Materials最新文献_第8页

Corrosion Resistance of Mn-Containing AFA Alloys in LBE at 550 °C with Controlled Oxygen Concentration of 10^-6 wt.

IF 3.1 3区材料科学

Materials Pub Date : 2025-03-17 DOI: 10.3390/ma18061328

Menghe Tu, Yajie He, Zihui Liu, Xiaogang Fu, Lingzhi Chen

引用次数: 0

Analysis of the Structural, Chemical, and Mechanical Characteristics of Polyurethane Foam Infused with Waste from Thermal Processing.

IF 3.1 3区材料科学

Materials Pub Date : 2025-03-17 DOI: 10.3390/ma18061327

Anna Magiera, Monika Kuźnia, Wojciech Jerzak

{"title":"Analysis of the Structural, Chemical, and Mechanical Characteristics of Polyurethane Foam Infused with Waste from Thermal Processing.","authors":"Anna Magiera, Monika Kuźnia, Wojciech Jerzak","doi":"10.3390/ma18061327","DOIUrl":"10.3390/ma18061327","url":null,"abstract":"The continuous generation of agricultural, industrial, and urban waste necessitates effective waste management strategies. One promising approach is incorporating these residues as fillers in polymer composites. This study investigated the influence of coal processing-derived fillers, specifically microspheres and fluidized-bed combustion fly ash, on the structure and properties of composite rigid polyurethane foam. Polyurethane foams were produced through manual mixing and casting, with composite foams containing a combination of 5% microspheres and 5-15% fly ash by weight. The analysis of the samples investigated their structural, thermal, and mechanical properties. The samples consistently displayed predominantly pentagonal, regularly shaped cells. Infrared spectroscopy revealed no observable chemical bonding between the matrix and filler materials. Mechanical analysis was performed to evaluate the materials' characteristics, revealing significant variations in compressive strength and Young's modulus values. The results indicate that the addition of fillers did not impact the cellular and chemical composition of the polyurethane matrix. Furthermore, the composite material specimens were subjected to accelerated aging in a laboratory dryer and outdoor exposure in order to assess their thermal stability. This analysis revealed notable alterations in both the cellular composition and mechanical properties of the composite foam materials.","PeriodicalId":18281,"journal":{"name":"Materials","volume":"18 6","pages":""},"PeriodicalIF":3.1,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11944080/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143720076","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Vibration Characteristics Analysis of Boring Bar with Tunable Dynamic Vibration Absorber.

IF 3.1 3区材料科学

Materials Pub Date : 2025-03-17 DOI: 10.3390/ma18061324

Yanqi Guan, Guangbin Yu, Qingming Hu, Donghui Xu, Jiao Xu, Pavel Lushchyk

{"title":"Vibration Characteristics Analysis of Boring Bar with Tunable Dynamic Vibration Absorber.","authors":"Yanqi Guan, Guangbin Yu, Qingming Hu, Donghui Xu, Jiao Xu, Pavel Lushchyk","doi":"10.3390/ma18061324","DOIUrl":"10.3390/ma18061324","url":null,"abstract":"In deep-hole boring processes, boring bars with a large length-to-diameter ratio are typically employed. However, excessive overhang significantly reduces the boring bar's stiffness, inducing vibrational effects that severely degrade machining precision and surface quality. To address this, the research objective is to suppress vibrations using a tunable-parameter boring bar. This paper proposes a novel Tunable Dynamic Vibration Absorber (TDVA) boring bar and designs its fundamental parameters. Based on the derived dynamic model, the vibration characteristics of the proposed boring bar are analyzed, revealing the variation in damping performance under different excitation frequencies. By establishing the relationship between TDVA stiffness, damping, and the axial compression of rubber bushings, optimal parameter combinations can be precisely identified for specific excitation frequencies. Ultimately, adjusting the TDVA's axial compression displacement (0.1-0.5 mm) significantly expands the effective machining frequency range compared to conventional designs while maintaining operational reliability. This study proposes a novel Tunable Dynamic Vibration Absorber (TDVA) that innovatively integrates axial compression to achieve coupled stiffness and damping adjustments, addressing the rigidity-adaptability trade-off in deep-hole boring tools.","PeriodicalId":18281,"journal":{"name":"Materials","volume":"18 6","pages":""},"PeriodicalIF":3.1,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11943975/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143720148","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

La/Fe-Bimetallic-Modified Red Brick Powder for Phosphate Removal from Wastewater: Characterization, Adsorption, and Mechanism.

