CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Xiaorong Zhang,Zhixiao Zhang,Yuming Liu,Yanming Wang,Xiying Fu,Yongmei Bai,Guangshuo Wang,Jingbo Mu,Xiaoliang Zhang,Hongwei Che
We studied the effects of particle size of raw materials (B 4 C, TiC and Si powders) on the characteristics of both TiB 2 –SiC composite powders and ceramics. Results show that the size of B 4 C and Si particles hardly affects the size of TiB 2 and SiC particles because B 4 C is decomposed and consumed during the formation of TiB 2 , and Si is melted during the formation of SiC. The size of SiC particles is within the nano and submicron scale. However, the size of TiC particles determines the sizes of TiB 2 particles and TiB 2 grains in the composite ceramics because TiC particles serve as templates to form TiB 2 particles. Consequently, the microstructure and mechanical properties of the TiB 2 –SiC composite ceramics are affected. The TiB 2 –SiC composites fabricated using nano-sized TiC powder possess smaller grain size, better dispersibility and more reasonable crack propagation path, thereby obtaining the optimal mechanical properties (Vickers hardness of 30.2 GPa, flexural strength of 732 MPa and fracture toughness of 7.37 MPa m 1/2 ).
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DOI
高影响因子
Molecular Catalysis
·
2021
·
IF 5.062
Zhige Zhang,Guofeng Zhao,Bing Han,Jiawei Zhong,Jun Xie
Sustainable transformation of methane into methanol feedstock syngas is a promising direction in future energy generation. A monolithic SiC-foam (SiC-foam, denoted as SCf) supported structured Ni-SrO composite nanomaterial was prepared via reducing the SrNiO 3 perovskite. The Ni-SrO/SCf displays a stronger resistance to Ni-sintering/coke-deposition than the unmodified Ni/SCf due to its uniform Ni distribution as well as the strong Ni-SrO interaction. In the presence of Ni-SrO/SCf sample at a gas hourly space velocity (GHSV) of 24,000 mL CH4 CO2 g Cat −1 h − 1 and an operating temperature of 850 °C, the initial conversion rate of biogas (CH 4 /CO 2 ) was 70/94%, which gradually dropped to 55/72% within 40 h, but its activity remained stable for the next 60 h. By contrast, the conversion rate of biogas (CH 4 /CO 2 ) in the presence of Ni/SCf sample was decreased rapidly from 60/80 to 50/65% within 20 h, due to the severe coke deposition and Ni-sintering.
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高影响因子
Materials Research Express
·
2021
·Vol. 8
·期 3
·035501
·
IF 1.62
Chao Li,Guodong Zeng,Min Zhou,Yang Fang,Zongwu Chen,Yishen Xu,Siyin Ding,Miao Yuan,Hao Li,Shaopeng Wu
Combination of styrene-butadiene-styrene (SBS) polymer and layered double hydroxides (LDHs) has commonly applied in asphalt to improve anti-ultraviolet aging performance, but it can not afford the reparation of cracks caused by aging of asphalt. Also, few researches focused on the structure and performance changes during synthesis of LDHs. Based on self-healing performance of asphalt, the produced cracks can be repaired by microwave heating. Therefore, the controllable synthesis of traditional microwave absorber SiC to wrap LDHs (SwL) at different temperatures was studied in this paper, and the effects of different SBS/SwL combination on the microwave absorption and exothermic properties of modified asphalt were studied. The SwL was firstly synthesized at 200 °C, 350 °C, 500 °C and 650 °C. Then morphology, phase composition, chemical structure of different SwL were evaluated. Finally, based on different combination of SBS and SwL, the effects of SBS/SwL on the microwave absorption in the frequency band from 1 GHz to 18 GHz and exothermic characteristics at 2.45 GHz of the modified asphalt were analyzed. The results show that SwL can be synthesized successfully, and the processing temperature significantly affects the structure of SwL. The SBS/SwL-200 modified asphalt has the best microwave absorption and exothermic properties. When used in self-healing asphalt, it is more advantageous to choose 200 °C as the synthesis temperature of SwL.
