Ping An Liu

South China University of Technology, Shengcheng, Guangdong, China

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Publications (8)0.42 Total impact

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    ABSTRACT: A new synthesis technology of titanium carbide with microwave is introduced in this article. Microwave synthesis technology is a fast and relatively low temperature of synthesis method. Nano-titanium carbide powders were synthesized by carbothermal reduction of titanium dioxide and carbon black with the microwave synthesis method at 1100°C-1400°C in argon gas atmosphere. Nano-TiO2 powder and carbon black were used as raw materials. The TiC powders were characterized with the XRD and TEM. The experimental results show that the synthesis rate is quick, even at relatively low synthesis temperature. The average particle size of the TiC powders synthesized by the microwave synthesis technology under low temperature (
    11/2011; 399-401:561-564. DOI:10.4028/www.scientific.net/AMR.399-401.561
  • Zhi Jie Zhang, Hong Ke Li, Ping An Liu
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    ABSTRACT: The influences of phenolic resin on the properties of both Magnesium oxychloride cement (MOC) pastes and MOC abrasive tools were investigated in this study. By incorporating phenolic resin in the MOC pastes,With 5% phenolic resin ,the compressive strength of MOC paste decreased by 26% , the flexural strength of MOC pastes decreased by 21%, the abrasion loss of MOC abrasive tools decreased by 37%, the strength softening coefficient greatly increased. The mechanism maybe due to the microstructure of the MOC pastes became more compact with phenolic resin adding, the rate of hydrolyzation reaction of MOC phases would be postponed.
    11/2011; 399-401:1358-1362. DOI:10.4028/www.scientific.net/AMR.399-401.1358
  • Ping An Liu, Xiao Heng Shi
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    ABSTRACT: By using the theory and method of topology structure design of parallel robotic mechanisms, the degrees of freedom (DOF) is analyzed based on 4-DOF(3T1R) asymmetric parallel robots in this paper. Then, the inverse and forward kinematics of the manipulator are calculated through establishment of constrained equations with analytical approach.
    08/2011; 308-310:1252-1257. DOI:10.4028/www.scientific.net/AMR.308-310.1252
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    ABSTRACT: Ca3Co4O9 ceramics were prepared using the sol-gel process with ordinary pressing sintering and their thermoelectric properties were measured from room temperature to 673 K. The experimental results show that single phase Ca3Co4O9 can be fabricated at 750–900 °C in different citrate acid molar proportions for 0.2–1.0. For all the oxides, both the Seebeck coefficients S and the electrical conductivities κ increase with the increasing temperature. The Seebeck coefficients S are all positive. The thermal conductivities k increase with the increasing temperature also and the lattice thermal conductivity κ l plays an important role to the thermal conductivity κ. The citrate acid molar proportions have a large influence on the particle sizes, which influences the thermoelectric properties of the ceramics. The figure of merit increases with the increasing temperature and reaches 4.5×10−5 K−1 at 573 K for the sample in the citrate acid molar proportion of 0.46.
    Journal of Wuhan University of Technology-Mater Sci Ed 01/2010; 25(2):287-290. DOI:10.1007/s11595-010-2287-x · 0.42 Impact Factor
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    ABSTRACT: A new control method of the particle orientation structure with super high magnetic field is studied for Al2O3 ceramics. Al2O3 slurry was made with two types of Al2O3 particles, which one was spherical shape of, and the other one was elongated shape of. The Al2O3 ceramics of orientation structure was fabricated by drying the Al2O3 slurry under the super high magnetic field, cold isostatic pressing (CIP) and sintering. Effects of particle shape, particle size, the solid loading, slurry viscosity, dispersant content and the magnetic field strength on the particle orientation structure were examined in detail. The experimental results indicate that even the spherical Al2O3 particles can align under the magnetic field; the particle orientation degree changes with the particle shape and the solid loading under same magnetic field strength conditions, and the elongated particle system is easier to align than the spherical particle system; the particle orientation degree of the Al2O3 ceramics can be controlled by adjusting the particle shape, particle size, solid loading, slurry viscosity, dispersant content and magnetic field strength.
    Key Engineering Materials 01/2008; 368-372:688-690. DOI:10.4028/www.scientific.net/KEM.368-372.688
  • Key Engineering Materials 01/2008; 368-372:1077-1079. DOI:10.4028/www.scientific.net/KEM.368-372.1077
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    ABSTRACT: The perovskite-type La0.8Sr0.2CoO3 supported on the mullite fiber porous ceramics was prepared by means of the impregnating method, and was then characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD); thus we can come to the conclusion that the perovskitetype composite oxidant can disperse on the surface of mullite fiber ceramics. The catalytic activity of the La0.8Sr0.2CoO3 for NO and CO was evaluated. The effect of the doped 0.1 wt-% PdCl2 on the catalytic activity of the perovskite-type La0.8Sr0.2CoO3 was also discussed. The results show that the conversion rates of NO and CO respectively reaches 74.5% and 99% at 601�C without doped Pd, and both reach 100% at 350�C with a little doped Pd.
    Frontiers of Chemical Engineering in China 10/2007; 1(4):372-376. DOI:10.1007/s11705-007-0067-8
  • Key Engineering Materials 01/2007; DOI:10.4028/www.scientific.net/KEM.336-338.1983