Microstructure of Laser In-Situ Synthesized ZrB2-C Reinforced Cu Matrix Composite Coatings

被引：0

作者：

Lü X. ^{[1
]}

Zhan Z. ^{[1
]}

Cao H. ^{[1
]}

机构：

[1] State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao

来源：

Xiyou Jinshu/Chinese Journal of Rare Metals | 2020年 / 44卷 / 01期

关键词：

Composite coating; In-situ synthesis; Laser cladding; Spherical graphite; ZrB[!sub]2[!/sub;

D O I：

10.13373/j.cnki.cjrm.XY18080012

中图分类号：

学科分类号：

摘要：

Al-ZrO2-B4C-Ni-Cu powder was used as the cladding powder. ZrB2 and graphite C reinforced Cu matrix composite coatings were fabricated on the surface of copper by laser cladding combined with in-situ synthesis reaction. The microstructure of the composite coatings, phase compositions, the structure of the in-situ synthesized phase were investigated by means of optical microscopy (OM), X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and energy dispersive spectroscopy (EDS) etc.; The microhardness of the composite coatings was measured by a Vickers hardness tester. And the growth process of the composite coating microstructure was analyzed. The results showed: aneedle-like ZrB2 ceramic phase and spherical graphite (with the Al2O3 core) were in-situ synthesized in the composite coating. Due to the rapid cooling in the melt, the dendritic crystal was formed by non-equilibrium solidification, and the ZrB2 ceramic phase was wrapped by the dendritic crystal. The ZrB2 ceramic, a fiber reinforced phase, hada superior bonding with the metal matrix that could improve the mechanical properties of composite coating effectively. The position near the surface of the composite coating had the highest microhardness, the microhardness inside the coating slowly decreased along the direction of depth, and rapidly dropped to the hardness value of the Cu matrix after through the interface. The mean microhardness of the composite coating reached 4800 MPa, which was about 7 times higher than that of the copper substrate. © Editorial Office of Chinese Journal of Rare Metals. All right reserved.

引用

页码：34 / 40

页数：6

共 19 条

[11] Yan H., Zhang P.L., Yu Z.S., Li C.G., Li R.D., Development and characterization of laser surface cladding (Ti, W)C reinforced Ni-30Cu alloy composite coating on copper, Optics & Laser Technology, 44, 5, (2012)
[12] Shu D., Li Z., Zhang K., Yao C.W., Li D.Y., Dai Z.B., In situ synthesized high volume fraction WC reinforced Ni-based coating by laser cladding, Materials Letters, 195, (2017)
[13] Liu J., Yu H., Chen C., Weng F., Dai J., Research and development status of laser cladding on magnesium alloys: a review, Optics and Lasers in Engineering, 93, (2017)
[14] Zuhailawati H., Yong T.L., Consolidation of dispersion strengthened copper-niobium carbide composite prepared by in situ and ex situ methods, Materials Science and Engineering: A, 505, 1-2, (2009)
[15] Pu Y.P., Guo B.G., Zhou J.S., Zhang S.T., Zhou H.D., Chen J.M., Microstructure and tribological properties of in situ synthesized TiC, TiN, and SiC reinforced Ti3Al intermetallic matrix composite coatings on pure Ti by laser cladding, Applied Surface Science, 255, 5, (2008)
[16] Masanta M., Shariff S.M., Roy Choudhury A., Microstructure and properties of TiB2-TiC-Al2O3 coating prepared by laser assisted SHS and subsequent cladding with micro-/nano-TiO2 as precursor constituent, Materials & Design, 90, (2016)
[17] Liu F., Liu C.S., Chen S.Y., Tao X.Q., Zhang Y., Laser cladding Ni-Co duplex coating on copper substrate, Optics and Lasers in Engineering, 48, 7-8, (2010)
[18] Peter R., Ternary metal boron carbides, International Journal of Refractory Metals & Hard Materials, 17, (1999)
[19] Meyers M., Chawla K., Mechanical Behavior of Materials (Second Edition), 765, (2009)

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