam gets across the heating area, and the largest tensile stress takes place in the edge of the specimen. The crack may initiate in the edge of the sample, and then properly propagates to the position of center in the direction of radius. The experiment of plasma arc heating also favor and approve the rationality nf theoretical model.

Abstract:以高純蒸餾Gd為原料制備了Gd5ShGe2合金，研究了不同熱處理工藝對合金的顯微組織結(jié)構(gòu)及磁熱效應(yīng)的影響。利用掃描電子顯微鏡及電子能譜對合金的顯微組織結(jié)構(gòu)及成分進(jìn)行了測試。利用振動樣品磁強計測量了合金在250K～290K范圍內(nèi)的等溫磁化曲線，并根據(jù)麥克斯韋方程對其磁熵變進(jìn)行了計算。研究發(fā)現(xiàn)，通過適當(dāng)?shù)臒崽幚恚辖鸬娘@微組織得到充分地均勻化，合金中的雜質(zhì)相得到有效去除。因此，磁熵值較鑄態(tài)提高將近200％，磁有序溫度下降約lOK。

Abstract:將Zn粉末置于流量為500ml／min的NH3氣流中，在600℃氮化120min，制備出高質(zhì)量的Zn3N2粉末。X射線衍射（XRD）表明Zn3N2粉末具有立方結(jié)構(gòu)，其晶格常數(shù)為0．9788nm。掃描電子顯微鏡（SEM）和透射電子顯微鏡（TEM）觀察發(fā)現(xiàn)Zn3N2粉末晶粒形狀具有多樣性。X射線光電子譜（XPS）表明Zn3N2的化學(xué)鍵狀態(tài)與ZnO及金屬Zn明顯不同，表明N-Zn鍵的形成。用計算機模擬了Zn3N2晶體的立體結(jié)構(gòu)，用高分辨電子顯微鏡（HRTEM）觀察了Zn3N2粉末的內(nèi)部結(jié)構(gòu)，觀察結(jié)果與Partin等提出的Zn3N2結(jié)構(gòu)模型相符合。

Abstract:In this paper, Nd:GGG single crystal was grown by Cz method. Fluorescence spectra and absorption spectra was measured after the Nd:GGG single crystal was cut and polished. The main absorption peak of Nd:GGG crystal is 808 nm and fluorescence-emission peak is 9430 cm-1, which correspond to 4F3/2-4I11/2 emission band of Nd3+ ions. At the same time, absorption intensity become stronger with the increasing of Nd3+ ions concentration.

Abstract:Wear resistant TieNi3Si reinforced intermetallic coatings were fabricated on a substrate of titanium alloy BT9 by laser cladding using Ti-50Ni-10Si alloy powders as the precursor materials. Results indicate that the laser clad intermetallic comings have a rapidly solidified homogeneous microstructure consisting of TieNi3Si primary dendrites and TieNi3Si/NiTi eutectic. Wear resistance of the laser clad Ti2Ni3Si reinforced intermetallic coatings was evaluated under dry sliding wear test conditions at room temperature. Because of the high hardness and strong covalent dominant atomic bonds of the Ti2Ni3Si primary dendrites with MgZn2 type Laves crystal structure and the high yield strength and toughness of the eutectic, the Ti2Ni3Si/NiTi intermetallic coatings have excellent wear resistance under dry sliding wear test conditions.

Abstract:The Zr41.25Ti13.75Cu12.5Ni10Be22.5 bulk metallic glass is reinforced with up to 60 volume percent of tungsten particulate. Samples with 10mm in diameter are obtained when quenching melt contained in stainless steel tube into saturated brine. A characterization based on X-ray diffraction and scanning electron microscopy is presented. Compressive tests were performed for the metallic glass matrix composites and single phase bulk metallic glass. Compressive strain-to-failure increase significantly compared to unreinforced single phase Zr41.25Ti13.75Cu12.5Ni10Be22.5 bulk metallic glass. The results are discussed in term of particulate size and yield strength of the reinforcement.

