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Zhang L.Y.,Guizhou University | Liu Q.B.,Guizhou University | Liu Q.B.,Guizhou Key Laboratory for Microstructure and Strength of Materials | Jiang P.Z.,Guizhou University | Zhang Z.,Guizhou University
Applied Mechanics and Materials | Year: 2013

To improve bonding strength between Ti alloy and bioceramic coating and to eliminate thermal stress during laser cladding, gradient bioceramic coating materials is designed. The bioceramic coating is fabricated by wide band laser cladding technique. And the effect of adding single and multiple rare earth oxide on microstructure is investigated. The samples are soaked with SBF for 14 days, the experimental results indicate that when the content of single rare earth oxide is 0.6wt. %Y2O3, a large number of bioactivity phase and chrysanthemum shape microstructure can be observed. When the content of single rare earth oxide is 0.2wt. %Sm2O3, a lot of bioactivity phase and coral reef shape microstructure can be observed. When the content of multiple rare earth oxide is 0.3wt. %Sm2O3 and 0.4wt.%Y2O3, a large amount of bioactivity phase and more homogeneous and dense spherical particles can be observed on coating, which demonstrates the microstructure is of better bioactivity. © (2013) Trans Tech Publications Switzerland. Source


Lu P.,Guizhou University | Lei Y.,Guizhou University | Lu S.,Guizhou University | Wang Q.,Guizhou University | Liu Q.,Guizhou Key Laboratory for Microstructure and Strength of Materials
Analytica Chimica Acta | Year: 2015

Glucose detection plays very important roles in diagnostics and management of diabetes. The search for novel catalytic materials with appropriate architectures is the key step in the fabrication of highly sensitive glucose sensors. In this work, α-Ni(OH)2 roselike structures (Ni(OH)2-RS) assembled from nanosheet building blocks were successfully synthesized by a hydrothermal method through the hydrolysis of nickel chloride in the mixed solvents of water and ethanol with the assistance of polyethylene glycol (PEG). The structure and morphology of the roselike α-Ni(OH)2 were characterized by transmission electron microscopy (TEM), field emission scanning electron microscopy (FE-SEM), X-ray photoelectron spectroscopy (XPS), X-ray powder diffraction (XRD) and N2 adsorption-desorption isotherm measurement. TEM and FE-SEM images showed that the synthesized Ni(OH)2 was roselike and the size of the leaf-shaped nanosheet was about 5nm in thickness, which leads to larger active surface areas and faster electron transfer for the detection of glucose. Compared with the bare GCE and bulk Ni(OH)2/GCE, the Ni(OH)2-RS/GCE had higher catalytic activity toward the oxidation of glucose. Under the optimal conditions, the Ni(OH)2-RS/GCE offers a variety of merits, such as a wide linear response window for glucose concentrations ranging from 0.87μM to 10.53mM, short response time (3s), a lower detection limit of 0.08μM (S/N=3), as well as long term stability and repeatability. © 2015 Elsevier B.V.. Source


Feng L.,Guizhou University | Liu Q.-B.,Guizhou University | Liu Q.-B.,Guizhou Key Laboratory for Microstructure and Strength of Materials
Advanced Materials Research | Year: 2012

To improve the service performance of roller. The surface of roller was alloyed by a 5kW CO 2 laser. The microstructure, hardness and wear resistance were investigated by means of OM, XRD, Micro-hardness Testing Machine and MMS-2A screen display friction tester. The experimental results indicate that excellent metallurgical bonding is obtained between alloying layer and substrate, the main microstructure of laser alloying coating is composed of phases such as γ-Fe, Fe(Ni,Cr), (Fe,Cr) 7C 3, MoC, Fe 2MoC, WC and SiC etc. The strengthening mode is particle-reinforced mechanism. The corrosion resistance of connection zone is better than that of alloying zone. The average of microhardness value is as high as 718 HV, which is more two times than that of substrate, and the average of wear resistance value of alloying layer is approximately three times larger than that of substrate. © (2012) Trans Tech Publications, Switzerland. Source


Wang Z.,Guizhou University | Liu Q.-B.,Guizhou University | Liu Q.-B.,Guizhou Key Laboratory for Microstructure and Strength of Materials | Xiao M.,Guizhou University | Yang B.-C.,University of Sichuan
Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment | Year: 2011

To improve the quality of rare earth active bioceramic gradient coatings, a method of electric polarized treatment(PAS) was used to post-process the gradient coatings fabricated by wide band laser cladding in alkali liquid. The phases and corrosion resistance of the bioceramic coatings were analyzed by XRD and an electrochemical analyzer. The bioceramic coatings were immersed in simulated body fluid(SBF) to examine its bioactivity and its electrical charge. The experimental results indicate that PAS treatment not only improves the crystallinity of the coatings, but also is favourable to transform additional phases into hydroxyapatite. PAS treatment exhibits a little effect on corrosion resistance of the bioceramic coatings. Compared with as-received coatings, the coatings treated by PAS are of better bioactivity and more negative charge. Source


Zhang L.Y.,Guizhou University | Liu Q.B.,Guizhou University | Liu Q.B.,Guizhou Key Laboratory for Microstructure and Strength of Materials
Advanced Materials Research | Year: 2013

To improve bonding strength between titanium alloy and coating and to eliminate thermal stress during laser cladding, a gradient coating materials is designed. And the gradient coating with different contents of multiple rare earth deoxide was produced by wide band laser cladding technique. The experimental results indicate that when addition of Sm2O3 is fixed to 0.3wt.%, as addition of Y2O3 increases, the microstructure of bioceramic is different. When addition of Y2O3 reaches 0.4wt.%, the amount of Ca-P based bioactive phases such as HA, α-TCP as well as β-TCP becomes biggest. After soaking the coating with 0.3wt.% Sm2O3 and 0.4wt.% Y2O3 in SBF for 14 days, a large amount of Ca-P white spherical particles can be observed on coating, which demonstrates the bioceramic coating is of best bioactivity. © (2013) Trans Tech Publications, Switzerland. Source

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