电泳沉积技术制备铁电陶瓷薄膜的研究进展

综述了电泳沉积技术在制备铁电陶瓷薄膜方面的最新研究进展,讨论了陶瓷特性、电压、分散剂、热处理时间等因素对电泳沉积铁电薄膜性能的影响.最后展望了电泳沉积技术制备铁电陶瓷薄膜的进一步发展.     

电沉积生物活性陶瓷涂层技术

介绍了电沉积法（包括电泳沉积EPD和电化学沉积ECD）在Ti或Ti合金基体上制备生物活性陶瓷涂层HAP的制备工艺,评述了电沉积的主要控制参数,总结了该技术的特点并展望了其应用前景。     

钛合金表面阴极微弧电沉积Al2O3-SiC复合涂层

通过高温烧结法在TC4钛合金表面制备了起弧阻挡层,然后采用阴极微弧电沉积工艺在TC4钛合金表面制备了Al2O3-SiC复合陶瓷涂层,重点研究了复合陶瓷涂层的制备工艺及影响因素,并采用扫描电镜、能谱仪等观测了起弧阻挡层及复合陶瓷涂层的表面微观形貌及成分组成。结果表明,阴极微弧电沉积技术能够在钛合金表面制备出Al2O3-SiC复合涂层,且起弧阻挡层至关重要,为起弧必备条件,SiC在Al2O3基体中的分散性较好,涂层较厚且分布均匀。     

一维CuO纳米针材料的直径可控制备研究

采用脉冲电沉积技术在金属Cu基板表面电沉积纳米晶Cu薄膜，在空气中采用热氧化法制备出一维金属CuO纳米针材料。实验研究了脉冲电沉积参数（输出脉冲频率f和占空比r）对电沉积纳米晶的微结构和晶粒度的影响，发现一维CuO纳米针的根部直径与电沉积纳米晶Cu的晶粒度完全一致。通过调节脉冲电沉积参数，能控制电沉积纳米晶Cu的晶粒度，进而实现一维CuO纳米针材料的直径可控分布。     

冷喷涂铜基陶瓷复合涂层沉积机理与结构性能优化研究进展

陶瓷颗粒与铜颗粒的热膨胀系数差异较大，故热喷涂的高温制备易导致涂层分层、开裂和失效。冷喷涂具有热输入低、不易氧化、沉积率高等特点，可以降低甚至避免高温冷却造成的相关缺陷，因此在制备高质量的铜基陶瓷复合涂层时的优势明显。本文首先对三种经典冷喷涂金属及金属合金涂层界面结合的基本概念和原理进行了概括，在此基础上对金属基陶瓷复合涂层的沉积机理进行了归纳总结；其次，从喷涂粉末制备工艺、喷涂前期基体状态和沉积过程工艺参数三个方面对铜基陶瓷复合涂层的组织结构和性能优化方法进行了梳理；最后，对冷喷涂铜基陶瓷复合涂层沉积技术和机理研究的发展方向进行了展望。     

电沉积Fe—Ni—P合金的磁性研究

通过对电沉积Ｆｅ－Ｎｉ－Ｐ合金磁性的测定，获得了合金成分以及电沉积工艺对其技术磁性的影响规律。研究结果表明，合金中Ｐ，Ｆｅ含量，电沉积镀液ｐＨ值和电流密度对Ｆｅ－Ｎｉ－Ｐ非晶合金的技术磁性均有很大影响。     

电沉积技术在制备纳米薄膜方面的应用

综述了电沉积技术制备纳米薄膜的研究,介绍了电沉积技术制备纳米膜的基本工艺,讨论了电沉积技术制备纳米薄膜的原理、分类、应用情况,阐述了目前存在的问题,并对今后采用电沉积技术制备纳米薄膜的研究方向提出了一些建议。     

低温沉积陶瓷涂层技术的研究进展

对当前低温沉积陶瓷涂层的技术进行了综述,包括液相沉积法、溶胶-凝胶法等,并分析了各种低温沉积技术的优缺点,展望了低温沉积技术的发展前景.     

制备陶瓷件的快速成型技术

对制备复杂陶瓷件的快速成型技术,如分层实体制造、熔化沉积造型、形状沉积成型、立体光刻、选区激光烧结、喷墨打印等的原理,工艺和特点进行了评述。结果表明,快速成型技术有潜力制造复杂的结构陶瓷件、功能陶瓷件、生物陶瓷件和压电陶瓷件。这些技术制备的陶瓷件的性能可与传统方法制备的陶瓷件相媲美。展望了这些技术和前景。     

电化学组装一维纳米线阵列p型Bi2Te3温差电材料

：对p型Bi2Te3温差电材料的电沉积过程进行了研究，分析了添加剂对电沉积过程的影响．在此基础上，以孔径为50nm的阳极氧化铝多孔膜为模板，采用直流电沉积技术，在氧化铝多孔模板的纳米级微孔内电化学组装出了P型Bi2Te3纳米线阵列温差电材料，性能研究表明，p型Bi2Te3纳米线阵列的温差电性能远远超过具有相同组成的块状温差电材料。     

Insertion of triangulated surfaces into a meccano tetrahedral discretization by means of mesh refinement and optimization procedures

In this paper, we present a new method for inserting several triangulated surfaces into an existing tetrahedral mesh generated by the meccano method. The result is a conformal mesh where each inserted surface is approximated by a set of faces of the final tetrahedral mesh. First, the tetrahedral mesh is refined around the inserted surfaces to capture their geometric features. Second, each immersed surface is approximated by a set of faces from the tetrahedral mesh. Third, following a novel approach, the nodes of the approximated surfaces are mapped to the corresponding immersed surface. Fourth, we untangle and smooth the mesh by optimizing a regularized shape distortion measure for tetrahedral elements in which we move all the nodes of the mesh, restricting the movement of the edge and surface nodes along the corresponding entity they belong to. The refining process allows approximating the immersed surface for any initial meccano tetrahedral mesh. Moreover, the proposed projection method avoids computational expensive geometric projections. Finally, the applied simultaneous untangling and smoothing process delivers a high‐quality mesh and ensures that the immersed surfaces are interpolated. Several examples are presented to assess the properties of the proposed method.     