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高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Luyan Yao,Changming Ke,Jinhua Zhang,Yuanbing Li,Bingqiang Han,Jingran Wang
Ti–Si–Fe alloys extracted from high-titanium blast furnace slag were utilized to replace part of the silicon powders, and then nitride/oxynitride bonded SiC ceramics were prepared by reactive sintering in graphite bed. Ti–Si–Fe alloys could react with CO/N 2 at a low temperature (1200 °C), and the addition of Ti–Si–Fe alloys could reduce the nitriding temperature of Si. Density functional theory calculations suggested that Ti–Si–Fe alloys enhanced reaction activity via weakening the strength of C O and N N bonds. The regional equilibrium phase diagrams of Si–C–N–O and Ti–Si–C–N–O under CO/N 2 atmosphere were calculated by thermodynamics. The change of whiskers morphology was observed by scanning electron microscope. Furthermore, the bulk density, the cold modulus of rupture, and the cold compressive strength improved with Ti–Si–Fe alloys content. The results showed that the addition of Ti–Si–Fe alloys not only significantly promoted nitriding of Si and formation of Si 3 N 4 whiskers, but also improved the mechanical properties of the samples.
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高影响因子
Advanced Membranes
·
2025
·
IF 9.5
Junyou Li,Qilin Gu,Huiqin Zhang,Zhaoxiang Zhong,Yiqun Fan,Weihong Xing
Porous SiC membranes prepared through the reaction sintering between the additive and surface oxidation generated silica have gained increasing attention in the fields of oil-water separation. Previous efforts mainly focused on the types and contents of additives incorporated by physically mixing process, while their distribution on the microstructure and separation performance of SiC membranes has been rarely involved. This work proposed to prepare SiC membranes by uniformly coating AlOOH sol on SiC particles via the electrostatic interaction and the subsequent reaction sintering of the derived SiC@alumina core-shell particles. It is found that the surface coating enabled the homogeneous dispersion of the additives in SiC powder matrix, which not only facilitated the reactive sintering process and notably reduced the amount of residual SiO 2 in SiC membranes, but also homogenized the pore structure. Also, the oxidation pathway of SiC had been altered, which substantially retarded the oxidation degree. Impressively, the as-prepared SiC membranes exhibited 20% improvement in alkali resistance, and enhanced oil-in-water emulsion separation efficiency when compared with those prepared by the conventional mechanical mixing method. Besides, the fouled SiC membranes prepared from the core-shell units can be more efficiently regenerated by using the emerging Joule heating technique. The present work provides a facile and effective pathway to the preparation of high-performance SiC membranes through the reaction sintering of rationally designed core-shell particles for high-efficient separation.
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Huan Guo,Bingzhu Wang,Ruifeng Li,Hongrui Wang,Jixiang Dai,Yong She,Yongzhong Zhao,Jianjun Sha
In order to elucidate the synergistic mechanism of boride and carbide phase in ultrahigh-temperature ceramics (UHTCs) under ablation condition, in this work, the ablation behaviour of (Hf, Ta)B 2 -(Hf, Ta)C-SiC ceramics with different (Hf, Ta)B 2 to (Hf, Ta)C molar ratios was systematically investigated by oxygen-acetylene test under a heat flux of 3.2 MW/m 2 . It was found that the oxides generated from (Hf, Ta)B 2 and (Hf, Ta)C enhanced the matching capacity of oxides with different melting points, being formed a dense ablation layer. When the molar ratio of (Hf, Ta)B 2 to (Hf, Ta)C was 2:1, the ceramic achieved a near-zero ablation rate (0.042 μm/s), which was 1.62 times lower than that of (Hf, Ta)C-SiC ceramics. The mechanism for the enhanced ablation resistance was attributed to the Hf 6 Ta 2 O 17 generated during the ablation reaction, which reduced the viscosity of the ablation products and infiltrated into the pores of ceramics. The formation of such ablation layer could inhibit the impregnation of oxygen and the depletion of easily volatile oxides, including SiO 2 and B 2 O 3 , being formed a multi-element composite ablation layer with self-healing ability, which was helpful for the protection of the substrate from continuous oxidation damage.
