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Low-temperature growth of stoichiometric aluminum nitride films prepared by magnetic-filtered cathodic arc ion plating

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Rare Metals 2016年第7期35卷 520-525页

作者： Wan-Qi Qiu Zhong-Wu Liu ke-song zhou School of Materials Science and Engineering South China University of Technology New Materials Research Department Guangzhou Research Institute of Nonferrous Metals

A1N films were prepared on Si（100） and quartz glass substrates with high deposition rate of 30 nm-min-I at the temperature of below 85 ℃ by the magnetic-filtered cathodic arc ion plating （FCAIP） method. The as-deposited A1N films show very smooth surface and almost no macrodroplets. The films are in amorphous state, and the formation of A1N is confirmed by Nls and A12p X-ray photoelectron spectroscopy （XPS）. The XPS depth profile analysis shows that oxygen is mainly absorbed on the A1N surface. The A1N film has A1 and N concentrations close to the stoichiometric ratio with a small amount of A1203. The prepared A1N films are highly transparent over the wave- length range of 210-990 nm. The optical transmission spectrum reveals the bandgap of 6.1 eV. The present technique provides a good approach to prepare large-scale A1N films with controlled structure and good optical properties at low temperature.

关键词： A1N film Stoichiometric ratio Binding energy Ion plating Filter

Pressure infiltration of molten aluminum for densification of environmental barrier coatings

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Journal of Advanced Ceramics 2022年第1期11卷 145-157页

作者： Lin DONG Mei-Jun LIU Xiao-Feng ZHANG Xue-Shi ZHUO Jia-Feng FAN Guan-Jun YANG ke-song zhou State key Laboratory for Mechanical Behavior ofMaterials School ofMaterials Science and EngineeringXi’an Jiaotong UniversityXi’an 710049China National Engineering Laboratory for Modern Materials Surface Engineering Technology Institute of New MaterialsGuangdong Academy of ScienceGuangzhou 510650China

Environmental barrier coatings(EBCs)effectively protect the ceramic matrix composites(CMCs)from harsh engine environments,especially steam and molten ***,open pores inevitably formed during the deposition process provide the transport channels for oxidants and corrosives,and lead to premature failure of *** research work proposed a method of pressure infiltration densification which blocked these open pores in the *** results showed that it was difficult for aluminum to infiltrate spontaneously,but with the increase of external gas pressure and internal vacuum simultaneously,the molten aluminum obviously moved forward,and finally stopped infiltrating at a depth of a specific *** on the wrinkled zigzag pore model,a mathematical relationship between the critical pressure with the infiltration depth and the pore intrinsic geometry was *** infiltration results confirmed this relationship,indicating that for a given coating,a dense thick film can be obtained by adjusting the internal and external gas pressures to drive a melt infiltration.

关键词： infiltration process channel pore densification pressure assistant environmental barrier coating(EBC)

Thermal insulation performance of 7YSZ TBCs adjusted via Al modification

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Rare Metals 2023年第3期42卷 994-1004页

作者： Jun-Gui Zhang Xi Tan Xiu-Juan Fan Jie Mao Chun-Ming Deng Min Liu ke-song zhou Xiao-Feng Zhang Institute of New Materials The Key Lab of Guangdong for Modern SurfaceEngineering TechnologyGuangdong Academy of SciencesNational Engineering Laboratory of Modern Materials Surface Engineering TechnologyGuangzhou 510651China

