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Nanomaterials, Advanced Materials and Protective Coatings 纳米材料、先进材料和防护涂层
Pub Date : 2024-03-18 DOI: 10.4028/b-kto2dp
Kazuo Umemura, Ramesh K. Agarwal, Ian McAndrew
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引用次数: 0
Microstructure and Super-Elasticity of Fe-33Mn-17Al-8.5Ni (at. %) Alloy for Structural Applications 用于结构应用的 Fe-33Mn-17Al-8.5Ni (at. %) 合金的显微组织和超弹性
Pub Date : 2024-03-18 DOI: 10.4028/p-ltj0kd
Paul Kamugisha, Mohamed F.M. Fahmy, Ayman Ali Ahmed Nada, M. Gepreel
The control of the residually stressed γ’-FCC phase in the grain boundaries that affects super-elasticity in the promising Fe-Mn-Al-Ni shape memory alloy (SMA) and grain size enhancement was an epitome for research in the current study. New composition Fe-33Mn-17Al-8.5Ni (at. %) was designed with the help of thermocalc software TCFE 11 database, produced in an electric arc furnace under an argon atmosphere and systematically investigated in the as-cast and heat-treated conditions. Characterization was performed using optical microscopy, X-ray diffraction measurements (XRD), and compression tests. Controlling the cooling conditions after heat treatment (HT) with high flowrate air cooling helped to reduce on the formation of the detrimental phase, γ’ at the grain boundaries as well as observed some grain growth in the microstructure without necessarily causing cracking as reported previously with quenching in cold water. The yield strength depicting the stress-induced martensitic transformation was 925 MPa for as cast and 909 MPa upon heat treatment. From cyclic compression loading/deloading training, a recovery strain of 2.1% and 2.3% was attained at 800 MPa maximum stress in the as-cast and heat treated-conditions, respectively.
晶界中残余应力γ'-FCC相影响着前景广阔的铁锰铝镍形状记忆合金(SMA)的超弹性和晶粒尺寸增大,如何控制残余应力γ'-FCC相是本次研究的一个缩影。在热致性软件 TCFE 11 数据库的帮助下,设计了新的成分 Fe-33Mn-17Al-8.5Ni(at.采用光学显微镜、X 射线衍射测量 (XRD) 和压缩试验进行了表征。热处理(HT)后使用高流速空气冷却来控制冷却条件,有助于减少晶界有害相γ'的形成,并观察到微观结构中的一些晶粒长大,但不一定会像之前报道的冷水淬火那样导致开裂。铸造时的屈服强度为 925 兆帕,热处理时的屈服强度为 909 兆帕,反映了应力诱导的马氏体转变。通过循环压缩加载/减载训练,在最大应力为 800 兆帕时,铸态和热处理状态下的恢复应变分别为 2.1% 和 2.3%。
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引用次数: 0
Effect of Rubber Formula on Performance of Natural Rubber Based Foam for Insulating Ceiling Board Application 橡胶配方对用于隔热天花板的天然橡胶基泡沫性能的影响
Pub Date : 2024-03-18 DOI: 10.4028/p-2hhh04
Natyada Jantawong, K. Boonkerd, K. Hancharoen
In this study, various NR:EPDM:EVA rubber foams were prepared. The ratios of NR:EPDM:EVA were at 50:20:30 and 50:10:40. The amounts of blowing agent, dinitrosopentamethylenetetramine (or Supercell DP) were 5, 6, and 7 part per hundred of rubber (phr). The vulcanizing agent, dicumyl peroxide (or DCP) loadings were at 0.7 and 1 phr. The influence of rubber formula on the performance of the obtained rubber foam was discussed here. The results showed that increasing EVA proportion and Supercell DP loading and decreasing DCP loading led to the decrease in density, thus giving the lower thermal conductive rubber foam which was suitable for using as an insulating ceiling board. However, the above condition gave the rubber foam with slightly inferior mechanical properties including lower hardness and higher % compression set.
