不同基体超音速火焰喷涂Cr<sub>3</sub>C<sub>2</sub>-20NiCr涂层的性能

doi:10.11896/cldb.19060210

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Abstract The Cr₃C₂-20NiCr coatings were prepared on 38CrMoAl and 316L substrate by high velocity oxygen fuel (HVOF) spraying. The microstructure and phase of the coatings were analyzed by scanning electron microscopy (SEM), X-ray diffraction (XRD) and Raman spectrometer, and the bonding strength, mechanical impact resistance, thermal shock resistance, wear resistance and high temperature microhardness of the Cr₃C₂-20NiCr coatings were tested. The results showed that Cr₃C₂-20NiCr coatings deposited on both 38CrMoAl and 316L substrate by HVOF exhibited good bonding strength (more than 70 MPa), and the tensile fracture mechanisms of the coatings were mainly characterized by brittle fracture and localized ductile fracture. The mechanical impact failure forms were mainly two ways of interlayer cracking and detachment of hard particles from bond phase inside the coatings. The hardness of 316L substrate was higher than that of 38CrMoAl substrate, and the impact of powder particles on 316L substrate made them fully deformed, resulting in a relatively low porosity (3.83%). Therefore, the thermal shock resis-tance, oxidation resistance and wear resistance of the coatings deposited on 316L substrate were better than that of the coatings deposited on 38CrMoAl substrate. Abrasive wear mainly occurred in the two coatings at room temperature, while hardness of the coatings decreased at 600 ℃ and the main wear mechanisms were oxidation wear and delamination wear, accompanied by slight abrasive wear.

Key words： Cr₃C₂-20NiCr coatings high velocity oxygen fuel (HVOF) mechanical impact thermal shock high temperature microhardness

Published: 29 May 2020

CLC number:

TG174. 4

Fund:This work was financially supported by the National Natural Science Foundation of China (51674130), the International Science and Technology Cooperation Program of China (2016YFE0111400), the International Science and Technology Correspondent Program of Gansu Province (17JR7WA017), and the Key Research and Development Project in Gansu (17YF1WA159).

About author:: Pengjun Tang received his B. E. degree in June 2013 from Shanghai University of Science and Technology. Now studying at Lanzhou University of Technology, a graduate student of Material Science and Engineering College, mainly engaged in the research of high tempe-rature wear-corrosion resistance coatings.

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	TANG Pengjun
	LI Xuqiang
	ZHAI Haimin
	LI Wensheng

Cite this article:

TANG Pengjun,LI Xuqiang,ZHAI Haimin, et al. High Velocity Oxygen Fuel (HVOF)[J]. Materials Reports, 2020, 34(12): 12115-12121.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.19060210 OR http://www.mater-rep.com/EN/Y2020/V34/I12/12115

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