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| 1 | Sol-gel Derived TiO_2-Bioactive glass-Hydroxyapatite Bioactive Coating on Titanium Alloy Substrate显示文摘Coating the hydroxyapatite (HA) on the titanium alloy surface can obtain a bioactive implant with high mechanical properties.However,the bonding force between the titanium alloy and the HA was low due to their different coefficient of thermal expansion (CET).Preparing the multi-layer coating with alleviated thermal stress on titanium alloy substrate is few reported.Fabrication of a TiO2-bioactive glass (BG)-HA bioactive coating was proposed to solve this problem.A particular TiO2 surface was prepared on the titanium alloy substrate by micro-arc oxidation treatment.The BG and HA coating were coated onto the TiO2 surface in turn by using a sol-gel method.The microstructure,surface morphology and phase composition of the coatings were analyzed.The bonding force of coatings was investigated by the nick apparatus.In vitro dissolution was performed by soaking the TiO2-BG-HA coated samples into the simulated body fluid for various periods.Micro-structural observations indicated that no delamination and crack occurred at the interface of HA/BG and BG/TiO2.The bonding between the substrate and coating consists of the mechanical interaction and the chemical bonding.The bonding force could reach about 45 N.The TiO2-BG-HA coating displayed the excellent forming ability of bone-like apatite when it was soaked into the simulated body fluid.This work suggests an innovative way to reduce the internal stress among coatings through varying BG composition to adjust its CTE,so as to enhance the bonding force. | ZHAO Kang LUO Defu TANG Yufei ZHANG Dawei | 2010 | Chinese Journal of Mechanical Engineering2010，23，2： | 1 |
| 2 | QPQ salt bath nitriding and corrosion resistance显示文摘 | Li Yuanhui Luo Defu | 2006 | Solid State Phenomena2006，118，： | 1 |
| 3 | Effect of QPQ salt bath oxidation on corrosion resistance 显示文摘 | Li Yuanhui Luo Defu | 2006 | Solid State Phenmena2006，118，： | 1 |
| 4 | QPQ salt bath nitriding and corrosion resistance 显示文摘 | Li Yuanhui Luo Defu Wu Shaoxu | 2006 | Heat Treatment of Materials2006，118，： | 1 |
| 5 | Microstructural studies of QPQ complex salt bath heat-treated steels显示文摘 | LI Huiyou LUO Defu YEUNG C F | 1997 | Journal ofMaterialsProcessingTechnology1997，69，123： | 1 |
| 6 | Probabilistic assessment of available transfer capability considering spatial correlation in wind power integrated system显示文摘 | Luo Gang Chen Jinfu Cai Defu | 2013 | IET Gener Transm Distrib2013，7，12： | 1 |
| 7 | QPQ salt bath Nitriding and corrosionresistance显示文摘 | Li Yuanhui Luo Defu | 2006 | Solid State Phenomena2006，118，： | 1 |
| 8 | Effect of QPQ salt bath oxidation oncorrosion resistance显示文摘 | Li Yuanhui Luo Defu | 2006 | Solid state Phenomena2006，118，： | 1 |
| 9 | Effect of Cryogenic and QPQ Compound Treatment on the Microstructures and Performance of High Speed Steel显示文摘China’s High-speed steel cutting tools hold a considerable share in the global market.However,the overproduction of low-end HSS tools causes serious resource waste and low efficiency,which has become one of the major problems in the tool industry in China.So a new Surface Modification technology is developed,which can make the low-end HSS tools into the high-end ones.On the analysis of the mechanism of cryogenic and quenching-polish-quenching(QPQ),the cryogenic and QPQ compound treatment are studied by using φ8 HSS(M2) drills.The nitriding layer and the base of the drill bit are Studied and analyzed,and the mechanism of compound treatment is discussed by the technological parameters adjustment and the combination test of cryogenic,nitrogen,tempering procedures,and several analysis methods such as the optics metallographic microscope,the scanning electronic microscope (SEM),X-ray diffraction and micro hardness.The cutting test is done on the drills by cryogenic treatment,QPQ treatment and cryogenic and QPQ compound treatment separately.The results indicates that the cutting life of HSS (M2) drill can be increased dramatically by cryogenic and QPQ compound treatment. | LUO Defu LI Shen | 2012 | Chinese Journal of Mechanical Engineering2012，25，1： | 0 |
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