本研究制备了各种 NR:EPDM:EVA 橡胶泡沫。NR:EPDM:EVA 的比例分别为 50:20:30 和 50:10:40。发泡剂二亚硝基五亚甲基四胺(或 Supercell DP)的用量分别为每百橡胶 5、6 和 7 个百分点(phr)。硫化剂过氧化二异丙苯(或 DCP)的用量分别为 0.7 和 1 phr。此处讨论了橡胶配方对所得橡胶泡沫性能的影响。结果表明,增加 EVA 比例和 Supercell DP 用量以及减少 DCP 用量会导致密度下降,从而得到导热性较低的橡胶泡沫,适合用作隔热天花板。然而,在上述条件下,橡胶泡沫的机械性能略差,包括硬度较低和压缩永久变形率较高。
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引用次数: 0
Phase Formation of Novel Al-Mg-Zn-Cu-Si Lightweight High Entropy Alloy 新型铝-镁-锌-铜-硅轻质高熵合金的相形成
Pub Date : 2024-03-18 DOI: 10.4028/p-uia1wc
Godson Nyaforkpa, Mohamed Emam, M. Gepreel
In this paper, a novel lightweight and low-cost Al35Mg20Zn15Cu10Si20 at. % (Al26.17Mg13.47Zn27.18Cu17.61Si15.57 wt.%) has been successfully designed, produced, and characterized. The thermophysical parameters were used to understand the phases associated with this alloy that show a low density of 3.42 g/cm3. The designed alloy was manufactured using both the arc and the muffle furnace. The alloy was characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM) equipped with an energy dispersive spectrometer (EDS). The alloy is characterized by a multiphase microstructure with three major phases including Mg2Si intermetallic phase and eutectic. The volume fraction of the eutectic and the intermetallic phases are 37.83 and 34.99 respectively. The heat capacities of the alloy were also determined by means of differential scanning calorimetry (DSC). The alloy provides a high latent heat of up to 124 J/g, which is one of the highest among the high-temperature metallic materials. The present work provides valuable information for researchers wishing to design and manufacture industrial-grade high-entropy alloys (HEAs).
本文成功设计、生产并表征了一种新型轻质低成本 Al35Mg20Zn15Cu10Si20 at.热物理参数用于了解这种合金的相关相,其密度较低,仅为 3.42 g/cm3。使用电弧炉和马弗炉制造了所设计的合金。使用 X 射线衍射(XRD)、配备能量色散光谱仪(EDS)的扫描电子显微镜(SEM)对合金进行了表征。合金的微观结构具有多相特征,主要有三相,包括 Mg2Si 金属间相和共晶。共晶相和金属间相的体积分数分别为 37.83 和 34.99。合金的热容量也是通过差示扫描量热法(DSC)测定的。该合金的潜热高达 124 J/g,是高温金属材料中潜热最高的材料之一。本研究为希望设计和制造工业级高熵合金(HEAs)的研究人员提供了有价值的信息。
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引用次数: 0
Electrochemical Metallization for Enhancing the Quality and Performance of Electric Motor 用于提高电机质量和性能的电化学金属化技术
Pub Date : 2024-03-18 DOI: 10.4028/p-4zyngq
Carlos Martinez Llaccohua, William Cordero Escobar, Rebeca Salvador Reyes, Grimaldo Quispe Santivañez
The present research aimed to evaluate the effect of nickel-based electrochemical metallization (EMNi) on the quality and performance of electric motor components, compared to high-velocity oxy-fuel (HVOF) thermal spray coating, the most widely used coating in the mining industry. The experiment was conducted using motor components comprised of 4340 VCN steel, 4140 VCL steel, 1045 steel, and stainless steel, which underwent both treatments. The surface temperature of the components was monitored during the processing stage, followed by evaluations of their Rockwell hardness (HRC) and surface characteristics (taper, ovality, parallelism, finish, wear) at the onset (day 0) and after 2 years of use the results indicate that EMNi delivers electric motor components with superior finishes and extended warranty and service life in comparison to HVOF.
本研究旨在评估镍基电化学金属化(EMNi)对电机部件质量和性能的影响,并与采矿业最广泛使用的高速富氧燃烧(HVOF)热喷涂涂层进行比较。实验使用了由 4340 VCN 钢、4140 VCL 钢、1045 钢和不锈钢组成的电机部件,对其进行了两种处理。实验结果表明,与 HVOF 相比,EMNi 能使电机部件获得更好的表面效果,延长保修期和使用寿命。
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引用次数: 0
Analysis of the Curing Behavior of Cyanate/Epoxy Resins for Fusion Magnets 用于聚变磁铁的氰酸盐/环氧树脂固化行为分析
Pub Date : 2024-03-18 DOI: 10.4028/p-d57zjm
Baoleer Baoleer, Yue Xiang, Li Shi, Wen Tao Sun, Zhi Xiong Wu, Rong Jin Huang, Lai Feng Li
ITER IF coils and the German WX-7 star simulator fusion reactor both use cyanate ester/epoxy resin as the matrix material for their insulation structure. The main reason is that cyanate ester/epoxy resin insulation materials have low-temperature mechanics and radiation resistance, and have extremely low rheological properties and long applicability periods. However, high-energy polymerization will occur when the two are mixed, releasing a huge amount of heat. This study used different molds to prepare cyanate ester/epoxy resin (mass ratio 4:6), and used DSC (Differential Calorimetry Scanning) thermal analyzer and temperature monitoring to study the curing behavior and thermal stability of cyanate ester-modified epoxy resin-based materials. After multiple optimizations, the resin was completely cured within a controllable range, and there was no significant change in the glass transition temperature before and after adjustment.
