THE Coatings最新文献_第5页

Wear Characterization of Chromium PVD Coatings on Polymeric Substrate for Automotive Optical Components 汽车光学元件聚合物基板上铬PVD涂层的磨损特性

THE Coatings Pub Date : 2021-05-08 DOI: 10.3390/COATINGS11050555

A. Baptista, G. Pinto, Francisco J. G. Silva, A. Ferreira, A. Pinto, V. Sousa

{"title":"Wear Characterization of Chromium PVD Coatings on Polymeric Substrate for Automotive Optical Components","authors":"A. Baptista, G. Pinto, Francisco J. G. Silva, A. Ferreira, A. Pinto, V. Sousa","doi":"10.3390/COATINGS11050555","DOIUrl":"https://doi.org/10.3390/COATINGS11050555","url":null,"abstract":"The automotive industry is a pioneer in solutions that meet market expectations. However, in the automotive industry, some less environmentally friendly technologies are still used, such as electroplating. Due to legislative restrictions in several countries, thin coatings made in a vacuum have been replacing coatings traditionally made by electroplating, mainly in decorative terms. This work is more focused on the use of these coatings made in vacuum for optical applications, namely on headlights and exterior backlit components. Although these components are protected during the period of use, there may be situations of contact during the assembly of the components or their repair, necessary to safeguard and to ensure that these coatings have the scratch and wear resistance needed to withstand any treatment deficiency during the operations referred to above. Therefore, this work is essentially focused on the study of the wear resistance of Cr coatings made by PVD (Physical Vapour Deposition) on polymeric substrates. To this end, the coatings previously studied have now been subjected to micro-abrasion tests, with a view to assessing their wear resistance. For this purpose, alumina abrasive has been used, and the wear mechanisms observed in the coatings were studied. The abrasion and scratch tests showed that the most stable film has the one provided with 10-layers, showing greater wear resistance as well, greater adhesion to the substrate and less cohesive failures in the performed tests. Given the nature of the substrate and the coating, the results obtained are very promising, showing that these 10-layer Cr thin coatings can overcome any careless operation during manufacturing, assembly and repair processes, when applied in lightning or backlit components in motor vehicles.","PeriodicalId":22482,"journal":{"name":"THE Coatings","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84441180","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: 15

Effect of Carrier Gas Flow Field on Chemical Vapor Deposition of 2D MoS2 Crystal 载气流场对化学气相沉积二维二硫化钼晶体的影响

THE Coatings Pub Date : 2021-05-06 DOI: 10.3390/COATINGS11050547

Minyu Bai, Shuai Wen, Jijie Zhao, Yuxuan Du, Fei Xie, Huan Liu

引用次数: 2

Tire/Road Rolling Resistance Modeling: Discussing the Surface Macrotexture Effect 轮胎/道路滚动阻力建模:讨论表面宏观纹理效应

THE Coatings Pub Date : 2021-05-02 DOI: 10.3390/COATINGS11050538

M. Kane, Ebrahim Riahi, M. Do

{"title":"Tire/Road Rolling Resistance Modeling: Discussing the Surface Macrotexture Effect","authors":"M. Kane, Ebrahim Riahi, M. Do","doi":"10.3390/COATINGS11050538","DOIUrl":"https://doi.org/10.3390/COATINGS11050538","url":null,"abstract":"This paper deals with the modeling of rolling resistance and the analysis of the effect of pavement texture. The Rolling Resistance Model (RRM) is a simplification of the no-slip rate of the Dynamic Friction Model (DFM) based on modeling tire/road contact and is intended to predict the tire/pavement friction at all slip rates. The experimental validation of this approach was performed using a machine simulating tires rolling on road surfaces. The tested pavement surfaces have a wide range of textures from smooth to macro-micro-rough, thus covering all the surfaces likely to be encountered on the roads. A comparison between the experimental rolling resistances and those predicted by the model shows a good correlation, with an R2 exceeding 0.8. A good correlation between the MPD (mean profile depth) of the surfaces and the rolling resistance is also shown. It is also noticed that a random distribution and pointed shape of the summits may also be an inconvenience concerning rolling resistance, thus leading to the conclusion that beyond the macrotexture, the positivity of the texture should also be taken into account. A possible simplification of the model by neglecting the damping part in the constitutive model of the rubber is also noted.","PeriodicalId":22482,"journal":{"name":"THE Coatings","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75012425","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: 4

Microstructural and Erosive Wear Characteristics of a High Chromium Cast Iron 高铬铸铁的显微组织和冲蚀磨损特性

THE Coatings Pub Date : 2021-05-01 DOI: 10.3390/COATINGS11050490

A. Fortini, A. Suman, Alessandro Vulpio, M. Merlin, M. Pinelli

{"title":"Microstructural and Erosive Wear Characteristics of a High Chromium Cast Iron","authors":"A. Fortini, A. Suman, Alessandro Vulpio, M. Merlin, M. Pinelli","doi":"10.3390/COATINGS11050490","DOIUrl":"https://doi.org/10.3390/COATINGS11050490","url":null,"abstract":"Surface material loss due to erosive wear is responsible for the increased cost of maintenance and downtime in industries. Hence, hardfacing is one of the most valuable and effective techniques employed to improve the wear resistance of heavy-duty components. The present paper investigates the microstructural and erosive wear characteristics of a hypereutectic high-chromium cast iron, considering the erosion resistance, resulting from the impact of micro-sized particles, of both as-received and heat-treated conditions. Micro-sized particles involve the erosion-resistant characteristics of carbide and matrix, contemporary. Due to this, the enhancement of the matrix strength could improve the mechanical support to withstand cracking deformation and spalling. Accordingly, the effect of a destabilization heat treatment on the microstructure was firstly investigated by hardness tests, X-ray diffraction analyses, optical and scanning electron microscopy. Specifically designed erosive tests were carried out using a raw meal powder at an impingement angle of 90°. The resulting superior wear resistance of the heat-treated samples was relayed on the improved matrix microstructure: consistent with the observed eroded surfaces, the reduced matrix/carbides hardness difference of the heat-treated material is pivotal in enhancing the erosion resistance of the hardfacing. The present results contribute to a better understanding of the microstructure–property relationships concerning the erosive wear resistance.","PeriodicalId":22482,"journal":{"name":"THE Coatings","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81675882","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: 8

