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JI Zhaohui, WANG Hongyang, SUN Zhen, DING Kunying. Effect of interfacial bonding properties of WC-17Co/Ti-6Al-4V after roughening on the face of substrate[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2018, 39(5): 77-81. DOI: 10.12073/j.hjxb.2018390127
Citation: JI Zhaohui, WANG Hongyang, SUN Zhen, DING Kunying. Effect of interfacial bonding properties of WC-17Co/Ti-6Al-4V after roughening on the face of substrate[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2018, 39(5): 77-81. DOI: 10.12073/j.hjxb.2018390127

Effect of interfacial bonding properties of WC-17Co/Ti-6Al-4V after roughening on the face of substrate

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  • Received Date: November 24, 2016
  • The effect of surface roughness of Ti-6Al-4V alloy on the bonding strength of tungsten carbide (WC-17Co) coatings sprayed by high velocity oxygen fuel (HVOF) was studied. Different sand blasting processes were used to generate different surface roughness with 22.003, 20.845 and 14.765 μm for No.1, No.2 and No.3 specimens, respectively. The WC-17Co coating with a thickness of 0.3 mm was deposited on the surface of titanium alloy by HVOF technology. The three-point bending test was performed on the WC-17Co/Ti-6Al-4V sample, and the interface morphology was observed by a scanning electron microscope. It was found that cracks propagated seriously at the interface of No. 3 specimen, resulting in the coating peeling off. No. 2 sample showed the best bonding properties. The four-point bending method was used to test the fracture energy release rates between the coating and the substrate, and the values of release rate were 239.7, 259.0 and 200.1 J/m2for three specimens, respectively.
  • 中国表面工程协会热喷涂专业委员会. 中国热喷涂年鉴2003年版[M]. 北京: 科学技术文献出版社, 2004.[2] Amada S, Hirose T. Influence of grit blasting pre-treatment on the adhesion strength of plasma sprayed coatings: fractal analysis of roughness[J]. Surface and Coatings Technology, 1998, 102: 132-137.[3] Wang Y Y, Li C J, Ohmori A. Influence of substrate roughness on the bonding mechanisms of high velocity oxy-fuel sprayed coatings[J]. Thin Solid Films, 2005, 485: 141-147.[4] Staia M H, Ramos E, Carrasquero A,et al. Effect of substrate roughness induced by grit blasting uponadhesion of WC-17% Co thermal sprayedcoatings[J]. Thin Solid Films, 2000, 377: 657-664.[5] Yang Hui, Pan Shaoming. Effect of substrate roughness on bond strength of coatings[J]. Hot Working Technology, 2008, 37(15): 118-121.[6] Yang Hui, Pan Shaoming. Bonding mechanism of WC-12Co coatings prepared by supersonic plasma spraying on 45 steel[J]. Transactions of Materials and Heat Treatment, 2009, 30(3): 187-191.[7] Lia H, Khora K A, Cheangb P. Young’s modulus and fracture toughness determination of high velocity oxy-fuel-sprayed bioceramic coatings[J]. Urface and Coatings Technology, 2002, 155: 21-32.
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