国际热核聚变实验堆中频线圈和德国 WX-7 恒星模拟聚变反应堆都使用氰酸酯/环氧树脂作为其绝缘结构的基体材料。主要原因是氰酸酯/环氧树脂绝缘材料具有低温力学性能和抗辐射性能,流变性能极低,适用期长。然而,两者混合时会发生高能聚合,释放出大量热量。本研究使用不同的模具制备氰酸酯/环氧树脂(质量比为 4:6),并使用 DSC(差示量热扫描)热分析仪和温度监测仪研究氰酸酯改性环氧树脂基材料的固化行为和热稳定性。经过多次优化,树脂在可控范围内完全固化,玻璃化转变温度在调整前后没有明显变化。
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引用次数: 0
Investigation of Polylactic Acid Nanofibers as Enhanced Plant Growth Medium by Improved Melt-Blowing Method 改良熔喷法将聚乳酸纳米纤维作为增强型植物生长介质的研究
Pub Date : 2024-03-18 DOI: 10.4028/p-fap6yj
S. Tsai, Wei Wu, Hiroyoshi Sota, T. Hirogaki, E. Aoyama
An improved melt-blowing method have developed to manufacture the organic nonwoven nanofibers through our previous study. As a parallel phase, this study explores the potential of polylactic acid (PLA) nanofibers as a plant growth substrate, emphasizing the unique properties and performance when mixed with pellets. Preliminary experiments comparing different fiber materials, cultivated crops, and fiber diameters demonstrate the favorable characteristics of PLA, such as wettability and growth promotion. Comparative experiment with rockwool, a commonly used medium, shows that PLA nanofibers exhibit superior growth performance. On the other hand, a solidified PLA medium is produced and tested. Hydroponic tests using solidified medium configurations with varying fiber diameters and soil conditioners further confirm the benefits of PLA as a medium for plant growth. The findings suggest that PLA nanofibers have the potential to revolutionize cultivation practices, providing sustainable and environmentally friendly alternatives to traditional substrates.
通过之前的研究,我们开发出了一种改进的熔喷法来制造有机无纺纳米纤维。与此同时,本研究还探索了聚乳酸(PLA)纳米纤维作为植物生长基质的潜力,强调了其与颗粒混合后的独特性质和性能。比较不同纤维材料、栽培作物和纤维直径的初步实验证明了聚乳酸的良好特性,如润湿性和生长促进性。与常用培养基岩棉的对比实验表明,聚乳酸纳米纤维具有优异的生长性能。另一方面,生产并测试了一种固化聚乳酸培养基。使用不同纤维直径和土壤改良剂的固化介质配置进行的水培试验进一步证实了聚乳酸作为植物生长介质的优势。研究结果表明,聚乳酸纳米纤维有望彻底改变栽培实践,为传统基质提供可持续和环保的替代品。
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引用次数: 0
Modeling and Optimization of Turning Hastelloy C-276 under Sustainable Machining Environments 在可持续加工环境下车削哈氏合金 C-276 的建模与优化
Pub Date : 2024-03-18 DOI: 10.4028/p-bj6vjw
Balkar Singh, Sehijpal Singh, V. Aggarwal, Gurpreet Singh
Due to their numerous applications in the aerospace, chemical, and nuclear power industries, environmentally responsible superalloy machining is a major problem in the current production environment. Additionally, Ni-based superalloys are regarded as difficult to manufacture because of their great strength under hot and chemically reactive settings. Therefore, it is necessary to machine these materials using adequate cooling and lubricating solutions. Current study has been based on the optimisation and modelling of turning Hastelloy C-276 under dry, flood, and least lubrication system. A Taguchi L-9 arrangement was used as plan of experiment and modeling was enabled through ANOVA, regression analysis and Taguchi optimization. The results depicted optimal parameters for surface roughness and temperature at v2-f1-d1-CE3 and v1-f2-d1-CE3. Likewise, for CRC and shear angle the best combination was observed at v3-f3-d2-CE2. From ANOVA analysis, the benefaction of C.E, depth of cut and feed rate on S.R been listed as 46.70%, 40.44% and 10.66%. Likewise, for temperature cutting speed has benefaction of (53.09%), cooling environment (23.94%), depth of cut (6.10%) and feed rate 5.49% . In similar fashion, CRC and Shear angle were influenced by feed rate and cutting speed having contribution of 62.89% and 5.15% respectively. Furthermore, minimum standard error between the fitted and observed values for S.R., temperature, CRC, and shear angle were calculated as 0.0149, 7.66, 0.267, and 1.80 units. Finally, the marginal reduction of cutting temperature and surface roughness through utilization of MQL implies the sustainable machining conditions.
