Jin Feng Xia
Chinese Academy of Sciences
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Featured researches published by Jin Feng Xia.
Key Engineering Materials | 2017
Qiang Li; You Jun Zheng; Jin Feng Xia; Dan Yu Jiang
Carbon nanotube plays an important role in various applications due to its extreme optic, electronic and mechanical properties. In the present work, attempts have made to investigate the effects of incorporation of multiwall carbon nanotubes (MWNTs) on microstructure and mechanical properties of SiC composites. Firstly, carbon nanotubes were modified by chemical method in order to add carboxyl group on their surface. Then modified carbon nanotubes were located on the surface on SiC particles by silicon coupling agent. A designed carbon nanotube reinforced composite was obtained after pressureless sintering. SEM was employed to investigate the micro-structure of as-prepared SiC material. Its properties of, such as density, hardness, strength, etc. were determined in detail. The relationship between the micro-structure and properties of carbon nanotube reinforced SiC composite were discussed.
Key Engineering Materials | 2016
Wei Yang; Qiang Li; Yan Yan Zhang; Dan Yu Jiang; Jin Feng Xia
a series of Eu(III)/Tb(III) complexes with а-thenoyl trifluoroacetone (HTTA), 8-hydroxy quinoline complexes were synthesized. The UV and fluorescence spectra of these complexes at room temperature were characterized. The results revealed that different energy transfer between rare earth ions and ligands.Keywords rare earth complexes, ultraviolet spectra, fluorescence spectra
Key Engineering Materials | 2016
Xiang Ma; Hong Qiang Nian; Le Kang; Jin Feng Xia
Nano-sized 3mol%molYF3-CaF2powder was prepared by co-precipitation method, the prepared powder and sintered ceramic was characterized by XRD and SEM technologies. Results clearly demonstrated that appropriate calcination temperature of 3mol%molYF3-CaF2 composite was below 500°C, and when the YF3-CaF2 ceramic sintering temperature was 900°C, the YF3was uniform doped in CaF2 ceramic successfully and the grain growth was very good.
Key Engineering Materials | 2016
Jian Wu; Cheng Zhang; Jin Feng Xia; Dan Yu Jiang
In this study, Yttria-stabilized zirconia (YSZ) electrochemical sensors attached with the WS2 sensing electrode (SE) were fabricated and examined for NO2 sensing properties. Due to its internal stratiform structure, surface and edge of the lamella have high chemical activity, WS2 was used as a kind of highly efficient catalyst. WS2 was partial oxidated to WO3 at 400°C, and with the increment of temperature, oxidation will accelerate. The ΔEMF to 500 ppm NO2 was as high as 125mv at 400°C, while the value of WO3-based sensor was as small as 10 mv in the same condition. These WS2-attached devices gave a linear correlation between EMF and the logarithm of NO2 concentration from 30 to 500 ppm in the temperature range 350–500°C. The response time of the device is about 1 min at 400°C.
Key Engineering Materials | 2016
Le Kang; Hong Qiang Nian; Xiang Ma; Jin Feng Xia
Evaluation the corrosivity of CaF2 in hot water and 10mol%HF solution was studies.Theprepared powder and sintered ceramic was characterized by XRD and SEM technologies. we could conclude that impurities (such as CaO and CaCO3) effected the porperties of CaF2, the grain size is smaller, the corrosion resistance is lower. The CaF2 of corrosion resistance was stronger in HF solution than hot water.
Key Engineering Materials | 2016
Meng Yun Dong; Cheng Zhang; Jin Feng Xia; Hong Qiang Nian; Dan Yu Jiang
CaF2 nano-power was prepared by direct precipitation methods with Ca(NO3)2 and KF as raw materials. The influences of presintering temperature and sintering temperature on the particle size and distribution of CaF2 nano-power were studied by X-ray diffraction (XRD) and field-emission scanning electron microscopy (FESEM). This study provided an experimental method for preparation of CaF2 nano-power. The results show that the best presintering temperature of CaF2 nano-power is 500°C and the best sintering temperature of CaF2 ceramic is 900°C.
Key Engineering Materials | 2013
Hong Qin Wang; Ge Ming Liu; Niu Sheng Peng; Tao Feng; Jin Feng Xia; Dan Yu Jiang; Xiuchun Yang
With the growing problem of automobile exhaust pollution, the study of automotive oxygen sensor is very meaningful, nitrogen oxides accounts for a large proportion of automobile exhaust. AC impedance spectroscopy of the NOx sensor in different temperature(500°C,600°C,700°C) and NO2 of different concentrations (100ppm,500ppm,1000ppm)in this paper, the influence of temperature and gas concentration on NOx sensors is explored.
Key Engineering Materials | 2013
Zheng Wang; Tai Bin Wang; Jian Yang; Tao Feng; Jin Feng Xia; Dan Yu Jiang
Through screen-printing technology, we prepared heater which is used for planar oxygen sensor with YSZ solid electrolyte, alumina insulating layer and platinum(Pt) paste, then sintered at different temperatures.Analysis the properties of Pt electrode through aging time test and thermal shock test. The results show that 1100°C is the best sintering temperature for Pt electrode.Resistance and surface morphology of Pt electrode changed obviously with aging time increasing and 100 times thermal shock is not enough to affect the morphology of electrode and the change of resistance has no regularity.
Key Engineering Materials | 2013
Jing Hui Cui; Tao Feng; Jin Feng Xia; Dan Yu Jiang; Ge Ming Liu; Niu Sheng Peng; Qiang Li
Through Mechanical grounding method, CaZrO3 – 8YSZ(8% in mol yttria stabilized zirconia) electrolyte samples with different amounts of CaZrO3 at 10wt%, 20wt%, 30wt% were sintered at different temperatures in Muffle furnace. The decomposition temperature of CaZrO3 is 825°C-900°C under one atmosphere. At high temperature, CaZrO3 decomposes into CaO and ZrO2. So Y2O3-CaO-ZrO2 complex is composed. The effects of the sintering temperature and the contents of the CaZrO3 on the conductivity, porosity, flexure strength, hardness were investigated. XRD and SEM were used to analyse the compositions and microcosmic morphology.
Key Engineering Materials | 2013
Jun Guo; Caixia Li; Lin Zhang; Jin Feng Xia; Dan Yu Jiang; Qiang Li
The layered FeOCl has been synthesized from Fe2O3 and FeCl3 by chemical vapor transport technique at 380°C., and an intercalation of sodium benzoate into as-synthesized FeOCl was conduct. After the intercalation composites were sonicated for 4 h in butyl alcohol, the colloidal suspension of layered iron oxide nanosheets was obtained. The FeOCl and the intercalation composites were analyzed by powder X-ray diffraction (XRD). Transmission Electron Microscopy (TEM) was also used to characterize the morphologies of the FeO+ Nanosheets. Except to this, the selected area electron diffraction was also performed to examine the iron nanosheets.