Materials Science-medziagotyra最新文献_第9页

Diffusion and Thermal Shock Behaviour of Silicate Dental Ceramics 硅酸盐牙科陶瓷的扩散和热冲击行为

IF 1.1 4区材料科学

Materials Science-medziagotyra Pub Date : 2023-02-24 DOI: 10.5755/j02.ms.30414

B. Ertuğ

引用次数: 0

Stress Field Simulation and its Experimental Verification of Carburizing-Quenching Process Performed on 18CrNiMo7-6 Steel 18CrNiMo7-6钢渗碳淬火过程应力场模拟及试验验证

IF 1.1 4区材料科学

Materials Science-medziagotyra Pub Date : 2023-02-24 DOI: 10.5755/j02.ms.30932

S. Qin, H. Ma, Lianxiang Wang

{"title":"Stress Field Simulation and its Experimental Verification of Carburizing-Quenching Process Performed on 18CrNiMo7-6 Steel","authors":"S. Qin, H. Ma, Lianxiang Wang","doi":"10.5755/j02.ms.30932","DOIUrl":"https://doi.org/10.5755/j02.ms.30932","url":null,"abstract":"The carburizing and quenching process of 18CrNiMo7-6 steel was performed through simulation methods and experiments. The study was carried out to accurately predict the residual stress distribution of carburized samples after the quenching process. The stress and retained-austenite amount were measured via X-ray diffraction. Similarly, the carbon content was determined using a carbon sulfur analyzer, respectively. A detailed model with the coupling of thermal, metallic, and mechanical fields was built to predict the evolution of the stress field during the quenching process. The carburized “thoroughly” specimens at different carbon potentials were used to obtain the required mechanical property parameters and dilatometric parameters for FEM simulation. According to the results, the martensite transformation kinetic parameters α value of 18CrNiMo7-6 alloy steel should be 0.0202. With the increase of carbon content, the changing trend of the transformation plasticity coefficient K appeared as a 'tick' shape. A compressive residual stress field was generated at the carburized layer surface after the quenching process, and the maximum value of 340 MPa occurred at ~ 0.9 mm below the surface. The carbon profile and residual stress fields predicted from the FEM simulation corresponded closely to the experimentally determined results.","PeriodicalId":18298,"journal":{"name":"Materials Science-medziagotyra","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2023-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43294957","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Combinatorial Effects of the Recipes of the Initial Gas-atomized Powder Sizes on Microstructure and Passivation Characteristics of the SLM-ed Ti-6Al-4V Bulk Alloys 初始气体雾化粉末尺寸配方对SLM化Ti-6Al-4V大块合金组织和钝化特性的组合影响

IF 1.1 4区材料科学

Materials Science-medziagotyra Pub Date : 2023-02-24 DOI: 10.5755/j02.ms.31220

Yu Zhang, Jiazhuo Lei, Z. Dan, Hui Chang, Lian Zhou

{"title":"Combinatorial Effects of the Recipes of the Initial Gas-atomized Powder Sizes on Microstructure and Passivation Characteristics of the SLM-ed Ti-6Al-4V Bulk Alloys","authors":"Yu Zhang, Jiazhuo Lei, Z. Dan, Hui Chang, Lian Zhou","doi":"10.5755/j02.ms.31220","DOIUrl":"https://doi.org/10.5755/j02.ms.31220","url":null,"abstract":"Bulk Ti-6Al-4V alloys have been fabricated by selective laser melting (SLM) in three recipes with different combinations of powder sizes. Combinatorial effects of initial gas-atomized powder sizes on microstructure and corrosion properties of SLM-ed Ti-6Al-4V alloys have been investigated by optical microscopy, X-ray diffraction, electrochemical measurements and surface free energy. The SLM-ed Ti-6Al-4V alloys are composed of acicular α' martensite and α phases. Many pinhole defects and twin boundaries exist in the SLM-ed Ti-6Al-4V alloys. According to electrochemical tests and surface free energy calculation, the SLM-ed Ti-6Al-4V alloys with 0 – 53 μm powders have the most positive corrosion potential, the lowest current density and the smallest surface free energy of 20.89 mJ m2. The passive film of SLM-ed Ti-6Al-4V alloys with 0 – 53 μm powders has superior protection ability due to their large thickness. The carrier concentration of SLM-ed Ti-6Al-4V alloys with 0 – 53 μm powders is the lowest by the Mott-Schottky curves. The SLM-ed samples with contact angles higher than 90º are hydrophobic, but the small contact angle of 46.98º reflects the hydrophilic features of as-rolled Ti-6Al-4V alloys. The combinatorial recipe of SLM-ed Ti-6Al-4V alloys with 0 – 53 μm powders is optimal for improvements on the corrosion resistance.","PeriodicalId":18298,"journal":{"name":"Materials Science-medziagotyra","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2023-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47534033","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","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 Nanomaterials Reinforced Aggregate on Mechanical Properties and Microstructure of Recycled Brick Aggregate Concrete 纳米材料增强骨料对再生砖骨料混凝土力学性能和微观结构的影响

IF 1.1 4区材料科学

Materials Science-medziagotyra Pub Date : 2023-02-22 DOI: 10.5755/j02.ms.32715

Ting Wang, Qingshan Wang, Shenao Cui, Haihe Yi, Tian Su, Zhenyu Tan

引用次数: 1

Calcium phosphate brushite cements made from substituted tricalcium phosphate Ca3(PO4)2 and reinforced with silicate glass fiber 由取代的磷酸三钙Ca3（PO4）2制成并用硅酸盐玻璃纤维增强的磷酸钙-刷石水泥

