State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials

Mianyang, China

State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials

Mianyang, China
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Li T.,Sichuan University | Li T.,State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials | Liu Y.,Sichuan University | Ma G.,State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials | He D.,Mianyang Normal University
Journal Wuhan University of Technology, Materials Science Edition | Year: 2013

Nickel tartrate precursor particles were synthesized by the liquid phase precipitation method in an ethanol-water-ammonia mixed solution, with tartaric acid and using nickel chlorate as raw materials, with the pH value controlled at 4.0, and the temperature controlled at 50 C. Nickel particles with complicated morphology were prepared by the decomposition of nickel taratrate precursor particles at temperatures of 360, 380 and 400 C, respectively. The study of infrared spectroscopy (IR) indicated that the product was pure nickel tartrate. The studies of the atomic absorption spectrometry (AAS) and organic elemental analysis (OEA) indicated that the molar ratio of Ni2+ to (C 4H4O6)2- is close to 1:1. The studies of the differential scanning calorimeter and thermo-gravimetric analysis (DSC-TG) indicated that the chemical formula Ni2(C4H 4O6)2·5H2O was confirmed. The studies of X-ray diffractions (XRD) indicated that the silvery white metal powders were pure Ni, with a face-centered cubic crystal structure. The images of scanning electron microscopy (SEM) showed that the morphology of metal Ni particles was obvious spherical and radiate. The diameter of nickel tartrate particles was about 60 μm, which consisted of many nanolathes; and the diameter of metal Ni particles was about 30 μm, which consisted of many lathes about 0.5 μm in thickness. © 2013 Wuhan University of Technology and Springer-Verlag Berlin Heidelberg.


Li L.,Southwest University of Science and Technology | Li L.,State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials | Yan Y.,Southwest University of Science and Technology | Yan Y.,State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials | And 3 more authors.
Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | Year: 2015

A new fabrication process (so called two-steps method, e.g. autoclaved firstly, and then calcined) was developed. A lightweight calcium-hexaluminate/aluminium-magnesium spinel (CA6/MgAl2O4) composite ceramics was synthesized by this new process using dolomite (CaMg(CO3)2) and Al(OH)3 as raw materials. The effect of hydrothermal treatment temperature on properties of precursor, and phase composition and microstructure of lightweight composite ceramics were studied. The results showed that: hydrothermal treatment at 200 ℃, gibbsite in the precusor was translated into boehmite. The precursor is provided with high reaction activity by hydrothermal treatment and provided more space for hexaluminate growth when resolved at high temperature. The two steps method can make the sintering temperature lower over 100 ℃ than traditional process, and the CA6 crystal grows perfectly. When the dosage of dolomite is 13%, precursor through hydrothermal treatment at 200 ℃, composite ceramics which consists of CA6 and MgAl2O4 can be synthesized after calcining at 1400 ℃ for 3 h, which achieves density of 1.56 g/cm3, porosity of 61.5%, and pore-size distribution of 0.2-1.1 μm. However, the composite ceramics with the weaker diffraction peak of CA6 and uncompleted crystal appearance can only be prepared at 1500 ℃ for 3 h by the same batch without hydrothermal treatment. ©, 2015, Chinese Ceramic Society. All right reserved.


Song Y.-Z.,State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials | Song L.-X.,State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials | Lu Z.-Y.,State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials | Lu A.,State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials | And 3 more authors.
Rengong Jingti Xuebao/Journal of Synthetic Crystals | Year: 2012

In this paper, nano-silica particles were prepared by ultrasound-assisted precipitation method, and were modified by silane coupling agent KH-570. The structure and properties of silica were characterized by FTIR, TG, contact angel and TEM. The effects of content of KH-570 and modification time on activation index of silica were studied. The result showed that compared with normal stirring, ultrasound was more conducive to preparation and modification of silica. Under the ultrasound condition, KH-570 was successfully grafted to the surface of silica nano-particles. After modification, silica were rendered better hydrophobic and the dispersion significantly improved. The activation index of silica reached 100% when the content of KH-570 was 3 mL and the modification time was 1 h.


