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Progress in terahertz nondestructive testing: A review
Shuncong ZHONG
《机械工程前沿(英文)》 2019年 第14卷 第3期 页码 273-281 doi: 10.1007/s11465-018-0495-9
关键词: terahertz pulsed imaging (TPI) nondestructive testing (NDT) composite material thermal barrier coating
Elastic modulus and thermal stress in coating during heat cycling with different substrate shapes
Daniel GAONA,Alfredo VALAREZO
《机械工程前沿(英文)》 2015年 第10卷 第3期 页码 294-300 doi: 10.1007/s11465-015-0351-0
The elastic modulus of a deposit (Ed) can be obtained by monitoring the temperature (?T) and curvature (?k) of a one-side coated long plate, namely, a one-dimensional (1D) deformation model. The aim of this research is to design an experimental setup that proves whether a 1D deformation model can be scaled for complex geometries. The setup includes a laser displacement sensor mounted on a robotic arm capable of scanning a specimen surface and measuring its deformation. The reproducibility of the results is verified by comparing the present results with Stony Brook University Laboratory’s results. The ?k-?T slope error is less than 8%, and the Ed estimation error is close to 2%. These values reveal the repeatability of the experiments. Several samples fabricated with aluminum as the substrate and 100MXC nanowire (Fe and Cr alloy) as the deposit are analyzed and compared with those in finite element (FE) simulations. The linear elastic behavior of 1D (flat long plate) and 2D (squared plate) specimens during heating/cooling cycles is demonstrated by the high linearity of all ?k-?T curves (over 97%). The Ed values are approximately equal for 1D and 2D analyses, with a median of 96 GPa and standard deviation of 2 GPa. The correspondence between the experimental and simulated results for the 1D and 2D specimens reveals that deformation and thermal stress in coated specimens can be predicted regardless of specimen geometry through FE modeling and by using the experimental value of Ed. An example of a turbine-blade-shaped substrate is presented to validate the approach.
关键词: in-plane Young’s modulus curvature temperature thermal stress coating
Effect of TGO on the tensile failure behavior of thermal barrier coatings
Le WANG, Yuelan DI, Ying LIU, Haidou WANG, Haoxing YOU, Tao LIU
《机械工程前沿(英文)》 2019年 第14卷 第4期 页码 452-460 doi: 10.1007/s11465-019-0541-2
关键词: thermally grown oxides thermal barrier coatings acoustic emission technology digital image correlation pores
Jia XU,Zhen-yu ZHOU,Zhong-yu PIAO
《机械工程前沿(英文)》 2016年 第11卷 第3期 页码 227-232 doi: 10.1007/s11465-016-0395-9
The accumulated damage process of rolling contact fatigue (RCF) of plasma-sprayed coatings was investigated. The influences of surface roughness, loading condition, and stress cycle frequency on the accumulated damage status of the coatings were discussed. A ball-on-disc machine was employed to conduct RCF experiments. Acoustic emission (AE) technique was introduced to monitor the RCF process of the coatings. AE signal characteristics were investigated to reveal the accumulated damage process. Result showed that the polished coating would resist the asperity contact and remit accumulated damage. The RCF lifetime would then extend. Heavy load would aggravate the accumulated damage status and induce surface fracture. Wear became the main failure mode that reduced the RCF lifetime. Frequent stress cycle would aggravate the accumulated damage status and induce interface fracture. Fatigue then became the main failure mode that also reduced the RCF lifetime.
关键词: accumulated damage spray coating rolling contact fatigue acoustic emission
Preparation and characterization of nanocrystalline ZrO2-7%Y2O3 powders for thermal barrier coatings
Kirsten BOBZIN, Lidong ZHAO, Thomas SCHLAEFER, Thomas WARDA
《机械工程前沿(英文)》 2011年 第6卷 第2期 页码 176-181 doi: 10.1007/s11465-011-0220-4
High-energy ball milling is an effective method to produce nanocrystalline oxides. In this study, a conventional ZrO2-7%Y2O3spray powder was ball-milled to produce nanocrystalline powders with high levels of crystalline disorders for deposition of thermal barrier coatings. The powder was milled both with 100Cr6 steel balls and with ZrO2-3%Y2O3 ceramic balls as grinding media. The milling time was varied in order to investigate the effect of the milling time on the crystallite size. The powders were investigated in terms of their crystallite sizes and morphologies by X-ray diffraction analysis (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results show that under given milling conditions the powder was already nanostructured after 40 min milling. The crystallite size decreased significantly with increasing milling time within first 120 min. After that, a further increase of milling time did not lead to a significant reduction of the crystallite size. Ball-milling led to lattice microstrains. Milling with the steel balls resulted in finer nano-sized crystal grains, but caused the contamination of the powder. The nano-sized crystal grains coarsened during the heat-treatment at 1250°C.
关键词: nanostrucured powders yttria stabilized zirconia (YSZ) high-energy ball milling thermal barrier coatings
Wenjing Lu, Yawar Abbas, Muhammad Farooq Mustafa, Chao Pan, Hongtao Wang
《环境科学与工程前沿(英文)》 2019年 第13卷 第2期 doi: 10.1007/s11783-019-1108-5
• Applications of non-thermal plasma reactors for reduction of VOCs were reviewed. • Dielectric barrier discharge (DBD) plasma was considered. • Effect of process parameters was studied. • Effect of catalysts and inhibitors were evaluated.
