Universal Journal of Materials Science最新文献

Properties, Selection, Processing, Characterization and Applications of Aluminium - Boron Carbide Metal Matrix Composites: A Comprehensive Review 铝-碳化硼金属基复合材料的性能、选择、加工、表征及应用综述

Universal Journal of Materials Science Pub Date : 2023-07-01 DOI: 10.13189/ujms.2023.110101

A. Dixit, H. B, Ashok B C, A. S L

引用次数: 0

Natural Fiber Composite with α-Resorcylic Acid Based Bio-Epoxy Matrix α-间苯二甲酸基生物环氧基天然纤维复合材料

Universal Journal of Materials Science Pub Date : 2022-12-01 DOI: 10.13189/ujms.2022.100201

M. Barde, M. Auad, Joydan Jones, Yongzhe Yan, Na Lu, S. Pillay, H. Ning

引用次数: 0

Nanotoxicity of Emerging NMC-Family Energy Storage Nanomaterials 新兴nmc家族储能纳米材料的纳米毒性研究

Universal Journal of Materials Science Pub Date : 2022-06-01 DOI: 10.13189/ujms.2022.100101

Temitope D. Soneye, Oladipo O. Olatunji, E. Adesanya

引用次数: 0

Fabrication and Characterization of Li2CO3 Modified Low Temperature Sintered PZT-5H Compositions for Multilayer Piezoelectric Ceramics Li2CO3改性低温烧结PZT-5H多层压电陶瓷复合材料的制备与表征

Universal Journal of Materials Science Pub Date : 2021-12-01 DOI: 10.13189/ujms.2021.090201

Mert Gül, Aysegül Toktaş, Hakan Güleç, M. Gürbüz, A. Dogan

{"title":"Fabrication and Characterization of Li2CO3 Modified Low Temperature Sintered PZT-5H Compositions for Multilayer Piezoelectric Ceramics","authors":"Mert Gül, Aysegül Toktaş, Hakan Güleç, M. Gürbüz, A. Dogan","doi":"10.13189/ujms.2021.090201","DOIUrl":"https://doi.org/10.13189/ujms.2021.090201","url":null,"abstract":"In the use of piezocermic applications, piezoceramic compositions have high d 33 (>500 pC/N) and Kt (2000) such as PZT-5H. However, these ceramics can be sintered at high temperatures up to 1200˚C). Since these require the use of Ag-Pd inner electrodes with higher Pd ratio, multilayer ceramics are not preferred due to their high costs. In this study, it was aimed to reduce the sintering temperature without dramatically losing the electrical properties of the PZT-5H ceramics with high d 33 , kp and dielectric constant values. In this context, the PZT-5H composition was modified with different proportions of Li 2 CO 3 and sintered for 2-4 hours at different sintering temperatures such as 875˚C-1250˚C depending on the ratio of additions. The piezoelectric and ferroelectric properties of the ceramics were investigated and obtained values were compared with undoped PZT-5H. It was observed that the d 33 values of the different amount of Li 2 CO 3 added compositions sintered at optimum sintering temperature are close that the composition without additives. In this way, it is predicted that 9/1 Ag/Pd and Ag inner electrode materials can be used in multilayer production and their costs can be reduced.","PeriodicalId":375998,"journal":{"name":"Universal Journal of Materials Science","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123830440","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

Electrospun Chitosan/Silver Doped-Hydroxyapatite Nano-Fibers on Thermal Conductivity Modified Si3N4 Ceramics with Different Sintering Cooling Rate 电纺丝壳聚糖/掺银羟基磷灰石纳米纤维在不同烧结冷却速率下导热改性Si3N4陶瓷上的研究

Universal Journal of Materials Science Pub Date : 2021-06-01 DOI: 10.13189/ujms.2021.090101

