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Yang G.-R.,Lanzhou University of Technology | Song W.-M.,Lanzhou Petroleum Machinery Institute | Sun X.-M.,Wuhan Institute of Technology | Ma Y.,Lanzhou University of Technology | And 4 more authors.
Advanced Materials Research | Year: 2010

The surface composite layer Ni/WC on the cast iron substrate was fabricated through vacuum infiltration casting technique using Ni-based powder and WC particles with different content as raw materials. The micro-structure of infiltrated layer was compact for all infiltrated layer with different WC content, and WC particles distributed uniformly. The surface infiltrated layer was mainly composed of WC particle, intermetallic compound and solid solution. The thermal cycles were beyond 108 times when the infiltrated layer peeled off, which indicated that the specimen with infiltrated layer offered excellent thermal fatigue property. The oxidation rate of substrate was nearly three times as large as that of the infiltrated layer with 20% WC content. The oxidation resistance of the infiltrated layer improved obviously comparing with the substrate because the oxide layer for infiltrated layer was compact. © (2010) Trans Tech Publications. Source


Yang G.-R.,Lanzhou University of Technology | Song W.-M.,Lanzhou Petroleum Machinery Institute | Sun X.-M.,Wuhan Institute of Technology | Ma Y.,Lanzhou University of Technology | Hao Y.,Lanzhou University of Technology
Advanced Materials Research | Year: 2011

The Ni-P/SiC composite coating was prepared by chemical deposition technique. The corrosion behavior of electroless Ni-P/SiC composite coating was investigated. The results show that the corrosion resistance of electroless composite coating decreased with the increasing SiC concentration in bath solution. There were some little pores among the composite coating and the pores would increased with the increasing SiC content among the coating, which made the corrosion resistance decreased. The corrosion rate increased with the increasing temperature of corrosion liquid. The corrosion resistance was improved for T gradient electroless Ni-P/SiC composite coating comparing with the single electroless composite coating whether the corrosion solution was acid solution or alkaline solution. The corrosion rate were less than 5 mg/cm 2 for all specimens in alkaline solution, which indicated that the corrosion resistance of electroless composite coating was better than that in acid solution. © (2011) Trans Tech Publications, Switzerland. Source


Yang G.R.,Lanzhou University of Technology | Song W.M.,Lanzhou Petroleum Machinery Institute | Sun X.M.,Wuhan Institute of Technology | Ma Y.,Lanzhou University of Technology | And 2 more authors.
Advanced Materials Research | Year: 2011

The Ni-P/SiC composite coating was prepared by chemical deposition technique. The micro-structure and wear behavior of electroless Ni-P/SiC composite coating was investigated. The results show that the composite coating was dense and no any defects at the interface between substrate and electroless composite coating. Its thickness could reach 40 μm. Wear resistance was increased with the increasing content of SiC particles for single composite coating when the SiC concentration was less than 6g/L, then decreased with the increased SiC concentration. The wear resistance of gradient composite coating was improved above 16% comparing with the single composite coating. The wear resistance of T1 gradient coating was best for all electroless Ni-P/SiC composite coatings because the bonding strength was improved owing to the gradient change of SiC content. © (2011) Trans Tech Publications. Source


Yang G.-R.,Lanzhou University of Technology | Huang C.-P.,Lanzhou University of Technology | Song W.-M.,Lanzhou University of Technology | Song W.-M.,Lanzhou Petroleum Machinery Institute | And 4 more authors.
International Journal of Minerals, Metallurgy and Materials | Year: 2016

A multilayer tungsten carbide particle (WCp)-reinforced Ni-based alloy coating was fabricated on a steel substrate using vacuum cladding technology. The morphology, microstructure, and formation mechanism of the coating were studied and discussed in different zones. The microstructure morphology and phase composition were investigated by scanning electron microscopy, optical microscopy, X-ray diffraction, and energy-dispersive X-ray spectroscopy. In the results, the coating presents a dense and homogeneous microstructure with few pores and is free from cracks. The whole coating shows a multilayer structure, including composite, transition, fusion, and diffusion-affected layers. Metallurgical bonding was achieved between the coating and substrate because of the formation of the fusion and diffusion-affected layers. The Ni-based alloy is mainly composed of γ-Ni solid solution with finely dispersed Cr7C3/Cr23C6, CrB, and Ni+Ni3Si. WC particles in the composite layer distribute evenly in areas among initial Ni-based alloying particles, forming a special three-dimensional reticular microstructure. The macrohardness of the coating is HRC 55, which is remarkably improved compared to that of the substrate. The microhardness increases gradually from the substrate to the composite zone, whereas the microhardness remains almost unchanged in the transition and composite zones. © 2016, University of Science and Technology Beijing and Springer-Verlag Berlin Heidelberg. Source


Zhang Y.,Lanzhou University of Technology | Zhang Y.,Lanzhou Petroleum Machinery Institute | Yang G.,Lanzhou University of Technology | Huang C.,Lanzhou University of Technology | And 5 more authors.
Cailiao Yanjiu Xuebao/Chinese Journal of Materials Research | Year: 2015

A nickel-based (Ni0) composite coating, which was reinforced with 20%WC and 6% graphite particles and has a texture-like section morphology, was fabricated on steel substrate by vacuum cladding technology. Then its microstructure and tribological property under dry friction condition were characterized in comparison with other three coatings (Ni0, Ni0+20%WC and Ni0+6% graphite). The results show that the WC particles evenly distributed in the nickel-based (Ni0) alloy coatings and formed a special 3D reticular microstructure. The Ni-based alloy coating is mainly composed of γ-Ni solid solution, hard phases (Cr7C3, Cr23C6, CrB) and eutectic phases (Ni3Si, Ni3B). The cladd composite coating consisted of Ni0 with WC and graphite particles exhibits the highest wear resistance among the test coatings. The combination of texture-like structure (which was composed of WC particles and nickel base alloy) and graphite lubricant promoted the abrasion resistance of the composite coating by about 9.6 times in comparison to the pure Ni0 coating. © All right reserved. Source

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