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2021 Vol. 64, No. 13 Published: 2021-07-01

FEATURE FORUM RESEARCH C0NTENTS COVER STORY APPROACHING SCIENCE

FEATURE

	14	Research Progress on Bond Coat of Environmental Barrier Coatings
		ZHOU Yichun,WANG Mingming,WU Rudder,YANG Li
		DOI: 10.16080/j.issn1671-833x.2021.13.014
		SiC ceramic matrix composite （SiC/SiC) has excellent high-temperature mechanical properties and thermal stability, and has shown great application potential in hot-end parts of aeroengine. However, SiC ceramic matrix composite would encounter the corrosion in the water vapor environment, therefore, environmental barrier coatings (EBCs） is essential. The bond coat which can enhance the adhesion between the EBCs and the substrate, and reduce the thermal expansion mismatch between the substrate and the coating, plays an important role. This paper reviews the EBCs bond coat, including the Si bond coat and the composite bond coat, and finally prospects the development direction of the EBCs bond coat.
		2021 Vol. 64 (13): 14-25 [Abstract] ( 154 ) HTML^New PDF (122409 KB) ( 383 )

COVER STORY

	26	Assembly Operation Process Assistance Based on Augmented Reality and Artificial Intelligence
		WU Dianliang，ZHOU Shuo，XU Hanzhong
		DOI: 10.16080/j.issn1671-833x.2021.13.026
		In this paper, augmented reality (AR) is combined with 3D digital technology and artificial intelligence (AI) to realize the operation guidance, information perception and error prevention of assembly site. Firstly, based on the characteristics of manual assembly, the composition architecture and application mode of the AR intelligent assembly assistance system are proposed, and then 3D digital assembly process modeling, on-site AR registration/tracking/ fusion display, and AR real-time images are used to extract assembly feature information through AI image processing algorithms. The AR auxiliary assembly prototype system was developed based on the system composition framework and key technologies, and the application verification was carried out with the aeroengine assembly as the object. The results show that AR aided assembly can solve the problems of operation prompt, target recognition, operation guidance and error prevention in manual assembly of complex products.
		2021 Vol. 64 (13): 26-32 [Abstract] ( 242 ) HTML^New PDF (130148 KB) ( 309 )

FORUM

	36	Research Progress on Typical Preparation Technology of Thermal Barrier Coatings
		ZHANG Baopeng, ZHU Shen, WANG Yu, LIU Wei, LI Ce
		DOI: 10.16080/j.issn1671-833x.2021.13.036
		The development status of thermal barrier coating materials, structures and preparation technologies is reviewed. The preparation methods of plasma spraying (PS), electron beam-physical vapor deposition (EB-PVD) and plasma spray-physical vapor deposition (PS-PVD) are discussed. The advantages and disadvantages of different processes are compared. PS-PVD has high deposition efficiency, long thermal cycling life of coatings, and can realize non-line of sight deposition. Thus, PS-PVD has good development and application prospects. Finally, the development trends of thermal barrier coating materials, preparation technology and performance evaluation are prospected.
		2021 Vol. 64 (13): 36-44 [Abstract] ( 104 ) HTML^New PDF (41533 KB) ( 333 )

	45	Research Progress on Marine Adaptability of Ceramic Based Materials for Thermal Barrier Coating of Marine Gas Turbine
		CHEN Zhuo, JIN Guo, CUI Xiufang, FANG Yongchao, YAN Chao, WANG Xiang
		DOI: 10.16080/j.issn1671-833x.2021.13.045
		With the rapid development of marine gas turbines, the serve conditions of components in hottest parts are increasingly harsh. However, the existing thermal barrier coatings have actually fallen into the bottleneck of improving the multi-medium thermal corrosion resistance and high-temperature thermo-mechanical coupling stability, which can not fully meet the more stringent protection requirements of the heated end components for the new generation marine gas turbines. In this paper, the research status on the environmental suitability improvement of ceramic-based materials used in thermal barrier coatings under the marine atmospheric environment is summarized. The service condition characteristics of thermal barrier coatings in marine gas turbine are analyzed. In addition, the studies on the yttrium oxide partially stabilized zirconia (YSZ) materials strengthened by rare earth ion doping modification and fiber toughening, as well as various novel ceramicbased materials for thermal barrier coatings in improving thermal cycle life and corrosion resistance are summarized. Finally, the development trend of ceramic-based materials for thermal barrier coatings of marine gas turbines in the future is predicted.
		2021 Vol. 64 (13): 45-58 [Abstract] ( 113 ) HTML^New PDF (75699 KB) ( 108 )

	59	Research on Status of Thermal Properties of Thermal Barrier Coatings
		JIN Shenghao, WANG Boxiang, ZHAO Changying
		DOI: 10.16080/j.issn1671-833x.2021.13.059
		Thermal barrier coatings (TBCs) is a ceramic material used for thermal insulation of hot end parts of aeroengine. The thermal properties of this material will directly affect its thermal insulation performance. A review of the experimental and theoretical research on heat conduction and thermal radiation characteristics inside TBCs in recent years is presented. The macro-to-micro heat conduction theory and thermal radiation theory are introduced, and the cross-scale heat conduction and radiation processes in TBCs are analyzed. In theoretical aspect, the heat transfer theories under different scales and related theoretical research of TBCs are summarized in the order of macroscale to microscale. In experimental aspect, the research on heat transfer characteristic of TBCs with different materials and structures are summarized according to the development of TBCs materials. This review analyzes the research status of heat conduction and thermal radiation inside TBCs, and the future development direction of the research on heat transfer characteristics of TBCs is prospected.
		2021 Vol. 64 (13): 59-76/87 [Abstract] ( 125 ) HTML^New PDF (52605 KB) ( 139 )