M. Gürbüz, Pınar Uyan

{"title":"Electrospun Chitosan/Silver Doped-Hydroxyapatite Nano-Fibers on Thermal Conductivity Modified Si3N4 Ceramics with Different Sintering Cooling Rate","authors":"M. Gürbüz, Pınar Uyan","doi":"10.13189/ujms.2021.090101","DOIUrl":"https://doi.org/10.13189/ujms.2021.090101","url":null,"abstract":"Dental implants are exposed to cycle loadings and thermal changes. The thermal properties of the materials in dentistry are important in terms of the biological changes that these materials will create in living tissues. The normal temperature of the oral cavity varies between 32-37℃, while eating, it can vary between 0-80℃ with hot-cold foods which led to the trauma and implant deteriorations. Si3N4 ceramic is a good candidate to solve these problems due to its inertness, high fracture toughness, strength, high thermal shock resistance and low density. Also, the surface modification of Si3N4 is important to enhance the interaction between the implant and bone. In recent years, biodegradable organic biomaterials as CTs (CTs) and silver doped hydroxyapatite (HAPs) combinations have a great attention to improve the Si3N4 effectiveness. In this study, MgO, SiO2, and Y2O3 included substrates were fabricated for fast and slow cooling rate during sintering in dental applications. CTs/HAPs fibers were coated with the electrospinning method to develop a modified Si3N4 substrate. The crystal structure, microstructure and thermal diffusivity measurement of the substrates and spun surfaces were characterized with XRD, SEM and Laser Flash Method. From the results, the higher density (3.25g/cm3) and thermal conductivity (46.35W/mK) for Si3N4 were observed for the fast cooling process during sintering compared with the slow cooling process (3.22g/cm3 and 44.60 W/mK). The hardness and strength of the fast cooled substrate were measured as 1350 HV and 1800 MPa which are greater than the slowly cooled samples (1190 HV, 1670 MPa). CTs /HAPs fibers are homogeneously deposited with electrospinning on the surface of the fast cooled Si3N4 substrate to develop the surface functionality. This functionalized substrate can be a candidate in dental applications.","PeriodicalId":375998,"journal":{"name":"Universal Journal of Materials Science","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127693219","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

Development and Testing of High Performance Nylon12 (PA12) Based Natural Fiber Composites 高性能尼龙12 (PA12)基天然纤维复合材料的研制与试验

Universal Journal of Materials Science Pub Date : 2020-12-01 DOI: 10.13189/UJMS.2020.080301

Siddhartha Brahma, Garo Tritrian, S. Pillay, Na Lu, H. Ning

{"title":"Development and Testing of High Performance Nylon12 (PA12) Based Natural Fiber Composites","authors":"Siddhartha Brahma, Garo Tritrian, S. Pillay, Na Lu, H. Ning","doi":"10.13189/UJMS.2020.080301","DOIUrl":"https://doi.org/10.13189/UJMS.2020.080301","url":null,"abstract":"Kenaf based nylon 12 (PA12) composites were successfully made using hydroentanglement and film stack compression molding. The combination of natural fibers with an engineering polymer with a relatively low melting temperature can potentially have high strength and modulus composites. The chopped kenaf fibers were treated in a NaOH solution. The NaOH treatment is used to improve the roughness of the surface and also expose cellulose fibers within the fibers to help improve bonding with the resin. Tensile tests of samples with treated and untreated fibers with a fiber weight fraction of 40% show that the treated fiber composite has an improvement of 13% and 18% in its strength and modulus respectively. The resulting fibers were used to make preforms using hydroentanglement process. The process of hydroentanglement is typically used in making paper products. The use of this process to make composite materials using chopped fibers is a very unique approach adopted for this research. Three different fiber weight fractions were looked at namely 40%, 50% and 60%. Tensile and flexure testing of the samples showed a consistent increase with an increase in the fiber weight fraction. Morphological characterization of the fibers showed that treatment removed excess fluff and dirt and also had striations on the fiber which would lead to better fiber wet-out. SEM images of the fractured surface of the sample with 50% by weight of kenaf fibers showed that there was some fiber bundling as expected leading to dry zones within the composite which could potentially lead to crack initiation. The novelty of the research is developing preforms using chopped natural fibers using hydroentanglement process and the ability to combine these natural fibers with low melting point PA 12 leading to obtaining high strength composite without compromising the structural integrity of the kenaf fibers.","PeriodicalId":375998,"journal":{"name":"Universal Journal of Materials Science","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130747988","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

Study of the High Performance Ceramic-Matrix Composites (CMC's) by Combustion in the TiO2–Al–C System 高性能陶瓷基复合材料在TiO2-Al-C体系中的燃烧研究

Universal Journal of Materials Science Pub Date : 2020-06-01 DOI: 10.13189/ujms.2020.080201