ZrO_(2)-7 wt% Y_(2)O_(3)(7YSZ)thermal barrier coatings(TBCs)with three different structures were prepared by atmospheric plasma spraying(APS),electron beam physical vapor deposition(EB-PVD)and plasma spray-physical vapor deposition(PS-PVD).Al films were deposited onto the top 7YSZ TBCs by magnetron sputtering,and the Al-deposited 7YSZ TBCs were subjected to vacuum heat *** effects of Al modification on the thermal insulation properties of 7YSZ TBCs were *** results showed that Al modification could significantly improve the thermal insulation of 7YSZ TBCs at 1000℃.Moreover,the maximum improvement of thermal insulation for PS-PVD 7YSZ TBCs was approximately 100℃,but the improvement decreased with increasing *** is mainly because with increasing temperature,the rate of radiation heat transfer increases,and the effects of convection heat transfer and thermal conductivity on thermal insulation are *** the same temperature,Al modification of PS-PVD7YSZ TBCs provides better temperature insulation than those of APS 7YSZ TBCs and EB-PVD 7YSZ TBCs because of its wider and deeper inter-columnar *** the temperature was 12000C,Al modification still caused a good insulation effect in PS-PVD 7YSZ TBCs;the improvement was approximately 50℃,but in APS and EB-PVD 7YSZ TBCs,the insulation effect disappeared.

关键词： Al modification Thermal barrier coatings(TBCs) Thermal insulation Inter-columnar gap

Anti-sand erosion performance and crack propagation mechanism of Cr/CrN/Cr/CrAlN multilayer coating

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Anti-sand erosion performance and crack propagation mechanis...

Preparation of Al2O3 nanowires on 7YSZ thermal barrier coatings against CMAS corrosion

第四届粤港澳大湾区真空科技创新发展论坛暨2020年广东省真空学会学术年会

作者：王迪 song-sheng Lin 田甜杨洪志 Yue Hong Ming-jiang Dai ke-song zhou The key Lab of Guangdong for Modern Surface Engineering Technology National Engineering Laboratory for Modern Materials Surface Engineering TechnologyInstitute of New MaterialsGuangdong Academy of Sciences School of Materials Science and Engineering Xi'an University of Technology

In this work,the Cr/CrN/Cr/CrAlN multilayer coatings with different modulation ratios were prepared by arc ion *** microstructure of coatings were analyzed by scanning electron microscope(SEM) and transmission electron microscope(TEM).The mechanical properties of the coatings were tested by Vickers micro-hardness tester and scratch *** stress changes during the coating process was studied by the finite element method and the failure mechanism was also *** results show that the Cr/CrN/Cr/CrAlN multilayer coatings have a high hardness(greater than 3000 HV) and good bonding properties(around 80 N).In addition,it was found that the sand erosion resistance of the multilayer coating is significantly higher than that of the uncoated sample according to the sand erosion *** them,the sand erosion resistance of the Cr/CrN/Cr/CrAIN coating is 5 times that of the titanium alloy substrate at 90°.And the dynamic response and stress field of the coating under the impact of single particles(Al O) were studied by numerical *** cause of coating cracking was determined,and the crack resistance mechanism of the coating was analyzed from crack growth morphology according to crack growth and stress analysis.

关键词： multilayer coating toughen sand erosion fracture mechanism

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Transactions of Nonferrous Metals Society of China 2019年第11期29卷 2362-2370页

作者： Xiao-feng ZHANG Shao-peng NIU Zi-qian DENG Min LIU Hong LI Chun-ming DENG Chang-guang DENG ke-song zhou National Engineering Laboratory for Modern Materials Surface Engineering Technology Key Laboratory of Guangdong for Modern Surface Engineering TechnologyGuangdong Institute of New MaterialsGuangzhou 510650China

The commonly-employed material for thermal barrier coatings(TBCs)is 7 wt.%Y2O3 ZrO2(7YSZ),generally deposited by electron beam-physical vapor deposition(EB-PVD).Due to the increasing demand for higher operating temperature in aero-derivative gas turbines,a lot of effort has been made to prevent the premature failure of columnar 7YSZ TBCs,which is induced by the microstructure degradation,sintering and spallation after the deposition of infiltrated siliceous mineral(consisting of calcium magnesium aluminum silicate(CaO MgO Al2O3 SiO2,i.e.,CMAS)).A new method called Al-modification for columnar 7YSZ TBCs against CMAS corrosion was *** Al film was magnetron-sputtered on the surface of the columnar 7YSZ TBCs,followed by performing vacuum heat treatment of the Al-deposited *** the heat treatment,the molten Al reacted with ZrO2 to formα-Al2O3 overlay that effectively hindered CMAS ***,the Al film could evaporate and re-nucleate,leading to the generation of Al2O3 nanowires,which further restrained the moving of molten CMAS.

