检索结果-南通市图书馆

International Journal of Minerals,Metallurgy and Materials 2016年第1期23卷 92-101页

作者： Peng Wang Ye-dong He Shun-jie Deng Jin Zhang Beijing Key Laboratory for Corrosion Erosion and Surface Technology University of Science and Technology Beijing

Porous α-Al2O3 thermal barrier coatings （TBCs） containing dispersed Pt particles were prepared by cathode plasma electrolytic deposition （CPED）. The influence of the Pt particles on the microstructure of the coatings and the CPED process were studied. The prepared coatings were mainly composed of α-Al2O3. The average thickness of the coatings was approximately 100 μm. Such single-layer TBCs ex- hibited not only excellent high-temperature cyclic oxidation and spallation resistance, but also good thermal insulation properties. Porous α-Al2O3 TBCs inhibit further oxidation of alloy substrates because of their extremely low oxygen diffusion rate, provide good thermal insu- lation because of their porous structure, and exhibit excellent mechanical properties because of the toughening effect of the Pt particles and because of stress relaxation induced by deformation of the porous structure.

关键词： porous material thermal barrier coatings alumina platinum electrolytic deposition oxidation

Hot Corrosion Behavior of Double-ceramic-layer LaTi_2 Al_(9)O_(19)/YSZ thermal barrier coatings

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2012年第1期25卷 137-142页

作者： XIE Xiaoyun GUO Hongbo GONG Shengkai XU Huibin School of Materials Science and Engineering Key Laboratory of Aerospace Materials&Performance(Ministry of Education)Beihang UniversityBeijing 100191China

LaTi2Al9O19 （LTA） exhibits promising potential as a new kind of thermal barrier coating （TBC） material, due to its excellent high-temperature capability and low thermal conductivity. In this paper, LTA/yttria stabilized zirconia （YSZ） TBCs are produced by atmospheric plasma spraying. Hot corrosion behavior and the related failure mechanism of the coating are investigated. Decomposition of LTA does not occur even after 1 458 hot corrosion cycles at 1 373 K, revealing good chemical stability in molten salt of Na=SO4 and NaCl. However, the molten salt infiltrates to the bond coat, causing dissolving of the thermally grown oxide （TGO） in the molten salt and hot corrosion of the bond coat. As a result, cracking of the TBC occurs within the oxide layer. In conclusion, the ceramic materials LTA and YSZ reveal good chemical stability in molten salts of Na2SO4 and NaCl, and the bond coat plays a significant role in providing protection for the component against hot corrosion in the LTA/YSZ TBCs. LTA exhibits very promising potential as a novel TBC material.

关键词： thermal barrier coatings LaTi2Al9O19 hot corrosion plasma spraying failure

Surface roughness affects metastable non-wetting behavior of silicate melts on thermal barrier coatings

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2022年第2期41卷 469-481页

作者： Shan-Jie Yang Wen-Jia Song Donald B.Dingwell Jian He Hong-Bo Guo School of Materials Science and Engineering Beihang UniversityBeijing 100191China Department of Earth and Environmental Sciences Ludwig-Maximilians-Universita¨t Mu¨nchenMunich 80333Germany Research Institute for Frontier Science Beihang UniversityBeijing 100191China

Airborne silicate pollutants in flight corridors pose a serious threat to aviation safety whose severity is directly linked to the wettability of molten silicates on thermal barrier coatings(TBCs)at high temperatures(1200–2000℃).Despite its importance,the wettability of silicate melt on TBCs has not been well *** particular,the surface morphology characteristics of TBCs can be expected to have a first-order effect on the wettability of silicate melt on such ***,a series of atmospheric plasma spray(APS)yttria-stabilized zirconia(YSZ)TBCs with varying surface roughness were generated through the application of mechanical *** metastable nonwetting behavior of three representative types of airborne silicate ash(volcanic ash,fly ash and a synthetic calcium–magnesium–aluminum–silicates(CMAS)powder)on these TBCs with varying surface roughness was *** was observed that the smoother the surface of TBCs was,the larger the contact angle was with the molten silicate melts,and consequently,the smaller the area of damage was on the ***,the reduction in TBCs surface roughness(here via mechanical polishing)led to an improvement in the wetting and spreading resistance of TBCs to silicate melts at high *** support of these observations and conclusions,the surface morphology of the TBC(both before and after polishing)had been characterized,and the mechanism of the surface roughness-dependence of wettability had been *** results should contribute to reducing the deposition rate of silicate melt on TBCs,thus extending the lifetime of turbine blades and reducing maintenance costs.

