JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2022
·
IF 6.364
Hao Xiong,Anze Shui,Qingliang Shan,Mei Cai,Xiuan Xi,Bin Du
The SiO 2 layer preferentially generated on the surface of silicon carbide abrasives in Polishing Porcelain stoneware tile Residues (PPR) is corroded by silicate liquid during firing, resulting in continuous oxidation and foaming of silicon carbide, which makes the PPR difficult to be reused. The PPR is fired to form a silicate liquid that wraps micron silicon carbide in it. In this work, it is possible to study the corrosion of silicate to silicon carbide at high temperature by using two ( Ceramic-SiC ) and three ( Ceramic-SiO 2 -SiC ) layer structure model to simulate the corrosion of silicate to silicon carbide. The corrosion mechanism of SiC in PPR by silicate liquid during firing is revealed that the corrosion rate at its two sides (interfaces) determines the ultimate change in the thickness of the corrosion layer between the ceramic and the SiO 2 layer. Importantly, the corrosion layer thickness with time on the silicate-SiO 2 cross-section periodically presents wave-like changes, which can be attributed to the ionic migration between layers and the rate at which cations cross the corrosion layer when studying the three-layer model.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2022
·
IF 4.865
Zefei Zhang,Hao Chen,Yingqin Wang,Gang Wang,Lihong Li,Min Zhong,Hao Bai
Low melting point metals, such as copper, are often used as high-temperature cooling equipments and endure harsh environments during operations. This usually leads to reduced service life and reliability. To address this problem, a protective coating was prepared on copper via a slurry method. However, due to the low melting point of copper, solid-state sintering was applied. Therefore, during this process, the defects generated in the ceramic coating could affect the performance of the coating. To reduce the defects, a series of ceramic coating samples using sodium silicate water glass (SSWG) as the binder were prepared, changing the SSWG-to-aggregate mass ratio (SAMR) for each sample. The results showed that they were all related to the SAMR, and there was an optimal SAMR with minimum defects and favourable performance. The non-optimized SAMR lead to more internal defects, that is, microfractures and pores in the coating, resulting to a decline in the coating performance. By identifying the types of defects and quantifying them, the relationship between the SSWG and the generation of defects was studied, and the effect of the defects on the performance of the ceramic coating was analysed in detail. The research presented in this paper provides a method for the improvement of ceramic coatings by optimising the key factors that is the SAMR in solid-state sintering. The effect of thermal stress on the formation of microfracture defects during the sintering was investigated by experiments and simulation. It is found that with increase of sintering temperature , the thermal stress inside the coating increases gradually, resulting in more generation of microfracture defects inside the coating. The inhibition effect of SSWG on thermal stress during the sintering process was verified.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Sehreish Abrar,Zhuang Ma,Ling Liu,Faisal Nazeer,Abdul Malik
The materials which have low thermal conductivity , a good match of coefficient of thermal expansion with SiC-based ceramics matrix composites (CMCs) and excellent resistance against calcium-magnesium-alumina-silicate (CMAS) are suitable candidates for thermal/environmental barrier coating. To fulfil the above requirements we developed a new multicomponent rare earth (Y 0.2 Dy 0.2 Er 0.2 Yb 0.2 Ho 0.2 ) 2 Si 2 O 7 or (5RE 0.2 ) 2 Si 2 O 7 high entropy ceramics pyrosilicate by a single step solid solution method. The x-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) analysis revealed that the as-fabricated bulk composite (5RE 0.2 ) 2 Si 2 O 7 has a single phase β-type structure match well with single rare earth ytterbium disilicate (Yb 2 Si 2 O 7 ) and the