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Mesoporous fibrous silicon nitride by catalytic nitridation of silicon
Publication date: Available online 10 April 2019Source: Progress in Natural Science: Materials InternationalAuthor(s): Tatevik Minasyan, Le Liu, Marina Aghayan, Miguel A. Rodriguez, Sofiya Aydinyan, Irina HussainovaAbstractThe catalytic effect of metal oxide/alumina whiskers (CeO2, Mn3O4, NiO, Co3O4, Fe2O3, Cr2O3/AW) was evaluated on their ability to drive the nitridation of silicon and to generate mesoporous fibrous silicon networks. Silicon powder with different particles size along with the catalyst was nitridized at 1300 °C for 5 h in nitrogen and nitrogen diluted with 10 vol% ammonia atmospheres. Nitridation de...
Source: Progress in Natural Science: Materials International - April 11, 2019 Category: Materials Science Source Type: research

Solar-driven high-temperature steam generation at ambient pressure
Publication date: Available online 18 March 2019Source: Progress in Natural Science: Materials InternationalAuthor(s): Xinyu Wang, Yanming Liu, Rui Feng, Yao Zhang, Chao Chang, Benwei Fu, Tian Luan, Peng Tao, Wen Shang, Jianbo Wu, Chengyi Song, Tao DengAbstractThis paper demonstrates a facile solar steam generator for the generation of high-temperature steam at ambient pressure. The steam generator consists of a coiled copper tube (CCT) that serves as both solar collector and vapor heater. Both the inner and outer surfaces of the CCT are coated with black superhydrophobic copper oxide layer to improve the solar absorption,...
Source: Progress in Natural Science: Materials International - March 20, 2019 Category: Materials Science Source Type: research

Microstructure and texture evolution of a near β titanium alloy Ti-7333 during continuous cooling hot deformation
Publication date: Available online 6 March 2019Source: Progress in Natural Science: Materials InternationalAuthor(s): Jiahao Chen, Jinshan Li, Bin Tang, Yi Chen, Hongchao KouAbstractThe microstructure and texture evolution during continuous cooling hot deformation (CCHD) in a near β titanium alloy, named Ti-7Mo-3Nb-3Cr-3Al (Ti-7333), were investigated by using the electron backscattered diffraction (EBSD). The results indicate that the precipitation of secondary α phase was restricted by CCHD, and the morphology of primary α phase nearly had no change with the deformation and temperature drop. In contrast, β phase unde...
Source: Progress in Natural Science: Materials International - March 7, 2019 Category: Materials Science Source Type: research

Fusion boundary evolution, precipitation behaviour, and interaction with dislocations in an Fe–22Cr–15Ni steel weldment during long-term creep
Publication date: Available online 7 March 2019Source: Progress in Natural Science: Materials InternationalAuthor(s): Yu Zhang, Hongyang Jing, Lianyong Xu, Yongdian Han, Lei Zhao, Xishan Xie, Zhengxin TangAbstractA tungsten inert gas welded joint between a novel heat-resistant austenitic steel and ERNiCrCoMo-1 weld metal was investigated before and after creep in this study. The evolution of the microstructures in the base and weld metals was discussed based on the electron back-scatter diffraction (EBSD) and transmission electron microscopy (TEM) analyses. The preferred orientations of the fusion boundary after creep reve...
Source: Progress in Natural Science: Materials International - March 7, 2019 Category: Materials Science Source Type: research

The effect of Al and Cr elements on the oxidation resistance of MoSi2 via first-principles calculation
Publication date: Available online 22 February 2019Source: Progress in Natural Science: Materials InternationalAuthor(s): Liwu Jiang, Meiling Wu, Peng Shi, Chuanhui ZhangAbstractThe properties of structure, energy and oxidation resistance of interstitial and substitutable MoSi2 systems have been investigated using the density functional theory. The calculated lattice constants for pristine MoSi2 confirm the early experimental results. In the interstitial MoSi2, the impurity energy of O atom was computed for the stable interstitial site in the systems. The results reveal that the O atom prefers to occupy the Oct2 site with ...
Source: Progress in Natural Science: Materials International - February 23, 2019 Category: Materials Science Source Type: research

