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THERMAL-POWER-PLANT CONDENSER-TUBE CORROSION ANALYSIS 热电厂冷凝器管腐蚀分析
IF 0.5 4区 材料科学
Materiali in tehnologije Pub Date : 2023-07-28 DOI: 10.17222/mit.2023.747
J. Batelić, V. Špada, M. Kršulja, S. Martinez
{"title":"THERMAL-POWER-PLANT CONDENSER-TUBE CORROSION ANALYSIS","authors":"J. Batelić, V. Špada, M. Kršulja, S. Martinez","doi":"10.17222/mit.2023.747","DOIUrl":"https://doi.org/10.17222/mit.2023.747","url":null,"abstract":"The thermal-power-plant condenser tubes, conducting cooling seawater, experienced frequent leakages, prompting the hereby presented failure analysis. Visual inspection of the corroded/ruptured tube segments revealed that localized corrosion may be linked to seawater sediments and thick layers of corrosion products at the tube water side. Sediments were found along the tube bottom and thick corrosion products were found adjacent to the point of contact between the baffle plates and the exterior tube walls. Underdeposit corrosion, accelerated due to sulphate-reducing bacteria, was diagnosed based on the excess sulphur found at the pit bottom using EDX, the FT-IR spectrum indicating the presence of biofilm and SEM determining the featuring corrosion products based on the biofilm. It was proposed that the corrosion initiating deposits were linked to the condenser shutdown and startup periods. Results showed that pitting corrosion occurred under the influence of biofilm microorganisms tolerant to copper. The main goal of this research was achieved by defining a systematic procedure for avoiding a shutdown of the thermal power plant.","PeriodicalId":18258,"journal":{"name":"Materiali in tehnologije","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2023-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72662467","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
DESIGN OF A TRIPLE-BANDPASS FILTER USING A MODIFIED T-SHAPED RECTANGULAR COUPLED WITH A STEPPED IMPEDANCE RESONATOR FOR SMART PORTABLE COMMUNICATION DEVICE APPLICATIONS 采用改进的t形矩形耦合阶跃阻抗谐振器设计用于智能便携式通信设备的三带通滤波器
IF 0.5 4区 材料科学
Materiali in tehnologije Pub Date : 2023-07-28 DOI: 10.17222/mit.2023.846
M. Arulaalan, Viswanathan Ramasamy, R. Saravanakumar, S. Maheswari
{"title":"DESIGN OF A TRIPLE-BANDPASS FILTER USING A MODIFIED T-SHAPED RECTANGULAR COUPLED WITH A STEPPED IMPEDANCE RESONATOR FOR SMART PORTABLE COMMUNICATION DEVICE APPLICATIONS","authors":"M. Arulaalan, Viswanathan Ramasamy, R. Saravanakumar, S. Maheswari","doi":"10.17222/mit.2023.846","DOIUrl":"https://doi.org/10.17222/mit.2023.846","url":null,"abstract":"This paper presents a ground-breaking triple-bandpass filter design utilizing a modified T-shape rectangular coupled with a stepped impedance resonator (MTSR-CSIR) for smart portable communication device applications. The MTSR-CSIR filter operates at (2.2, 3.62 and 4.6) GHz, providing wide passbands in three operating modes. To achieve the optimal performance, the filter design is executed on a multi-layered liquid-crystal polymer (LCP) substrate with a thickness of 50 µm, dielectric constant of 2.9 and loss tangent of 0.002. Simulation results for the MTSR-CSIR filter demonstrate a high level of accuracy and consistency with the measurement results for the fabricated filter. The filter exhibits an excellent stopband rejection, low loss and compact size while maintaining high-performance levels. Its performance parameters, such as insertion loss, return loss and group delay, are considered to evaluate the filter’s performance. The results highlight the applicability of the MTSR-CSIR filter for smart portable communication devices.","PeriodicalId":18258,"journal":{"name":"Materiali in tehnologije","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2023-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75812511","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
A CONTEMPORARY REVIEW OF THE ADVANCEMENTS IN JOINING TECHNOLOGIES FOR BATTERY APPLICATIONS 电池应用中连接技术的当代进展综述
IF 0.5 4区 材料科学
Materiali in tehnologije Pub Date : 2023-05-31 DOI: 10.17222/mit.2023.797
R. Palanivel