different rare earth oxides mixed well with each other. The excellent coefficient of thermal expansion (4 × 10 −6 -5 × 10 −6 °C −1 ) and ultra-low thermal conductivity (0.7–1.6 W/m C) was observed as compared to other single and multicomponent high entropy ceramics composites. The (5RE 0.2 ) 2 Si 2 O 7 ceramics pyrosilicate show an excellent CMAS resistance at various temperatures (1300, 1400, and 1500) °C for 4 h compared with single principle RE disilicates. The above all mentioned results identify that this material is a suitable candidate for coating on the SiC-based ceramics composite for thermal/environmental barrier coating.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
·
2023
·
IF 17.1
Qiang Chu,Congkun Xie,Guodong Cao,Zefeng Hu,Feiyu Li,Yike Fu,Gaorong Han,Xiang Li
A hybrid platform, constructed via the surface “armoring” of living yeasts by a manganese silicate compound (MS@Yeast), is investigated for combinational cancer treatment. The intrinsic characteristics of living yeasts, in both acidophilic and anaerobic conditions, empower the hybrid platform with activated selected colonization in tumors. While silicate particles are delivered in a targeting manner, yeast fermentation occurs at the cancerous region, inducing both alcohol and CO2. The excessive content of alcohol causes the hemangiectasis of tumor tissue, facilitating the penetration of therapeutics into central tumors and subsequent endocytosis. The catalytic Mn2+ ions, released from silicate particles, react with CO2 to induce forceful oxidative stress in tumor cells, ablating the primary tumors. More interestingly, the debris of sacrificed tumor cells and yeasts triggers considerable antitumor immune responses, rejecting both rechallenged and metastatic tumors. The integration of biologically active microorganisms and functional materials, illustrated in this study, provides distinctive perspectives in the exploration of potential therapeutics for tackling cancer.
研究领域:
癌症治疗
·
生物技术
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材料科学
·
免疫学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 34
·23708-23715
·
IF 3.9
Lei Liu,Xianying Shao,Zhenyuan Zhang,Jiayu Liu,Yuebo Hu,Chaofeng Zhu
Eu-doped aluminosilicate oxyfluoride glass prepared via a melt-quenching method was investigated using X-ray diffraction, absorption spectroscopy, X-ray fluorescence spectrometry, photoluminescence spectroscopy and fluorescence decay curves. We found that the reduction of Eu3+ to Eu2+ ions occurred in the glass prepared in air. The emission spectra showed that the intensity of 4f65d → 4f7 transition of Eu2+ ions varied with increasing incident beam wavelength. Meanwhile, the fluorescence lifetimes of Eu3+: 5D0 → 7F2 monitored at 617 nm in the glass change with the variation of excitation wavelength. The energy transfer between Eu2+ and Eu3+ and the emission mechanisms of Eu2+ ions in the glass were also discussed.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
·
2023
·Vol. 54
·期 2
·712-733
·
IF 3
Zhang Xi,Na Hao,Liu Pengyao,Wang Yajun,Li Junguo,Meng Qian,Li Guopeng
Regulating the phase transformation of γ → β in dicalcium silicate (C 2 S) can effectively improve the hydration activity and recycling rate of AOD slag; however, the evolution law for γ → β in C 2 S has not been extensively investigated. In this study, a novel “two-step” γ → α ′ L → β phase transformation method in C 2 S was designed based on the study of the pure C 2 S phase at a nonequilibrium state in the low- and middle-temperature ranges. The “two-step” method can be used to realize the transformation from needle-like nanostructured γ -C 2 S grains to lamellar-structured β -C 2 S grains, exhibiting the trend of interlaminar peeling accompanied by expansion of the particle volume and leading to the appearance of macroscopic lamellar cracking in β -C 2 S particles. In addition, the β -C 2 S mass fraction in AOD slag treated by water cooling at 680 °C reaches a maximum value of 47.5 wt pct, while the treated AOD slag presents abundant holes and defects, which can effectively enlarge the hydration contact area.
