Journal of Materials Research and Technology-JMR&T
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2024
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IF 6.2
Shuxin You,Shilong Xing,Chuanhai Jiang
The synergistic mechanism of microparticles and nanoparticles on optimizing microstructures homogeneity and enhancing microhardness and corrosion resistance of mixed coatings was deeply researched by co-electrodepositing CeO 2 microparticles and CeO 2 nanoparticles into nickel matrix. Microparticles contribute to enhancing the microhardness of the coating, while nanoparticles promote the homogeneity of the microstructure, thereby improving the corrosion resistance of the coating. Therefore, by co-electrodepositing microparticles and nanoparticles into the nickel matrix, microparticles and nanoparticles in the nickel matrix generate a synergistic optimization effect, combining the advantages of microparticles and nanoparticles. Microparticles are mainly responsible for enhancing the microhardness of the coating, while nanoparticles are responsible for promoting the homogeneity of the microstructure in the coating, maintaining a homogeneous distribution of microhardness, and improving the corrosion resistance of the coating. Ultimately, the mixed coating achieves both high microhardness and excellent corrosion resistance, along with homogeneous microhardness distribution.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Siwen Cui,Yufei Ge,Shuailing Ma,Xiaoqi Zhang,Min Lian,Xinmiao Wei,Wei Li,Cun You,Qiang Tao,Tian Cui,Pinwen Zhu
Electrically conductive silicon nitride ceramics with both high hardness and electrically conductive properties are promising advancing ceramics. However, ensuring the high hardness while simultaneously enhancing their electrical conductivity poses a great challenge. In this work, Si 3 N 4 -carbon composites with different carbon content were synthesized with diamond phase transformation method under high pressure and high temperature (HPHT). The α→β phase transition in silicon nitride enables the coexistence of α/β phases, offering a hardness of up to 23.15 ± 0.08 GPa, comparable to dense silicon nitride ceramics and significantly higher than synthesized silicon nitride-graphite composites. Diamond uniformly distributed in the silicon nitride matrix is graphitized at high temperatures to form conductive channels, reducing resistivity to 2 × 10 - ⁴ Ω∙m, over a dozen orders of magnitude lower than pristine silicon nitride. This phase transition sinter mechanism provides a method for designing conductive Si₃N₄-based ceramics with high hardness.
研究领域:
材料科学
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陶瓷工程
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2019
·
IF 6.361
Yongqiang Li,Ling Zhang,Chunzhong Li
Scratch properties of polysiloxane coatings are critical to their application in the many fields which require long-term protection and aesthetics. In this work, modified silica nanoparticles (m-SiO 2 ) containing epoxy group dispersed homogeneously in polysiloxane coatings by in situ polymerization process. The homogeneous dispersion of m-SiO 2 is beneficial to the scratch resistance, which has only slight effect on the transparency of polysiloxane coatings. According to the results of macro and nano scratch tests, the first critical loads for polysiloxane coating with 0.75 wt% m-SiO 2 were improved 66.7% and 73.3% respectively compared to pure polysiloxane coating. More impressively, the achieved coating also showed an outstanding transmittance of 91%, a high pencil hardness of 8H and a superior hardness of nanoindentation test (HIT), which was about 58.3% higher than pure coating. Additionally, the thermostability and abrasion resistance of the nanocomposite coatings were enhanced with various loadings of m-SiO 2 . This study provides a facile and environmentally friendly method to reinforce scratch resistance of highly transparent polysiloxane nanocomposite coating, which is potential in the application of automobiles and home appliances.
