Materials Sciences and Applications最新文献

Exploring the Friction and Wear Properties of Silver Coatings on 718 Alloy 718合金镀银层摩擦磨损性能的研究

Materials Sciences and Applications Pub Date : 2023-01-01 DOI: 10.4236/msa.2023.1410031

Rongrong Luo, Pengyuan Li, Teng Zhang, Tengfei Yan, Min Dan

{"title":"Exploring the Friction and Wear Properties of Silver Coatings on 718 Alloy","authors":"Rongrong Luo, Pengyuan Li, Teng Zhang, Tengfei Yan, Min Dan","doi":"10.4236/msa.2023.1410031","DOIUrl":"https://doi.org/10.4236/msa.2023.1410031","url":null,"abstract":"Fasteners of 718 alloys are used to set up connection between each support and other components for ITER system, metal-based Ag solid lubricant coating is widely used as an anti-seizure lubricant coating due to its strong low-temperature shear resistance. But the poor adhesion to the steel surfaces has been a critical restriction for applying the silver coatings to the practical machine elements. In this work, an 8-μm silver self-lubricating coating was deposited on the surface of 718 alloy by the method of magnetron sputtering. The coating was uniform, dense and consistent. The wear mechanism was investigated by analyzing the friction and wear properties of the coating. Stress is one of the important impacts on the friction coefficient, the results showed that it first increased and then decreased with the increase of pressure at room temperature and under vacuum. Temperature exerted an effect on the silver self-lubricating coating. A study was conducted under vacuum on the friction and wear performance of the coating at 300 K, 225 K, 155 K, and 77 K, respectively. The results showed that the wear mechanism and wear state varied under various low-temperature conditions, with the severity of wear reaching the maximum only at 225 K. Through the same silver coating process, the washer of superbolt was improved by silver coating treatment.","PeriodicalId":18454,"journal":{"name":"Materials Sciences and Applications","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136208398","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

Synthesis and Characterization of Aluminum Alloys with Metal Oxides (CuO<sub>2</sub>) Additions as Reinforcement 含金属氧化物铝合金的合成与表征(CuO<sub>2</sub>)添加物作为强化物

Materials Sciences and Applications Pub Date : 2023-01-01 DOI: 10.4236/msa.2023.148027

Reyna Anahí Falcón-Castrejón, Jose Luis Román-Zubillaga, Rene Guardián-Tapia, Lazaro Falcón-Franco, Isaí Rosales-Cadena

引用次数: 0

Evaluation of Reactive Oxygen Species (ROS) Generated on the Surface of Copper Using Chemiluminesence 化学发光法评价铜表面活性氧(ROS)的生成

Materials Sciences and Applications Pub Date : 2023-01-01 DOI: 10.4236/msa.2023.1410032

Ken Hirota, Hiroya Tanaka, Taika Maeda, Kazuhiko Tsukagoshi, Hiroshi Kawakami, Takashi Ozawa, Masahiko Wada

{"title":"Evaluation of Reactive Oxygen Species (ROS) Generated on the Surface of Copper Using Chemiluminesence","authors":"Ken Hirota, Hiroya Tanaka, Taika Maeda, Kazuhiko Tsukagoshi, Hiroshi Kawakami, Takashi Ozawa, Masahiko Wada","doi":"10.4236/msa.2023.1410032","DOIUrl":"https://doi.org/10.4236/msa.2023.1410032","url":null,"abstract":"The antibacterial activity of copper is well-known from an ancient civilization, however, its biocidal mechanism has not been necessarily elucidated. Notwithstanding up to now, mainly 4 processes have been proposed. Among them, it is cleared that 4 kinds of reactive oxygen species (ROS): hydroxyl radical ·OH, hydrogen per oxide H2O2, superoxide anion ·O-2 and singlet oxygen 1O2, play an important role for contact-killing of bacteria, viruses and fungi. In this paper, generation of ROS on the surfaces of copper plates heated from room temperature to 673 K for 4.2 × 102 s in air, was investigated using the chemiluminescence. ROS have been evaluated by selecting the most suitable scavengers, such as 2-propanol for ·OH, sodium pyruvate for H2O2, nitro blue tetrazolium for ·O-2, and sodium azide NaN3 for 1O2. At the same time the outermost surface of copper, on which thin film of cuprous oxide Cu2O was first formed and then cupric oxide CuO was laminated on Cu2O, was examined by thin-film XRD and TEM analysis to estimate the amounts and kinds of copper oxides. It was found that the most amounts of ROS were obtained for the 573 K-heated Cu plate and they were composed of ·OH, H2O2, and ·O-2.","PeriodicalId":18454,"journal":{"name":"Materials Sciences and Applications","volume":"135 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136208414","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

Corrosion Behaviour of Zr-Ag Alloys for Dental Implant Application 种植牙用Zr-Ag合金的腐蚀行为

Materials Sciences and Applications Pub Date : 2023-01-01 DOI: 10.4236/msa.2023.1411033

Francesco Rosalbino, Daniele Macciò, Giorgio Scavino

引用次数: 0