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| 1 | H13钢表面激光熔覆NiFeBSi-Si_3N_4合金的组织及腐蚀性能显示文摘利用连续波CO2激光器分别在H13钢表面激光熔覆N iFeBSi-Si3N4和N iFeBSi合金,考察了Si3N4对N iFeB-Si合金组织及腐蚀性能的影响。采用光学显微镜、扫描电子显微镜、X射线衍射仪及动电位极化技术对熔覆层的组织及腐蚀性能进行研究。结果表明,N iFeBSi-Si3N4合金激光熔覆层与H13钢基体形成了良好的冶金结合,改性层呈细密的枝晶状组织,无孔洞裂纹等缺陷。与N iFeBSi合金相比,N iFeBSi-Si3N4合金激光改性层在工业用脱膜剂介质中腐蚀电位正移,腐蚀电流密度下降,抗孔蚀能力提高。 | 张春华 张松 张宁 H.C.Man | 2006 | 金属热处理2006，31，9： | 10 |
| 2 | Formation of TiN Grid on NiTi by Laser Gas Nitriding for Improving Wear Resistance in Hanks' Solution显示文摘Laser gas nitriding(LGN)is a common surface modi?cation method to enhance the wear resistance of titanium(Ti)alloys,which are known to have poor tribological properties.In the present study,a titanium nitride(TiN)grid network was fabricated on the surface of nickel titanium(NiTi)by LGN.The laser processing parameters were selected to achieve nitriding without surface melting and hence to maintain a smooth surface?nish.The characteristics of the grid-nitrided samples were investigated by scanningelectron microscopy,X-ray diffractometry,optical microscopy,2-D pro?lometry,contact angle measurements and nanoindentation.The wear resistance of the nitrided samples was evaluated using reciprocating wear test against ultra-high-molecular-weight polyethylene(UHMWPE)in Hanks’solution.The results indicate that the wear rates of the grid-nitrided samples and the UHMWPE counter-body in the wear pair are both signi?cantly reduced.The decrease in wear rates can be attributed to the combination of a hard TiN grid and a soft NiTi substrate.In Hanks’solution,the higher hydrophilicity of the nitrided samples also contributes to the better performance in wear test against hydrophobic UHMWPE. | C.H.Ng O.K.Chan H.C.Man | 2016 | Journal of Materials Science & Technology2016，32，5： | 3 |
| 3 | Laser additive manufacturing of biodegradable Mg-based alloys for biomedical applications: A review显示文摘Metallic implants are widely used in internal fixation of bone fracture in surgical treatment.They are mainly used for providing mechanical support and stability during bone reunion,which usually takes a few months to complete.Conventional implants made of stainless steels,Ti-based alloys and CoCrMo alloys have been widely used for orthopedic reconstruction due to their high strength and high corrosion resistance.Such metallic implants will remain permanently inside the body after implantation,and a second surgery after bone healing is needed because the long-term presence of implant will lead to various problems.An implant removal surgery not only incurs expenditure,but also risk and psychological burden.As a consequence,studies on the development of biodegradable implants,which would degrade and disappear in vivo after bone reunion is completed,have drawn researchers’attention.In this connection,Mg-based alloys have shown great potentials as promising implant materials mainly due to their low density,inherent biocompatibility,biodegradability and mechanical properties close to those of bone.However,the high degradation rate of Mg-based implants in vivo is the biggest hurdle to overcome.Apart from materials selection,a fixation implant is ideally tailor-made in size and shape for an individual case,for best surgical outcomes.Therefore,laser additive manufacturing(LAM),with the advent of sophisticated laser systems and software,is an ideal process to solve these problems.In this paper,we reviewed the progress in LAM of biodegradable Mg-based alloys for biomedical applications.The effect of powder properties and laser processing parameter on the formability and quality was thoroughly discussed.The microstructure,phase constituents and metallurgical defects formed in the LAMed samples were delineated.The mechanical properties,corrosion resistance,biocompatibility and antibacterial properties of the LAMed samples were summarized and compared with samples fabricated by traditional processes.In addition,we have made some suggestions for advancing the knowledge in the LAM of Mg-based alloys for biomedical implants. | C.L.Wu W.J.Xie H.C.Man | 2022 | Journal of Magnesium and Alloys2022，10，4： | 1 |
| 4 | Nature of Surface Layer and Electrochemical Behavior of NaOH Hydrothermally Treated NiTi Alloy显示文摘NiTi samples were hydrothermally treated in NaOH at 200℃ with different soaking times. The morphology of the surface layer formed was studied by scanning electron microscopy (SEM). The composition of the layer and the major phases present were determined by energy-dispersive spectroscopy (EDS) and X-ray diffractometry (XRD), respectively. In contrast to the results reported by some authors, the surface layer was essentially Ni(OH)2 instead of being TiO2. The electrochemical behavior of the samples was studied by electrochemical impedance spectroscopy (EIS) in 3.5% NaCI solution at 23℃, and analyzed using a simplified Randle circuit consisting of a resistance R and a capacitance C in parallel. After hydrothermal treatment, R was increased by a factor ranging from 1.5 to 5.0 times, depending on the treatment time. The value of R of all the samples became steady within a period of less than 15 h. Results of the present study indicate that alkaline treatment leads to the growth of an insulating layer on NiTi, but the method is not suitable for surface modification of NiTi implants due to the enhanced Ni content in the surface layer. | P.Shi F.T.Cheng H.C.Man | 2004 | Journal of Materials Science & Technology2004，20，2： | 0 |
| 5 | A Comparison of Laser Cladding Ni-based Coating on an Aluminium Alloy with CO_2 Laser and Nd: YAG Laser显示文摘AComparisonofLaserCladdingNi-basedCoatingonanAluminiumAloywithCO2LaserandNd:YAGLaserLiangGongyingEric.T.T.WongH.C.ManXi’anJia... | Liang Gongying Eric.T.T.Wong H.C.Man Xi’an Jiaotong UniversityXi’an, 710049 The Hong Kong PolytechnicUniversity, Hong Kong | 1997 | International Journal of Plant Engineering and Management1997，2，2： | 0 |
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