	77	Research Progress on Gadolinium Zirconate Ceramics as Thermal Barrier Coatings
		FU Lang, MAO Jie,DENG Ziqian,DENG Chunming,LIU Min,ZENG Dechang
		DOI: 10.16080/j.issn1671-833x.2021.13.077
		With the development of aero-engine towards high efficiency and high thrust weight ratio, higher requirements are put forward for the thermal barrier coatings applied on the surface of engine hot end parts. For YSZ materials can not meet the requirements of higher temperature and better thermal insulation, the development and application of new thermal barrier coating materials are attracting more and more attention worldwide. Gadolinium zirconate is one of the most promising ceramic materials for thermal barrier coatings due to its low thermal conductivity, high phase transition temperature and high thermal expansion coefficient. Based on the published literature, the research progress on gadolinium zirconate thermal barrier coatings is summarized in detail. Firstly, the research status of thermal barrier coating materials and preparation technology is briefly introduced. Secondly, the properties of gadolinium zirconate materials and the properties of gadolinium zirconate thermal barrier coating prepared by different processes are expounded in detail. Finally, the existing problems of gadolinium zirconate materials and the application prospect of preparing gadolinium zirconate coating by plasma spray-physical vapor deposition (PS-PVD) are discussed.
		2021 Vol. 64 (13): 77-87 [Abstract] ( 123 ) HTML^New PDF (25644 KB) ( 66 )

APPROACHING SCIENCE

	88	Solidifying Foundation and Independent Innovation, Developing Non-Traditional Machining Technology to Boost Aviation Manufacturing


		2021 Vol. 64 (13): 88-89 [Abstract] ( 86 ) HTML^New PDF (509 KB) ( 100 )

RESEARCH

	90	Identification of Plastic Constitutive Parameters of 45 Steel Based on In-Situ Imaging of Cutting Process
		CHEN Xiaoqi,ZHANG Ke,NIE Guangchao,ZHANG Xiaoming
		DOI: 10.16080/j.issn1671-833x.2021.13.090
		The cutting process produces large stress, strain and strain rate, which are much higher than those in traditional mechanical tests, including Split-Hopkinson pressure bar test. Therefore, a new method is proposed to identify the constitutive parameters of metal materials. This method is based on high-resolution in-situ imaging and digital image correlation technique (DIC), combined with analytical algorithm optimization, the optimal parameters of materials constitutive model have been identified. It is especially suitable for identifying constitutive parameters in the case of large strain and strain rate. In-situ imaging technique is used to perform orthogonal turning experiments on 45 steel (AISI 1045), and the strain and strain rate fields in the primary shear zone (PSZ) are obtained using DIC technique. Then, the stress field is calculated based on the constitutive equation. Stress integrations in the PSZ shear plane are obtained and matched with the component of the cutting force measured by the dynamometer projected onto the shear plane, and the optimal constitutive parameter is identified by performing the optimization of the solution. Finally, the feasibility and effectiveness of the proposed method are verified by comparing the results of finite element simulation using the identified constitutive parameters with the experimental results.
		2021 Vol. 64 (13): 90-95 [Abstract] ( 104 ) HTML^New PDF (19301 KB) ( 74 )

	96	Effects of Shoulder Profile on Corner Joints Formation Welded by Stationary Shoulder Friction Stir Welding for High Strength Aluminum
		XIA Peiyun, YIN Yuhuan,DONG Jiyi,Lü Hongya,WANG Chunming,ZHAO Huihui,FENG Xiaosong
		DOI: 10.16080/j.issn1671-833x.2021.13.096
		Two kinds of stationary shoulder were designed to analyze corner joints formation and material flow characteristics, using 7A52 and 7B52 dissimilar materials, and then the effects of process parameters (rotation speed, welding speed and plunge depth) on weld formation were also analyzed. The results show that an instantaneous cavity at the top is formed owing to material flowing downward in advancing side, and if the cavity cannot be filled by material in time, the top corner defects will occur. The round corner shoulder has advantages to promote material flowing from top corner to advancing side to fill the cavity. The joints with smooth surface and no defect were obtained even if the plunge depth is 0.05mm, when rotating speed at 1000 r/min and welding speed at 100-200mm/min. Top corner defects are easily produced in joints welded by sharp corner stationary shoulder friction stir welding (SSFSW), because there are not enough material to fill the cavity on the top of advancing side, even if the process parameters are changed.
		2021 Vol. 64 (13): 96-101 [Abstract] ( 98 ) HTML^New PDF (136626 KB) ( 201 )

Notices

·	'Aeronautical Manufacturing technology ' is included in EI database

·	China Science Citation Database (CSCD)

·	Chinese S&T Journal Citation Reports (CJCR)

·	World Journal Clout Index (WJCI) Report of Scientific and Technological Periodicals

·	Supported in China Science and Technology Journal Excellence Action Plan

·	Aeronautical Manufacturing Technology ranked No. 3 in Chinese S&T Journal Citation Reports (CJCR)

·	High Quality Sci-tech Journal Classification Catalogue in Aerospace Field （2023）

·	A Guide to the Core Journals of China (hosted by Peking University Library)

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