关键词: Non-thermal plasma (NTP) Dielectric barrier discharge (DBD) Volatile organic compounds (VOCs) Abatement Input power
Time of flight improved thermally grown oxide thickness measurement with terahertz spectroscopy
《机械工程前沿(英文)》 2022年 第17卷 第4期 doi: 10.1007/s11465-022-0705-3
关键词: thermal barrier coatings thermally grown oxide terahertz spectroscopy time of flight
通过 B 位Ta置换对 AB O4型EuNbO4的热学和力学性质进行优化 Article
陈琳, 冯晶
《工程(英文)》 2020年 第6卷 第2期 页码 177-184 doi: 10.1016/j.eng.2019.12.006
铁弹性的ABO4型RETaO4陶瓷和RENbO4陶瓷(RE表示稀土)是具有潜在应用价值的热障涂层(TBC)材料,研究人员正在对其进行大量研究。结果显示, RETaO4陶瓷的力学性质优于RENbO4陶瓷的力学性质。在本研究中,我们通过B位钽(Ta)置换对利用固相法(SSR)制备的EuNbO4陶瓷的热学和力学性质进行优化。我们使用X射线衍射(XRD)法和拉曼光谱技术对所制备的晶体结构进行确认,并利用扫描电子显微镜(SEM)对结构表面的微观形貌进行观察。结果表明,通过B位Ta置换可以有效提高EuNbO4陶瓷的杨氏模量和热膨胀系数(TEC),且其最大值分别为169 GPa和1.12×10−5 K−1(1200 ℃); EuNbO4陶瓷的热导率被降低至1.52 W·K–1·m–1(700 ℃),且材料的抗热辐射能力得到了改善。我们建立了声子热扩散系数与温度之间的关系,用以通过消除热辐射效应来确定声子本征热导率。研究结果表明,通过B位Ta置换能够有效优化EuNbO4的热学和力学性质,从而使得此种材料在将来可成为一种高温结构陶瓷材料。
Anticorrosive composite self-healing coating enabled by solar irradiation
《化学科学与工程前沿(英文)》 2022年 第16卷 第9期 页码 1355-1366 doi: 10.1007/s11705-022-2147-1
关键词: self-healing coating phase transition photothermal effect corrosion protection
《能源前沿(英文)》 doi: 10.1007/s11708-023-0901-9
关键词: interconnector coating plasma spray electrochemical performance Cr diffusion inhibition solid oxide cells (SOCs)
《环境科学与工程前沿(英文)》 2022年 第16卷 第12期 doi: 10.1007/s11783-022-1591-y
● A novel PRB configuration based on passive convergent flow effect was proposed.
关键词: Passive convergence-permeable reactive barrier (PC-PRB) Permeable reactive barrier configuration Numerical simulation Hydraulic performance evaluation Sensitivity analysis
Hydrogen production from methanol through dielectric barrier discharge
Baowei WANG, Xu ZHANG, Haiying BAI, Yijun Lü, Shuanghui HU
《化学科学与工程前沿(英文)》 2011年 第5卷 第2期 页码 209-214 doi: 10.1007/s11705-010-1018-3
《能源前沿(英文)》 2022年 第16卷 第5期 页码 876-877 doi: 10.1007/s11708-022-0832-x
《环境科学与工程前沿(英文)》 2023年 第17卷 第11期 doi: 10.1007/s11783-023-1731-z
● A 2D finite-element solute transport model, PRB-Trans, is developed.
关键词: Passive convergence-permeable reactive barrier Numerical modeling Hydraulic behavior assessment Pollutant treatment performance evaluation Influential factors analysis
Degradation of metronidazole by dielectric barrier discharge in an aqueous solution
Zhipeng Yang, Anxing Lai, Hangyu Chen, Youxiang Yan, Ye Yang, Weiwei Zhang, Lei Wang
《环境科学与工程前沿(英文)》 2019年 第13卷 第3期 doi: 10.1007/s11783-019-1117-4
The discharge characteristics during the degradation of MNZ by DBD were investigated. Increasing the discharge frequency can promote the degradation of MNZ. MNZ removal reaches 99.1% at the initial concentration of 40 ppm within 120 min. Coexisting organic matter inhibits the degradation of MNZ. The energy efficiency of DBD for MNZ removal is higher than other technologies.
关键词: Dielectric barrier discharge Antibiotic Metronidazole Water treatment
标题 作者 时间 类型 操作
Elastic modulus and thermal stress in coating during heat cycling with different substrate shapes
Daniel GAONA,Alfredo VALAREZO
期刊论文
Effect of TGO on the tensile failure behavior of thermal barrier coatings
Le WANG, Yuelan DI, Ying LIU, Haidou WANG, Haoxing YOU, Tao LIU
期刊论文
Accumulated damage process of thermal sprayed coating under rolling contact by acoustic emission technique
Jia XU,Zhen-yu ZHOU,Zhong-yu PIAO
期刊论文
Preparation and characterization of nanocrystalline ZrO2-7%Y2O3 powders for thermal barrier coatings
Kirsten BOBZIN, Lidong ZHAO, Thomas SCHLAEFER, Thomas WARDA
期刊论文
A review on application of dielectric barrier discharge plasma technology on the abatement of volatile
Wenjing Lu, Yawar Abbas, Muhammad Farooq Mustafa, Chao Pan, Hongtao Wang
期刊论文
Time of flight improved thermally grown oxide thickness measurement with terahertz spectroscopy
期刊论文
Plasma spray coating on interconnector toward promoted solid oxide fuel cells and solid oxide electrolysis
期刊论文
Passive convergence-permeable reactive barrier (PC-PRB): An effective configuration to enhance hydraulic
期刊论文
Hydrogen production from methanol through dielectric barrier discharge
Baowei WANG, Xu ZHANG, Haiying BAI, Yijun Lü, Shuanghui HU
期刊论文
Erratum to: Enhancing the photoelectrochemical performance of p-silicon through TiO coating decorated
期刊论文
Numerical modeling and performance evaluation of passive convergence-permeable reactive barrier (PC-PRB
期刊论文