Effects of ZrO2 Nanoparticles on the Microstructure and Thermal-protective Properties of PEO Coating on Al-12.5%Si Alloy

Wang, Ping; Han, Je-Chin; Yan, Junheng; Wang, Jiandong

doi:10.1007/s11595-019-2030-1

Cited by 6 publications

(3 citation statements)

References 19 publications

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“…Literature shows that the addition of rare earth oxides has tremendous potential to improve sintering behaviour and properties related to magnesium aluminate spinel [33,34]. Many authors reported that thermal shock, hot strength properties, and coating performance of magnesia refractories are improved with rare earth oxide addition, especially Y 2 O 3 [35][36][37][38]. In alumina magnesia castable [39] addition of 0.5-1 wt% yttria and ceria was reported to improve the properties, and excess yttria was reported to form YAG (yttrium aluminium garnet) phase.…”

Section: Introductionmentioning

confidence: 99%

Effect of Y₂O₃ additions on low cement high alumina refractory castable

Kumar

Bishoyi

Sarkar

2023

Ironmaking & Steelmaking

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The effect of adding yttria (Y 2 O 3 ) up to 2 wt.% on low cement high alumina castable is studied. Castable compositions with self-flowing and vibratable consistency (distribution coefficients, q = 0.21 and 0.29) are prepared using commercial raw materials and processed as per the conventional processing route, cured at 110°C, and fired at 1000 and 1550°C. An increase in yttria content is found to improve the physical and mechanical properties of castables for all temperatures. Phase analysis confirms the formation of the yttrium aluminate phase, and microstructural evaluation at 1550°C indicates enhanced bonding between the matrix and aggregate phase resulting in better density and strength properties.

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Section: Introductionmentioning

confidence: 99%

Effect of Y₂O₃ additions on low cement high alumina refractory castable

Kumar

Bishoyi

Sarkar

2023

Ironmaking & Steelmaking

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“…In a recent study, an increased degradation temperature was reported for high density polyethylene (HDPE) nanocomposites of ZrO 2 nanomaterials [18]. In addition, scientists indicated that thermal protective performance of nano-ZrO 2 /poly(ethylene oxide) (PEO) nanocomposites improves with an increase of nanoparticles concentration in the system [19]. Elsewhere, Reyes-Acosta et al [20] introduced this nanomaterial to poly(methylmetacrylate)(PMMA) and reported improvement of mechanical properties and better UV protection compared to pure PMMA.…”

Section: Introductionmentioning

confidence: 99%

Polyurethane/Silane-Functionalized ZrO2 Nanocomposite Powder Coatings: Thermal Degradation Kinetics

et al. 2020

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A polyurethane (PU)-based powder coating reinforced with vinyltrimethoxysilane (VTMS)-functionalized ZrO 2 nanoparticles (V-ZrO 2 ) for thermal stability was developed. Chemical structure, microstructure and thermal degradation kinetics of the prepared coatings were investigated. The peak of aliphatic C-H vibrating bond in the Fourier transform infrared (FTIR) spectrum of V-ZrO 2 was a signature of VTMS attachment. Scanning electron microscopy (SEM) images reveled that, by increase of V-ZrO 2 content from 0.1 to 0.3 wt.% and then 0.5 wt.%, some agglomerations of nanoparticles are formed in the PU matrix. Thermogravimetric analysis (TGA) of the PU/V-ZrO 2 powder coatings was performed at different heating rates nonisothermally to capture alteration of activation energy (E a ) of degradation of PU/V-ZrO 2 powder coatings as a function of partial mass loss by using Friedman, Kissinger-Akahira-Sunose (KAS), Ozawa-Wall-Flynn (FWO) and modified Coats-Redfern isoconversional approaches. It was observed that by addition of 1 wt.% V-ZrO 2 to PU resin the early state degradation temperature at 5% weight loss increased about 65 • C, suggesting a physical barrier effect limiting the volatility of free radicals and decomposition products. Incorporation of 5 wt.% ZrO 2 led to about 16% and 10% increase in E a and LnA of blank PU, respectively, which was indicative of higher thermal resistance of nanocomposite powder coatings against thermal degradation. There was also obvious agreement between model outputs and experimental data. The results reveal that nanocomposite coating shows superior thermal properties compared to neat PU powder coatings, and the presence of nano ZrO 2 in sufficient amount causes retardation of the thermal decomposition process.

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“…NPs are frequently dispersed in deionized water for the preparation of insulation paper modified by nano doping [3][4][5], and agglomeration is generally an issue in this process. Currently, research on the agglomeration mechanism of nanoparticles mainly focuses on the analysis of their macro parameters, such as the concentration [6], content [7,8], shape, or size [9]. In this work, the micro-mechanism will be further discussed.…”

Section: Introductionmentioning

confidence: 99%

Agglomeration mechanism and restraint measures of SiO₂ nanoparticles in meta-aramid fibers doping modification via molecular dynamics simulations

Tang

et al. 2020

Nanotechnology

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In this work, the nanoparticle agglomeration process has been studied via molecular dynamics simulations to uncover the agglomeration mechanism. When the nanoparticles were far from each other in an aqueous solution, they mainly diffused because of influence of water molecules. When nanoparticles were close to each other, hydrogen bonds between the nanoparticles actively contributed to their agglomeration. In addition, the agglomeration of nanoparticles was also related to their sizes and concentration. A higher nanoparticle concentration led to an increased probability of nanoparticle contact and easier agglomeration. Smaller nanoparticles could diffuse quickly and aggregate more easily, hence resulting in agglomeration. Additionally, to restrain the agglomeration of silicon dioxide nanoparticles, promote compatibility between the inorganic silicon dioxide nanoparticles and organic polymer meta-aramid fibers, and strengthen the interaction between the two molecules, 3-aminopropyltriethyloxy silane was used for chemical modification of the surface of the nanoparticles. By comparing the interaction energy and hydrogen bond energy between interfaces before and after modification, a grafting density of 502% (1/Å2) was achieved, which was comparatively the best. The results of this work provide a valuable basis for further discussion and improvement of the performance of meta-aramid fiber insulation via doping hybridization with silicon dioxide nanoparticles.

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Effects of ZrO2 Nanoparticles on the Microstructure and Thermal-protective Properties of PEO Coating on Al-12.5%Si Alloy

Cited by 6 publications

References 19 publications

Effect of Y₂O₃ additions on low cement high alumina refractory castable

Effect of Y₂O₃ additions on low cement high alumina refractory castable

Polyurethane/Silane-Functionalized ZrO2 Nanocomposite Powder Coatings: Thermal Degradation Kinetics

Agglomeration mechanism and restraint measures of SiO₂ nanoparticles in meta-aramid fibers doping modification via molecular dynamics simulations

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Effects of ZrO2 Nanoparticles on the Microstructure and Thermal-protective Properties of PEO Coating on Al-12.5%Si Alloy

Cited by 6 publications

References 19 publications

Effect of Y2O3 additions on low cement high alumina refractory castable

Effect of Y2O3 additions on low cement high alumina refractory castable

Polyurethane/Silane-Functionalized ZrO2 Nanocomposite Powder Coatings: Thermal Degradation Kinetics

Agglomeration mechanism and restraint measures of SiO2 nanoparticles in meta-aramid fibers doping modification via molecular dynamics simulations

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Product

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About

Effect of Y₂O₃ additions on low cement high alumina refractory castable

Effect of Y₂O₃ additions on low cement high alumina refractory castable

Agglomeration mechanism and restraint measures of SiO₂ nanoparticles in meta-aramid fibers doping modification via molecular dynamics simulations