Abstract:采用疊層加壓SPS燒結(jié)法制備致密的YG10/YG20梯度結(jié)構(gòu)硬質(zhì)合金。通過調(diào)整WC粒度和添加微量元素B來調(diào)整燒結(jié)溫度,使含鈷量低的粉末與含鈷量高的粉末的燒結(jié)溫度相近。研究了燒結(jié)溫度對致密度、組織形貌、顯微硬度和斷裂韌性的影響,分析了沿梯度截面上C,Co,W等成分、顯微硬度的變化及YG10/YG20界面的結(jié)合情況。結(jié)果表明:原始WC粒度為1μm的YG10+0.05%B混合粉末和9μm的YG20混合粉末都能在1100℃~1160℃燒結(jié)致密,相對密度達(dá)到99%以上,晶粒尺寸均勻,梯度界面結(jié)合良好,沒有開裂現(xiàn)象。低鈷端的硬度達(dá)到了15500MPa~16000MPa,高鈷端的硬度為11100MPa;在294N載荷的作用下低鈷端的斷裂韌性為12.62MPa·m1/2,而高鈷端在這一載荷的作用下沒有出現(xiàn)裂紋,斷裂韌性較高,從而實現(xiàn)了硬質(zhì)合金一端具有高硬度,另一端具有良好的韌性的有機結(jié)合。

Abstract:將傳統(tǒng)蠟基粘結(jié)劑和油＋蠟改進(jìn)粘結(jié)劑體系分別與粒度為1．97μm的WC-8Co硬質(zhì)合金粉末混合采用注射成形法制備了全致密高強度的硬質(zhì)合金。研究了注射坯在Hz中的熱脫脂工藝和溶劑脫脂與其后補充熱脫脂工藝，和不同脫脂工藝對脫脂坯碳含量的影響。結(jié)果表明：油＋蠟改進(jìn)粘結(jié)劑體系具有更好的熱脫脂和溶劑脫脂行為。通過工藝優(yōu)化和碳含量控制，在真空氣氛下1400℃燒結(jié)80min制備出高抗彎強度的全致密硬質(zhì)合金燒結(jié)制品。

Abstract:借助XRD，DSC，TEM等分析手段，研究了Fe86Zr5Nb6B3快淬帶球磨粉末的熱穩(wěn)定性以及高壓燒結(jié)條件對塊體合金的相組成和晶粒尺寸的影響。結(jié)果表明：（1）球磨快淬粉末仍為非晶態(tài)，其晶化溫度約510℃，該晶化過程的表觀激活能廬219．5kJ／mol：（2）在5．5GPa，3min燒結(jié)條件下，當(dāng)Pw=1150W后，獲得了相對密度為99．1％，單相α-Fe納米晶（20．6rim）塊體合金：（3）在5．5GPa，1150W燒結(jié)條件下，當(dāng)t延長至25min后，α-Fe相納米晶粒尺寸長大到28.7nm；（4）在5．5GPa，1150W，5min燒結(jié)條件下，納米晶塊體合金的飽和磁感應(yīng)強度Bs=1．26T，矯頑力Hc=4．27kA．m^-1。

Abstract:利用熔體快淬法制備了La1-xNdxFe11．5Si1．5（x=0，0．3，0.5）快淬帶。通過X射線衍射和振動樣品磁強計測試了回火態(tài)（1000℃，5h）La1-xNdxFe11．5Si1．5）快淬帶的相組成和磁性能。結(jié)果表明：不同成分快淬帶回火后均可得到穩(wěn)定的NaZnl，型化合物。和常規(guī)的熔煉法相比，用熔體快淬法通過短時間的回火（1000℃，5h）可以制成具有大磁熵變的NaZn13型的化合物。用Nd替代部分的La后，居里溫度略有提高，同時保持有大的磁熵變｜△S｜；并且隨著Nd含量的增加，有效制冷溫區(qū)有變寬的趨勢。

Abstract:利用γ射線輻照制備出均勻分布在PAM中的銀粒子，直徑約10nm。制備出的復(fù)合物再通過物理混合的方法與EVA復(fù)合，得到穩(wěn)定的納米Ag／PAM／EVA復(fù)合材料。結(jié)果表明：納米銀復(fù)合材料具有較高的電阻率和擊穿場強，較低的tgδ和較高的介電常數(shù)。這種納米粒子的新穎特性可以用庫侖阻塞機理解釋。

Abstract:In normal temperature and pressure, two kinds of one-dimensional nano-structures with different patterns and structures, whose substrate were Cu-Zn-Al alloy, were successfully prepared after treating by mixed acid. It is found that the products are similar to nanotube because of their hollow and cylindrical structures, but their tube wall is thicker and their inner diameter is thinner than that of typical nanotube. The selected area electron diffraction and EDX analyze is confirm that the products are one-dimensional Cu-Zn-Al alloy nano-structures. The growth mechanics of nano-structures are primarily studied and the growth model is also put forward.