关键词： thermal barrier coatings Surface roughness Silicate melts Metastable wettability Calcium–magnesium–aluminum–silicates(CMAS)mitigation method

Improvement strategy on thermophysical properties of A_(2)B_(2)O_(7)-type rare earth zirconates for thermal barrier coatings applications:A review

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2024年第5期31卷 1147-1165页

作者： Zijian Peng Yuhao Wang Shuqi Wang Junteng Yao Qingyuan Zhao Enyu Xie Guoliang Chen Zhigang Wang Zhanguo Liu Yaming Wang Jiahu Ouyang School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China School of Materials and Metallurgical Engineering Inner Mongolia University of Science&TechnologyBaotou 014010China

The A_(2)B_(2)O_(7)-type rare earth zirconate compounds have been considered as promising candidates for thermal barrier coating(TBC) materials because of their low sintering rate,improved phase stability,and reduced thermal conductivity in contrast with the currently used yttria-partially stabilized zirconia (YSZ) in high operating temperature *** review summarizes the recent progress on rare earth zirconates for TBCs that insulate high-temperature gas from hot-section components in gas *** on the first principles,molecular dynamics,and new data-driven calculation approaches,doping and high-entropy strategies have now been adopted in advanced TBC materials *** this paper,the solid-state heat transfer mechanism of TBCs is explained from two aspects,including heat conduction over the full operating temperature range and thermal radiation at medium and high *** paper also provides new insights into design considerations of adaptive TBC materials,and the challenges and potential breakthroughs are further highlighted for extreme environmental *** for improving thermophysical performance are proposed in two approaches:defect engineering and material compositing.

关键词： rare earth zirconates thermal barrier coatings defect engineering doping and compositing thermal conductivity thermal expansion

thermal oxidation description methodology of thermal barrier coatings on gas turbine blades considering service characteristics

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2024年第6期37卷 410-424页

作者： Qiannan TAO Yanrong WANG Dasheng WEI Shun YANG School of Energy and Power Engineering Beihang UniversityBeijing 100191China Jiangxi Research Institute of Beihang University Nanchang 330096China

Predicting the thickness of thermally Grown Oxide(TGO)and the residual stresses induced by TGO growth in the thermal barrier coatings(TBCs)is significant work in analyzing the failure of *** practical applications,the operating temperature,oxygen partial pressure,aluminium content in TBCs,and porosity of the topcoat affect the oxidation ***,a novel oxidation rate model is proposed to describe the effect of such *** parameters in the proposed model were fitted with isothermal degradation test data from prior ***,a method for calculating the residual stress in a disk-shaped specimen was developed based on the oxidized growth strain model and the oxidized ***,a variable-temperature oxidation experiment was performed to validate the new oxidation *** average error between the predicted and experimental thicknesses is approximately 10%,and the average error between the residual stresses is 30%.Under the variable-temperature condition,the error between the predicted thickness and the average experimental thickness is 3.9%.

关键词： thermal barrier coatings Oxidation Gas turbine Residual stresses Sintering

Plasma spray-physical vapor deposition toward advanced thermal barrier coatings:a review

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2020年第5期39卷 479-497页

作者： Mei-Jun Liu Gao Zhang Yan-Hong Lu Jia-Qi Han Guang-Rong Li Cheng-Xin Li Chang-Jiu Li Guan-Jun Yang State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and EngineeringXi’an Jiaotong UniversityXi'an 710049China

Plasma spray–physical vapor deposition(PS–PVD)is a unique technology that enables highly tailorable functional films and coatings with various rare metal elements to be *** technology bridges the gap between conventional thermal spray and vapor deposition and provides a variety of coating microstructures composed of vapor,liquid,and solid deposition *** PS–PVD technique serves a broad range of applications in the fields of thermal barrier coatings(TBCs),environmental barrier coatings(EBCs),oxygen permeable films,and electrode *** also represents the development direction of high-performance TBC/EBC preparation *** the PS–PVD technique,the composition of the deposition unit determines the microstructure of the coating and its *** coating materials are injected into a nozzle and transported into the plasma jet,the deposition unit generated by a coating material is affected by the plasma jet ***,there is no direct in situ measurement method of material transfer and deposition processes in the PS–PVD plasma jet,because of the extreme conditions of PS–PVD such as a low operating pressure of*100 Pa,temperatures of thousands of degrees,and a thin and high-velocity *** the difficulties,the transport and transformation behaviors of the deposition units were also researched by optical emission spectroscopy,observation of the coating microstructure and other *** paper reviews the progress of PS–PVD technologies considering the preparation of advanced thermal barrier coatings from the perspective of the transport and transformation behaviors of the deposition *** development prospects of new high-performance TBCs using the PS–PVD technique are also discussed.

