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Liu Y.-H.,Shenyang Ligong University | Zhi Y.,Shenyang Ligong University | Zuo J.-C.,Shenyang Ligong University | Li Y.,Liaoning Key Laboratory for Ecologically Comprehensive Utilization of Boron Resource and Materials | And 3 more authors.
Yuanzineng Kexue Jishu/Atomic Energy Science and Technology | Year: 2015

Borate whisker/high density polyethylene (HDPE) composite materials were prepared using magnesium borate and aluminum borate whiskers as neutron absorber object. The effects on tensile strength and shielding ratio of the composites were studied and the experiment results were compared with boron carbide (B4C) commonly used as shielding materials. The results show that the shielding ratio of three composite materials to the thermal neutron is B4C>Mg2B2O5>Al4B2O9. The shielding ratio of the composite material increases with borate content and thickness of the composite material. The shielding ratio of the composite material is 86.58% when the thickness of the Mg2B2O5 whisker/HDPE composite material is 15.76 mm. The tensile strength of the whisker/HDPE composite material increases with whisker content. The tensile strength of the Mg2B2O5 whisker/HDPE composite material with 9.1% content of Mg2B2O5 whisker is 24.39 MPa. The composites enhanced by whisker possess prominent mechanical properties compared with B4C/HDPE composite material. ©, 2015, Atomic Energy Press. All right reserved. Source


Cao X.,Northeastern University China | Cao X.,Liaoning Key Laboratory for Ecologically Comprehensive Utilization of Boron Resource and Materials | Wang H.,Northeastern University China | Meng X.,Northeastern University China | And 5 more authors.
Advanced Materials Research | Year: 2011

High temperature electrochemical synthesis of tungsten boride has been performed in KF-KCl melts with B2O3 and WO3 used as reactants at 1033K. The cathode product was investigated in the current density range 0.4A/cm2-0.6A/cm2and characterized by means of XRD analyses and SEM. The results indicated that cathode product is mainly consist of W2B5 and WB4, the powders are fine (<0.5um). Current density exert a great effect on the phase composition, particle size and morphology of the cathode product. © (2011) Trans Tech Publications, Switzerland. Source


Jiang T.,Northeastern University China | Jiang T.,Liaoning Key Laboratory for Recycling Science of Metallurgical Resources | Jiang T.,Liaoning Key Laboratory for Ecologically Comprehensive Utilization of Boron Resource and Materials | Zhang Q.,Northeastern University China | And 4 more authors.
Huagong Xuebao/CIESC Journal | Year: 2014

Based on TG-DTA analysis, boron mud, the solid waste of boron chemical industry, was roasted in a muffle oven and a microwave furnace at different temperatures, and the roasted products were processed through alkaline leaching and acid leaching to extract separately valuable Si and Mg components. The effects of roasting methods and temperature on leaching rates of SiO2 and MgO were investigated. Chemical and phase compositions as well as micro-structures of the roasting products, obtained silica and magnesium oxide were analyzed and characterized by chemical analysis, XRD and SEM. The results indicate that the activity of the boron mud increases after both two types of roasting. The optimal process parameters are 600℃ and 30 min for the roasting in muffle oven and 500℃ and 10 min for doing in microwave furnace. At these conditions, the leaching rates of SiO2 and MgO reach 97.65% and 98.81% for former and 98.03% and 98.83% for later, respectively. The silica prepared, containing 92.20% SiO2, consists of nearly spherical grains with diameter ranges from 100 to 200 nm. And the magnesium oxide obtained, containing 93.05% MgO, makes of plate-like grains with diameter about 2 μm. ©All Rights Reserved Source


Jiang T.,Northeastern University China | Jiang T.,Liaoning Key Laboratory for Recycling Science of Metallurgical Resources | Jiang T.,Liaoning Key Laboratory for Ecologically Comprehensive Utilization of Boron Resource and Materials | Yin L.,Northeastern University China | And 4 more authors.
Huagong Xuebao/CIESC Journal | Year: 2014

Based on TG-DTA analysis, a sodium-roasting and water-leaching process were employed for the preparation of borax from boron concentrate, using Na2CO3 as sodium treatment reagent. The effects of Na2CO3 content, roasting temperature and holding time on leaching rate of B2O3 were investigated. Phase compositions and morphologies of roasted products and borax were analyzed by XRD and SEM. The results indicate that the optimal processing parameters are fivefold theoretical amount of Na2CO3, molding pressure of 5 MPa, roasting temperature of 850°C and holding time of 3 h. Under these conditions, activation and alkaline hydrolysis of boron mineral are completed synchronously, which make transformation of MgBO2(OH) into soluble Na3BO3and Na2B4O7. The leaching rate of B2O3 in roasted products reaches 91.05%. Well-crystallized borax is obtained from leached filtrate after treatments of removing impurity, evaporation and concentration. © All Rights Reserved. Source


Jiang T.,Northeastern University China | Jiang T.,Liaoning Key Laboratory for Ecologically Comprehensive Utilization of Boron Resource and Materials | Wu J.,Northeastern University China | Wu J.,Liaoning Key Laboratory for Ecologically Comprehensive Utilization of Boron Resource and Materials | And 5 more authors.
Advanced Powder Technology | Year: 2012

Boron-rich blast furnace slag of low activity is one of the major products created during the separation of iron and boron from ludwigite in a blast furnace process, and the high-efficiency utilisation of its is of great importance to the Chinese boron industry. This paper proposes one new application process to synthesize α′-Sialon-AlN-BN powders by a carbothermal reduction-nitridation method using boron-rich blast furnace slag as the staring material and describes a series of experimental studies that were performed to elucidate the mechanism of phase formation and microstructure evolution during CRN. The experimental results revealed that the phase compositions and microstructures of the synthesized products were greatly affected by the initial compositions ((Ca,Mg) xSi 12-3 xAl 3xO xN 16-x), x = 0.3-1.8), temperature and holding time. With the compositions shifting from values of x of 0.3-1.8, the relative amount of α′-Sialon, AlN and BN increased gradually, and the amount of α′-Sialon reached a maximum at a value of x of 1.4. The optimal condition for powder synthesis was a temperature of 1480 °C with a holding time of 8 h, under which the crystalline phases included α′-Sialon, AlN, BN and less SiC. More elongated α′-Sialon grains were observed at higher x values and temperatures. During the CRN process, MgAl 2O 4, Mg 2SiO 4, Ca 2Al 2SiO 7, MgSiN 2, β′-Sialon and 27R appeared sequentially as intermediate products. The volatilisation of SiO gas and magnesium vapour resulted in additional weight loss of the samples, which was aggravated with increases in the synthesis temperature and holding time. © 2011 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved. Source

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