研究领域:
材料科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Fangming Liu,Jiawei Zhang,Pingping Liu,Qihuang Deng,Duanwei He
High pressure obviously decreased the sintering temperature of high melting point ceramics and produced bulks with excellent mechanical and thermal properties. In this study, the effect of pressure alone on the densification process of alumina ceramics was demonstrated. The translucent alumina bulks with unexpected hardness were obtained by compressing α-Al 2 O 3 powder under ultra-high pressure at room temperature. Through analyzing microstructure and hardness of cold compressed samples, the results reveal that ultra-high pressure could crush alumina grains under appropriate pressure, and initiate plastic deformation of grains when the applied pressure exceeds the yield strength of alumina. Thus to enhance the hardness of the samples by grain boundary strengthening and plastic deformation at higher pressure.
研究领域:
材料科学
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力学
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产品关联
DOI
高影响因子
INTEGRATED FERROELECTRICS
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2019
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IF 0.486
Xinling Hu,Dongxu Li,Yanzhen Huang
Titanium carbonitride (TiCN) show many excellent properties as new multifunctional material. In this article, nano-sized TiCN were prepared by environmentally friendly and low-cost hydrothermal processes. The composition, structure and morphology of TiCN were characterized by scanning electron microscopy, transmission electron microscopy, X-ray powder diffraction and X-ray photoelectron spectroscopy. Hardness performance was measured by microhardness tester. Fluorescence performance was tested by fluorescence spectrometer under visible light. Based on the results, the samples prepared at 1000–1100 °C had the highest purity and hardness. The flaky TiCN compounds exhibit excellent mechanical properties and show a promising application in ultra-hard materials.
研究领域:
材料科学
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纳米技术
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED PHYSICS
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2019
·Vol. 125
·期 16
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IF 2.328
Wang Zhiwei,Kou Zili,Zhang Yuanfen,Yang Ming,Gong Hongxia,Liang Hao,Huo Ruizhi,Guan Shixue,Yin Xiaoshuang,He Duanwei
The influence of sintering pressure on the mechanical properties of bulk titanium carbide (TiC) fabricated through work hardening at high pressure and high temperature is investigated systematically. A series of pure polycrystalline TiC samples are prepared by sintering micrometer-sized TiC powders at a pressure of 9.0–14.0 GPa and a temperature of 1500 °C. These samples are then characterized by various techniques for determining their residual stress, grain size, density, microstructural defects, hardness, and fracture toughness. The results demonstrate that the Vickers hardness H V and the fracture toughness K IC depend strongly on the sintering pressure. It is found that the mechanical properties of the sintered samples improve with increasing sintering pressure. The relative density increases with increasing sintering pressure, reaching near full density at 14.0 GPa. The hardness and fracture toughness of the sample sintered at 1500 °C at 14.0 GPa pressure are 31.2 GPa and 4.2 MPa m 1/2 , respectively. The high-pressure and high-temperature environment causes severe plastic deformation of the grains, as well as a high density of dislocations, resulting in a dislocation pileup. The latter, together with the production of defects such as sub-boundaries and stacking faults, provides strengthening and stabilizing effects and improves the material hardness.
