AIMS Materials Science最新文献_第4页

Increasing the charge/discharge rate for phase-change materials by forming hybrid composite paraffin/ash for an effective thermal energy storage system 通过形成杂化石蜡/灰分复合材料来提高相变材料的充放电速率，从而形成有效的储热系统

IF 1.8

AIMS Materials Science Pub Date : 2023-01-01 DOI: 10.3934/matersci.2023005

B. Suyitno, D. Rahmalina, R. Rahman

{"title":"Increasing the charge/discharge rate for phase-change materials by forming hybrid composite paraffin/ash for an effective thermal energy storage system","authors":"B. Suyitno, D. Rahmalina, R. Rahman","doi":"10.3934/matersci.2023005","DOIUrl":"https://doi.org/10.3934/matersci.2023005","url":null,"abstract":"Low-temperature latent heat storage (LHS) systems are suitable for incorporating paraffin as the storage material. However, they face difficulty in actual implementation due to low thermal conductivity (TC). The present study used volcanic ash as an environmentally friendly and cost-effective material to increase the TC of paraffin. Three composites of paraffin/ash were prepared with ash proportions of 10 wt%, 30 wt% and 50 wt%. Characterizations were done to evaluate the average TC and properties. Thermal performance evaluation was conducted by analyzing the static charge/discharge cycle. The average TC for paraffin was 0.214 W/m·K. Adding volcanic ash improved the TC to 19.598 W/m·K. It made the charge/discharge performance of the composite better than that of pure paraffin. The charge rate for the composite ranged from 3.83 ℃/min to 5.12 ℃/min. The highest discharge rate was obtained at 4.21 ℃/min for the composite paraffin50/ash50. The freezing temperature for the composite is influenced by the ash proportion, which can be taken as a suitable approach to adjust the freezing point of paraffin-based thermal energy storage (TES). The detailed results for the characterization and thermal performance evaluation are described thoroughly within the article. The overall result indicates that volcanic ash is applicable for improving the TC and charge/discharge rate of paraffin-based TES.","PeriodicalId":7670,"journal":{"name":"AIMS Materials Science","volume":"1 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70089739","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 11

Ductile fracture toughness of Al 5754-H111 alloy using essential work of fracture method 断口法基本功对Al - 5754-H111合金韧性的影响

IF 1.8

AIMS Materials Science Pub Date : 2023-01-01 DOI: 10.3934/matersci.2023020

M. Abdellah, Nouby M. Ghazaly, Al-Shimaa H. Kamal, Abo-El Hagag, A. Seleem, G. Abdel-Jaber

{"title":"Ductile fracture toughness of Al 5754-H111 alloy using essential work of fracture method","authors":"M. Abdellah, Nouby M. Ghazaly, Al-Shimaa H. Kamal, Abo-El Hagag, A. Seleem, G. Abdel-Jaber","doi":"10.3934/matersci.2023020","DOIUrl":"https://doi.org/10.3934/matersci.2023020","url":null,"abstract":"The aluminium alloy 5754 H-111 is a high-strength alloy with a remarkable corrosion resistance, particularly to seawater. It is widely used in the aerospace, marine, and automotive industries. In this work, the influence of fracture toughness methods applied to two thin aluminium sheets with different thicknesses (1.8 mm and 5 mm) was analysed. The first method was the essential work of fracture (EWF) method. It was applied at room temperature at a deformation rate of 1 mm/min with a double-edge notched tensile specimen (DENT) to measure the fracture toughness ($ {w}_{e} $) of a material with ductile damage based on the stored energy of the body. The second method was a compact tensile test (CT) to determine the linear elastic fracture toughness. For the EWF, DENTs of 4, 6, 10, 12, and 14 mm were used in the centre section. The EWF values were 273 kJ/m2 and 63 kJ/m2 for the aluminium sheets with thicknesses of 5 mm and 1.8 mm, respectively. The surface energies JIC determined using CT were 34.5 kJ/m2 and 10.6 kJ/m2, respectively, for these sheets. These values are highly similar. Furthermore, the percentage errors of the elastic EWF were 5.8% and 8.4%, respectively, for the two thicknesses. The fractures were of the stress types in which the pits and voids grow in conjunction. In addition, both deep and isolated large dimples were well distributed in the aluminium, which is the main ductile deformation concept.","PeriodicalId":7670,"journal":{"name":"AIMS Materials Science","volume":"1 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70090025","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Potassium sodium niobate (KNN) lead-free piezoceramics: A review of phase boundary engineering based on KNN materials 铌酸钾钠无铅压电陶瓷:基于铌酸钾钠材料的相界工程研究进展