Ding Y.,State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials | Song L.-X.,State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials | Song Y.-Z.,State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials | Lu A.,State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials | And 2 more authors.
Rengong Jingti Xuebao/Journal of Synthetic Crystals | Year: 2013

In this paper, sodium silicate was used as silica source and supercritical fluid technology was carried out to prepare ultrafine SiO2 particles. The effects of pressure and temperature on the particle size and zeta potential of ultrafine SiO2 particles were studied, respectively. Zeta potential and laser particle size analyzer, X-ray diffracmeter(XRD) and automatic adsorption instrument were employed to characterize the structure and properties of ultrafine SiO2 particles. The results showed that the minimum mean diameter of silica particles is 472.9 nm and the Zeta potential is -55.68 mV when the corresponding pressure and temperature is 8 MPa and 50°C, respectively. The ultrafine SiO2 particles exhibit amorphous state and compared with the purchased T36-5 SiO2 particles, its pore structure is denser.


Song L.-X.,State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials | Song Y.-Z.,State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials | Ding Y.,State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials | Wang J.,State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials
Rengong Jingti Xuebao/Journal of Synthetic Crystals | Year: 2013

Nano-silica particles were successfully prepared by the hydrolysis and condensation of tetraethyl orthosilicate (TEOS) using ammonia as a catalyst. Effects of ammonia concentration, preparing temperature on gel time and diameter of nano-silica particles were studied. Laser particle size analyzer, automatic adsorption instrument, X-ray diffractometer (XRD) and transmission electron microscope (TEM) were carried out to characterize structure and morphology of nano-silica particles. The results show that: By controlling preparing condition, nano-silica particles with controllable diameter can be prepared; Nano-silica particles exhibit spherical structure and amorphous state, and the primary particle is 20 nm; Nano-silica particles present relatively complete pore system including microporous, mesoporous and macroporous.


Xia Y.,Southwest University of Science and Technology | Yan Y.,State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials | Hu Z.,State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials
Construction and Building Materials | Year: 2013

Circulating fluidized bed combustion (CFBC) fly ash (CFA) is an industrial waste from CFBC boiler of electric power plant, which is not a good supplementary cementitious material for Portland cement and concrete because its expansive feature results in unexpected deterioration of concrete in the last stage. The non-autoclaved aerated concrete (NAAC) was developed using the CFA as main raw materials in this study. To find out the effect of raw materials on the products properties, rheological property of fresh pastes, physical, chemical, mechanical and microstructure analyses were performed. The results show the reasonable dosage of CFA, cement, and lime were 65.5%, 22%, and 10%, respectively. Medium diameter of CFA particle size ranges from 9.6 μm to 23.9 μm is the most suitable for preparation of NAAC duo to the matching condition between thickening rate of the slurry and the reaction rate of aluminum powder and water. The principal minerals in NAAC are needlelike AFt and floccular C-S-H, be different from autoclaved aerated concrete (AAC). © 2013 Published by Elsevier Ltd.


Chen X.,State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials | Yan Y.,Southwest University of Science and Technology | Liu Y.,State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials | Hu Z.,State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials
Construction and Building Materials | Year: 2014

Circulating fluidized bed combustion (CFBC) fly ash (CFA), which has not been recycled in large scale due to its later volume expansion yet, was utilized for the preparation of foam concrete. To investigate whether a large volume of pore in the foam concrete would reduce the expansion from the CFA or reduce the shrinkage of foam concrete. A series of manufacturing parameters, such as quick lime and aluminate cement dosages, water to solid ratio (W/S), CFA fineness and type, chemical activators and so on, were investigated based on the density and compressive strength of specimens and the performances of products were also tested in this paper. The results show the most reasonable dosages of CFA, quick lime, and aluminate cement were 70%, 8%, and 2%, respectively. The addition of quicklime or/and aluminate cement could accelerate the setting and hardening rate of slurry. To improve the compressive strength, the finer CFA is better, and W/S should be reduced as low as possible. Incorporating 0.05% TEA or/and 0.5% Na2SO4 into the slurry can significantly enhance the compressive strength of the foam concrete. Encouragingly, the compressive strength, frost-resistance and thermal conductivity of products are good. © 2013 Elsevier Ltd. All rights reserved.