IF 3.1 3区材料科学

Materials Pub Date : 2025-03-17 DOI: 10.3390/ma18061326

Yunrui Zhao, Hui Luo, Rubin Han, Shiheng Tao, Meng Liu, Ming Tang, Jiayao Xing, Limin Chen, Bao-Jie He

{"title":"La/Fe-Bimetallic-Modified Red Brick Powder for Phosphate Removal from Wastewater: Characterization, Adsorption, and Mechanism.","authors":"Yunrui Zhao, Hui Luo, Rubin Han, Shiheng Tao, Meng Liu, Ming Tang, Jiayao Xing, Limin Chen, Bao-Jie He","doi":"10.3390/ma18061326","DOIUrl":"10.3390/ma18061326","url":null,"abstract":"The use of construction waste red brick powder (RBP) to prepare adsorbents for phosphate removal from wastewater represents a promising technology with substantial research potential. This study investigates the preparation of La-based magnetic red brick powder (La-Fe-RBP) via bimetallic modification to enhance its adsorption performance. The key characteristics, adsorption process, adsorption mechanism, and practical applications of the modified adsorbent were analyzed. The obtained results suggested that the underlying adsorption mechanism of La-Fe-RBP was best described by the Langmuir and pseudo-second-order kinetic models, which suggested that the adsorption mechanism was monolayer chemical adsorption. La-Fe-RBP exhibited rapid kinetics, achieving adsorption saturation in just 40 min, significantly faster than RBP (360 min). Additionally, isotherm experiments determined the highest theoretical adsorption capacity as 42.835 mg/g. More importantly, La-Fe-RBP exhibited efficient phosphate adsorption within a pH ranging from 3 to 8. Furthermore, La-Fe-RBP exhibited high selectivity for phosphate ions in the presence of coexisting ions (SO42-, NO3-, Cl-, HCO3-, Mg2+, and Ca2+), demonstrating its robustness and effectiveness in complex water conditions. FTIR and XPS analyses demonstrated that ligand exchange and electrostatic attraction were the primary mechanisms underlying phosphate adsorption by La-Fe-RBP. Domestic sewage treated with La-Fe-RBP met the Class IV surface water environmental quality standards in China. The findings of this study prove that the La-Fe-RBP composite material, characterized by high adsorption efficiency and strong selectivity, holds significant potential for removing phosphates from real wastewater.","PeriodicalId":18281,"journal":{"name":"Materials","volume":"18 6","pages":""},"PeriodicalIF":3.1,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11944173/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143719989","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Preparation of Wood Fiber-Polyurethane Plastic Composite with Water Resistance and High Strength.