研究领域:
材料科学
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2024
·
IF 1.9
Zhanglei Zhu,Bohui Zhao,Jin Wang,Yiming Zhu,Qiuyue Sheng,Zhen Li,Ningning Zhang,Wei Yu
High-ash fine slime has an adverse effect on coal flotation. In this study, the roles of sodium silicate (SS) and sodium carbonate (SC) in the facilitating effect on lean coal flotation (a type of coking coal) were studied when sodium oleate (NaOL) was used as a collector through flotation tests, Scanning Electron Microscope-Energy Dispersive Spectroscopy (SEM-EDS) observations, turbidity measurements, and particle interaction energy calculations. The flotation tests found that SS has a stronger capacity than SC for the improvement of flotation performance of lean coal. Moreover, SEM-EDS observations and turbidity measurements showed that SS presents a stronger weakening effect for the coating of high-ash fine slime on the surface of low-ash coal particles than SC. Furthermore, the particle interaction energy calculations verified that the increase in the energy barrier for the attachment between low-ash coal particle and high-ash fine slime caused by SS is larger than SC, providing theoretical supports for the experiments. Compared to kerosene as a collector, based on the similar ash content, the yield of clean coal increases greatly with the synergistic effect of SS and NaOL. In summary, SS is an appropriate dispersant for lean coal flotation in sodium oleate system.
研究领域:
矿物加工工程
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
CEMENT AND CONCRETE RESEARCH
·
2024
·
IF 10.9
Lu Zhu,Hanxiong Lyu,Yang Liu,Shipeng Zhang,Chi Sun Poon
Solid waste derived clinker design methodology was established based on thermodynamic simulation and experiment validation via the recycling of incinerated sewage sludge ash (ISSA) and recycled concrete fine (RCF). Compared with 1000 °C and 1100 °C, 1200 °C was the optimum temperature for C 2 S-rich clinker synthesis due to the highest simulated belite content after sintering. A utilization rate of 95 % was achieved, accomplishing the maximization of solid waste recycling. Due to the CaCO 3 phase formation by the reaction of high-content belite (46.8 %) with CO 2 , carbonated 1200ARS eco-cement showed higher compressive strength than OPC and other eco-cements. The lowest porosity (18.1 %) with dense microstructure was also obtained by carbonated 1200ARS. Benefiting from the high CO 2 reactivity of belite, 1200ARS displayed the optimum CO 2 sequestration capacity with a higher carbonation degree (30.1 %) than other batches, providing a promising direction for future development of the low-carbon cement industry to achieve environmental sustainability.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
Silicon
·
2024
·
IF 2.8
Huang Yunzhi,Li He,Colombo Paolo
3D printed silica ceramics have the advantages of low thermal expansion coefficient, high thermal stability, easy removal, etc., and are widely used in ceramic core manufacturing. However, in the sintering stage, silica often cracks due to shrinkage and phase transformation, which seriously affects the mechanical properties of the material. The impregnation of alumina sol can promote the formation of cristobalite phase in ceramics, and the mechanical properties of ceramics can be improved with appropriate amount of cristobalite. In this study, 3D printed silica ceramics were impregnated with alumina sol, and the effects of pH value and the concentration of alumina in the sol on the properties of the samples were investigated. When pH was 2.5, the mechanical properties of alumina sol impregnated samples reached a flexural strength of 24.98 ± 0.93 MPa, with a bulk density of 1.70 ± 0.01 g/cm 3 , and an open porosity of 25.82 ± 0.33%. When the ratio of alumina sol to silica sol was 3:1, the mechanical properties of alumina sol impregnated ceramics reached the maximum, with a flexural strength of 33.85 ± 1.69 MPa, a bulk density of 1.73 ± 0.01 g/cm 3 , and an open porosity of 24.02 ± 0.72%.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
CEMENT & CONCRETE COMPOSITES
·
2022
·
IF 9.93
Ruiquan Jia,Qiang Wang,Ting Luo
Understanding the workability of alkali-activated phosphorus slag (AAPS) pastes is fundamental for their efficient application. This study revealed the novel mutual inhibition mechanism through which the alkali dose and silicate modulus affect the workability of AAPS pastes based on the hydration reaction . The slump loss of NaOH-activated phosphorus slag (NAPS) paste was slow, and that of waterglass-activated phosphorus slag (WAPS) paste was faster because the soluble Si in waterglass accelerated the dissolution of the phosphorus slag (PS). At a moderate waterglass modulus, the slump losses of the WAPS pastes were slow because the moderate [Al]/{[Ca]+[Mg]} ratio in the pore solution minimized the difference in the magnitude of mutual inhibition between Ca, Mg and Al, causing all hydrates to form slowly. However, at higher and lower waterglass moduli, the WAPS pastes exhibited fast slump losses because hydrates with excess elements formed rapidly due to the excessively high or low [Al]/{[Ca]+[Mg]} ratio.