B. Bendjemil, J. Noudem, M. Mouyane, J. Bernard, Yannick Guel, D. Houivet

{"title":"Study of the High Performance Ceramic-Matrix Composites (CMC's) by Combustion in the TiO2–Al–C System","authors":"B. Bendjemil, J. Noudem, M. Mouyane, J. Bernard, Yannick Guel, D. Houivet","doi":"10.13189/ujms.2020.080201","DOIUrl":"https://doi.org/10.13189/ujms.2020.080201","url":null,"abstract":"The purpose of this work is to decrease or eliminate porosities of ETER-VC (Electrothermal Explosion Reaction-Volume Combustion) products with the sintering additives. The Ti–C system has been synthesized for its advantages for refractory, abrasive and structural applications. We attempted to densify TiC by using iron addition; this metal is introduced through a reaction 3TiO3+Al+C. This mixture reacted exothermically (ϪH298 = -1072.7 kJ) and this heat is released according to the Fe addition using the following reaction: 3TiO3+4Al+3C+xFe→3TiC+2Al2O3+xFe. .X-ray diffraction analysis indicated that intermetallic Fe3Al, TiC and Al2O3 are the main phases formed in the reinforced high performance ceramic-matrix composites. The increasing of x wt. % iron decreased the lattice parameter of TiC. Field emission scanning electron microscopy examinations showed that the addition of Fe decreased TiC particle size and changed their growth controlling mechanism. Also, Raman spectroscopy analysis demonstrate that at higher Fe contents, oxygen dissolved in the TiC crystal structure leading to the formation of titanium oxy-carbide with lower lattice parameter and residual un-reacted carbon in the products. The adiabatic temperatures for the reactions containing x wt. % Fe estimated using the thermodynamic data according to Merzhanov criteria. Thus, doping method is finally used to fabricate materials by ETER-VC combustion mode for industrial applications.","PeriodicalId":375998,"journal":{"name":"Universal Journal of Materials Science","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123328339","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

Effects of Transition Energy on Intra-Band Photoluminescence of Zinc Oxide (ZnO) Semiconductor under Low injection Level 低注入能级下跃迁能对氧化锌半导体带内光致发光的影响

Universal Journal of Materials Science Pub Date : 2019-07-01 DOI: 10.13189/UJMS.2019.070301

Getu Endale

引用次数: 2

Optimization of Manufacturing of Operational Amplifier Manufactured by Using Field-effect Heterotransistor to Decrease Their Dimensions 场效应异质晶体管运算放大器尺寸减小的工艺优化

Universal Journal of Materials Science Pub Date : 2019-04-01 DOI: 10.13189/UJMS.2019.070202

E. Pankratov

引用次数: 0

Optical Properties of Lead Doped Titanium Oxide of Thin Films Prepared by Sol-Gel Method at Low Temperature 溶胶-凝胶法制备铅掺杂氧化钛薄膜的低温光学性质

Universal Journal of Materials Science Pub Date : 2019-04-01 DOI: 10.13189/UJMS.2019.070203

F. Abbas, R. Bensaha

{"title":"Optical Properties of Lead Doped Titanium Oxide of Thin Films Prepared by Sol-Gel Method at Low Temperature","authors":"F. Abbas, R. Bensaha","doi":"10.13189/UJMS.2019.070203","DOIUrl":"https://doi.org/10.13189/UJMS.2019.070203","url":null,"abstract":"The present paper reports on the structural and optical properties of undoped and 5% Pb-doped TiO 2 thin films deposited on glass and silicon substrates prepared by the sol-gel technique have been investigated. Dip-coated thin films have been examined at different annealing temperatures (400-500℃). The results shows that Pb-doped TiO 2 thin films start to crystallize at low temperature (400℃). The morphology and surface structure of the films were studied by scanning electron microscopy (SEM) and atomic force microscopy (AFM) reveals a nanoporous structure of anatase and brookite with particle sizes ranging between 20 nm and 100 nm. Refractive index and porosity were calculated from the measured transmittance spectrum. SE study permits to determine the annealing temperature effect on the optical properties and the optical gap of the Pb-doped TiO 2 thin films. Photoluminescence (PL) spectrum revealed that emission increase with annealing temperature. A slight shift of transmission curves to higher wavelengths is observed for curves of Pb-doped TiO 2 thin films in comparison with those undoped, this was explained by the lowering of the band gap of TiO 2 .","PeriodicalId":375998,"journal":{"name":"Universal Journal of Materials Science","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127877264","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