研究领域:
材料科学
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力学
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产品关联
DOI
高影响因子
Journal of Coatings Technology and Research
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2016
·Vol. 13
·期 4
·667-676
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IF 1.342
Liao Mali,Sun Dongcheng
A series of ambient-temperature self-crosslinked waterborne polyurethanes denoted as WBPUs were successfully synthesized by incorporating a novel diol chain extender bearing two ketone groups, 2,2-bis(4-(2-hydroxypropoxy levulinate)phenyl)-propane (BHLPP), which was prepared using 2,2-bis(4-(2,3-epoxypropoxy)phenyl)-propane and levulinic acid, with 4,4-methylenedicyclohexyl diisocyanate, poly-neopentylene adipate glycol, and dimethylolpropionic acid. After post-adding adipic dihydrazide (ADH), self-crosslinking was achieved by the reaction between the ketone (–CO–) of BHLPP and the hydrazine (–NHNH 2 ) of ADH during film formation. For comparison, noncrosslinked waterborne polyurethane (WPU) without BHLPP and ADH was prepared. The structure of BHLPP was characterized by IR and NMR. The properties of the WPU and WBPU dispersions were investigated by measuring the stability, particle size, and morphology. The effects of the ratio of n (–NHNH 2 )/ n (–CO–) and the content of BHLPP were studied in terms of hardness, water resistance, solvent resistance, and thermal properties of WPU and WBPU films. The WBPU dispersions exhibited excellent stability, bimodal distribution, and regular spheroid morphology. The optimal ratio of n (–NHNH 2 )/ n (–CO–) for ketone–hydrazine self-crosslinking was 0.75:1. Importantly, the WBPU films showed superior hardness, water resistance, solvent resistance, and thermal properties to WPU film.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
Journal of Environmental Sciences
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2021
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IF 5.565
Biran Zhu,Ziniu Wang,Lei Lei,Yongyong Guo,Jian Han,Bingsheng Zhou
Cadmium (Cd), a ubiquitous environmental hazardous heavy metal, poses a significant threat to the health of aquatic organisms, including teleosts. Although the toxic profile of Cd is well recognized, little is known regarding the overall view of toxic responses to varying aquatic environmental parameters (e.g., water hardness) at an individual level. Herein, differences in water hardness were partially mimicked by adjusting Ca 2+ levels in E3 medium. As an in vivo model, zebrafish embryos were exposed to variable Ca 2+ levels (NV, normal Ca 2+ ; LV, low Ca 2+ ; HV, high Ca 2+ ) alone or combined with 30.7 µg/L Cd 2+ (NC, LC, and HC, respectively) until 144 hr post-fertilization. The genome-wide transcriptome revealed differentially expressed genes between groups. Functional enrichment analysis found that biological processes related to metabolism, particularly lipid metabolism, were significantly disrupted in NC and LC treatments, while a remission was observed in the HC group. Biochemical assays confirmed that the decrease in Ca 2+ enhanced synthesis, inhibited mobilization and increased the storage of lipids in Cd 2+ treatments. This study suggests that the toxic effect of Cd on biological pathways will be influenced by Ca 2+ , which will improve the toxicological understanding and facilitate accurate assessment of Cd.
研究领域:
毒理学
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环境科学
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分子生物学
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产品关联
DOI
PubMed
高影响因子
Materials Today Communications
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2023
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IF 3.8
Xiaonan Wang,Dianzhen Wang,Shuailing Ma,Xinran Dong,Kaixuan Rong,Cun You,Fei Wang,Haibo Li,Dongfei Li,Qiang Tao,Pinwen Zhu
Breaking the contradictory of hardness and toughness in B 4 C is still a challenge to fabricate robust materials. Although compositing B 4 C with carbon nanotubes (CNTs) is an effective way to improve the toughness, the toughness has the limitation about 6 MPa·m 1/2 or hardness below 30 GPa. The limitation of toughness in B 4 C-CNTs composites is caused by the weak interaction between B 4 C and CNTs, which impair the strength of composite. So, in this work, the inner compressive stress is introduced in B 4 C composite with the single-walled carbon nanotube bundles (B 4 C-SWNTb) by high pressure and high temperature (HPHT). The optimal hardness and fracture toughness are 30 GPa and 8.27 MPa·m 1/2 in B 4 C-2 vol% SWNTb composites, which is 3.3 times higher than that of pure B 4 C. The high hardness and excellent toughness of B 4 C-SWNTb composite come from grain refinement of B 4 C particles, strong combination and inner compressive stress between B 4 C and SWNTb. This work holds much significance for improving hardness and toughness simultaneously in robust matrix composites .