Synthesis of Cubic Aluminum Nitride (AlN) Coatings through Suspension Plasma Spray (SPS) Technology 悬浮等离子喷涂技术合成立方氮化铝(AlN)涂层

THE Coatings Pub Date : 2021-05-01 DOI: 10.3390/COATINGS11050500

F. Barandehfard, J. Aluha, F. Gitzhofer

{"title":"Synthesis of Cubic Aluminum Nitride (AlN) Coatings through Suspension Plasma Spray (SPS) Technology","authors":"F. Barandehfard, J. Aluha, F. Gitzhofer","doi":"10.3390/COATINGS11050500","DOIUrl":"https://doi.org/10.3390/COATINGS11050500","url":null,"abstract":"Thermal spraying of aluminum nitride (AlN) is a challenging issue because it decomposes at a high temperature. In this work, the use of suspension plasma spray (SPS) technology is proposed for the in situ synthesis and deposition of cubic-structured AlN coatings on metallic substrates. The effects of the nitriding agent, the suspension liquid carrier, the substrate materials and the standoff distance during deposition by SPS were investigated. The plasma-synthesized coatings were analyzed by X-ray diffraction (XRD), optical microscopy (OM) and scanning electron microscopy (SEM). The results show higher AlN content in the coatings deposited on a carbon steel substrate (~82%) when compared to titanium substrate (~30%) or molybdenum (~15%). Melamine mixed with pure aluminum powder produced AlN-richer coatings of up to 82% when compared to urea mixed with the Al (~25% AlN). Hexadecane was a relatively better liquid carrier than the oxygen-rich liquid carriers such as ethanol or ethylene glycol. When the materials were exposed to a molten aluminum–magnesium alloy at 850 °C for 2 h, the corrosion resistance of the AlN-coated carbon steel substrate showed improved performance in comparison to the uncoated substrate.","PeriodicalId":22482,"journal":{"name":"THE Coatings","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74161715","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: 6

Curcumin: Modern Applications for a Versatile Additive 姜黄素:一种多功能添加剂的现代应用

THE Coatings Pub Date : 2021-04-28 DOI: 10.3390/COATINGS11050519

Florentina Monica Raduly, V. Rădițoiu, Alina Raditoiu, V. Purcar

{"title":"Curcumin: Modern Applications for a Versatile Additive","authors":"Florentina Monica Raduly, V. Rădițoiu, Alina Raditoiu, V. Purcar","doi":"10.3390/COATINGS11050519","DOIUrl":"https://doi.org/10.3390/COATINGS11050519","url":null,"abstract":"The recent development of several methods for extracting curcumin from the root of the plant Curcuma longa has led to intensified research on the properties of curcumin and its fields of application. Following the studies and the accreditation of curcumin as a natural compound with antifungal, antiviral, and antibacterial properties, new fields of application have been developed in two main directions—food and medical, respectively. This review paper aims to synthesize the fields of application of curcumin as an additive for the prevention of spoilage, safety, and quality of food. Simultaneously, it aims to present curcumin as an additive in products for the prevention of bacterial infections and health care. In both cases, the types of curcumin formulations in the form of (nano)emulsions, (nano)particles, or (nano)composites are presented, depending on the field and conditions of exploitation or their properties to be used. The diversity of composite materials that can be designed, depending on the purpose of use, leaves open the field of research on the conditioning of curcumin. Various biomaterials active from the antibacterial and antibiofilm point of view can be intuited in which curcumin acts as an additive that potentiates the activities of other compounds or has a synergistic activity with them.","PeriodicalId":22482,"journal":{"name":"THE Coatings","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80822761","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: 23

Efficient Light Trapping from Nanorod-Like Single-Textured Al-Doped ZnO Transparent Conducting Films 纳米棒状单织构al掺杂ZnO透明导电膜的高效光捕获

THE Coatings Pub Date : 2021-04-27 DOI: 10.3390/COATINGS11050513

Jiang Zhu, Daqiang Hu, Ying Wang, Chunlei Tao, Hongbao Jia, Wenping Zhao

引用次数: 5

Microstructure and Wear Behaviors of Plasma-Sprayed MoAlB Ceramic Coating 等离子喷涂MoAlB陶瓷涂层的微观结构与磨损行为

THE Coatings Pub Date : 2021-04-18 DOI: 10.3390/COATINGS11040474

Fuzhu Li, Shengnan Sun, Yonglong Xu, L. Tian, Yun Wang, Zhenying Xu, Ruitao Li

引用次数: 3

Reliable Ohmic Contact Properties for Ni/Hydrogen-Terminated Diamond at Annealing Temperature up to 900 °C 在高达900°C的退火温度下，Ni/氢气端接金刚石可靠的欧姆接触特性

THE Coatings Pub Date : 2021-04-17 DOI: 10.3390/COATINGS11040470

Xiaolu Yuan, Jiangwei Liu, Jinlong Liu, Junjun Wei, B. Da, Chengming Li, Y. Koide