关键词： Plasma spray–physical vapor deposition (PSPVD) Deposition unit Cross-domain behavior Deposition mechanism thermal barrier coatings (TBCs)

Reliability assessment on interfacial failure of thermal barrier coatings

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 2016年第5期32卷 915-924页

作者： Jin-Wei Guo Li Yang Yi-Chun Zhou Li-Min He Wang Zhu Can-Ying Cai Chun-Sheng Lu Key Laboratory of Key Film Materials & Application for Equipment (Hunan Province) School of Materials Science and Engineering Xiangtan UniversityXiangtan 411105China Key Laboratory of Low Dimensional Materials & Application Technology (Ministry of Education) School of Materials Science and Engineering Xiangtan UniversityXiangtan 411105China Beijing Institute of Aeronautical Materials Beijing 100095China Department of Mechanical Engineering Curtin UniversityPerthWestern Australia 6845Australia

thermal barrier coatings（TBCs） usually exhibit an uncertain lifetime owing to their scattering mechanical properties and severe service conditions. To consider these uncertainties, a reliability assessment method is proposed based on failure probability analysis. First, a limit state equation is established to demarcate the boundary between failure and safe regions, and then the failure probability is calculated by the integration of a probability density function in the failure area according to the first- or second-order *** is shown that the parameters related to interfacial failure follow a Weibull distribution in two types of TBC. The interfacial failure of TBCs is significantly affected by the thermal mismatch of material properties and the temperature drop in service.

关键词： Reliability assessment thermal barrier coatings Interfacial failure

Effects of heat treatment on the corrosion resistance of carbon steel coated with LaMgAl_(11)O_(19) thermal barrier coatings

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2015年第10期22卷 1050-1059页

作者： Liang-liang Huang Hui-min Meng Li-kang Liang Sen Li Jin-hui Shi Institute for Advanced Materials and Technology University of Science and Technology Beijing

LaMgAl11O19thermal barrier coatings（TBCs） were applied to carbon steels with a NiCoCrAlY bond coat by plasma spraying. The effects of heat treatment on the corrosion resistance of carbon steel coated with LaMgAl11O19TBCs were investigated in 3.5wt% Na Cl solution using polarization curves, electrochemical impedance spectroscopy（EIS）, scanning electron microscopy（SEM）, and X-ray diffraction（XRD）. The results show that a large number of cracks are found in the LaMgAl11O19TBCs after the samples are heat-treated, including some through-thickness cracks. The corrosion forms of the as-sprayed and heat-treated TBCs are uniform corrosion and pitting corrosion, respectively. The as-sprayed TBCs exhibit three EIS time constants after being immersed for less than 7 d, and then a new time constant appears because of steel substrate corrosion. When the immersion time is increased to 56 d, a Warburg impedance（W） component appears in the EIS data. The EIS data for the heat-treated TBCs exhibit only two time constants after the samples are immersed for less than 14 d, and a new time constant appears when the immersion time is increased further. The heat treatment reduces the corrosion resistance of carbon steel coated with LaMgAl11O19TBCs. The corrosion products are primarily γ-Fe OOH and Fe3O4.

关键词： thermal barrier coatings carbon steel corrosion pl

Microstructure and thermal cycling behavior of nanostructured yttria partially stabilized zirconia (YSZ) thermal barrier coatings

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2010年第S1期28卷 198-201页

作者：孙杰张丽丽赵丹 School of Environmental and Chemical Engineering Shenyang Ligong University

Nanostructured yttria partially stabilized zirconia(YSZ) coatings were prepared by atmospheric plasma spraying(APS) using the conglomeration made by zirconia nanoparticle as the raw *** measurement methods,which consisted of scanning electron microscopy(SEM),transmission electron microscopy(TEM) and thermal cycling behavior,were used to character the morphology,composition and thermal oxidation behavior of the powder and the *** the results,it was shown that the YSZ coating was the laminar structure,and the elements distribution in the bond and top coat were *** YSZ coatings were composed of fine grains with size ranging from 30 to 110 *** laminar layers with columnar grains were surrounded with unmelted parts of the nanostructured powder and some equiaxed *** the as-sprayed nanostructured zirconia coatings,there existed pores that were less than 1 μ*** cracks were observed on some of the crystal *** cyclic oxidation experiment showed that the nanostructured coating had longer thermal cycling lifetime to exhibit the promising thermal cyclic oxidation *** failure of the nanostructured TBC was similar to the failure of conventional APS TBC.

关键词： nanostructure yttria stabilized zirconia isothermal oxidation thermal barrier coatings rare earths

Finite Element Simulation on thermal Fatigue of a Turbine Blade with thermal barrier coatings

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2014年第4期30卷 371-380页

作者： L.Yang Q.X.Liu Y.C.Zhou W.G.Mao C.Lu Key Laboratory of Low Dimensional Materials & Application Technology(Ministry of Education) Xiangtan University Faculty of Materials Optoelectronic & PhysicsXiangtan University Department of Mechanical Engineering Curtin University

In this paper, a finite element model was developed for a turbine blade with thermal barrier coatings to investigate its failure behavior under cyclic thermal loading. Based on temperature and stress fields obtained from finite element simulations, dangerous regions in ceramic coating were determined in terms of the maximum principal stress criterion. The results show that damage preferentially occurs in the chamfer and rabbet of a turbine blade with thermal barrier coatings and its thermal fatigue life decreases with the increase of thermal stress induced by high service temperature.

关键词： Turbine blade thermal barrier coatings Finite element model thermal fatigue Life prediction