关键词： thermal barrier coating CMAS corrosion Al-modification Al2O3 nanowires

Effect of Al-deposition on erosion resistance of plasma sprayed thermal barrier coating

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Transactions of Nonferrous Metals Society of China 2015年第8期25卷 2587-2593页

作者：张小锋周克崧董淑娟徐伟宋进兵刘敏 .华南理工大学材料科学与工程学院广州510640 广州有色金属研究院新材料研究所广州510650 IRTES-LERMPS Laboratory Université de Technologie de Belfort-Montbéliard

A columnar Al film was firstly deposited on the top of 7%Y2O3？stabilized zirconia （7YSZ） ceramic coating in thermal barrier coating （TBC） system by magnetron sputtering. A vacuum treatment was then carried out at 700 °C for 1 h and 900 °C for 5 h to improve the erosion resistance of Al-deposited TBC. Aα-Al2O3 layer was in situ synthesized on the top of 7YSZ coating via vacuum heat treatment. The microstructure evolution of Al-deposited TBC illustrated that a loose surface-layer and a dense sub-layer formed on the top of 7YSZ coating after vacuum treatment. The phase structures of the as-sprayed TBC and the Al-deposited TBC after vacuum heat treatment were characterized by X-ray diffraction （XRD） and transmission electron microscope （TEM） assisted with focused ion beam （FIB）. Particulate erosion resistances of the as-sprayed TBC and treated TBC were compared at room temperature. In addition, erosion mechanism and schematic diagram were proposed. The results show that the Al-deposited TBC after vacuum heat treatment has better particulate erosion resistance than the as-sprayed one.

关键词： thermal barrier coating erosion resistance in situ synthesis

原位表面改性的纳米WC/AlSi10Mg合金增强机制

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Transactions of Nonferrous Metals Society of China 2024年第1期34卷 50-64页

作者：易江龙廖汉林常成闫星辰刘敏周克崧广东工业大学材料与能源学院广州510006 广东省科学院新材料研究所现代材料表面工程技术国家工程实验室广东省现代表面工程技术重点实验室广州510651 ICB UMR 6303 CNRSUniv.Bourgogne Franche-ComtéUTBM90010BelfortFrance

采用静电自组装工艺合成-系列不同纳米WC含量的表面改性Al Si10Mg粉末,并使用激光选区熔化(SLM)技术制备纳米WC/AlSi10Mg复合材料。结果表明,SLM制备的纳米WC/AlSi10Mg材料中形成多种Al-W金属间化合物相,通过(002)(α(Al))//(104)Al_(5)... 详细信息

采用静电自组装工艺合成-系列不同纳米WC含量的表面改性Al Si10Mg粉末,并使用激光选区熔化(SLM)技术制备纳米WC/AlSi10Mg复合材料。结果表明,SLM制备的纳米WC/AlSi10Mg材料中形成多种Al-W金属间化合物相,通过(002)(α(Al))//(104)Al_(5)W的取向关系,证实具有4.7%的低晶格失配度的Al/Al5W可形成良好共格界面。纳米WC颗粒和Al-W相可促使柱状晶转变为等轴晶,获得精细的等轴晶组织。同时,SLM制备的3%(质量分数)纳米WC/Al Si10Mg复合材料具有最优的力学性能,抗拉强度为(464.1±8.68) MPa,伸长率为(5.6±0.95)%。此外,与其他WC/AlSi10Mg复合材料相比,SLM制备的3%WC/AlSi10Mg样品的平均摩擦因数和磨损率最低,分别为0.429和3.842×10^(-5)mm^(3)/(N·m)。力学和磨损性能的提升主要归因于晶粒细化和第二相析出强化作用。

