Lanzhou Petroleum Machinery Institute

Lanzhou, China

Lanzhou Petroleum Machinery Institute

Lanzhou, China

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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.


Yang G.-R.,Lanzhou University of Technology | Song W.-M.,Lanzhou University of Technology | Song W.-M.,Lanzhou Petroleum Machinery Institute | Li J.,Wuhan Research Institute of Materials Protection | And 3 more authors.
International Journal of Materials Research | Year: 2016

Ni/WC surface-infiltrated composite coating was fabricated on copper alloy substrate through vacuum infiltration casting using Ni-based alloying powder and with different WC particle contents as raw materials. The wear behavior of Ni/WC surface-infiltrated composite coating was investigated using a block-on-ring tester at different loads and sliding speeds at room temperature. Results show that the wear rate of Ni/WC surface-infiltrated composite coating decreased to approximately one-sixth of the wear rate of the Ni-based alloy infiltrated coating. This phenomenon resulted from the supporting function of WC particles under varying loads applied on the specimen surface and the antifriction effect of the transformation layer. Wear rate was reduced by the Ni/WC-infiltrated composite coating with increasing load, especially when the load exceeded 100 N. The friction coefficient decreased with increasing sliding speed for all infiltrated coatings at any load condition. The reduction in the friction coefficient at high sliding speed was larger than that at low sliding speed with increasing load. The wear mechanism was dominated by oxidation under all experimental conditions and accompanied by adhesion and abrasion mechanisms at high load and high sliding speed. © Carl Hanser Verlag GmbH & Co. KG.


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.


Yang G.,Lanzhou University of Technology | Song W.,Lanzhou Petroleum Machinery Institute | Ma Y.,Lanzhou University of Technology | Lu J.,CAS Lanzhou Institute of Chemical Physics | And 3 more authors.
Journal Wuhan University of Technology, Materials Science Edition | Year: 2011

The surface infiltrated composite (Ni/WC) layers on gray iron substrate were fabricated through a vacuum infiltration casting technique (VICT) using Ni-based composite powder with different WC particles content as raw materials. The microstructures of surface infiltrated composite layer, the interface structures between surface composite layer and the substrate, the changes of macro-hardness with the increasing of WC content and the micro-hardness distribution are investigated. The infiltrated composite layer includes a surface composite layer and a transition layer, and the thickness of the transition layer decreases with the increasing content of WC. The thickness of transition layer with 20%WC content in the surface infiltrated composite layer was 170 μm which was the thickest for all transition layers with different WC content. The surface composite layer was mainly composed of WC, W2C, FeB and NiB, along with Ni-Cr-Fe, Ni (Cr) solid solution, Ni (Si) solid solution and Ni (Fe) solid solution. The transition layer was composed of Ni (Cr) solid solution, Ni (Fe) solid solution, Ni (Si) solid solution, Fe (Ni) solid solution and eutectic. The surface macro-hardness and micro-hardness of the infiltrated layer had been evaluated. The macro-hardness of the surface composite layer decreases with the WC content increasing, and the average macro-hardness is HRC60. The distribution of micro-hardness presents gradient change. The average micro-hardness of the infiltrated layer is about HV1000. © 2011 Wuhan University of Technology and Springer-Verlag Berlin Heidelberg.


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.


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.


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

Ni/WC surface infiltrated composite layer was fabricated on gray iron substrate through vacuum infiltration casting technique using Ni-based powder and WC particles with different content as raw materials. The compact infiltrated composite layer was obtained on the condition of appropriate choice of processing condition such as pouring temperature, preheating temperature, thickness of preform and the grain size of powder. The infiltrated layer includes surface composite layer and transition layer, and the thickness of transition layer decreases with the increasing content of WC. Three-point bending tests were performed to investigate the mechanical and metallurgical properties of the surface infiltrated composite layer. It was found that load-holding circumstance appeared for specimen with infiltrated layer during the process of three-point bending, and there was no this circumstance for substrate during bending process. The load and displacement decreased with the increasing content of WC when the load-holding circumstance happened. The fracture extended to the substrate for all specimens with surface infiltrated composite layer, and the fracture form was similar for all specimens with different WC content. The WC particles were the source of micro-crack for surface infiltrated layer, and the graphite was the source of micro-crack for gray iron substrate. © (2011) Trans Tech Publications.


Sun X.-M.,Wuhan Research Institute of Materials Protection | Sun X.-M.,Wuhan Institute of Technology | Li J.,Wuhan Research Institute of Materials Protection | Yang G.-R.,Lanzhou University of Technology | And 2 more authors.
Advanced Materials Research | Year: 2011

The Ni/ZrO2 composite powder was used as raw materials to fabricate the surface infiltrated composite layer on cast steel substrate through vacuum infiltrated casting technology. The microstructure indicated that the infiltrated composite layer included surface composite layer, Ni-based alloying layer and diffusion transition layer. The thickness of diffusion transition layer deceased with the increasing thickness of preform. The surface infiltrated composite layer was composed of ZrO2 ceramic particles, Cr2B and NiB intermetalic compounds as well as Ni-based solid solution. The Ni-based solid solution and Fe-based solid solution was the main composition for diffusion transition layer. The change of micro-hardness of surface infiltrated composite layer presents gradient from surface of infiltrated layer to substrate. © (2011) Trans Tech Publications, Switzerland.


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.


Sun X.,Wuhan Research Institute of Materials Protection | Sun X.,Wuhan Institute of Technology | Yang G.,Lanzhou University of Technology | Song W.,Lanzhou Petroleum Machinery Institute | And 3 more authors.
Journal Wuhan University of Technology, Materials Science Edition | Year: 2012

The Ni/ZrO 2 was used as raw materials to fabricate the surface infiltrated composite layer with 1-4 mm thickness on cast steel substrate through vacuum infiltrated casting technology. The microstructure indicated that the infiltrated composite layer included surface composite layer and transition layer. Wear property was investigated under room temperature and 450 °C. The results indicated that the abrasion volume of substrate was 8 times that of the infiltrated composite layer at room temperature. The friction coefficient of infiltrated composite layer decreased with the increasing load. The wear resistance of infiltrated composite layer with different ZrO 2 contents had been improved obviously under high temperature. The friction coefficient of infiltrated composite layer was decreased comparing with that at room temperature. The oxidation, abrasive and fatigue abrasion was the main wear mechanism at room temperature. Oxidation abrasion, fatigue wear and adhesive wear dominated the wearing process under elevated temperature. ©Wuhan University of Technology and SpringerVerlag Berlin Heidelberg 2012.

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