{"title":"A CONTEMPORARY REVIEW OF THE ADVANCEMENTS IN JOINING TECHNOLOGIES FOR BATTERY APPLICATIONS","authors":"R. Palanivel","doi":"10.17222/mit.2023.797","DOIUrl":"https://doi.org/10.17222/mit.2023.797","url":null,"abstract":"The joining of multilayered foils to a conductive tab necessitates a joining process in the battery, which is an important storage device in renewable-energy sectors. Cell, module, and pack are the three levels of pouch cell joining in a battery pack. The joining of multi-layered dissimilar conductive materials is necessary for battery-pack fabrication. Mostly copper (Cu) and aluminium (Al) are used in battery-pack applications. The Cu and Al are characterized as high thermally and electrically conductive materials. However, obtaining a quality Cu-Al weld using conventional methods is hard and the durability of the weldments is uncertain. In general, the development of intermetallic compounds (IMCs) during welding is a major challenge for the joining of dissimilar materials due to the differences in the chemical and physical properties. This review addresses the battery packs and challenges involved in joining the conductive tabs. In addition, this review provides an insight into the suitability of various joining processes and explores their suitability for the joining of battery packs. \u0000 ","PeriodicalId":18258,"journal":{"name":"Materiali in tehnologije","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2023-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90269456","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
INJECTION MOLDING OF POLYCARBONATE THICK-WALLED PARTS USING A TOOL WITH VARIOUSLY DESIGNED GATE INSERTS 注塑成型的聚碳酸酯厚壁零件使用的工具与各种设计的浇口插入
IF 0.5 4区 材料科学
Materiali in tehnologije Pub Date : 2023-05-31 DOI: 10.17222/mit.2022.692
Jiri Vanek, Michal Stanek, M. Ovsik, Vlastimil Chalupa
{"title":"INJECTION MOLDING OF POLYCARBONATE THICK-WALLED PARTS USING A TOOL WITH VARIOUSLY DESIGNED GATE INSERTS","authors":"Jiri Vanek, Michal Stanek, M. Ovsik, Vlastimil Chalupa","doi":"10.17222/mit.2022.692","DOIUrl":"https://doi.org/10.17222/mit.2022.692","url":null,"abstract":"Injection molding is an advantageous technology for the mass production of plastic parts without the necessity for additional procedures. The applicability of this method is still partially limited by the required properties of the manufactured parts. Especially in the field of optics, there is a need to produce thick-walled parts while maintaining their transparency. This paper reports on how various shapes of gating systems affected the process parameters and cavity filling during the injection molding of polycarbonate thick-walled specimens. These outcomes demonstrated that film gates and their alternatives are more suitable for the standard injection molding of thick-walled optical products than the triple-edge gating systems. Favorable results were observed particularly in the uniformity of cavity filling, size of shrinkage, and in the occurrence of defects such as voids or sink marks.","PeriodicalId":18258,"journal":{"name":"Materiali in tehnologije","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2023-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74602448","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 ALLOYING ELEMENTS AND SURFACE PROPERTIES ON THE CORROSION BEHAVIOR OF HVOF-DEPOSITED WC COATINGS 合金元素和表面性能对高温沉积wc涂层腐蚀行为的影响
IF 0.5 4区 材料科学
Materiali in tehnologije Pub Date : 2023-05-31 DOI: 10.17222/mit.2023.833
Erhan Ozkan
{"title":"EFFECTS OF ALLOYING ELEMENTS AND SURFACE PROPERTIES ON THE CORROSION BEHAVIOR OF HVOF-DEPOSITED WC COATINGS","authors":"Erhan Ozkan","doi":"10.17222/mit.2023.833","DOIUrl":"https://doi.org/10.17222/mit.2023.833","url":null,"abstract":"The main purpose of this study is to investigate the corrosion behavior of nickel-aluminum buffer and tungsten-carbide-based ceramic-metal composite coated materials on EN 1.4404 quality stainless steels in a sulfuric acid (H2SO4) environment for petrochemical industry applications. For this purpose, tungsten-carbide-based coatings were produced on nickel-aluminum-deposited 1.4404 stainless-steel substrates using the HVOF (High Velocity Oxy-Fuel) technique. In the characterization of coatings, X-ray diffraction (XRD) for phase analysis, optical microscope and scanning electron microscope (SEM) for surface morphology, image analyzer for coating thickness measurements, energy distribution spectroscopy (EDS) for elemental analysis, and roughness device for surface structures, were used. WC-, Co-, Ni-, and NiAl-based phases were observed in the coatings. According to metallographic studies, all the coatings had a similar coating microstructure and made good contact with the substrate. Potentiodynamic polarization measurements and corrosion tests were carried out to determine the corrosion behavior of HVOF plasma-sprayed coatings using a potentiostat/galvanostat. The results showed that the WCCo-NiAl-coated stainless-steel substrate had a higher corrosion resistance to the H2SO4 environment than the NiAl and WCNi-NiAl samples.","PeriodicalId":18258,"journal":{"name":"Materiali in tehnologije","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2023-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73791149","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