关键词：原位改性激光选区熔化纳米WC AlSi10Mg 力学性能

Extramedullary plasmacytoma with the uvula as first affected site:A case report

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World Journal of Clinical Oncology 2025年第1期16卷 53-58页

作者： Jing Yang Hui Peng Sheng-ke Tu Min Li Kui song Department of Hematology The First Affiliated Hospital of Jishou UniversityJishou 416000Hunan ProvinceChina Department of Pharmacy The First Affiliated Hospital of Jishou UniversityJishou 416000Hunan ProvinceChina

BACKGROUND Extramedullary plasmacytoma(EMP)represents one of the rarer forms of plasma cell malignancies,capable of impacting a variety of tissues and organs throughout the *** majority of EMP cases are predominantly found in the head and neck region,especially within the laryngopharynx,as well as in the gastrointestinal *** there have been documented instances of oropharyngeal involvement in EMP cases in the academic literature,it is important to note that EMP specifically affecting the uvula is exceedingly ***,it is noteworthy that over 60% of epithelial carcinomas in the upper respiratory tract and oropharynx tend to metastasize to the cervical lymph nodes,indicating a propensity for regional spread in these types of *** this context,we present a rare case of extramedullary plasmacytoma where the uvula served as the initially affected *** case emphasizes the need for heightened awareness among clinicians regarding such unusual comorbidities,as early recognition and diagnosis can significantly influence patient management and treatment *** addition,a review of the relevant literature is included to further educate and inform healthcare professionals about this rare presentation,ultimately aiming to enhance clinical understanding and improve patient care in similar *** SUMMARY A 51-year-old man was admitted to our hospital because of a slowly enlarging neck mass.A physical examination revealed a palpable left lymph node,and magnetic resonance imaging(MRI)of the oropharynx and the neck showed a soft tissue mass in the oropharynx and enlargement of multiple lymph nodes in the *** soft tissue mass was diagnosed as plasmacytoma by immunohistochemical *** immunoglobulins and bone marrow biopsy showed normal ***,we diagnosed that as EMP of the *** four cycles of adjuvant chemotherapy dominated by bortezomib,MRI reexamination showed a significant reduction of the mass

关键词： Extramedullary plasmacytoma Plasmacytoma Uvula Multiple myeloma Case report

Study on the hydrogen absorption properties of a YGdTbDyHo rare-earth high-entropy alloy

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International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 127-135页

作者： Tongyue Li Ziliang Xie Wenjiao zhou Huan Tong Dawen Yang Anjia Zhang Yuan Wu Xiping song State key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China Whole Win(Beijing)Materials Sci.&Tech.Co. Ltd.Beijing 100083China

This study investigated the microstructure and hydrogen absorption properties of a rare-earth high-entropy alloy(HEA),*** indicated that the YGdTbDyHo alloy had a microstructure of equiaxed grains,with the alloy elements distributed *** hydrogen absorption,the phase structure of the HEA changed from a solid solution with an hexagonal-close-packed(HCP)structure to a high-entropy hydride with an faced-centered-cubic(FCC)structure without any secondary phase *** alloy demonstrated a maximum hydrogen storage capacity of 2.33 H/M(hydrogen atom/metal atom)at 723 K,with an enthalpy change(ΔH)of-141.09 kJ·mol^(-1)and an entropy change(ΔS)of-119.14 J·mol^(-1)·K^(-1).The kinetic mechanism of hydrogen absorption was hydride nucleation and growth,with an apparent activation energy(E_(a))of 20.90 kJ·mol^(-1).Without any activation,the YGdTbDyHo alloy could absorb hydrogen quickly(180 s at 923 K)with nearly no incubation period *** reason for the obtained value of 2.33 H/M was that the hydrogen atoms occupied both tetrahedral and octahedral *** results demonstrate the potential application of HEAs as a high-capacity hydrogen storage material with a large H/M ratio,which can be used in the deuterium storage field.

关键词： rare-earth high-entropy alloy hydrogen absorption capacity pressure–composition–temperature curves kinetics