IF 3.1 3区材料科学

Materials Pub Date : 2025-03-17 DOI: 10.3390/ma18061314

Xi Yuan, Shiyu Fu, Hao Liu

{"title":"Preparation of Wood Fiber-Polyurethane Plastic Composite with Water Resistance and High Strength.","authors":"Xi Yuan, Shiyu Fu, Hao Liu","doi":"10.3390/ma18061314","DOIUrl":"10.3390/ma18061314","url":null,"abstract":"The current widespread use of plastics is a significant source of environmental pollution and increases the carbon load in the atmosphere, which has precipitated an urgent drive to replace plastics with biomass-based materials. In this paper, we prepared a lignocellulose-based, high-strength, water-resistant composite based on eucalyptus waste sawdust combined with a polyurethane prepolymer. The preparation process included pretreating sawdust with deep eutectic solvents (DESs) to remove some of the lignin and hemicellulose. A prepolymer preparation involving isocyanate groups using the prepolymerization of polyethylene glycol (PEG) with hexamethylene diisocyanate (HDI) grafted the prepolymers to the hydroxyl of the pretreated wood fibers, which were subsequently blended with acetylated pretreated sawdust to create the composite. The composite contained 67% wood fibers, possessed good tensile strength, and exhibited Young's moduli of 18 MPa and 484 MPa. It was water-resistant with a contact angle of 92° and had a low water absorption of 32%, and it maintained a wet tensile strength of 5.71 MPa. The composite offers several advantages, including UV protection and thermal stability. This high-performance wood waste composite provides an alternative green production option for producing plastic materials.","PeriodicalId":18281,"journal":{"name":"Materials","volume":"18 6","pages":""},"PeriodicalIF":3.1,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11943818/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143719798","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study on the Low-Temperature Performance Evaluation Indicators of Asphalt Binder Based on the Poker Chip Test.

IF 3.1 3区材料科学

Materials Pub Date : 2025-03-17 DOI: 10.3390/ma18061322

Meng Guo, Chenlu Sun, Yiqiao Wan, Xiuli Du

{"title":"Study on the Low-Temperature Performance Evaluation Indicators of Asphalt Binder Based on the Poker Chip Test.","authors":"Meng Guo, Chenlu Sun, Yiqiao Wan, Xiuli Du","doi":"10.3390/ma18061322","DOIUrl":"10.3390/ma18061322","url":null,"abstract":"Low-temperature cracking is a primary failure mode of asphalt pavement. The poker chip test provides a straightforward and efficient approach to simulating the film state of asphalt binders in asphalt structures. By measuring the tensile strength and ultimate tensile strain of the binder film, this test can effectively evaluate the cracking resistance and ductility of asphalt binders. Accordingly, this study employed the poker chip test to analyze the evolutions of low-temperature cracking resistance under various aging levels. To ensure the reliability of tensile strength and ultimate tensile strain, a Pearson correlation analysis was conducted between the two indicators and the traditional low-temperature performance evaluation indicators: stiffness modulus, creep rate, and the Glover-Rowe (G-R) parameter. The results indicate that the tensile strength and ultimate tensile strain of styrene-butadiene-styrene (SBS)-modified asphalt are higher than those of 70# base asphalt at the same aging level. With increasing aging time, the tensile strength of both SBS-modified asphalt and 70# base asphalt increases, while the ultimate tensile strain decreases. Additionally, the tensile strength and ultimate tensile strain are sensitive to changes in asphalt binder types and aging levels. They have a good linear correlation with stiffness modulus and creep rate, with correlation coefficients exceeding 0.9. Due to the distinct characteristics represented, the correlation between the two indicators and the G-R parameter is relatively weaker, with correlation coefficients exceeding 0.7. The findings of this study demonstrate that tensile strength and ultimate tensile strain are effective indicators for assessing the low-temperature performance of asphalt binders. They can serve as substitute indicators of stiffness modulus and creep rate, respectively.","PeriodicalId":18281,"journal":{"name":"Materials","volume":"18 6","pages":""},"PeriodicalIF":3.1,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11943990/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143720095","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dynamical Projective Operatorial Approach (DPOA): Theory and Applications to Pump-Probe Setups and Semiconductors.

IF 3.1 3区材料科学

Materials Pub Date : 2025-03-16 DOI: 10.3390/ma18061310

Amir Eskandari-Asl, Adolfo Avella

引用次数: 0

Magnetic Biochar Prepared with Rosa roxburghii Residue as Adsorbents for Congo Red Removal.