DEVELOPMENT OF A PNEUMATIC, ARTIFICIAL-MUSCLE- BASED PRESS FOR PUNCHING THIN METAL SHEETS 一种用于冲压金属薄板的气动、人造肌肉式压力机的研制
IF 0.5 4区 材料科学
Materiali in tehnologije Pub Date : 2023-05-31 DOI: 10.17222/mit.2023.783
A. Kapti, Ilker Atakul
{"title":"DEVELOPMENT OF A PNEUMATIC, ARTIFICIAL-MUSCLE- BASED PRESS FOR PUNCHING THIN METAL SHEETS","authors":"A. Kapti, Ilker Atakul","doi":"10.17222/mit.2023.783","DOIUrl":"https://doi.org/10.17222/mit.2023.783","url":null,"abstract":"The present study examines the nonlinear behavior of pneumatic, artificial muscles and investigates their availability for producing pressing forces over the experimentally determined tensile forces. It covers the design and manufacturing studies of a test setup and a pneumatic, artificial-muscle-based press to achieve this goal. The press design consists of a single pneumatic artificial muscle to provide the main pressing force and another two to bring the press back to the neutral position. The proposed approach is considered sufficient for thin sheet-metal punching molds and fills a gap in the spectrum of pressing technologies. A sufficient level of pressing force for thin sheet-metal punching is found to be achievable using a single 40-mm-diameter, pneumatic, artificial muscle. The results show that the press can produce (9.1, 23.1 and 36.9) kN pressing forces at (200, 400 and 600) kPa air pressures, respectively.","PeriodicalId":18258,"journal":{"name":"Materiali in tehnologije","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2023-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86193257","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
DRY SLIDING WEAR BEHAVIOUR OF AZ31/ZrO2 COMPOSITES PRODUCED USING A STIR CASTING PROCESS 搅拌铸造AZ31/ZrO2复合材料的干滑动磨损性能
IF 0.5 4区 材料科学
Materiali in tehnologije Pub Date : 2023-05-31 DOI: 10.17222/mit.2022.543
K. K. Basha, R. Subramanian, T. Satish Kumar, G. Suganya Priyadharshini
{"title":"DRY SLIDING WEAR BEHAVIOUR OF AZ31/ZrO2 COMPOSITES PRODUCED USING A STIR CASTING PROCESS","authors":"K. K. Basha, R. Subramanian, T. Satish Kumar, G. Suganya Priyadharshini","doi":"10.17222/mit.2022.543","DOIUrl":"https://doi.org/10.17222/mit.2022.543","url":null,"abstract":"This study investigates the effect of ZrO2 reinforcement (5, 10 and 15)  vol.% on the dry sliding wear behaviour of AZ31 Mg alloy composites produced using stir casting. The wear test (pin on disc) was conducted at different loads of (10, 20, 30 and 40) N and sliding velocities of (1, 3 and 5) m/s. The variation in the wear rate and friction co-efficient with the change in the load at a constant sliding distance was determined. Results showed that the composites exhibited a lower wear rate at higher loads and speeds compared to the AZ31 alloy. In particular, AZ31-15  vol.% ZrO2 composite showed the lowest wear rate and friction coefficient. Different wear mechanisms operating during the wear test were investigated using SEM and XRD. \u0000 ","PeriodicalId":18258,"journal":{"name":"Materiali in tehnologije","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2023-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82898278","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
BIO-PRINTING OF FEMUR MODEL: A BONE SUBSTITUTE FOR BIOMEDICAL RESEARCH 生物打印股骨模型:生物医学研究的骨替代品
IF 0.5 4区 材料科学
Materiali in tehnologije Pub Date : 2023-05-31 DOI: 10.17222/mit.2023.831
A. Vasanthanathan, Senthil Maharaj Ramesh Kennedy
{"title":"BIO-PRINTING OF FEMUR MODEL: A BONE SUBSTITUTE FOR BIOMEDICAL RESEARCH","authors":"A. Vasanthanathan, Senthil Maharaj Ramesh Kennedy","doi":"10.17222/mit.2023.831","DOIUrl":"https://doi.org/10.17222/mit.2023.831","url":null,"abstract":"This paper deals with the development of a medical support model that can be used as a prototype to study the anatomy of the femur and for biomechanical research experimentation related to bone plates. CT scan data of the femur bone are converted into a 3D model using MIMICS software and imported into a finite-element model for analysis. The materials selected for the fabrication of the femur model were PEEK and CF PEEK (infused with chopped carbon fibre). The femur bone model was analysed using ANSYS® WORKBENCH® 2021 R2 with different material