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Featured researches published by Weibing Zhou.


Transactions of Nonferrous Metals Society of China | 2007

Synthesis of Ti2AlC by hot pressing and its mechanical and electrical properties

Ping Wang; Bingchu Mei; Xiaolin Hong; Weibing Zhou

Abstract Ti2AlC bulk material was synthesized by hot pressing of mixture powders of TiC, Ti, Al and active carbon. The phase compositions of resultant product at different temperature were detected by X-ray diffractometer. The microstructures of the samples were observed by SEM. Finally, the mechanical properties and thermal properties of the sample at 1400 °C were measured. The results show that high purity Ti2AlC material with little Ti3AlC2 can be synthesized by hot pressing 0.5TiC/1.5Ti/1.0A1/0.5C at 1400 °C. Ti2AlC exhibits high mechanical properties and metallic electrical properties. Its fracture toughness is 7.0 MPa·m½, its flexural strength is 384 MPa at room temperature, and its electrical conductivity is 2.56 × 106 Ω−1·m−1 at room temperature.


Materials Science-poland | 2014

Fabrication of highly-transparent Er:CaF2 ceramics by hot-pressing technique

Weibing Zhou; F. F. Cai; Guanglin Zhi; Bingchu Mei

Highly-transparent trivalent erbium ion doped calcium fluoride (5 mol % Er:CaF2) ceramics were fabricated by a hotpressing (HP) method using high-purity Er:CaF2 nanoparticles, which were synthesized by co-precipitation method. The mean grain size of the nanoparticles was about 24.7 nm. The nanoparticles were sintered at 600 °C, 700 °C, 800 °C and 900 °C, respectively, for 30 min under a uniaxial pressure of 30 MPa and vacuum of 10−3 Pa with 1 mol % lithium fluoride (LiF) as sintering additive. The 5 mol % Er:CaF2 ceramics sintered at 800 °C exhibits high density and pore-free microstructure with an average grain size of about 8 μm. The optical transmittance of the transparent ceramics is close to 85 % at visible and nearinfrared wavelengths. The strong and broad absorptions peaks corresponding to characteristic absorption of trivalent erbium ions make the ceramics a potential candidate for infrared and upconversion laser operating.


Journal of Wuhan University of Technology-materials Science Edition | 2012

Effect of phosphorus and fluorine on hydration process of tricalcium silicate and tricalcium aluminate

Chengzhou Guo; Jiaoqun Zhu; Weibing Zhou; Zheng Sun; Wei Chen

By means of hydration heat, XRD and SEM, effect of phosphorus and fluorine (P2O5 and F−) in phosphorous slag on hydration process of tricalcium silicate (C3S) and tricalcium aluminate (C3A) was explored. The results indicated that the early hydration exothermic rate of C3S and C3A was obviously lowered by P2O5 and F− in phosphorous slag, the second peak occurring time of C3A was delayed by 0.9 h, the exothermal output of C3S was reduced by 25.04% and the time of accelerating stage was postponed by 0.86 h. The early hydration degree of C3S and C3A was also decreased. Due to the infl uence of P2O5 and F−, more pores and thinner crystals can be observed in the microstructure of hardened paste and the chance of cracks was reduced.


Journal of Wuhan University of Technology-materials Science Edition | 2016

Numerical simulation on heat transfer enhancement of phase change thermal storage devices for low-middle temperature

Zheng Sun; Jiaoqun Zhu; Weibing Zhou; Xiaomin Cheng; Jinrong Zhu

Using Ba(OH)2·8H2O as phase change material (PCM) and water as heat transfer fluid (HTF), we numerically simulated annular finned-tube heat exchangers. In order to measure and analyze the impact of parameters in the heating/cooling process, temperature changes of different monitoring points, fin widths, and fin pitches as key parameters were considered and applied. The experimental results show that the heat exchange process can be divided into three stages within a certain time. The faster heat transfer rate is associated with the greater temperature difference between PCM and HTF. Furthermore, fins width and pitch affect dramatically the heat charging/discharging rate. The large fins width or small fins pitch is beneficial for extending the heat exchange surface, leading to improve heat transfer efficiency.