CoPt-Co hybrid supported on amino modified SiO2 nanospheres as a high performance catalyst for hydrogen generation from ammonia borane
Publication date: Available online 21 February 2019Source: Progress in Natural Science: Materials InternationalAuthor(s): Hongming Zhang, Dandan Ke, Lina Cheng, Xuelei Feng, Xuewei Hou, Jin Wang, Yuan Li, Shumin HanAbstractCoPt-Co hybrids were successfully supported on amino modified SiO2 nanospheres by a chemical reduction method at a temperature of 278 K. The solid carrier i.e. amino modified SiO2, provides numerous anchoring sites for the metal nanoparticles (NPs) to improve the dispersion while reducing the size of metal NPs. The supported NPs displayed a narrow particle size distribution on the SiO2 surface with an ...
Source: Progress in Natural Science: Materials International - February 23, 2019 Category: Materials Science Source Type: research

Adjustable thermal expansion in La(Fe, Si)13-based conductive composites by high-pressure synthesis
Publication date: Available online 19 February 2019Source: Progress in Natural Science: Materials InternationalAuthor(s): Wei Wang, Rongjin Huang, Yi Shan, Yuqiang Zhao, Xinran Shan, Shibin Guo, Chuanjun Huang, Laifeng LiAbstractProviding a suitable contact interface, where a high conductivity material with a desirable coefficient of thermal expansion (CTE) adjoins the target micro-electric devices, is very crucial to optimize the properties and service life of the relevant instruments. Regrettably, a high conductivity, low thermal expansion and relatively inexpensive material is very rare. Composites, fortunately, can off...
Source: Progress in Natural Science: Materials International - February 20, 2019 Category: Materials Science Source Type: research

Synthesis and graphitization of resole resins by ferrocene
Publication date: Available online 15 February 2019Source: Progress in Natural Science: Materials InternationalAuthor(s): S.I. Talabi, A.P. Luz, V.C. Pandolfelli, J.S. Bernardes, A.A. LucasAbstractCommercial (Rs) and laboratory synthesized resoles (LSRs) containing 3–5 wt% ferrocene have been used to study the development of thermosetting resin compositions as binder materials for carbon-containing refractories (CCRs) production. The LSRs were developed based on formaldehyde to phenol 1.5 mol.% (1.5Rs) and 2.0 mol.% (2Rs). Microstructure and oxidation resistance of carbons derived from plain and modified resins hav...
Source: Progress in Natural Science: Materials International - February 16, 2019 Category: Materials Science Source Type: research

Numerical modeling of annular electromagnetic stirring with intercooling in direct chill casting of 7005 aluminum alloy billet
Publication date: Available online 14 February 2019Source: Progress in Natural Science: Materials InternationalAuthor(s): Yajun Luo, Zhifeng ZhangAbstractUniform direct chill (UDC) casting method was developed by combining annular electromagnetic stirring (A-EMS) with intercooling in direct chill casting. In order to investigate effect of UDC on flow patterns, temperature profiles and solidification during the casting, a numerical model of the UDC casting process was developed and used to simulate the UDC casting process for preparing 7005 aluminum alloy billets. The comparison of the calculated results of UDC casting with...
Source: Progress in Natural Science: Materials International - February 15, 2019 Category: Materials Science Source Type: research

Effects of Cr and Mo elements on the microstructures and compressive properties of the in situ (TiCxNy–TiB2)/Ni cermets
Publication date: Available online 14 February 2019Source: Progress in Natural Science: Materials InternationalAuthor(s): Fang Chang, Feng Qiu, Chuanlu Li, Yawei Wang, Qichuan JiangAbstractIn-situ (TiCxNy–TiB2)/Ni cermets with 70 wt% TiCxNy–TiB2 were successfully fabricated by combustion synthesis and hot pressing sintering in Ni-Ti-B4C-BN powder systems. The microstructures, density, compressive properties, and hardness of the TiCxNy–TiB2/Ni cermets with the addition of 0–8 wt% Cr/Mo to the Ni-Ti-B4C-BN powder systems were compared and analysed. The results showed that the ceramic particles distributed uniform...
Source: Progress in Natural Science: Materials International - February 15, 2019 Category: Materials Science Source Type: research

