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Deng G.,CHALCO Guizhou Branch | Li W.-F.,Wengfu Group Co.
Xi'an Jianzhu Keji Daxue Xuebao/Journal of Xi'an University of Architecture and Technology | Year: 2011

In the present paper, the use of the gradient design and the wide-band laser cladding technology, on the surface of the TC4 alloy, the powder of CaHPO4·2H2O+CaCO3 whose Ca/P is 1.4 and 1.5, was mixed to prepare the gradient bioceramic coating with hydroxyapatite Ca10(PO4)6(OH)2 (HA), β-tricalcium phosphate β-TCP[β-Ca3(PO4)2]. With the aid of scanning electron microscope (SEM), X-ray diffraction (XRD) and other analysis, different Ca/P effected on the bioceraic coating microstructure was studied. Result shows: because the phosphor (P) is burned under the condition of the laser, when Ca/P is 1.5, the ceramic structure after laser cladding has better crystalline state than the ratio 1.4 of Ca/P. Different Ca/P powder and CeO2 contents have significant impact on synthesizing HA+β-TCP. When Ca/P is 1.4 and the addition of CeO2 reaches 0.4wt%, the synthesizing HA + β-TCP is the greatest amount; and when Ca/P is 1.5 and the content of CeO2 is between 0.2wt% and 0.4wt%, the synthesizing HA + β-TCP is the greatest amount. Source

Zhu J.,Guizhou University | Song X.X.,Guizhou University | Liu F.,Wengfu Group Co. | Li T.X.,Guizhou University
Advanced Materials Research | Year: 2013

As the widely used collector, environmental pollution and toxicity of xanthates have got more and more concerns. In the present work, the flocculation process had been used to treat xanthate wastewater. The results showed that Al2(SO4)3 was the optimal flocculant. At the conditions of dosage of 0.1mol L-1Al2(SO4)3 0.5 mL, the initial pH 6.5, vibrating time 90 min and settling time 120 min, sodium isobutyl xanthate was removed nearly up to 100%. © (2013) Trans Tech Publications, Switzerland. Source

Zhou M.,Wuhan University of Technology | Ying G.,Wuhan University of Technology | Li B.,Wuhan University of Technology | Xie T.,Wengfu Group Co.
Advanced Materials Research | Year: 2011

In this paper, an Infrared Sulfur Analyzer is set to measure the desulphurization degree during thermal decomposition of phosphor-gypsum, which provides a much quick, convenient, continuous and accurate method. It might be considered as an effective way to study kinetics of phosphor-gypsum (or phosphogypsum) thermal decomposition (or pyrolysis). With the help of this method, the desulphurization degree and desulphurization rate of broadly constituted phosphor-gypsum samples in the temperature range of 1250-1400°C were studied. The experimental results show that the desulphurization degree increase with the rising of temperature in the range of 1250-1300°C quickly, however, this increase is not obvious when the temperature is above 1300°C. Besides, the corresponding regression equations are obtained. The decomposition degree of phosphor-gypsum could be judged according to the regression equations mentioned above. © (2011) Trans Tech Publications, Switzerland. Source

Wang F.,East China University of Science and Technology | Li J.,East China University of Science and Technology | Hu Q.,East China University of Science and Technology | Yang X.,East China University of Science and Technology | And 3 more authors.
European Journal of Organic Chemistry | Year: 2014

We describe our attempts to fine-tune the reactivity and selectivity of N-fluorobenzenesulfonamide in fluorination reactions by changing the substituents on its phenyl rings. A series of N-fluorobenzenesulfonamides bearing substituents at the ortho, meta, and para positions were prepared, and were used in the enantioselective fluorination of 2-oxindoles catalysed by chiral palladium complexes. Fluorinating reagents 1b, 1c, 1d, 1e, 1h, 1i, and 1j gave similar results to 1a, while 1f, 1g, and 1n gave worse yields and selectivities. Under mild reaction conditions, a series of 3-fluoro-2-oxindoles were obtained in excellent yields (up to 98%) and enantioselectivities (up to 99% ee) using N-fluoro-4,4′-difluoro-benzenesulfonamide as the fluorination agent. Copyright © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source

He H.-M.,Wengfu Group Co. | Gao L.,East China University of Science and Technology | Yang X.-J.,East China University of Science and Technology | Yang X.-J.,CAS Shanghai Institute of Organic Chemistry | And 8 more authors.
Journal of Fluorine Chemistry | Year: 2013

The polypropylene/polydimethylsiloxane/graphite fluoride (PP/PDMS/GF) composites are prepared with dynamic curing technology by simple blending of polypropylene, graphite fluoride and polydimethylsiloxane, and then their superhydrophobic properties are investigated. The results indicates that the static WCA reaches 148 with a sliding angle 6 for surface sandpapered PP/PDMS/GF = 100/20/15 composite, which supplies a much economical and convenient method for preparing superhydrophobic materials. © 2013 Elsevier B.V. All rights reserved. Source

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