研究领域:
土木工程
·
材料科学
✓ 已验证
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2025
·
IF 8
Wei Liu,Jiale Song,Hui Zhao,Zhaokuan Cui,Shuheng Zhang,Yu Qiao,Chenhong Cao,Weiguang Li
The superhydrophobic coating can effectively inhibit the intrusion and adhesion of water-corrosive media on the surface of concrete. However, the poor mechanical stability and expensive materials significantly restricts its application in concrete engineering. Thus, superhydrophobic nano-SiO 2 @silane/silicate coating are successfully prepared by simply spraying nano-SiO 2 @silane on the surface of mortar pretreated by silicate. The pretreated silicate can enable the surface of mortar to enhance flatness and compactness, offering an optimal substrate for spraying nano-SiO 2 @silane hydrolysate. Further, the low surface energy of silane and the micro-nanostructure formed by nano-SiO 2 synergistically make the composite coating possess excellent superhydrophobic properties, with a contact angle of 154° and a slide angle of 5°. Notably, compared with original mortar, the water absorption rate, water vapor transmission rate, and chloride ion penetration depth are reduced by 86.4 %, 67.3 % and 87.9 %, respectively, exhibiting outstanding impermeability. In addition, the coated mortar possesses excellent self-cleaning properties and resistance to rain erosion. Meanwhile, the coated mortar also exhibits excellent resistance to mechanical wear (>200 cycles of abrasions) and resistance to UV radiation (>100 h). Such outstanding comprehensive performance can guarantee concrete to long-term apply in outdoors. This work provides a simple, feasible, economical, and effective research idea for developing superhydrophobic coatings on concrete.
研究领域:
建筑材料学
·
表面工程学
✓ 已验证
产品关联
DOI
高影响因子
CEMENT AND CONCRETE RESEARCH
·
2024
·
IF 10.9
Haosen Ma,Yanjie Tang,Wei Chen,Qiu Li
The immobilisation mechanism of Pu(IV) by Portland cement-based material is not well understood. This study aims to reveal the immobilisation mechanism and occurrence status of Ce(IV) (chemical analogue of Pu(IV)) in Portland cement paste. The addition of Ce(NO 3 ) 4 first slightly retarded then accelerated the early-age hydration of Portland cement , thereby resulting in an increase of compressive strength by 29 %. The main contributor to immobilisation of Ce is Portland cement rather than zeolite . The hydration products were not altered by Ce(NO 3 ) 4 addition, whereas the hydration degree and mean chain length of C-(Al/Ce)-S-H increased. Over 99.99 % of Ce was immobilised by synthesised C-S-H. A analysis of the synthesised C-S-H confirmed the formation of C-Ce-S-H, where Ce tetrahedra took the bridging site of silicate chain of C-Ce-S-H. Nano-crystalline CeO 2 grains were identified, which intermixed with C-Ce-S-H. Approximately 90 % of Ce were immobilised by C-Ce-S-H, and the rest exist as nano-crystalline CeO 2 grains.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）