AIMS Materials Science Pub Date : 2023-01-01 DOI: 10.3934/matersci.2023045

Hidayah Mohd Ali Piah, Mohd Warikh Abd Rashid, Umar Al-Amani Azlan, Maziati Akmal Mohd Hatta

引用次数: 0

A versatile approach towards development of easy-to-clean transparent nanocoating systems with pronounced anti-static properties for various substrates 一种开发易于清洁的透明纳米涂层系统的通用方法，具有明显的抗静电性能，可用于各种基材

IF 1.8

AIMS Materials Science Pub Date : 2023-01-01 DOI: 10.3934/matersci.2023008

N. Papadopoulos, P. P. Falara, P. Vourna

{"title":"A versatile approach towards development of easy-to-clean transparent nanocoating systems with pronounced anti-static properties for various substrates","authors":"N. Papadopoulos, P. P. Falara, P. Vourna","doi":"10.3934/matersci.2023008","DOIUrl":"https://doi.org/10.3934/matersci.2023008","url":null,"abstract":"Sol-gel is a widely applied method for the development of hydrophobic anti-soiling coatings. Most of them however suffer from serious drawbacks which restrict their generic applicability, especially on surfaces with limited number of hydroxyl groups. This study aims to propose a facile and straightforward strategy for the development of an \"one-fits-all\" anti-soiling coating with strong adhesion to a variety of hard, non-absorbent surfaces. The structure of the proposed composition is based on a two-component coating system consisting of an organopolysilazane primer and an alkoxysilane topcoat, based on a quaternarized ammonium silane. Morphology and microstructure were systematically studied, while hydrophobicity, adhesion, stability, abrasion and chemical resistance were determined on aluminum and PC substrates. The anti-soiling behavior of the proposed coating system was also evaluated. It was found that the polysilazane primer provided mechanical and chemical robustness regardless of substrate type, while the quaternarized silane offered pronounced easy-to-clean and anti-static attributes. The combination of such attributes within a single sol-gel coating system is highly beneficial for numerous applications.","PeriodicalId":7670,"journal":{"name":"AIMS Materials Science","volume":"1 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70089946","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Biogenic synthesis, characterization and effects of Mn-CuO composite nanocatalysts on Methylene blue photodegradation and Human erythrocytes Mn-CuO复合纳米催化剂的生物合成、表征及对亚甲基蓝光降解和人红细胞的影响

IF 1.8

AIMS Materials Science Pub Date : 2023-01-01 DOI: 10.3934/matersci.2023019

Carlos N. Kabengele, Giresse N. Kasiama, E. M. Ngoyi, C. L. Inkoto, Juvenal M. Bete, P. B. Babady, D. Tshibangu, D. Tshilanda, H. M. Kalele, P. Mpiana, K. Ngbolua

