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Wang L.-L.,Shaanxi University of Science and Technology | Wang X.-F.,Shaanxi University of Science and Technology | XuDing,Western Metal Materials Co. | Zhu J.-F.,Shaanxi University of Science and Technology
Science of Sintering | Year: 2012

The bioglass modified HA-Al2O3 composites were successfully fabricated by mixing HA, synthesized by wet chemical method between precursor materials H3PO4 and Ca(OH)2, with 25wt% Al2O3 and different content of bioglass (5%, 25%, 45%, 65wt%) respectively, with a mole fraction of 53.9%SiO2, 22.6%Na2O, 21.8%CaO, and 1.7wt%P2O5, sintered in air at various temperatures (750-950°C) for 2h. when the content of bioglass is below 45wt% in the composite, HA decomposes completely and transforms to β-TCP. The main phase in this case are β-TCP, Al2O3 and Ca3(AlO3)2.When the content of bioglass is above 45wt% in the composite, the decomposition of HA to β-TCP is suppressed and the main phases in this case are Al2O3 and HA, DCP CaHPO4 and β-TCP, which almost have the same chemical composition, forming ternary-glass phase, and have better bioactive than pure HA. It can also be found that at the certain addition of bioglass, the higher sintered temperature, the bigger volume density and flexural strength of the composite are, but when the sintered temperature reaches 950°C, they decrease. This modified HA-Al2O3 composites by calcium silicate glass have a much lower sintering temperature and decrease the production cost much. Source


Wang A.,Xian University of Science and Technology | Wang A.,Shandong University | Ma X.,Western Metal Materials Co. | Lu Y.,Shandong University | And 2 more authors.
Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | Year: 2010

The microstructure, size distribution, specific surface area, and pore size distribution were characterized by the scanning electron microscope, laser diffraction particle size analyzer and specific surface area analyzer, respectively. The results indicate hydroxyapatite (HA) particles have a regular spherical shape, narrow particle size and pore size distribution. Its specific surface area is 44.135 m2/g, and its total pore volume is 0.2911 cm3/g. The HA column was prepared using the slurry packed method, and its characteristics was evaluated through high performance liquid chromatograph. The results imply that the column has a high efficiency. Source


Qi F.-Q.,Shaanxi University of Science and Technology | Jing X.-D.,Shanghai Institute of Technology | He K.,Western Metal Materials Co.
Procedia Engineering | Year: 2011

The control system uses LABVIEW as the software development platform. The system includes ADLINK motion control card PCI-8134, LEETRO stepper motor drivers DMD 402A, and tables with LEETRO DM4240A stepper motors. The system uses ADLINK PCI-8134 to send stepping pulse signal PUL and direction level signal DIR to control the stepper motor's rotation angle and direction, achieving the motor' positive and negative rotation, acceleration, constant speed and deceleration, then achieving the radial motion of table's Z-axis slider along the surface of the measured part, the axial motion of X-axis slider along the surface of the measured part and the spindle rotation for the measurement of roundness and cylindricity. © 2011 Published by Elsevier Ltd. Source


She Y.,Shaanxi University of Technology | Zhang Z.H.,Shaanxi University of Technology | Ju J.T.,Shaanxi University of Technology | Jin B.,Western Metal Materials Co.
Materials Science Forum | Year: 2015

The continuous cooling phase transformation behavior of niobium microalloyed steel was studied by Thermecmastor-Z thermomechanical simulator; the continuous cooling transformation curves (CCT) were established. The change of microstructure under different cooling rates was observed, and the influence of deformation in austenite non-recrystallization region on transformation was discussed. Based on these work, it was possible to know that the phase transformation is retarded and the ferritic grain is refined dramatically as the cooling rate increasing. The deformation in austenite non-recrystallization region caused deformation stored-energy, which improved the grain refinement of transformation to some extent, but not significant. © (2015) Trans Tech Publications, Switzerland. Source


Wang L.-L.,Shaanxi University of Science and Technology | Wang X.-F.,Shaanxi University of Science and Technology | Ding X.,Western Metal Materials Co. | Jiang H.-T.,Shaanxi University of Science and Technology
Materials and Manufacturing Processes | Year: 2013

HA-Bioglass-Al2O3 composites were successfully fabricated by mixing HA, synthesized by wet chemical method between precursor materials H3PO4 and Ca(OH)2, with 25 wt% Al2O3 and different content of bioglass (5, 25, 45, and 65 wt%), respectively, with a mole fraction of 53.9%SiO2, 22.6%Na 2O, 21.8%CaO, and 1.7 wt%P2O5, sintered in air at relative low temperature (750-950°C) for 2 h. It can be seen that when the content of bioglass is above 45 wt% in the composite, the decomposition of HA to β-TCP, considerable thermal reaction and phase degradation are suppressed, and the main phases in this case are Al2O3, HA, and a small amount of DCP (CaHPO4) and β-TCP, which almost have the same chemical composition, forming ternary-glass phase, and have better bioactive than pure HA. It can also be found that the exposed HA particles increase with the increasing of the bioglass content in the mixture. A large number of HA particles stacked together are subjected to form roughened surface, wherein microcracks, voids, and pores are observed, suggesting that pressureless-sintering is not the best way for densification of HA-Bioglass-Al2O3 composite. © Taylor and Francis Group, LLC. Source

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