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高影响因子
MATERIALS CHARACTERIZATION
·
2026
·
IF 6.2
Yuexing Chen,Xiang Ji,Chengshan Ji,Zhichao Shang,Tianyu Liu,Xuanru Ren,Jiaqi Zhu
In situ SiO 2 shells pre-establish oxygen-barrier networks in ZrB 2 -SiC coatings. • Core-shell ZrB 2 @SiO 2 improves interfacial continuity and particle packing. • Pre-positioned SiO 2 accelerates early-stage oxygen-barrier formation. • ZrO 2 and ZrSiO 4 dispersoids stabilize the borosilicate glass matrix. • ZrB 2 @SiO 2 -SiC lowers mass gain by 69% and gives 99.82% protection. Conventional ZrB 2 -based coatings rely on amorphous phases generated during oxidation to seal coating defects, which delays the establishment of an effective oxygen barrier. Here, an amorphous SiO 2 shell was constructed in situ on ZrB 2 particles through a sol-gel process, and the resulting core-shell powders were combined with SiC to prepare ZrB 2 @SiO 2 -SiC coatings. SiO 2 -free ZrB 2 -SiC and mechanically mixed ZrB 2 -SiO 2 -SiC were used as reference systems to distinguish the effect of SiO 2 incorporation from that of the core-shell configuration. Compared with the mechanically mixed system, the shell-derived phase became interconnected along ZrB 2 particle boundaries during sintering, improving interfacial continuity and suppressing particle agglomeration. During oxidation, this pre-connected SiO 2 phase combined with B 2 O 3 and SiO 2 generated by the oxidation of ZrB 2 and SiC, respectively, to promote the rapid formation and subsequent replenishment of a borosilicate glass network, while dispersed ZrO 2 and ZrSiO 4 helped preserve the continuity and structural stability of the resulting oxide scale. At 1973 K, this structure reduced the maximum mass gain to 0.62 × 10 −2 g·cm −2 , about 69% lower than that of the SiO 2 -free ZrB 2 -SiC system, and decreased the initial oxygen permeability by 83.23%, with the protection efficiency ultimately reaching 99.82%. This work provides an interface pre-encapsulation route for constructing continuous oxygen-barrier networks in ultra-high-temperature ceramic coatings.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2026
·Vol. 65
·期 28
·14910-14919
·
IF 3.9
Yang Qiqi,Hu Minglv,Zhang Wenkang,Zhou Ke,Liang Zheng,Gu Qilin,Zhong Zhaoxiang,Xing Weihong
Janus
ceramic membranes with asymmetric wettability have
proven
highly effective for preparing water-in-diesel (W/D) emulsions. Therefore,
the fabrication of such tubular membranes for continuous emulsification
processes is of significant interest. In this study, tetraethyl orthosilicate
(TEOS) and methyltriethoxysilane (MTES) were used as precursors, with
ammonia serving as the catalyst, to achieve the controlled synthesis
of hydrophobic silica (SiO 2 ) particles. Subsequently, these
hydrophobic SiO 2 particles were coated onto the inner walls
of tubular silicon carbide (SiC) membranes (mean pore size = 1.2 μm)
via a simple dip-coating process. Results indicate that controlling
the ammonia concentration allows for the synthesis of SiO 2 particles with sizes that appropriately match the pore dimensions
of the tubular SiC membranes. As the SiO 2 solid content
was increased from 0.10 to 2.00 wt %, the average pore size of the
tubular SiC membranes decreased from 1.2 to 0.52 μm. Concurrently,
the apparent water contact angle on the inner walls increased significantly
from 15 ° to 142 ° , while the outer surface remained hydrophilic.
Among the membranes with various surface wettability, the configuration
featuring a hydrophobic inner wall and a hydrophilic outer surface
proved most effective for emulsion production, yielding W/D emulsions
with smaller average droplet diameter and uniform size distribution.
This work introduces an effective method for simultaneously tuning
the surface wettability and pore structure of tubular SiC ceramic
membranes, thereby establishing a foundation for the continuous membrane
emulsification of diesel fuel.