Certification Institutions Expected to Update and Transfer Information on Present Standards

Standards are the basis for production enterprises to organize production, ex-factory inspection, trade (delivery) and technical exchanges, product certification, quality arbitration and supervision.……     

Flow calorimeter for enthalpy increment measurements on condensed gases

A flow calorimeter for enthalpy increment measurements on condensed gases is presented. A better knowledge of the properties of the liquefied natural gas is needed, and therefore a liquid loop has been designed for our flow calorimeter. The fluid loop in the calorimeter is designed in order to avoid the two-phase region, since two phases would give compositional disturbances in the measurements. The avoidance of the two-phase region is made possible by increasing the pressure of the test fluid after the measurement section, then heating the fluid at super-critical pressure past the critical point. Finally, the fluid is throttled to the low-pressure gas state at the inlet condition of the compressor that circulates the fluid. To perform the pressure increase, a new cryogenic pump has been designed. To evaluate the new equipment, measurements were taken on liquid ethane over the temperature range 146–256 K at pressure between 0.9 and 5.1 MPa.     

Refrigerators Enter a New Era of Health Preservation Frestech initiates the establishment of China's first standard for household sterilization refrigerators

On November 30, 2007, the China Association for Standardization (CAS) held a press conference at Beijing Diaoyutai State Guest House. Leaders from the China Household Electric Appliance Research Institute, the China Household Electric Appliance Association, and the China Consumers' Association attended and made speeches.……     

Optimum-Simulation von Ernteprozessen

Zusammenfassung Bei der Gestaltung von Ernteprozessen — beispielsweise des Prozesses Mähdrusch, Körnertransport und -abnahme — als transportverbundene Fließarbeitsverfahren mit mindestens zwei verschiedenen Arbeitsmitteln gibt es einen großen Optimierungsspielraum. Solche Prozesse sind mehrstufige Bedienungsprozesse mit gemischter Anordnung der Bedienungseinrichtungen. Außerdem besitzen sie stark ausgeprägte räumliche Aspekte. Es wird vor allem gezeigt, welche Merkmale solcher Prozesse in Simulationsmodellen abgebildet sein müssen, welche Zielgrößen in Abhängigkeit von welchen Einflußgrößen unter Berücksichtigung welcher Prozeßbedingungen ermittelt werden sollten und wie der Bewertungsprozeß zur Ermittlung der gewünschten Informationen gestaltet werden muß.     

A study of centrifugal cast high boron high speed steel

In the present study a high‐boron high speed steel (HSS) roll material was designed. Many expensive alloy elements have been substituted by cheap boron alloy, and high‐boron high speed steel roll has been manufactured by centrifugal casting method. The microstructures, mechanical properties and wear resistance of centrifugal casting high‐boron high speed steel roll have been investigated by optical microscopy (OM), scanning electron microscopy (SEM), and X‐ray diffraction (XRD) analysis, hardness test, impact test and wear test. The results indicated that the solidification microstructures of high‐boron high speed steel roll consisted of M₂(B,C), (W,Mo)₂(B,C), M₃(B,C), M₂₃(B,C)₆ type borocarbides and martensite, a small amount of retained austenite. Borocarbides were continuously distributed over the grain boundary. After quenching from 1050 °C, local broken network appeared in partial borocarbides, and fine secondary borocarbide precipitated from the matrix. After tempering from 525 °C, the amount of precipitated borocarbide increased significantly. After heat treatment, the hardness of high‐boron high speed steel roll excelled 60 HRC, and its impact toughness excelled 8.0 J/cm². The single groove steel rolling amount of high‐boron high speed steel rolls increases by 500% than that of bainite cast iron roll, when the rolls are used in K₁ mill housing of bar mill.     

Thixotropy of Systems with Shear Thinning and Plastic Flow Behavior

The definition of the thixotropy is a decrease in viscosity with time in shear and a subsequent recovery of viscosity after the shear deformation is removed.We ...     

Brainstorming for ISO Strategy 2016-2020

正Responding to ISO’s appeal for survey for the to-be-developed ISO Strategy Plan for 2016-2020,SAC hosted a special workshop over the needs and comments of various fi elds on June 8 in Beijing.The workshop was attended by ISO President-elect and Ansteel General Manager Zhang Xiaogang,SAC Vice-Administrator Yu Xinli,and 30 experts from     

CNAS Passes APLAC's PTP Review

正The review group of Asia Pacific Laboratory Accreditation Cooperation(APLAC)carried out a 4-day peer review of the proficiency testing provider(PTP)for China National Accreditation Service for Conformity Assessment(CNAS)from July 28 to 31,2014.CNAS passed the PTP review with excellent performance.Two senior peer reviewers of APLAC made a comprehensive,rigorous and detailed review of CNAS’s PTP accreditation activities,and made the on-spot inspection of the review groups in Shanghai and Shenzhen respectively.