电弧熔覆ZrO<sub>2</sub>颗粒增韧对硅化钼涂层的组织及力学性能的影响

doi:10.11896/cldb.21040249

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Abstract MoSi₂ is a promising protective material for refractory metal coating, but room temperature brittleness limites its engineering application. In this work, the effects of the addition of ZrO₂ on the hardness, wear resistance and fracture toughness of MoSi₂ coating prepared by arc cladding technology were studied by using Sigma500 field emission scanning electron microscope, D8 advance X-ray diffraction, microhardness tester, Nanovea Tribometer friction and wear tester. And the toughening mechanism, as well as friction and wear mechanism of MoSi₂ coating after arc cladding were also analyzed. The results show that the microstructure of the coating prepared by arc cladding is mainly cellular dendrite. The pure MoSi₂ coating prepared by arc cladding is mainly composed of MoSi₂ and Mo₅Si₃, while the composite coating with ZrO₂ addition is mainly composed of MoSi₂, Mo₅Si₃, t-ZrO₂ and m-ZrO₂. The microhardness of the composite coating is increased by 16.9%, 20.8%, 17.45% and 51.4% after adding 5%ZrO₂, 10%ZrO₂, 20%ZrO₂ and 30%ZrO₂ (mass fraction, the same below), respectively. It is found that the MoSi₂ coating with 20%ZrO₂ has the highest fracture toughness that is about 6 times higher than that of pure MoSi₂ coating, which is attributed to dispersing the stress of the main crack and restraining the crack propagation by inducing crack deflection and microcrack. Moreover, the friction and wear experiments show that the composite coating with 20%ZrO₂ has the most stable wear loss and flat wear surface, suggesting its excellent wear resistance. The main friction and wear mechanism is oxidation wear and slight adhesive wear.

Key words： arc cladding molybdenum disilicide (MoSi₂) zirconia (ZrO₂) wear resistance fracture toughness

Published: 10 July 2022 Online: 2022-07-12

CLC number:

TG148

Fund:National Natural Science Foundation of China(51401093),the Major Natural Science Research Projects of Universities in Jiangsu Province (17KJA430006, 18KJA430007) and the Innovative Practice Program for Postgraduates of Jiangsu University of Technology(XSJCX20_33).

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	WANG Bin
	SUN Shunping
	WANG Hongjin
	LI Xiaoping
	LEI Weining

Cite this article:

WANG Bin,SUN Shunping,WANG Hongjin, et al. Effect of Particles Toughening for ZrO₂ on Microstructure and Mechanical Properties of Molybdenum Silicide Coating Prepared by Arc Cladding[J]. Materials Reports, 2022, 36(13): 21040249-6.

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http://www.mater-rep.com/EN/10.11896/cldb.21040249 OR http://www.mater-rep.com/EN/Y2022/V36/I13/21040249

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