Mo、Ni含量与Ti(C,N)基金属陶瓷组织和性能之间的关系

本文研究了Mo、Ni含量对Ti（C，N）基金属陶瓷组织和性能的影响．结果表明，Mo、Ni含量对组织和性能有很大影响，化学成分决定了组织和性能．     

基岩型富氦气藏形成条件

氦气是一种广泛应用于军工、航天、医疗等高新技术产业的稀缺战略资源,但其在世界分布极其不均,中国是贫氦国家面临着严峻的氦气供给安全问题。在系统总结前人研究成果基础上,结合本次实验分析对比了世界上最成熟的氦气生产气田（美国潘汉德—胡果顿气田）与中国氦气生产潜力较大的东坪气田,探讨两者的成藏要素及富氦机理。结果发现：两者均是以天然气作为载体气的基岩型富氦气藏,储层物性好,均发育以膏岩为主的低渗致密的良好盖层。两者的差异性在于,前者花岗岩形成年代更为古老,尤其是碳酸盐岩地层中富含的花岗岩碎屑,其年龄集中在元古宙,平均比东坪气田花岗岩的形成年代早400 Ma;前者氦气运移模式偏向于单一的饱和地下水脱溶释放,而后者存在“过路”古老花岗岩储层的天然气“萃取”释放。两者对比之下,提出形成年代久远的高U、Th氦源岩、充足的载体气、良好的基岩风化壳储层与致密的盖层,和充足的地下水（边底水）作为媒介参与氦气运移,是形成基岩型富氦气藏的必要条件。     

Solution growth of millimeter-scale Na2SiF6 single crystals for Mn4+-doping as red phosphor

The cation exchange method has been demonstrated to be efficient in doping Mn⁴⁺ ions into various fluorides to synthesize the red-emitting LED phosphors. This paper, however, reports the challenge in using this method to dope Mn⁴⁺ into the Na₂SiF₆ single crystals, to prepare the fluoride phosphor in single-crystal form, a state-of-the-art study in the white LED lighting field. The millimeter-sized Na₂SiF₆ single crystals with a uniform columnar morphology (2–3 mm in length) were successfully grown in solution by a slow cooling process after optimizing the precursors. Then, the crystals were soaked in the HF solution dissolved with K₂MnF₆ to implement Mn⁴⁺-doping via the cation exchange process. Evaluation of the Mn⁴⁺-doping behavior reveals that the Mn⁴⁺ ↔ Si⁴⁺ cation exchange is less efficient in the case of single crystal host compared with the polycrystalline powdery ones and by-reactions also occur which generates new phases. The Na₂SiF₆ single crystals doped with Mn⁴⁺ exhibit a series of discrete sharp peaks with intense zero phonon line emission at 617 nm under 450 nm blue irradiation. This study may trigger the exploration of new single crystal fluoride phosphor.     

A review on microwell and microfluidic geometric array fabrication techniques and its potential applications in cellular studies

The ability to trap precise quantities of cells or particles into confined areas has numerous applications for biological purposes. In particular, single cell trapping has received considerable attention because it permits the study of heterogeneity in a population, while trapping larger groups of cells have been used to form aggregates. Among several methods, the use of microwell offers a simple platform to capture cells or particles using hydrodynamic forces. This review examines the use of microwells in both static and microfluidic environments, and the application of microfluidic geometric arrays for trapping. This paper discusses the design and fabrication methods of microwells and compares the trapping and release techniques used in both static and microfluidics‐integrated microwells. Finally, we will summarize novel microfluidic geometric arrays used to capture cells or particles through hydrodynamic trapping.     

Effect of coke orientation on the electrochemical properties of lithium-ion battery anode

Journal of Applied Electrochemistry - In this study, Needle and Regular coke, which has different crystalline and orientation characteristics, were graphitized, and the effect of crystal changes on...     