研究领域:
材料科学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2023
·
IF 6.6
Xinqi Wang,Lijiu Cao,Yue Hu,Yufang Chen,Tao Jin,Jian Huang,Xinhe Zhang,Shudong Lin
In recent years, the application of highly transparent hydrophobic coatings for anti-smudge of electronic displays, automotive glass surfaces, and solar cell surfaces has attracted significant attention. Melamine-formaldehyde (MF) resin has high transparency and hardness, but due to its own brittleness , there are still some research gaps in the application of high transparent hydrophobic coatings. In this work, a novel hydrophobic melamine was prepared by modifying melamine with stearyl chloride. Based on the hydrophobic melamine and alcohol modifier, a novel MF resin was prepared, which was used to fabricate high-transparency hydrophobic coatings. Long-chain alkyl materials offered low surface free energy property, and polyethylene glycol was introduced to improve the flexibility of MF resins. Therefore, the novel melamine resin coating has the performance advantages of high transparency (>95 %), high hardness (8H), high toughness (1 mm), high gloss, excellent abrasion resistance and hydrophobicity (water contact angle 104°), as well as good self-cleaning ability. This research has important enlightening significance for promoting the application progress of melamine resin in the field of coating.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2022
·
IF 6.206
Mengyu Zhou,Zhiming Ha,Lei Lei,Yuzheng Xia,Peng Mao,Xiaonong Chen,Bifa Fan,Shuxian Shi
Polymeric coating technology provides a cost-effective and convenient solution for the surface pollution and corrosion issues on various substrates. Herein, a series of transparent and omniphobic bio-based polyurethane (PU) coatings with high hardness, excellent anti-smudge and anti-corrosion properties were prepared by using castor oil as bio-polyol, hexamethylene diisocyanate trimer (HDIT) as a cross-linking agent, and a small amount of monocarbinol terminated polydimethylsiloxane (PDMS-OH) as an eco-friendly anti-fouling agent. Effects of the R-value (mole ratio of isocyanate groups to hydroxyl groups) and dosage of PDMS-OH (wt%) on the PU-PDMS coating's hardness, surface wettability , anti-smudge and anti-corrosion performance have been thoroughly investigated. It was found that the higher R-value led to increased coating hardness. The element content of silicon on the coating surface was confirmed to be higher than the theoretical value since the grafted PDMS chains partially enriched from the inner matrix to the coating surface for reducing overall surface energy. Various simulated water-based contaminants could quickly slide off from the coating surface without leaving any traces. Writing traces of oil-based marker could be shrunk immediately after writing and wiped clean from coating surface completely. Such anti-smudge properties could be maintained even after 1000 cycles of polishing. Moreover, the anti-corrosion performance of these PU-PDMS coatings has been investigated through electrochemical tests. The capacitance circular arc radius of PU 1.5 -PDMS 4.0 is 10 times of tinplate and 4 times of PU 1.5 , indicating the obtained coatings could offer better corrosion protection for tinplate than the regular PU coatings. This work would broaden the polyurethane application in omniphobic anticorrosion coatings.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2023
·
IF 7
Jingjing Sun,Shangqing Chen,Yanan Dong,Junfeng Wang,Yi Nie
The removal of hardness and silicon in the reverse osmosis influent is urgently desirable in view of wastewater purification and reuse. However, the development of cost-effective method reducing the hardness and silicon to low level is challenging. Herein, the single step process and double step precipitation process were proposed, aiming at minimize the adverse effect of influent wastewater on reverse osmosis membranes. The optimal dosages of precipitants (FeCl 3 and MgCl 2 ) and the effects of pH values and time were investigated. In the double step process, the concentrations of total hardness and silicon reached the lowest values (11.0 mg·L −1 and 2.1 mg·L −1 ) by adding 400 mg·L −1 MgCl 2 and 300 mg·L −1 FeCl 3 . Subsequently, four schemes for the wastewater treatment were proposed, which scheme D using both FeCl 3 and MgCl 2 as precipitants obtained the lowest cost (1.20 $·t −1 ). This work could provide technological support for removing total hardness and silicon from industrial wastewater and industrial wastewater recycling.
研究领域:
环境工程
·
废水处理
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）