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1.
Suspension and solution thermal spray coatings   总被引:3,自引:0,他引:3  
The emerging methods of coating deposition by suspension and solution thermal spraying are described. The liquid suspensions of fine powders and liquid precursors are injected into flames and/or jets generated in the torches. The formulation and stability of suspensions as well as the methods of fine powders synthesis are briefly described. Typical solutions, being often the liquid organo-metallics are also briefly described. An important problem of injection of liquids into jets and flames is then presented. Two principal modes of injection, used at present, are outlined, i.e.: (i) atomization; and, (ii) injection of a continuous jet. Subsequently, the phenomena occurring in flames and plasma jets are discussed and the major differences to these occurring during conventional spraying are stressed up. The build up of coatings starting from the impact of fine particles on the substrate is described and typical microstructures of suspension and solution sprayed coatings are shown. Some properties of the sprayed coatings, including mechanical, electrical, chemical, and thermophysical ones are collected and presented. Finally, the emerging applications of coatings are shown and the possible future applications are discussed.  相似文献
2.
Owing to the adaptability to large scale processing,excellent composition control and film uniformity,the metal-organic chemical vapor deposition(MOCVD)technique is a promising process for high-temperature superconductor YBa2Cu3O7-δ(YBCO)preparation.In this technique,the evaporation characteristics and thermostability of adopted precursors in whole process will decide the quality and reproducible results of YBCO film.In the present report,bis(2,2,6,6-tetramethyl-3,5-heptanedionato)copper(Ⅱ)(Cu(TMHD)2)was synthesized by the interaction of copper acetate hydrate with TMHD in methanol solution,and its structure was identified by FTIR,1H NMR,and EI-MS spectroscopy.Subsequently,thermal property and the kinetics of decomposition were systematically investigated by nonisothermal thermogravimetric analysis methods(TGA)at different heating rates in streams of N2,and the average apparent activation energy of evaporation process was evaluated by the Ozawa,Kissinger,and Friedman methods.The possible conversion function was estimated through the Coats-Redfern method to characterize the evaporation patterns and followed a phase boundary reaction mechanism by the contracting area equation with average activation energy of 85.1 kJ·mol-1.  相似文献
3.
1 IntroductionZnOisawide gap ( 3.2eVatroomtemperature)semiconductormaterialhavingthewurtzitestructurewithdirectenergyband .Ithasbeenconsideredasapromis ingmaterialforoptoelectronicdevicesinthenearultraviolet(UV)andbluespec tra .AninterestingfeatureofZnOisitsl…  相似文献
4.
The MOCVD technique was used to form thin films of chromia and/or of a rare-earth-element oxide on the surface of F17Ti stainless-steel samples. These oxides were deposited alone or together, successively or by codeposition. Coated samples were then subjected to high-temperature oxidation tests, either under isothermal conditions at 1273 K for 50 h, or under cyclic conditions at 1223 K for 40 cycles. An improved oxidation behavior was observed in every case, especially with codeposited Ln2O3-Cr2O3. Weight gain decreased during oxidation, compared with an uncoated sample, and scale spallation, generally observed under cyclic conditions, disappeared. Longer time experiments were also carried out. Large differences were observed, depending on the sample surface treatment.  相似文献
5.
MOCVD制备的Pt/C薄膜的结构与性能研究   总被引:1,自引:0,他引:1  
以乙酰丙酮铂为前驱体,采用金属有机化合物化学气相沉积(MOCVD)法在石英及YSZ基体上制备Pt/C薄膜,研究了Pt/C薄膜的结构和电化学性能.沉积过程中通入一定量的氧气可以大幅降低Pt/C薄膜中的含C量,含C较高的Pt/C薄膜的XRD谱线低而宽,具有非晶态衍射特征.在500℃测量温度下,以Pt/C薄膜为电极的YSZ氧气浓差电池的电动势及电流输出高于传统的Pt电极.  相似文献
6.
一种新的β二酮铱MOCVD前驱体的制备及成膜性能   总被引:1,自引:0,他引:1  
从铱盐和配体2,2,6,6-四甲基-3,5-庚二酮(thd)出发合成了一种新的β二酮前驱体Ir(thd)3,通过元素分析、红外光谱、核磁共振氢谱等手段对合成的前驱体进行了结构表征.热重分析表明,当温度升到290℃,前驱体基本挥发完全.使用合成的前驱体通过MOCVD沉积制备铱薄膜,利用XRD和AFM分析手段对薄膜的结构和表面形貌进行了表征.结果表明,所得到的薄膜的物相为铱晶相,无其它的杂质峰存在,薄膜表面连续、致密.  相似文献
7.
前驱体加热温度对Pt-Ir合金薄膜的成分与沉积速率的影响   总被引:1,自引:0,他引:1  
以乙酰丙酮铱和乙酰丙酮铂为前驱体,采用金属有机化合物化学气相沉积(MOCVD)技术在钼基体上沉积了PtIr薄膜。研究了前驱体加热温度对PtIr薄膜结构、成分和沉积速率的影响。结果表明,MOCVD的PtIr薄膜为合金膜,Pt-Ir合金薄膜成分、沉积速率随前躯体加热温度变化而变化,并存在极值点。  相似文献
8.
碳掺杂氧化钛薄膜可见光催化性能及机制研究   总被引:1,自引:0,他引:1  
以四异丙醇钛为原料,用大气开放式MOCVD装置通过控制工艺参数制备不同含碳量的氧化钛薄膜.分别采用EDS、XRD、SEM、UV-VIS、罗丹明B光催化降解的方法对不同碳含量的碳掺杂氧化钛薄膜的光吸收性能以及可见光下的光催化活性进行研究.研究结果表明,随着碳掺杂量的增加,薄膜的可见光吸收和可见光催化活性均增强.  相似文献
9.
铱薄膜的MOCVD沉积效果研究   总被引:1,自引:0,他引:1       下载免费PDF全文
以乙酰丙酮铱为前驱体,采用金属有机化合物化学气相沉积(MOCVD)技术在Mo基体上制备Ir薄膜。研究Ir的沉积效果与沉积温度及反应气体(O2)间的关系。Ir薄膜的沉积速率与沉积温度之间的关系不符合Arrhenius方程,沉积速率与沉积温度绝对温度的倒数呈抛物线关系,当温度为750℃时,Ir的沉积速率达到最大值,沉积温度对Ir薄膜的显微形貌有显著影响;O2的流量对薄膜的成分、形貌及结构等均有显著影响。  相似文献
10.
For the metalorganic chemical vapor deposition (MOCVD) of copper films using the β-diketonate complex copper t-butylacetoacetate or bis(t-butyl-3-oxo-butanoato)copper(II) as the precursor material, the equilibrium concentrations of various condensed and gaseous phases have been thermodynamically calculated, using the criterion of minimization of total Gibbs free energy of the system. The study predicts the deposition of films of metallic copper without the presence of any oxides, even in an inert atmosphere of argon. The Cu films so formed would contain a small amount of carbon, which reduces to zero at higher temperatures. In the reactive ambient of hydrogen, carbon-free copper film is predicted over a wide range of substrate temperatures and total reactor pressures. The thermodynamic yield shows reasonable agreement with experimental observations, though the removal of carbon from the MOCVD-grown copper films in hydrogen is not as complete as the thermodynamic calculations predict.  相似文献
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