Effect of sintering temperature on phase evolution of Al86Ni6Y4.5Co2La1.5 bulk amorphous composites synthesized via mechanical alloying and spark plasma sintering
Publication date: Available online 14 February 2019Source: Progress in Natural Science: Materials InternationalAuthor(s): Ashutosh Sahu, Ram Sajeevan Maurya, Tapas LahaAbstractAl86Ni6Y4.5Co2La1.5 amorphous powders were synthesized by mechanical alloying for 200 h. Subsequent consolidation was performed via spark plasma sintering in the temperature range of 250 °C to 500 °C at the pressure of 500 MPa. The role of viscous flow on densification was investigated by studying the viscosity change of the amorphous phase at different consolidation temperatures. The decrease in viscosity at higher sintering temperatures r...
Source: Progress in Natural Science: Materials International - February 15, 2019 Category: Materials Science Source Type: research

Microstructure of ultrahigh carbon martensite
Publication date: Available online 7 December 2018Source: Progress in Natural Science: Materials InternationalAuthor(s): Chao Wang, Yulin Chen, Jingyun Han, Dehai Ping, Xinqing ZhaoAbstractRecent experimental investigations suggest that the martensite formed by quenching carbon steels (0.2–1.26 mass %C) are composed of twins and nanoscale ω particles in twin boundaries, rather than carbon supersaturated uniform solutions. In order to probe the microstructure of the martensite with ultrahigh carbon content, a novel strategy is employed in the present study to obtain ultrahigh carbon martensite (approximate 2.1 mass %C) b...
Source: Progress in Natural Science: Materials International - December 8, 2018 Category: Materials Science Source Type: research

Carboxyl-modified hierarchical wrinkled mesoporous silica supported TiO2 nanocomposite particles with excellent photocatalytic performances
Publication date: Available online 7 December 2018Source: Progress in Natural Science: Materials InternationalAuthor(s): Xuejuan Wan, Haoqi Ke, Guanghui Yang, Jiaoning TangAbstractTitanium dioxide (TiO2) is a common photocatalyst for organic pollutants degradation. However, in practical application, the poor adsorption capacity of pure TiO2 seriously impeded its efficiency in the degradation of organic molecules. In this work, a series of hierarchical wrinkle mesoporous silica supported TiO2 nano-composite particles (TiO2 @WMS-COOH) were successfully prepared. Thanks to their high surface areas, large pore volumes and meso...
Source: Progress in Natural Science: Materials International - December 8, 2018 Category: Materials Science Source Type: research

Influence of operational parameters on the photocatalytic performance of DE-NOx process Via MIL-101(Fe)
Publication date: Available online 5 December 2018Source: Progress in Natural Science: Materials InternationalAuthor(s): Hoang Phuc Nguyen, Tae Ho Kim, Soo Wohn LeeAbstractMetal organic framework (MOF) has been paid great attention as a potential candidate for various applications in the field of energy and environment, particularly in air purification. Among various MOFs, MIL-101(Fe) represents an interesting material possessing many advantages, including the ease of fabrication, high porosity, high specific surface area with open metal sites, making it a promising material in the field of harmful gas treatment. Taking th...
Source: Progress in Natural Science: Materials International - December 6, 2018 Category: Materials Science Source Type: research

Temperature effect and thermal impact in lithium-ion batteries: A review
Publication date: Available online 28 November 2018Source: Progress in Natural Science: Materials InternationalAuthor(s): Shuai Ma, Modi Jiang, Peng Tao, Chengyi Song, Jianbo Wu, Jun Wang, Tao Deng, Wen ShangAbstractLithium-ion batteries, with high energy density (up to 705 Wh/L) and power density (up to 10,000 W/L), exhibit high capacity and great working performance. As rechargeable batteries, lithium-ion batteries serve as power sources in various application systems. Temperature, as a critical factor, significantly impacts on the performance of lithium-ion batteries and also limits the application of lithium-ion ba...
Source: Progress in Natural Science: Materials International - November 29, 2018 Category: Materials Science Source Type: research