Performance of biomimetic coating modified fiber incorporated styrene butadiene styrene modified asphalt

This study reports the effect of polydopamine bionic coating and γ-methacryloxypropyltrimethoxysilane (KH570) composite modified polyacrylonitrile (PAN) fiber as a secondary modifier on the performance of styrene-butadiene-styrene (SBS) modified asphalt. Dynamic shear rheometer test indicated the complex shear modulu, storage modulus, and loss modulus of modified PAN (KD-PAN) incorporated SBS modified asphalt was increased by 12.4, 20.5, and 11.2%, respectively compared with PAN/SBS modified asphalt. The master curve of G^* of fiber/SBS composite modified asphalt shows that the deformation resistance of KD-PAN/SBS modified asphalt is greater than that of PAN/SBS modified asphalt in the entire loading frequency range. The cone penetration test showed significantly enhanced shear strength of KD-PAN/SBS modified asphalt. The adhesion work test results and SEM images of interface between fiber and SBS modified asphalt revealed that the adhesion effect of KD-PAN and SBS modified asphalt is better than that of PAN and SBS modified asphalt. SEM and AFM images of fiber further showed that the fiber surface becomes rough after modification. The increased surface roughness of KD-PAN facilitated the adherence of SBS modified asphalt to it, which in turn led to the enhanced performance of KD-PAN/SBS composite modified asphalt at the same fiber content and temperature.     

Preparation and balanced mechanical properties of solid and foamed isotactic polypropylene/SEBS composites

This study presents a self-designed foaming apparatus and routes to manufacture foamed isotactic polypropylene (iPP) blends with uniform and dense cells, using styrene-ethylene-butadiene-styrene (SEBS) block copolymer as toughening additive. The addition of SEBS can clearly enhance the impact strength of solid iPP, iPP blends with a 20 wt% SEBS has obtained high notched impact strength of 75 kJ/m², which is ca. 16 times larger than that of neat iPP. Relatively fine microcellular iPP-SEBS foams with the average cell size of several micrometers, and the cell density of 10⁹ cells/cm³ were fabricated using a batch foaming procedure. Moreover, using our self-designed mold and compression foaming method, iPP-SEBS foams with balanced mechanical properties were produced. With the increasing of SEBS, tensile strength and flexural strength were slightly decreased, but the impact strength was increased clearly. The balanced mechanical properties between stiffness and toughness were achieved after compression foaming.     

Effect of nano fillers on the properties of polytetrafluoroethylene composites: Experimental and theoretical simulations

Polytetrafluoroethylene (PTFE) has excellent corrosion resistance and a low coefficient of friction; however, its high wear rate and low hardness severely limit its use. In the work, nano particles were used as fillers for PTFE. The composites were prepared by the homogeneous mixing of PTFE and other fillers and sintered at high temperatures. The work aimed to investigate the effect of various nano fillers (nanocarbon powders, graphene, fullerene, nano graphite powders, and nano copper powders) on the mechanical, thermal, and frictional properties of composites. The results of the experiments showed that the addition of graphene could improve the stress and strain values of the composites, and all the nano fillers could improve the thermal conductivity of the PTFE composites. The friction experiments showed that fullerenes could significantly improve the wear resistance of PTFE composites. In the theoretical simulation, the thermal conductivity of PTFE composites was predicted using ANSYS software, with the changes in the temperature and friction force in the friction process. The theoretical simulation results matched with the experimental values, which proved the accuracy of the theoretical simulations.     

车桥用水性单组分底面合一防锈涂料的制备与研究

针对车桥防护涂层的涂装特点,采用热融合接枝技术制备了一种稳定共融的水性单组分底面合一树脂新体系,并以该树脂为主要成膜物,通过正交实验优化涂料配方制备了车桥用水性单组分底面合一防锈涂料,阐述了其制备工艺并探讨了催干剂体系、防锈颜料体系和增稠触变体系对涂料以及涂膜性能的影响。     

商用车涂装线用高固体分溶剂型涂料的开发与应用现状

针对目前大部分商用车涂装线喷涂设备老旧,工艺紧凑简陋,温湿度控制较差,施工环境对高固体分涂料的要求更高。本文介绍了商用车涂装线用高固体分涂料的开发关键点和改进方法以及在现场的喷涂应用情况,发现通过合理调整和优化配方,高固体分涂料在商用车老旧涂装线上手工或旋杯喷涂,漆膜外观和性能同样表现优异,能达到常规溶剂型涂料的应用水平。另外,高固体分涂料配合 RTO尾气焚烧装置,涂装 VOCs排放大幅降低,可以达到国家环保要求。