Author
Shitang Zhang
Bio: Shitang Zhang is an academic researcher from Chinese Academy of Sciences. The author has contributed to research in topics: Coating & Magnesium alloy. The author has an hindex of 9, co-authored 11 publications receiving 391 citations.
Topics: Coating, Magnesium alloy, Deep drawing, Formability, Microstructure
Papers
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15 Sep 2008-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this paper, a NiAl/hBN coating was successfully prepared on a Ni-based superalloy substrate by means of laser cladding, and the microhardness profile of the composite coating along the depth direction was measured, while its cross-sectional microstructures and phase compositions were analyzed using means of scanning electron microscopy and X-ray diffraction.
Abstract: NiAl/hBN coating was successfully prepared on a Ni-based superalloy substrate by means of laser cladding. The microhardness profile of the composite coating along the depth direction was measured, while its cross-sectional microstructures and phase compositions were analyzed by means of scanning electron microscopy and X-ray diffraction. Moreover, the friction and wear behavior of the composite coatings sliding against Si3N4 from ambient to 1000 °C was evaluated using a ball-on-disc friction and wear tester, and the worn surface morphologies of the composite coatings were observed using a scanning electron microscope. It was found that the laser cladding NiAl/hBN coating on the Ni-based superalloy substrate had high microhardness and good friction-reducing and antiwear abilities at elevated temperatures up to 1000 °C. The friction and wear behavior of the laser cladding NiAl/hBN coating was strongly dependent on test temperatures. The coating had a small friction coefficient and wear rate as it slid against the ceramic counterpart at elevated temperatures up to 1000 °C. The wear mechanism was characterized by mixed adhesion and abrasive wear as it slid against the ceramic ball below 300 °C and mild adhesion wear and plastic deformation up to 400 °C and above.
91 citations
TL;DR: In this article, the laser cladding Ti-Al coatings were analyzed with X-ray diffraction (XRD), scanning electron microscope (SEM) and Xray energy dispersive spectroscopy (EDS) and it was found that with the increase of Al content, the diffraction peaks shifted gradually to higher 2 θ values.
66 citations
TL;DR: In this article, the surface hardness and wear resistance of the TiC/Ti3Al IMC coatings increased with the increasing volume fraction of TiC powder, and the wear resistance was improved by the formation of these IMC coating.
62 citations
15 May 2008-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this paper, the growth morphologies of the reinforced phase in the TiN/Ti3Al IMC coatings were found to be granular-like, flake-like and undeveloped dendrites at lower N2 flow rate; and granularlike, unde developed and developed dendrees at higher N 2 flow rate.
Abstract: TiN reinforced Ti3Al intermetallic matrix composite (TiN/Ti3Al IMC) coatings were in situ synthesized on a pure Ti substrate with Ti + Al mixed powders in nitrogen atmosphere by laser cladding and laser nitriding. It was found that the growth morphologies of the TiN reinforced phase in the TiN/Ti3Al IMC coatings were granular-like, flake-like, and undeveloped dendrites at lower N2 flow rate; and granular-like, undeveloped and developed dendrites at higher N2 flow rate. In addition, the volume fraction of the TiN phase increased with increasing nitrogen flow rate. The hardness of the TiN/Ti3Al IMC coatings was higher than that of the Ti3Al coating, which increased with increasing volume fraction of the TiN phase. Friction and wear tests revealed that the wear resistance of TiN/Ti3Al IMC coatings was superior to those of pure Ti and Ti3Al coating. It is well worth noting that the TiN/Ti3Al IMC coatings showed excellent wear resistance under lower normal loads.
59 citations
TL;DR: In this paper, the hardness of the titanium aluminides coatings was found in the following order: Ti3Al coating, TiAl coating and TiAl3 coating, while the wear volume of pure Ti and the titanium aluminum coatings all increased with increasing normal load.
Abstract: Titanium aluminides coatings were in-situ synthesized on a pure Ti substrate with a preplaced Al powder layer by laser surface alloying. The friction and wear properties of the titanium aluminides coatings at different normal loads and sliding speeds were investigated. It was found that the hardness of the titanium aluminides coatings was in the following order: Ti3Al coating > TiAl coating > TiAl3 coating. Friction and wear tests revealed that, at a given sliding speed of 0.10 m/s, the wear volume of pure Ti and the titanium aluminum coatings all increased with increasing normal load. At a given normal load of 2 N, for pure Ti, its wear volume increased with increasing sliding speed; for the titanium aluminides coatings, the wear volume of Ti3Al coating and TiAl coating first increased and then decreased, while the wear volume of TiAl3 coating first decreased and then increased with increasing sliding speed. In addition, the friction coefficients of pure Ti and the titanium aluminides coating decreased drastically with increasing sliding speed. Under the same dry sliding test conditions, the wear resistance of the titanium aluminium coatings was in the following order: Ti3Al coating > TiAl coating > TiAl3 coating.
48 citations
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TL;DR: In this article, the development of laser cladding for functional coatings with high wear resistance, good corrosion and oxidation resistance, and better medical biocompatibility is reviewed, and the existing problems and the corresponding solutions are discussed.
417 citations
303 citations
TL;DR: In this article, a review on the current research developments in high temperature solid-lubricating materials is provided, including design strategies of a low friction coefficient, a high wear resistance, and a wide environment range.
229 citations
TL;DR: In this paper, a mixture of SiC and Al2O3 powders of different weight ratios was packed into a groove of 3mm width and 1.5mm depth cut on the aluminum plate, and covered with an aluminum sheet 2mm thick.
215 citations
TL;DR: A comprehensive survey of welding processes used to deposit wear resistant overlays is presented in this paper, based on both literature review and research work performed at the Canadian Centre for Welding and Joining.
173 citations