properties. By conducting a subsequent FE analysis, the optimal material was finally arrived at. Using 3D-printing technology, the 3D model of the femur was fabricated by using a material spool with better properties suited for the femur bone. The FE results were compared with the experimental results of the fabricated femur model and the results of the CF PEEK bone model closely matched the properties of real human femur, and it can be used as a femur bone substitute for biomechanical investigations of bone plates instead of using a real femur.","PeriodicalId":18258,"journal":{"name":"Materiali in tehnologije","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2023-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78805298","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: 2
STUDY OF DROPLET TRANSFER CHARACTERISTICS AND WELD FORMATION WITH ER430LNb FERRITIC STAINLESS STEEL DURING GAS METAL ARC WELDING ER430LNb铁素体不锈钢气体保护焊熔滴传递特性及焊缝成形研究
IF 0.5 4区 材料科学
Materiali in tehnologije Pub Date : 2023-05-30 DOI: 10.17222/mit.2022.697
Fengde Liu, Yu Gu, Fan Xu, H. Zhang, Shaowei Xu, Zhihang Yan, Zhifeng Yan, Wen-xian Wang
{"title":"STUDY OF DROPLET TRANSFER CHARACTERISTICS AND WELD FORMATION WITH ER430LNb FERRITIC STAINLESS STEEL DURING GAS METAL ARC WELDING","authors":"Fengde Liu, Yu Gu, Fan Xu, H. Zhang, Shaowei Xu, Zhihang Yan, Zhifeng Yan, Wen-xian Wang","doi":"10.17222/mit.2022.697","DOIUrl":"https://doi.org/10.17222/mit.2022.697","url":null,"abstract":"An ER430LNb ferritic stainless steel wire was used for a gas metal arc welding (GMAW) test. The characteristics of droplet transfer and its corresponding voltage and current waveforms were investigated using a high-speed camera and synchronous acquisition of electrical signals. The weld formation, droplet transfer patterns and corresponding microstructures under different welding parameters were observed, and the effect of the current level on the droplet transfer frequency was discussed. As the results show, there were three typical metal transfer patterns during the GMAW using the ER430LNb ferritic stainless steel wire, namely short circuit transfer, mix transfer and spray transfer. With an increase in the welding current, the weld formation is changing constantly, and the droplet transfer frequency increases exponentially. With the change in the transfer pattern, the columnar ferrite structure of the weld is continuously coarsening. In addition, hardness measurements were taken on joints welded at different welding currents for comparison.","PeriodicalId":18258,"journal":{"name":"Materiali in tehnologije","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2023-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90796229","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
FAILURE ANALYSIS OF CARBIDE TWIST-DRILL BIT FOR SMALL-SCALE GRANITE DRILLING 小型花岗岩钻头用硬质合金麻花钻头失效分析
IF 0.5 4区 材料科学
Materiali in tehnologije Pub Date : 2023-05-30 DOI: 10.17222/mit.2023.702
Saurabh Dewangan, J. Burja
{"title":"FAILURE ANALYSIS OF CARBIDE TWIST-DRILL BIT FOR SMALL-SCALE GRANITE DRILLING","authors":"Saurabh Dewangan, J. Burja","doi":"10.17222/mit.2023.702","DOIUrl":"https://doi.org/10.17222/mit.2023.702","url":null,"abstract":"This paper deals with a failure analysis of WC-Co carbide-based twist drills used for small-scale granite drilling. A bench-top drill was used for this study. The aim of the study was to analyse a simulated in-situ rock-drilling operation normally carried out in mines. After a drilling time of 15 minutes, the drills were examined using scanning electron microscopy. On macroscopic observation, both cutting edges of the drills showed slight signs of abrasion, but these were not significant. The chisel edge was also abraded and showed some macroscopic abrasion marks. The electron micrographs showed various signs of decomposition at the micro and nano levels, including cracks in the WC grains, cavities in the grains, Co-binder erosion and some heavy abrasion marks. In addition, some parts of the carbide grains were covered with a thin layer of rock. The wear analysis is an important approach to understanding exactly the damage behaviour of the tool so that the material composition can be changed to avoid premature tool failure.","PeriodicalId":18258,"journal":{"name":"Materiali in tehnologije","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2023-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82671335","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
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