由于超级合金在航空航天、化工和核电工业中的广泛应用,对环境负责的超级合金加工是当前生产环境中的一个主要问题。此外,镍基超级合金在高温和化学反应环境下具有很高的强度,因此被认为难以加工。因此,有必要使用适当的冷却和润滑解决方案来加工这些材料。目前的研究基于在干式、泛滥式和最少润滑系统下车削哈氏合金 C-276 的优化和建模。实验计划采用 Taguchi L-9 安排,并通过方差分析、回归分析和 Taguchi 优化进行建模。结果表明,表面粗糙度和温度的最佳参数分别为 v2-f1-d1-CE3 和 v1-f2-d1-CE3。同样,CRC 和剪切角的最佳组合是 v3-f3-d2-CE2。通过方差分析,C.E、切削深度和进给量对 S.R 的影响分别为 46.70%、40.44% 和 10.66%。同样,温度对切削速度的影响为 53.09%,对冷却环境的影响为 23.94%,对切削深度的影响为 6.10%,对进给量的影响为 5.49%。同样,进给率和切削速度对 CRC 和剪切角的影响分别为 62.89% 和 5.15%。此外,S.R.、温度、CRC 和剪切角的拟合值与观测值之间的最小标准误差分别为 0.0149、7.66、0.267 和 1.80 个单位。最后,通过使用 MQL,切削温度和表面粗糙度略有降低,这意味着加工条件是可持续的。
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引用次数: 0
Optical Absorption of TaS2 and TaSe2 Transition-Metal Dichalcogenides TaS2 和 TaSe2 过渡金属二卤化物的光学吸收
Pub Date : 2024-03-18 DOI: 10.4028/p-2afd0s
T. Do, P. Shih, G. Gumbs
We present a theoretical study of the optical absorption of the group-V transition-metal dichalcogenids TaX2 (X = S, Se) by using the Wannier tight-binding Hamiltonian method. The absorption spectra show diverse and interesting features, including dominant peaks and shoulder-like structures. We provide an in-depth discussion on the optical spectral structures based on the energy dispersion and density of states. This work can advance the understanding of optical properties of two-dimensional materials which is important in the search for proper candidates for next-generation electronic devices.
我们采用 Wannier 紧约束哈密顿方法,对 V 族过渡金属二钙钛矿 TaX2(X = S、Se)的光吸收进行了理论研究。吸收光谱显示出多种有趣的特征,包括主峰和肩状结构。我们根据能量弥散和态密度对光学光谱结构进行了深入讨论。这项工作可以促进对二维材料光学特性的理解,这对寻找下一代电子器件的合适候选材料非常重要。
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引用次数: 0
Characteristics of Mesoporous Silica Nanoparticles-Benzotriazole (MSN-BTA) Using Rice Husk as an Environmentally Friendly Precursor 以稻壳为环保前驱体的介孔二氧化硅纳米颗粒-苯并三唑(MSN-BTA)的特性
Pub Date : 2024-03-18 DOI: 10.4028/p-81peok
L. Rumiyanti, Shania Garcia, Muhammad Mahfudz Fauzi Syamsuri, Ronius Marjunus, N. Istiqomah, Chotimah Chotimah, E. Suharyadi
This work identifies the effect of loading benzotriazole (BTA) on mesoporous silica nanoparticles (MSN) as an initial step in preparing a self-healing corrosion-protective coating with environmentally friendly precursors, rice husk, which advantages cheaper, renewable, and contains relatively high silica. This research uses the sol-gel method to synthesize MSN. Based on the result, it is known that the loading of BTA strongly affects the porosity properties of these nanoparticles. The pore sizes increase as the surface areas and pore volumes decrease. However, the silicone composition shrinks. Based on pore size, it is known that all the samples in this work were mesoporous materials (over 2 nm) with spherical and globular morphologies (like coral reefs).
这项工作确定了在介孔二氧化硅纳米粒子(MSN)上负载苯并三唑(BTA)的效果,作为利用稻壳这种环境友好型前体制备自修复腐蚀保护涂层的第一步。稻壳具有成本较低、可再生和二氧化硅含量相对较高的优点。本研究采用溶胶-凝胶法合成 MSN。根据结果可知,BTA 的负载量对这些纳米粒子的孔隙率特性有很大影响。随着表面积和孔体积的减小,孔径也会增大。然而,硅氧烷成分却缩小了。根据孔径大小可知,这项工作中的所有样品都是介孔材料(2 纳米以上),具有球形和球状形态(如珊瑚礁)。
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引用次数: 0
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Solid State Phenomena
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