IF 3.1 3区材料科学

Materials Pub Date : 2025-03-16 DOI: 10.3390/ma18061306

Xiaojuan Zhang, Xueqin Yang, Feiran Xie, Xianglan Chen, Yutao Zhang, Qiuyun Zhang

引用次数: 0

Hardness Changes Due to the Morphological Evolution of Microstructural Phases in an As-Solidified Zn-Fe Alloy.

IF 3.1 3区材料科学

Materials Pub Date : 2025-03-16 DOI: 10.3390/ma18061311

Guilherme Calixto Carneiro de Sousa, Andrei de Paula, Andre Barros, Amauri Garcia, Noé Cheung

{"title":"Hardness Changes Due to the Morphological Evolution of Microstructural Phases in an As-Solidified Zn-Fe Alloy.","authors":"Guilherme Calixto Carneiro de Sousa, Andrei de Paula, Andre Barros, Amauri Garcia, Noé Cheung","doi":"10.3390/ma18061311","DOIUrl":"10.3390/ma18061311","url":null,"abstract":"Zn-Fe alloys are gaining attention for their use as bioabsorbable implants, and their development requires a deeper understanding of the processing-microstructure-property relationships. This study aimed to analyze the influence of microstructural features on the hardness of a Zn-2 wt.%Fe alloy. To achieve this, a casting was fabricated using directional solidification, and samples that experienced various cooling conditions were extracted from it. The results show that the microstructure of the investigated alloy was composed of a Zn-rich phase (matrix) and FeZn13 intermetallic particles. Four different morphological patterns of the microstructure could be formed, depending on the thermal conditions during solidification. For each of these patterns, a reduction in the spacing between FeZn13 particles, a parameter representing the degree of microstructural refinement, did not lead to a considerable increase in the hardness of the Zn-2wt.%Fe alloy. Hardness was shown to be more dependent on the morphology of the FeZn13 intermetallics and Zn-rich matrix than on the degree of refinement of these microstructural phases. Therefore, the present research provides valuable insights into the development of enhanced Zn-Fe alloys by demonstrating how microstructural features can affect their properties, particularly in terms of hardness and morphologies of the microstructural phases.","PeriodicalId":18281,"journal":{"name":"Materials","volume":"18 6","pages":""},"PeriodicalIF":3.1,"publicationDate":"2025-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11943910/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143720204","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Second-Order Effects in Lightweight Aggregate Concrete Slender Columns.

IF 3.1 3区材料科学

Materials Pub Date : 2025-03-16 DOI: 10.3390/ma18061312

Ewelina Kołodziejczyk, Tomasz Waśniewski, Vojtěch Starý, Richard Dvořák, Martyna Rabenda

{"title":"Second-Order Effects in Lightweight Aggregate Concrete Slender Columns.","authors":"Ewelina Kołodziejczyk, Tomasz Waśniewski, Vojtěch Starý, Richard Dvořák, Martyna Rabenda","doi":"10.3390/ma18061312","DOIUrl":"10.3390/ma18061312","url":null,"abstract":"This paper covers the analysis of the behavior of columns made of LWAC (Lightweight Aggregate Concrete), which can be used as a substitute for normal-density concrete. This work presents an experimental research program focused on second-order effects in slender elements (λ = 74) made of LWAC and normal-density concrete tested under eccentric load. Elements with two ratios of longitudinal reinforcement (0.9%, 2.3%) were considered. Despite the similar compressive strengths of the concrete, the significantly different moduli of elasticity of the two types of concrete caused the lightweight concrete columns to show higher displacements, leading to their lower load bearing capacity. This disproportion was more pronounced for low longitudinal reinforcement. In the second part of this experiment, the behavior of the columns was simulated using models taken from the literature. The analysis showed that the models often do not accurately predict the elastic modulus or LWAC limit strain of concrete, so when trying to predict the behavior of this type of element accurately, these parameters should be determined experimentally.","PeriodicalId":18281,"journal":{"name":"Materials","volume":"18 6","pages":""},"PeriodicalIF":3.1,"publicationDate":"2025-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11943633/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143720050","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0