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Wang J.,Sichuan Colleges and Universities | Fu S.,Chengdu Electromechanical College | Jiang B.,Chengdu Electromechanical College | Wang Y.,Sichuan University
Advanced Materials Research | Year: 2012

(Ti, W) C particles reinforced Fe-based surface composite coatings were fabricated by in-situ synthesis and powder metallurgy route. The microstructure, interface and wear properties were investigated by X-ray diffraction, scanning electron microscopy and dry sliding wear test. The results show that (Ti, W) C carbides form via in situ reaction between titanium, ferrotungsten and graphite. The morphology of (Ti, W) C is mainly rectangular form. The interface between (Ti, W) C and iron matrix is found to be free from cracks and deleterious phases. The coating reinforced by (Ti, W) C particles possesses higher wear resistance than that of the substrate. © (2012) Trans Tech Publications. Source


Wang J.,Sichuan Colleges and Universities | Fu S.,Chengdu Electromechanical College | Jiang B.,Chengdu Electromechanical College | Wang Y.,Sichuan University
Advanced Materials Research | Year: 2012

This study dealt with the processing, microstructure and wear behavior of vanadium carbide reinforced iron matrix composite. Powder technology combined with in situ synthesis was used to successfully fabricate the composite. The microstructure of the composite was characterized by X-ray diffraction, scanning electron microscope and transmission electron microscope. The microstructural study reveals that the round VC particles are distributed uniformly in the iron matrix, the interface between the iron matrix and VC is clean, and no interface precipitates is found. Dry-sliding wear behavior of VC-Fe composite was tested using MM-200 wear testing machine. The results indicate that the composite has excellent wear resistance, and microploughing and grooving are the dominant wear mechanisms for the composite. Hardness and bend strength of the composite are 62HRC and 990.1MPa, respectively. © (2012) Trans Tech Publications. Source


Wang J.,Sichuan Colleges and Universities | Fu S.,Chengdu Electromechanical College | Gao R.,Chengdu Electromechanical College
Advanced Materials Research | Year: 2012

This study dealt with the formation mechanism and microstructure of titanium carbide particulate reinforced Fe-based composite. The microstructure of the composite was characterized by scanning electron microscopy (SEM), the microstructural study reveled that the TiC particles were distributed uniformly in the iron matrix, and TiC particles had various morphology. The formation mechanism of titanium carbide was also investigated by differential thermal analysis (DTA) and X-ray diffraction(XRD). The experimental results indicated that titanium carbide formed at 1138.2°C. © (2012) Trans Tech Publications. Source


Jin Y.,University of Sichuan | Jin Y.,Sichuan Colleges and Universities | Ye F.,University of Sichuan | Huang B.,University of Sichuan | Yang R.,University of Sichuan
Nanoscience and Nanotechnology Letters | Year: 2012

VC-Cr3C2 nanocomposite powders with 20-100 nm were synthesized from precursors by vacuum carbothermal reduction at 900 °C for 2 h. The phase composition of the synthesized products with various ratios of chromium and vanadium was investigated systemically. The present study shows that there are not single-phase VC and Cr3C2 in VC-x wt% Cr3C2 (with 10 ≤ × ≤ 90) nanocomposite powders. When low-concentration V or Cr element exists in the reaction system, (V, Cr) C or (Cr, V)3C2 solid solution phase forms easily but the solubility of Cr atoms in VC lattices is larger than that V atoms in Cr3C2. With the increase of Cr addition, there is a shifting trend of (V, Cr) C diffraction peaks toward higher angle. Two phases of (V, Cr) C solid solution and Cr2VC2 compound exist in VC-50 wt% Cr3C2 and VC-70 wt% Cr3C2 system. Copyright © 2012 American Scientific Publishers. Source


Wang J.,Sichuan Colleges and Universities | Fu S.,Chengdu Electromechanical College | Li Y.,Sichuan Colleges and Universities
Advanced Materials Research | Year: 2012

A powder metallurgy technique combined with in-situ synthesis technique was applied to produce (Ti,W)C particulates reinforced iron matrix composite. The sintered composites were characterized by X-ray diffraction and scanning electron microscopy. (Ti,W)C and α-Fe were detected by X-ray diffraction analysis. The scanning electron micrographs revealed the morphology and distribution of the reinforcements. The results show that the rectangular (Ti,W)C carbides are distributed uniformly in the composite. The (Ti,W)C/Fe matrix interface is found to be free from cracks and deleterious phases. The reasons for the formation of coarse (Ti,W)C particles were also discussed. © (2012) Trans Tech Publications. Source

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