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DOI
高影响因子
Materials Today Communications
·
2026
·
IF 4.9
Ya Chen,Haozhe Pang,Shimao Shangguan,Wuxin Yang,Jianfeng Zhao,Sarat Singamneni,Zongjun Tian
A Ni-SiC composite coating was effectively synthesized on a stainless-steel substrate through a jet electrodeposition technique integrated with a magnetic field, and then utilized for oil/water separation. Guided by an external magnetic field, the magnetically responsive nickel components loaded with hydrophilic SiC were incorporated into the coating, creating a coral-like micro-nano hierarchical rough structure. The functionalized mesh demonstrated remarkable superhydrophilic properties and submerged low-adhesion superoleophobicity. Appropriate processing parameters were identified by analyzing how electrodeposition duration and voltage influence the surface topography as well as the wettability associated with the Ni-SiC-coated mesh. The results indicated that the Ni-SiC-coated mesh prepared at 30 V for 10 min exhibited a WCA of 0° and a UOCA of 152.2°. Ni-SiC-coated meshes fabricated at a lower voltage required a deposition time of 30 min to achieve superhydrophilicity and underwater superoleophobicity. The mesh achieved high efficiency along with superior purification levels for various oil/water emulsions and sustained a stable separation performance (exceeding 95%) after 50 cycles. The treated substrate maintained its functionality in aggressive media. In natural conditions, the Ni-SiC-coated mesh still retained its outstanding superhydrophilicity and underwater superoleophobicity after three months of storage. In addition, the Ni-SiC-coated mesh maintained a UOCA of more than 150° after water erosion for 10 h.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Qi Song,Zhao-Hui Zhang,Zheng-Yang Hu,Shi-Pan Yin,Hao Wang,Xian-Yu Li,Xing-Wang Cheng
B 4 C is a structural ceramic , which is very sensitive to cracks and flaws. The present study aims to improve its mechanical performance using pre-oxidation process. The monolithic B 4 C ceramic and TiB 2 -SiC/B 4 C (B 4 C-TSC) composite ceramic were fabricated using spark plasma sintering technique, and they were pre-oxidized at 800 °C in the air. The effect of pre-oxidation time on microstructure and flexural strength was systematically investigated. The results indicated that 30 min was the optimum pre-oxidation time for both B 4 C ceramic and B 4 C-TSC ceramic. At this pre-oxidation time, the maximum flexural strength of 601.5 and 785.2 MPa were obtained for B 4 C ceramic and B 4 C-TSC ceramic, respectively. The improved flexural strength was primarily ascribed to the formation of glassy oxide layer during the pre-oxidation process and, in turn, the crack healing effect on the surface of the ceramics. Further increasing pre-oxidation time reduced flexural strength due to the pore formation induced by a large amount of CO gas and an intensive evaporation of B 2 O 3 glass phase.
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高影响因子
GIANT
·
2023
·
IF 7
Xin Xu,Hongli Hu,Hangyu Zhong,LinGe Wang,Bo-xing Zhang
In recent decades, the sol-gel process accompanied with phase separation has been employed to fabricate porous monolithic ceramic materials. However, it is challenging to obtain crack-free samples by using this method, due to the fragile nature of porous ceramic materials and the large internal stress generated from drying and calcination process. In this work, tough monolithic titania (TiO 2 ) materials were fabricated by the sol-gel process accompanied with phase separation in solutions of silicon carbide (SiC) nanofibers and preceramic polymers. It was found that polyethylene oxide (PEO) and ethylenediamine (EDA) can promote phase separation and sol-gel process respectively, and the micro-morphology of porous monolithic TiO 2 materials can be flexibly tuned by adjusting the contents of PEO and EDA. The addition of SiC nanofibers effectively enhanced the mechanical performance and photocatalytic activity of porous TiO 2 materials without altering their bicontinuous micro-morphology. Taking TiO 2 materials as an example, this work demonstrates a novel methodology to fabricate ceramic nanofibers reinforced porous monolithic ceramic materials.
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高影响因子
Coatings
·
2023
·Vol. 13
·期 2
·422
·
IF 3.4
Haoyang Ni,Haiwei Fu,Hongbiao Wang,Hongwen Zhang,Yifan Zhu,Xiuqing Fu
This study aimed to improve the surface hardness and wear resistance of spindle hook teeth with special shapes to reduce the cost of replacing the spindle on cotton pickers. For this goal, a Ni-Co-β-SiC composite coating with different concentrations of β-SiC nanoparticles (0, 1, 2, 3, and 4 g/L) was electrodeposited on the surface of spindle hook teeth. The hardness, elemental composition, and micromorphology of the spindle hook teeth were characterized by microhardness tests, an energy spectrum analyzer, and a scanning electron microscope after cutting with the spindles. The actual wear process of the coating was determined by wear simulation and scratch wear tests, and the effect of the concentration of β-SiC nanoparticles on the properties of the coating was investigated. The results show that Ni-Co-β-SiC composite coating has a typical cellular structure. The hardness first increases and then decreases, and the wear resistance (including friction coefficient, scratch area, and shape of wear area) first decreases and then increases, mainly due to the pinning role and agglomeration of β-SiC nanoparticles. When the concentration of β-SiC was 1 g/L, the hardness reached a maximum of 506.2 HV0.1, the coefficient of friction reached a minimum of 0.13, and the wear area and wear micromorphology reached the most suitable values. Therefore, this Ni-Co-β-SiC composite coating had the best microhardness and wear resistance.Keywords:spindle hook teeth;β-SiC nanoparticles;Ni-Co-β-SiC composite coatings;wear;microhardness;electrodeposition
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高影响因子
危险品化学品经营许可证（带存储）