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Microstructure and performance of WC-Co-Cr coating with ultrafine/nanocrystalline structures

Rare Metals 2018年第11期37卷 968-975页

作者： Xue-Zheng Wang Hai-Bin Wang Xue-Mei Liu Chao Hou Xiao-Yan Song College of Materials Science and Engineering Key Laboratory of Advanced Functional Materials Education Ministry of ChinaBeijing University of Technology

The WC-lOCo-4Cr composite powder was synthesized firstly. Then the composite powder was agglomerated to prepare thermal spraying feedstock. The ultrafine/nanostructured WC-lOCo-4Cr coating was prepared by high velocity oxygen fuel thermal spraying. The phase constitution, elemental distribution and microstructure of the coating were characterized by X-ray diffraction and transmission electron microscopy, respectively. The wear resistance and corrosion resistance of the prepared composite coating were tested. The results show that the main phases of the coating include WC, binding phase with partial amorphous structure, with a little WC and Co(Cr)coexisting. The distributions of Co and Cr elements from the phase boundary to the eutectic area then to Co zone were analyzed quantitatively. The mechanisms for the formation of the microstructure and effects of Cr on the performance of the composite coating are proposed.

关键词： In situ synthesis high velocity oxygen fuel Ultrafine/nanostructure Composite coating Phase constitution

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Effect of vacuum heat treatment on microstructure and corrosion behavior of HVOF sprayed AICoCrFeNiCu high entropy alloy

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Journal of Iron and Steel Research International 2023年第8期30卷 1550-1561页

作者： Yong-kuan Zhou l Jia-jie Kang Guo Jin Xiu-fang Cui Jie Zhang Guo-zheng Ma Zhi-qiang Fu Li-na Zhu Ding-shun She Yu-yun Yang School of Engineering and Technology China University of Geosciences(Beijing)Beijing 100083China School of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212100JiangsuChina Zhengzhou Institute China University of Geosciences(Beijing)Zhengzhou 451283HenanChina College of Material Science and Chemical Engineering Harbin Engineering UniversityHarbin 150001HeilongjiangChina Department of Mechanical Engineering Imperial College LondonLondon SW72AZUK National Key Lab for Remanufacturing Academy of Armored Forces EngineeringBeijing 100072China

To improve the corrosion resistance of coalbed methane drilling equipment,an AICoCrFeNiCu high entropy alloy coating was prepared on the AISI 4135(35CrMo)steel substrate by high velocity oxygen fuel(HVOF)technology,and the coating was subjected to vacuum heat treatment(VHT)at different temperatures(500,700,900 and 1100℃).The corrosion test of the substrate and the coatings after VHT in coalbed methane drilling fluid was carried *** results show that the HVOF sprayed AICoCrFeNiCu high entropy alloy(HEA)coating has a good bonding with the substrate,and the porosity of the coating is about 2.4%.There is partial segregation in the coating,and the coating mainly consists of body-centered cubic *** coating has good thermal stability,and the phase structure and microstructure of the coatings have changed after VHT at different *** with the substrate,the as-sprayed coating has better uniform corrosion resistance,and the corrosion resistance of the coating after VHT is further *** VHT at 500℃,the HVOF-sprayed AICoCrFeNiCu HEA coating has the best corrosion resistance.

关键词： high velocity oxygen fuel AICoCrFeNiCu high entropy alloy coating Vacuum heat treatment Microstructure Corrosion

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Failure Behavior of Thermal Barrier Coatings on Cylindrical Superalloy Tube Under Thermomechanical Fatigue

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Acta Metallurgica Sinica(English Letters) 2013年第4期26卷 404-408页

作者： Zhubing CHEN Zhongguang WANG Shijie ZHU Shenyang Aeroengine Research Institute Aviation Industry Corporation of China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of Sciences Department of Intelligent Mechanical Engineering Fukuoka Institute of Technology

Failure behavior of thermal barrier coatings on cylindrical superalloy tube was investigated under thermome- chanical fatigue （TMF）. Two types of TMF tests, i.e. in phase （IP） and out of phase （OP）, were performed in the temperature range of 450-850℃. All tests were carried out under mechanical strain control at a given period of 300 s. The bond coat NiCrAIY was produced by high velocity oxygen fuel （HVOF）, and the top coat 7%Y203-ZrO2 was deposited by air plasma spraying （APS）. The testing results showed that the OP TMF life was longer than the IP TMF one under the same mechanical strain amplitude. Observations of the fractured specimens revealed that the interface damage and cracking behavior in the two phasing conditions were different. In OP loading, the top coat was cracked and detached from the bond coat while no spallation was found in the IP loading.

关键词： Thermal barrier coating Air plasma spraying high velocity oxygen fuel Thermomechanical fatigue

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Effect of thermal cycle on Ni-Cr based nanostructured thermal spray coating in boiler tubes

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Transactions of Nonferrous Metals Society of China 2015年第5期25卷 1533-1542页

作者： V.SENTHILKUMAR B.THIYAGARAJAN M.DURAISELVAM K.KARTHICK Department of Production Engineering National Institute of Technology Bharat Heavy Electricals Limited

Ni-Cr based nanostructured feedstock powder was prepared by mechanical milling technique involving repeated welding, fracturing, and re-welding of powder particles in a planetary ball mill. The milled nanocrystalline powders were used to coat carbon steel tubes using high velocity oxygen fuel（HVOF） thermal spraying process. The characterization of the feedstock powder and HVOF coated substrates was performed using optical microscope, X-ray diffractometer（XRD）, scanning electron microscope（SEM）, high resolution transmission electron microscope（HR-TEM）, energy dispersive spectrometer（EDS） and microhardness tests. The coated and uncoated samples were subjected to different thermal cycles and characterized for their phase changes, metallurgical changes and microhardness variations. Ni-Cr nanostructured coated samples exhibited higher mechanical and metallurgical properties compared to their conventionally coated counter parts. The results showed that the nanostructured coating possessed a more uniform and denser microstructure than the conventional coating.

关键词： nanostructure coating feedstock powder thermal spray boiler tubes high velocity oxygen fuel

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