Journal of Wuhan University of Technology-materials Science Edition | 2018

Microstructure and Characterization of Capric-stearic Acid/Modified Expanded Vermiculite Thermal Storage Composites

Fengli Liu; Jiaoqun Zhu; Junhua Liu; Baoguo Ma; Weibing Zhou; Ruguang Li; Weigao Qin

In order to improve the thermal storage capacity of expanded vermiculite (EV) based form-stable composite PCM (FS-PCM) via organic modification of EV, first, EV was modified with a sodium stearate (NaSt) as surface modifier, and organic EV (OEV) with hydrophobicity and higher adsorption capacity for fatty acid was obtained. A novel capric-stearic acid eutectic (CA-SA)/OEV FS-PCM with high thermal storage capacity was then developed. OEV and CA-SA/OEV were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), thermal gravimetry (TG), and thermal cycling test. Results showed that OEV has obvious hydrophobicity and a higher adsorption capacity for fatty acid. Its adsorption ratio has increased by 48.71% compared with that of EV. CA-SA/OEV possesses high thermal storage density (112.52 J/g), suitable melting temperature (20.49 °C), good chemical compatibility, excellent thermal stability and reliability, indicating great application potential for building energy efficiency. Moreover, organic modification of inorganic matrix may offer novel options for improving its adsorption capacity for organic PCMs and increasing heat storage capacity of corresponding FS-PCMs.


Advances in Applied Ceramics | 2018

In situ synthesis, mechanical and cyclic oxidation properties of Ti3AlC2/Al2O3 composites

Weibing Zhou; Kang Li; Jiaoqun Zhu; Ruguang Li

ABSTRACT Ti3AlC2/Al2O3 composite materials were successfully fabricated from TiO2/TiC/Ti/Al powders by the in situ reactive hot pressed technique. The microstructure, mechanical and oxidation properties of the composites were investigated in the paper. Vickers hardness increased with the Al2O3 content. The relative density of Ti3AlC2/Al2O3 composites exhibits a declining tendency with Al2O3 content especially exceeds 10 vol. %. The Ti3AlC2/Al2O3 composites show excellent electrical conductivity. The flexural strength and fracture toughness of Ti3AlC2/10 vol. % Al2O3 are 461 ± 20 MPa and 6.2 ± 0.2 MPa m1/2, respectively. The cyclic oxidation behaviour of resistance of Ti3AlC2/10 vol. % Al2O3 composites at 800–1000°C generally obeys a parabolic law. The oxide scale of sample consists of a mass of α-Al2O3 and TiO2, forming a dense and adhesive protect layer. The result indicates that the Al2O3 can greatly improve the oxidation resistance of Ti3AlC2.


Journal of Wuhan University of Technology-materials Science Edition | 2017

Thermal characterization of lauric acid and stearic acid binary eutectic mixture in latent heat thermal storage systems with tube and fins

Lei Ding; Lixiong Wang; Kokogiannakis Georgios; Yajun Lü; Weibing Zhou

In order to obtain the suitable phase change material (PCM) with low phase change temperature and improve its heat transfer rate, experimental investigation was conducted. Firstly, different mass ratios of lauric acid (LA) and stearic acid(SA) eutectic mixtures were prepared and characterized by differential scanning calorimetry (DSC). Then, the performance of eutectic mixture during charging process under different fin widths in vertical condition, and performance during charging and discharging processes under different inlet temperature heat transfer fluid (HTF) in horizontal condition were investigated, respectively. The results revealed that the LA-SA eutectic mixture had the suitable phase change temperature and desired latent heat for low-temperature water floor heating system. Wide fins and high inlet temperature HTF significantly enhanced the transfer rate and decreased the melting time.


Materials Letters | 2005

Rapid synthesis of Ti2AlC by spark plasma sintering technique

Weibing Zhou; Bingchu Mei; Jiaoqun Zhu; Xiaolin Hong


Materials Letters | 2005

Fabrication of high-purity ternary carbide Ti3SiC2 by spark plasma sintering technique

Weibing Zhou; Bingchu Mei; Jiaoqun Zhu


Journal of Materials Science | 2005

Synthesis of high-purity Ti3SiC2 and Ti3AlC2 by spark plasma sintering (SPS) technique

Weibing Zhou; Bingchu Mei; Jiaoqun Zhu; Xiaolin Hong

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Jiaoqun Zhu

Wuhan University of Technology

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Bingchu Mei

Wuhan University of Technology

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Xiaolin Hong

Wuhan University of Technology

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Fengli Liu

Wuhan University of Technology

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Kang Li

Wuhan University of Technology

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Ruguang Li

Wuhan University of Technology

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Chengzhou Guo

Wuhan University of Technology

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Guanglin Zhi

Wuhan University of Technology

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Ping Wang

Wuhan University of Technology

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Shouqin Tian

Wuhan University of Technology

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