Li S.,State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials | Hu X.,State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials | Hu X.,University of Sichuan | Wang Y.,University of Sichuan | And 2 more authors.
Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica | Year: 2012

An intumescent flame retardant 3, 9-dichloro-2, 4, 8, 10-tetraoxa-3, 9-diphosphaspiro-[5.5] undecane-3, 9-dioxide (SPDPC)-hexamethylendiamine copolymer (PSPHD) molecules containing active end-group were grafted onto the sepiolite (SEP) surface via condensation between acryl chloride of PSPHD and hydroxyl groups existed on sepiolite surface successfully. The modified sepiolite were characterized by SEM, TEM, XPS, FTIR, XRD, TGA. SEP/LDPE and PSPHD-SEP/LDPE composites were prepared by melt blending. SEM and TEM photographs illustrate that the surface morphology of sepiolite changes rapidly. The results of XPS, FTIR and XRD show a grafting modification effect on the structure of SEP, but no destruction. The results of TGA and DTG confirm that there really exists a grafting reaction between PSPHD and SEP, the thermal degradation process of SEP change through graftion. The limiting oxygen index (LOI) test results indicate that the flame retardancy of LDPE can be improved with the addition of PSPHD-SEP or SEP, the LOI value of PSPHD-SEP /LDPE composite reaches 23 with 5% mass fraction of PSPHD-SEP.


Yang B.,Southwest University of Science and Technology | Wang L.-G.,Southwest University of Science and Technology | Yi Y.,Southwest University of Science and Technology | Yi Y.,State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials | And 2 more authors.
Wuli Xuebao/Acta Physica Sinica | Year: 2015

Based on the density functional theory, the diffusion behaviors of C, N and O atoms in V metal are studied by using the first-principles calculation method. Firstly, the site occupations of C, N and O atoms in the interstitials of the bcc V lattice are discussed. The interactions of interstitial C, N and O atoms with V lattice are analyzed, and the influence of the electronic structure on the interaction is explored. The study results show that C, N and O atoms are more stable in octahedral interstice of V metal, and a relatively strong bonding interaction is formed between their 2p-electron and the 3d-electron of V metal. The diffusion barriers of C, N and O atoms are 0.89 eV, 1.26 eV and 0.98 eV, respectively. Thus, the expressions of their diffusion coefficients are obtained. Finally, the diffusion coefficients of C, N and O atoms are compared by the Arrhenius plot. Their diffusion coefficients are calculated at 500-1100 K, and the calculation results are consistent with experimental values. © 2015 Chinese Physical Society.


Li T.,University of Sichuan | Li T.,State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials | Liu Y.,University of Sichuan | He D.,Mianyang Normal University | Ma G.,State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials
Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering | Year: 2012

Through a mild thermal precipitation and aging process, hydrated cobalt oxalate nanorods were synthesized using CoSO 3 and (NH 4) 2 C 2O 4·H 2O as raw materials at the reaction and aging temperature of 65°C. Afterwards, the metal cobalt nanofibres were prepared by decomposition of cobalt oxalate nanorods precursor in Ar gas atmosphere. The composition and morphology of products were characterized by means of atomic absorption spectrometer (AAS), organic elemental analyzer (OEA), Fourier transform infrared spectroscopy (FT-IR), thermogravimetry analysis and derivative thermogravimetry (TGA-DTG), the X-ray diffraction (XRD), and scanning electron microscope (SEM). The results demonstrate that the product is hydrated cobalt oxalate, and the chemical formula CoC 2O 4·3H 2O is confirmed. The sizes of the cobalt oxalate nanorods as-prepared are about 0.2-0.4 μm in diameter, and 1.0-5.0 μm in length; the metal nanofibres prepared via decomposition process of hydrated cobalt oxalate nanorods are about 0.2 μm in diameter, and 1.0-5.0 μm in length. Copyright © 2012, Northwest Institute for Nonferrous Metal Research. Published by Elsevier BV. All rights reserved.

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