Abstract:TiO2光催化納米薄膜在400℃～80℃溫內(nèi)恒溫退火1h-2h，以消除膜內(nèi)非晶，提高薄膜光催化活性。熱處理前后試樣的檢測結(jié)果表明：退火使TiO2薄膜內(nèi)非晶晶化，晶粒長大，光響應(yīng)電流增大。隨退火溫度的升高，TiO2薄膜出現(xiàn)由非晶斗銳鈦礦斗金紅石的轉(zhuǎn)變。其中，600℃退火1h的TiO2薄膜為銳鈦礦加金紅石的混晶結(jié)構(gòu)，光電流密度最大Iuv=41．2A／m^2，光催化活性最好。

Abstract:In this paper, two knitting structures are designed and tested. It is observed that the resistance of Stainless Steel (SS) fiber fabric has a linear relationship with strain within a definite range. Any change in fabric structure may cause changes of the linear range and sensitivity of the strain sensor. The main mechanism of the fabric sensitive to strain has been deduced to be the change of contact resistance between yarns during stretching.

Abstract:The elevated temperature plastic deformation was studied by thermomechanical processes for three kinds of Mg-RE alloys in different temperature and different strain rate. The results show that the flow stress of 1# alloy containing Ce is lower than that of 2# alloy containing Nd, and 3# alloy containing Nd and Y at same temperature and same strain rate. The 1# alloy containing Ce is more suitable for extrusion forming from thermal deformation angle.

Abstract:以鑄造CoCrMoC合金（ASTMF 75-82）為研究對象，通過金相觀察，XRD，SEM和EDX分析以及磨損試驗，研究了該合金在不同熱處理條件下的顯微結(jié)構(gòu)與耐磨損性能。結(jié)果表明：不含C的CoCrMo合金的耐磨損性能幾乎不受熱處理制度的影響：含C的CoCrMoC合金在1100℃以上溫度固溶處理耐磨損性能明顯提高，其中1200℃是最佳溫度，固溶后時效處理降低合金的耐磨損性能。分析認(rèn)為，固溶引起的fcc鈷基體固溶強化和適當(dāng)?shù)奶蓟锓植际翘岣吣湍p性能的主要原因，而時效引起的基體fcc相→hcp相的等溫馬氏體相變對耐磨損性能影響不大。

Abstract:采用溶膠凝膠自蔓延法制備了不同配比的SiO2-CaO-P2O5-MgO系生物活性玻璃粉，并通過壓制燒結(jié)工藝制成塊狀玻璃陶瓷材料。研究了材料的組織結(jié)構(gòu)、力學(xué)性能和在骨內(nèi)種植試驗中的生物學(xué)行為。結(jié)果表明：經(jīng)過1100℃燒結(jié)熱處理后，凝膠玻璃基體中析出（Ca，Mg）3（PO4）2晶體和MgSiO3晶體，其中，硅含量較高的樣品中析出晶體的尺寸較大，具有較高的彎曲強度和斷裂韌性值，分別可達(dá)172MPa和2．02MPa．m^1/2。兩種材料植入動物體內(nèi)后與骨組織接觸良好，未見明顯的炎癥反應(yīng)。其中硅含量較高的樣品植入骨內(nèi)僅3周即可在骨與材料接觸面處生成大量新生血管和骨小梁，植入6周后即與骨融合，兩者之間鈣磷含量較高且連續(xù)，沒有明顯的界面，這些結(jié)果證明該材料具有良好的骨組織相容性，是一種較為理想的骨修復(fù)替代材料。

