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Influence of Microstructures on Thermal Shock and Sintering Behavior of YSZ-based Thermal Barrier Coatings

表面技术 2019年第4期48卷 28-33页

作者： kirsten bobzin Lidong Zhao Mehmet ?te Tim K?nigstein Surface Engineering Institute RWTH Aachen University

In this study, two thermal barrier coatings based on YSZ were produced by using a commercially available agglomerated and sintered powder and a special spray powder prepared by high energy ball milling. Both thermal barrier coatings exhibited similar overall porosities, but significantly different microstructures. Application of the special spray powder prepared by high energy ball milling led to a microstructure with numerous inclusions of semi-molten agglomerates, which introduced a plethora of clusters of fine pores into the coating and several more microstructural defects. This microstructure resulted in a significantly better thermal shock behavior compared to the conventional thermal barrier coating. The heat treatment of both thermal barrier coatings atθ=1150℃for t=100 h led to a sintering of both coatings. The results were reduced overall porosity and significantly increased fracture toughness. A correlation between the fracture toughness of both coatings after the heat treatment and the thermal shock life time could not be identified.

关键词： thermal barrier coating ZrO2-7%Y2O3 high energy ball milling thermal shock

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Influence of direct electric current on wetting behavior during brazing

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Frontiers of Mechanical Engineering 2020年第3期15卷 496-503页

作者： kirsten bobzin Wolfgang WIETHEGER Julian HEBING Lidong ZHAO Alexander SCHMIDT Riza ISKANDAR Joachim MAYER Surface Engineering Institute(IOT) RWTH Aachen University52072 AachenGermany Central Facility for Electron Microscopy RWTH Aachen University52074 AachenGermany

The wetting behavior of liquid metals is of great importance for many processes. For brazing, however, a targeted modification beyond the adjustment of conventional process parameters or the actual set-up was not possible in the past. Therefore, the effect of direct electric current along the surface of a steel substrate on the wetting behavior and the formation of the spreading pattern of an industrial nickel-based filler metal was investigated at a temperature above T = 1000 °C in a vacuum brazing furnace. By applying direct current up to I = 60 A the wetted surface area could be increased and the spreading of the molten filler metal could be controlled in dependence of the polarity of the electric current. The electric component of the Lorentz force is supposed to be feasible reasons for the observed dependence of the electrical polarity on the filler metal spreading direction. To evaluate the influence of the electric current on the phase formation subsequent selective electron microscope analyses of the spreading pattern were carried out.

关键词： brazing electric current assisted wetting Lorentz force

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等离子喷涂AP40生物活性玻璃陶瓷涂层的结构和性能

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无机材料学报 2006年第3期21卷 759-763页

作者：贺定勇赵力东 bobzin kirsten LUGSCHEIDER Erich 北京工业大学材料学院 RWTH Aachen University D-52070 Aachen Germany

采用大气等离子喷涂技术,在TiAl6V4基体上制备了AP40玻璃陶瓷涂层．利用光学显微镜,SEM和XRD分析技术对涂层形貌、显微组织结构和相组成进行了研究．探讨了热处理工艺对涂层组织结构及其性能的影响,并按德国DIN 50160标准进行涂层的拉... 详细信息

采用大气等离子喷涂技术,在TiAl6V4基体上制备了AP40玻璃陶瓷涂层．利用光学显微镜,SEM和XRD分析技术对涂层形貌、显微组织结构和相组成进行了研究．探讨了热处理工艺对涂层组织结构及其性能的影响,并按德国DIN 50160标准进行涂层的拉伸强度试验．结果表明:等离子喷涂AP40玻璃陶瓷涂层在喷涂态,只有较低的结晶度．喷涂工艺对涂层的孔隙率和粉末沉积率有较大的影响．合适的热处理工艺可提高涂层的结晶度,减少孔隙以及提高结合强度．

关键词：生物活性玻璃陶瓷等离子喷涂涂层

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Al_2O_3弥散强化316L不锈钢粉末的高速火焰喷涂

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焊接学报 2006年第9期27卷 43-46页

作者：贺定勇赵力东 Zwick Jochen bobzin kirsten Lugscheider Erich 北京工业大学材料科学与工程学院北京100022 德国亚琛工业大学表面工程研究所德国亚琛d52070

采用高能球磨工艺制备了Al2O3弥散强化316L不锈钢喷涂粉末,并进行高速火焰喷涂(HVOF)试验。研究了弥散强化粉末及其喷涂层的微观组织结构和硬度。采用销-盘磨损试验机测试了涂层的耐磨性能。结果表明,球磨加工后,Al2O3颗粒尺寸大多小于1... 详细信息

采用高能球磨工艺制备了Al2O3弥散强化316L不锈钢喷涂粉末,并进行高速火焰喷涂(HVOF)试验。研究了弥散强化粉末及其喷涂层的微观组织结构和硬度。采用销-盘磨损试验机测试了涂层的耐磨性能。结果表明,球磨加工后,Al2O3颗粒尺寸大多小于1μm,由微米级、亚微米级及纳米级粒子组成并均匀分布在316L不锈钢基体粉末中。随着球磨时间的增加,粉末的显微硬度提高。喷涂后球磨粉末的微观组织结构基本不变,喷涂层的硬度比对应球磨粉末硬度低,其耐磨性明显优于单纯不锈钢粉末涂层。

关键词： Al2O3/316L粉末球磨涂层硬度耐磨

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Correlation between Chemical Glass Components and the Glass Sticking on Sputtered PtIr Physical Vapour Deposition Coatings for Precision Blank Moulding

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Materials Sciences and Applications 2014年第5期5卷 316-329页

作者： kirsten bobzin Nazlim Bagcivan Tobias Brogelmann Tobias Münstermann RWTH Aachen University Surface Engineering InstituteAachenGermany

The increasing demand on high quality optical systems with complex geometries, low tolerances and a low installation space necessitates new replicative production systems for complex optical glass elements. The technology precision blank moulding shows promising properties to comply with these demands on an industrial bulk production. Due to the required high surface quality and low surface roughness of produced optical elements, moulding dies must have comparable low roughness and defect-free surfaces. To reduce wear and chemical interaction with the hot glass, moulding dies are often coated with a thin sputtered physical vapour deposition (PVD) coating. The objective of this research work was to analyze the diffusion behaviour inside different industrially used low-Tg (transformation point) glasses and their interaction with three different noble metal coating systems during an application oriented heating test. Therefore, three different PtIr coating systems with different interlayers (50 nm nickel as reference, 20 nm chromium, without interlayer) were deposited and tested in combination with six different industrially used low-Tg glasses. Using energy-dispersive X-ray spectroscopy (EDS) a diffusion of the light alkali and alkaline earth metals (sodium, potassium, calcium) was detected. The interaction between glass and coating was analyzed by EDS, scanning electron microscopy (SEM) and X-ray diffraction (XRD). The different chemical compositions of the glasses have a significant influence on the interaction between glass and coating system. Several correlations between the chemical composition of the glasses and the amount of glass adhesion on the three coating systems were identified. The percentage of ions allocated to network modifiers lithium oxide, sodium oxide and potassium oxide correlates with the intensity of the interaction between coating and glass. The intensity of glass adhesion on the reference coating system PtIr/Ni is related with the zinc conten

关键词： PtIr PVD Glass Adhesion Precision Blank Moulding

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Hart- und Hochtemperaturlöten und Diffusionsschweißen

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2010年

作者： bobzin kirsten.

来源：畅想之星图书光盘版（南... 评论

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