{"title":"Biogenic synthesis, characterization and effects of Mn-CuO composite nanocatalysts on Methylene blue photodegradation and Human erythrocytes","authors":"Carlos N. Kabengele, Giresse N. Kasiama, E. M. Ngoyi, C. L. Inkoto, Juvenal M. Bete, P. B. Babady, D. Tshibangu, D. Tshilanda, H. M. Kalele, P. Mpiana, K. Ngbolua","doi":"10.3934/matersci.2023019","DOIUrl":"https://doi.org/10.3934/matersci.2023019","url":null,"abstract":"Each year more than 150, 000 tons of dyes are released in effluents by industries. These chemicals entities non-biodegradable and toxic can be removed from effluent by metallic nanomaterials. The aqueous extract of Manotes expansa leaves is used as reducing and stabilizing agent in the biogenic synthesis of Mn-CuO nanocomposites. The nanoparticles obtained were characterized using UV-visible spectroscopy, X-ray Diffraction (XRD), X-ray Fluorescence, Dynamic Light Scattering (DSL), and Scanning Electron Microscopy (SEM). The hemotoxicity of biosynthesized nanomaterials was assessed by evaluating their hemolytic activity using erythrocytes as a model system. The photocatalytic activity of Mn-CuO was carried out by photocatalytic degradation of Methylene Blue dye as a model. The results obtained by UV-vis spectroscopy showed a Plasmonic Surface Resonance band at 408 nm. XRD and X-ray fluorescence made it possible to identify the presence of particles of formula Mn0.53Cu0.21O having crystallized in a Hexagonal system (a = 3.1080 Å and c = 5.2020 Å). Spherical morphology and average height 49.34 ± 6.71 nm were determined by SEM and DSL, respectively. The hemolytic activity of biosynthesized nanomaterials revealed that they are not hemotoxic in vitro (% hemolysis 3.2%) and 98.3% of Methylene Blue dye was removed after 120 min under irradiation with solar light in the presence of Mn-CuO nanocomposites.","PeriodicalId":7670,"journal":{"name":"AIMS Materials Science","volume":"1 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70090006","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Study of the structure and mechanical properties of composites used in the oil and gas industry 研究石油和天然气工业中复合材料的结构和力学性能

IF 1.8

AIMS Materials Science Pub Date : 2023-01-01 DOI: 10.3934/matersci.2023033

P. Rusinov, Z. Blednova, A. Rusinova, G. Kurapov, Maxim Semadeni

{"title":"Study of the structure and mechanical properties of composites used in the oil and gas industry","authors":"P. Rusinov, Z. Blednova, A. Rusinova, G. Kurapov, Maxim Semadeni","doi":"10.3934/matersci.2023033","DOIUrl":"https://doi.org/10.3934/matersci.2023033","url":null,"abstract":"This article describes the structure and properties of the developed hybrid composite Hastelloy X (NiCrFeMo)-AlMoNbTaTiZr-cBNSiCNiAlCo. The composite was obtained by the high velocity oxygen fuel spraying (HVOF) method in a protective atmosphere with a subsequent high-temperature thermomechanical treatment. In order to obtain new information about the structure, we studied the metallophysical properties of the composite using electron microscopy and X-ray diffraction analysis, as well as the mechanical properties and phase composition. We studied the influence of high-energy mechanical processing of high-entropic and ceramic materials on the structural-phase state and composite quality. We determined the optimal technological parameters of HVOF in a protective atmosphere, followed by a high-temperature thermomechanical treatment. Additionally, we optimized these parameters to form a hybrid composite providing the highest adhesion and low porosity. Moreover, we investigated the microhardness of the composite layers. On the basis of complex metallophysical studies, we examined the composite formation. In order to determine the endurance limit in comparison to various other composite materials, we carried out cyclic endurance tests of the developed materials.","PeriodicalId":7670,"journal":{"name":"AIMS Materials Science","volume":"46 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70090070","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Scrapping of PEKK-based thermoplastic composites retaining long fibers and their use for compression molded recycled parts 保留长纤维的pek基热塑性复合材料的报废及其用于压缩成型回收部件的用途

AIMS Materials Science Pub Date : 2023-01-01 DOI: 10.3934/matersci.2023044

Alejandro Sandá, Rocío Ruiz, Miguel Ángel Mafé, Jon Ander Sarasua, Antonio González-Jiménez

引用次数: 0

Low-cost piezoelectric sensors and gamma ray attenuation fabricated from novel polymeric nanocomposites 新型聚合物纳米复合材料制备的低成本压电传感器和伽马射线衰减

IF 1.8

AIMS Materials Science Pub Date : 2023-01-01 DOI: 10.3934/matersci.2023015

Shaimaa Mazhar Mahdi, M. Habeeb

引用次数: 14

Welding on C67 steel grade sheet: Influence of the parameters and post welding heat treatment C67钢板焊接工艺参数及焊后热处理的影响