Abstract:為了制備均勻致密、結(jié)合強度較高的電泳陶瓷涂層,用正丁醇作分散介質(zhì),在Ti基底上電泳沉積HA/Ti復(fù)合涂層。研究了Ti基底處理、燒結(jié)溫度控制以及懸浮液配方等因素對涂層結(jié)合強度的影響。用掃描電鏡(SEM)對熱處理后涂層形貌和結(jié)構(gòu)進(jìn)行觀察,采用紅外光譜儀(FTIR)、X射線衍射儀(XRD)、差示掃描量熱儀(DSC/TG)對涂層的組成和熱穩(wěn)定性進(jìn)行了表征。結(jié)果表明:用H2O2/NH3·H2O處理Ti基底,700℃下燒結(jié),Ti含量為44.6%的HA/Ti復(fù)合涂層結(jié)合強度可達(dá)到23.2MPa。

Abstract:采用MoSi2粉末自燒結(jié)方法，在SiC電熱元件表面制備一層致密的MoSi2高溫抗氧化涂層，并對其高溫抗氧化性進(jìn)行測試?？寡趸囼炘诳諝庵?500℃爐溫下進(jìn)行118h和32次熱循環(huán)，結(jié)果表明，帶有MoSi2涂層的試樣表面致密光潔，且試樣抗氧化性能隨MoSi2涂層厚度增加。SEM和EPMA顯微分析表明，MoSi2涂層與SiC基體結(jié)合較好，沒有起層和剝落，涂層中Mo分布均勻，損失約為20％。

Abstract:The effect of BN content on sintering properties of Ni-based abradable seal alloy was investigated. The sintering process and model with BN and without BN were studied. To establish model to research the process of Ni-Cr/BN sintering expansion. BN powders hinder sintering between powders, and the sintering expansion and the density falling are discovered.

Abstract:以固態(tài)氧化物為原料，采用傳統(tǒng)方法制備錯摻雜PZT壓電陶瓷。通過XPS，XRD以及SEM方法分析組成為Pb1-1．5xPbZr0．54Ti0．46O3（x=0．02～0．08）壓電陶瓷的元素價態(tài)，相組成以及顯微結(jié)構(gòu)。結(jié)果發(fā)現(xiàn)：合成溫度900℃，可以得到鈣鈦礦結(jié)構(gòu)。在鐠摻雜為3mol％的準(zhǔn)同型相界附近三方相和四方相并存，綜合性能達(dá)最佳值：E33^T／ε0=2000，d33=418pC/N，Kp=52．9％，Qm=75。隨著鐠摻雜量的增加，Pr-PZT陶瓷的居里溫度降低。

Abstract:采用陶瓷先驅(qū)體有機聚合物聚硅氧烷連接反應(yīng)燒結(jié)碳化硅（RBSiC）陶瓷。研究了連接溫度、連接壓力、保溫時間對連接強度的影響。通過正交優(yōu)選實驗，確定了最佳工藝參數(shù)：連接溫度為1300℃，連接壓力為25kPa，保溫時間為120min。在此工藝條件下制備的連接件經(jīng)3次浸漬／裂解增強處理，其抗彎強度達(dá)132．6MPa，連接件斷口表面粘有大量從母材剝離下來的SiC。XRD研究表明，在1100℃～1400℃的試驗范圍之內(nèi)，隨著連接溫度的逐步升高，聚硅氧烷的裂解產(chǎn)物發(fā)生了由非晶態(tài)向晶態(tài)的轉(zhuǎn)變。這種轉(zhuǎn)變對連接強度有顯著影響。掃描電鏡（SEM）及能譜（EDX）分析顯示，連接層厚度為3μm左右，結(jié)構(gòu)較為均勻致密，且與母材間界面結(jié)合良好。

Abstract:Indium tin oxide films(In2O3-SnO2)were deposited onto glass at different oxygen flows by R.F. magnetron sputtering method. Transmittance in visible light and an energy band gap were measured by ultraviolet spectrophotometer . square resistance was measured by four-point probe. The thickness and complex refractive index of films were measured by spectroscopic ellipsomtry. The component of the ITO films was studied by XPS. The study indicates that the deposited ratio and refractive indexes of films are related to the O2 flow rate, The transmittance in visible light is beyond 80% (including glass substrate) with the film thickness 60nm and 9sccm oxygen flux. The transmittance and square resistance can be improved by hot treatment. XPS investigation shows that the photoelectricity properties can be deteriorated by the sub-oxides, which can be reduced by oxygen flux.