IF 1.1 4区材料科学

Materials Science-medziagotyra Pub Date : 2023-02-21 DOI: 10.31044/1684-579x-2023-0-5-19-27

Sharifjon A Musoev, A. Knotko, Y. Filippov

引用次数: 0

Synthesis of Carboxymethyl Cellulose-Acrylate-OvPOSS Graft Copolymer and its Application in Paper Protection 羧甲基纤维素-丙烯酸酯OvPOSS接枝共聚物的合成及其在纸张防护中的应用

IF 1.1 4区材料科学

Materials Science-medziagotyra Pub Date : 2023-02-13 DOI: 10.5755/j02.ms.29181

Jinjie Zhang, Yingping Qi, Yongfeng Shen, Hua Li

{"title":"Synthesis of Carboxymethyl Cellulose-Acrylate-OvPOSS Graft Copolymer and its Application in Paper Protection","authors":"Jinjie Zhang, Yingping Qi, Yongfeng Shen, Hua Li","doi":"10.5755/j02.ms.29181","DOIUrl":"https://doi.org/10.5755/j02.ms.29181","url":null,"abstract":"As an important part of cultural heritage, paper cultural relics have important historical, scientific and humanistic values. However, a large number of paper cultural relics are suffering from aging, mildew, yellowing, cracks, embrittlement and other threats, or are even completely damaged. To enhance the strength of paper cultural relics and prolong the life of paper cultural relics, a novel CMC-acrylate-OVPOSS graft copolymer was synthesized with carboxymethyl cellulose (CMC), methyl methacrylate (MMA), butyl acrylate (BA), hydroxyethyl methacrylate (HEMA), glycidyl methacrylate (GMA), octavinyl polyhedral oligomeric silsesquioxane (OVPOSS). The synthesized materials were analyzed by infrared spectroscopy, X-ray diffractometer, thermal analyzer and X-ray photoelectron spectroscopy. In addition, the reinforcement solution was coated on the surface of the paper, and the protective effect of the reinforcement solution on the paper was evaluated by testing the mechanical and optical properties of the paper. When the reinforcement solution with a mass concentration of 10 % was coated on the paper, the mechanical properties of the paper were greatly improved, and the gloss and whiteness were basically unchanged.","PeriodicalId":18298,"journal":{"name":"Materials Science-medziagotyra","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2023-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42429516","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Experimental Investigation on Evaporator Surface Modification for Hydrophobicity and Frost Resistance 蒸发器表面改性疏水性和抗冻性的实验研究

IF 1.1 4区材料科学

Materials Science-medziagotyra Pub Date : 2023-02-13 DOI: 10.5755/j02.ms.30986

Xingyuan Liang, Lijun Wu, Zeng Wei

引用次数: 0

The Investigation of Vortex Motion in the YBCO Devices Manufactured Utilizing a Gaussian-shaped Optical Spot from a Continuous-wave Laser 利用连续波激光高斯光斑制造YBCO器件的涡旋运动研究

IF 1.1 4区材料科学

Materials Science-medziagotyra Pub Date : 2023-02-13 DOI: 10.5755/j02.ms.31099

A. Jukna

{"title":"The Investigation of Vortex Motion in the YBCO Devices Manufactured Utilizing a Gaussian-shaped Optical Spot from a Continuous-wave Laser","authors":"A. Jukna","doi":"10.5755/j02.ms.31099","DOIUrl":"https://doi.org/10.5755/j02.ms.31099","url":null,"abstract":"The current report focuses on the analysis of the investigation results of the Abrikosov vortex motion in the YBa2Cu3O7-d (YBCO) device, which is a c-axis textured 0.3 ´ 50 ´ 100 µm3 (thickness ´ width ´ length) stripe of YBCO superconductor deposited on a LaAlO3 substrate. A laser beam focused in a Gaussian-shape optical spot of 5 mm in diameter modifies the stripe, initiating the oxygen out-diffusion and its uneven distribution in illuminated areas and in this way causing the appearance of a higher level of deoxygenation in the spot center and a lower level at its edges (slopes of weak superconductivity region). At temperatures below the temperature of the superconducting transition Tc, the current-self-produced magnetic field penetrates the optically modified area of the stripe in a form of Abrikosov magnetic vortices, and due to the current-self-produced Lorentz force, the vortices move toward their annihilation line resulting in energy dissipation. The vortices pinned on the slopes experience strong pinning and exert a magnetic drag force on moving vortices, which is confirmed by the stepped current-voltage dependences of the YBCO devices measured at temperatures 0.933·Tc £ T £ 0.958·Tc. Our results demonstrate the advantages of partially deoxygenated YBCO material for the development of superconducting electronic devices with electronic properties controlled by the motion of Abrikosov vortices at temperatures below Tc of the superconductor.","PeriodicalId":18298,"journal":{"name":"Materials Science-medziagotyra","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2023-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42035191","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Electrochemical Impedance Spectroscopy Study of Porous Anodic Alumina Films Fabricated at Low Temperature 低温制备多孔阳极氧化铝膜的电化学阻抗谱研究

IF 1.1 4区材料科学

Materials Science-medziagotyra Pub Date : 2023-02-13 DOI: 10.5755/j02.ms.30047

Di Ma, Shuying Li, Xinyu Lyu, Shu-bai Li, Yang Cao

引用次数: 0

Analysis of the Low Service Life of a Planing Knife – A Case Study 刨刀使用寿命低的原因分析——一个案例研究

IF 1.1 4区材料科学

Materials Science-medziagotyra Pub Date : 2023-02-13 DOI: 10.5755/j02.ms.31109

M. Vicen, O. Bokůvka, F. Nový, R. Nikolić, L. Trško, Z. Florková

引用次数: 0