IF 1.8

AIMS Materials Science Pub Date : 2023-01-01 DOI: 10.3934/matersci.2023025

U. K. Dhar, Md. Farabi Rahman, Mustafa O Ayanoglu, Ahammad Abdullah

{"title":"Welding on C67 steel grade sheet: Influence of the parameters and post welding heat treatment","authors":"U. K. Dhar, Md. Farabi Rahman, Mustafa O Ayanoglu, Ahammad Abdullah","doi":"10.3934/matersci.2023025","DOIUrl":"https://doi.org/10.3934/matersci.2023025","url":null,"abstract":"In batch operation, most industries require engineers to maintain low hardness on the welded parts, particularly for low carbon steel. This article focuses on tungsten inert gas (TIG) welding performed on 0.90 mm of a C67 grade sheet by varying different welding parameters such as current, velocity, and temperature. Samples were collected from the tool side, mid-wall, and operator side for metallographic and micro-hardness examinations considering various parameters. Without post welding heat treatment (PWHT), the welded parts were quenched at room temperature, while with PWHT the welded parts were kept at 710 ℃ for 99 s after welding, and subsequently, the samples were cooled slowly by air at ambient temperature. An increase in hardness was registered in either the fusion zone or melted zone, with decrements in the heat affected zone (HAZ) for both procedures. When the the welding was performed without PWHT, a martensitic and bainitic microstructure was noticed in the melting zone (MZ) and HAZ, respectively. In contrast, a bainitic microstructure was observed in either the melting or heat affected zone in the welding with PWHT. Metallographic images revealed crack propagation when welding was performed without PWHT. A larger HAZ was noted in the welding sample with PWHT, and hardness was also relatively lower compared the samples without PWHT. There was no significant difference in hardness among the samples taken from tool side, mid-wall, and operator side for both procedures. Finally, the lowest microhardness (265 HV) was found in the MZ when the welding was carried out with PWHT employing a 90 A current and 10 mm/s velocity.","PeriodicalId":7670,"journal":{"name":"AIMS Materials Science","volume":"1 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70090045","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Influence of helium plasma on the structural state of the surface carbide layer of tungsten 氦等离子体对钨表面碳化物层结构状态的影响

IF 1.8

AIMS Materials Science Pub Date : 2023-01-01 DOI: 10.3934/matersci.2023040

M. Skakov, A. Miniyazov, V. Baklanov, A. Gradoboev, T. Tulenbergenov, I. Sokolov, Yernat Kozhakhmetov, G. Zhanbolatova, I. Kukushkin

{"title":"Influence of helium plasma on the structural state of the surface carbide layer of tungsten","authors":"M. Skakov, A. Miniyazov, V. Baklanov, A. Gradoboev, T. Tulenbergenov, I. Sokolov, Yernat Kozhakhmetov, G. Zhanbolatova, I. Kukushkin","doi":"10.3934/matersci.2023040","DOIUrl":"https://doi.org/10.3934/matersci.2023040","url":null,"abstract":"This paper presents the results of the experimental studies of the helium plasma interaction with a surface carbide layer of tungsten. The experiments were carried out on a plasma beam installation (PBI) at a constant energy of incoming ions of 2 keV and at a surface temperature of the tungsten carbide layer of ~905 and ~1750 ℃. The local parameters (Te, n0) of the helium plasma were evaluated using the probe method and spectrometric analysis of the plasma composition. The helium plasma irradiated two types of the carbide layer on the tungsten surface, WC and W2C. The mechanisms of changing the tungsten surface morphology in the result of the plasma irradiation have been described. The study of the surface structure of the tungsten samples with a carbide layer of two types (WC, W2C) after the exposure to the helium plasma has revealed two different types of the formation of helium bubbles and changes in the surface morphology. The physical mechanism of the formation of helium bubbles consists in the capture of helium atoms by the thermal vacancies generated at high temperature by the material surface. However, with a significant increase in temperature to 1750 ℃, the formation of the bubbles was no longer observed and the sample surface had a developed coral-like structure with crystallographically oriented grains.","PeriodicalId":7670,"journal":{"name":"AIMS Materials Science","volume":"1 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70090870","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0