Abstract:制備了摩爾比為1：1的TiO2和CeO2陶瓷靶材。采用射頻磁控濺射法在O2和Ar比例為5：95的混合氣體中制備了玻璃基TiO2-CeO2薄膜。濺射過程中，工作氣壓保持在1．8Pa不變，玻璃基片溫度從室溫（RT）～220℃之間變化。用x射線衍射（XRD）、X射線光電子能譜（XPS）、掃描電鏡（SEM）、透射電鏡（TEM）和紫外-可見光譜儀研究了薄膜的物相結(jié)構(gòu)、表面組成、表面形貌和鍍膜試樣的紫外-可見光透過率。結(jié)果表明，薄膜表面結(jié)構(gòu)平滑、致密，呈微小晶粒結(jié)構(gòu)，薄膜中Ti和Ce僅以Ti^4＋和Ce^4＋的形式存在；隨著基片溫度升高，薄膜中的細(xì)小晶粒略有長大；TiO2-CeO2鍍膜玻璃可以有效地截止紫外線。

Abstract:Zeolites Y and the Y(m) modified by methyltrimethoxysilane were used for the hosts to prepare the Cd-Y and Cd-Y(m) samples by ion-exchange method and then the Y-CdS and Y(m)-CdS host-guest nanocomposite samples were prepared by a hydrothermal method by using thiacetamide as a sulfur source instead of toxic hydrogen sulfide. By mean of powder X-ray diffraction, chemical analysis, infrared spectroscopy, solid diffusion reflectance absorption spectroscopy, luminescence investigation, the prepared samples were characterized. The results of powder XRD analyses show that after the incorparation of CdS into the Y and Y(m) zeolites the frameworks of the prepared samples still exist and keep high ordered property. The IR results show that the formation of a new bond Si-O-Cd in Y-CdS and Y(m)-CdS samples. The results of solid diffusion reflectance absorption spectra show that there is no absorption from Y and Y(modified) zeolites, and there is not obvious difference for the absorption spectra between the Y-CdS and Y(m)-CdS samples. Luminescence studies show that for the Y-CdS and Y(m)-CdS samples there appear luminescence. The host-guest nanocomposite materials prepared have the potential ability as luminescent materials.

Abstract:應(yīng)用傳統(tǒng)的漿料發(fā)泡法，通過孔隙優(yōu)化，成功制備出力學(xué)性能與骨匹配的多孔鈦。掃描電鏡分析發(fā)現(xiàn)其孔隙相互連通成三維網(wǎng)狀結(jié)構(gòu)；經(jīng)堿熱處理的多孔鈦在模擬體液中浸泡14d后，表面被一層類骨磷灰石覆蓋，具有良好的生物活性。此多孔鈦有望成為理想的負(fù)重骨缺損修復(fù)材料。

Abstract:Cu64Zr36 amorphous ribbons were prepared by melting-spun technique. The crystallization process and kinetics were investigated by isothermal annealing at different temperature, DSC and XRD. The results show that the crystallization process is that Cu10Zr7 would precipitates primarily, then CuZr2. The activation energies of glass transition and crystallization are 433.7 kJ/mol and 603 kJ/mol, respectively.

Abstract:Ag-coated Au composite nanoparticles are prepared via solution-phase reduction method and clearly observed by TEM. The optical absorption spectra show that the as-prepared particles have two distinct plasma a absorption bands. One absorption peak centers near the plasma a absorption band of pure Ag nanoparticles, another absorption peak intervenes between the plasma a absorption bands of pure Ag and pure Au nanoparticles and undergoes blue-shift. According to the experimental analysis and numerical calculation based on Mie scattering theory, it is reasonable to attribute the blue-shift to the thickness increasing of Ag-shells.

Abstract:The progress of interracial reaction diffusion of SiC fiber-reinforced Ti matrix composites is described. The reaction diffusion models, the dynamics and thermodynamics, the control mechanism of interracial reaction, and the effect of diffusion barriers on interracial reaction diffusion are introduced. Further research directions and focus of SiC fiber reinforced Ti matrix composites are pointed out.