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Acta Materialia Transilvanica最新文献

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Corrosion Testing of Additively Manufactured Metals and Biomedical Devices 增材制造金属和生物医学设备的腐蚀测试
Acta Materialia Transilvanica Pub Date : 2018-10-01 DOI: 10.2478/amt-2018-0028
D. Kemény, D. Károly
{"title":"Corrosion Testing of Additively Manufactured Metals and Biomedical Devices","authors":"D. Kemény, D. Károly","doi":"10.2478/amt-2018-0028","DOIUrl":"https://doi.org/10.2478/amt-2018-0028","url":null,"abstract":"Abstract Additive manufacturing (AM) is becoming increasingly important, making it possible to produce a product in a short time, to specific individual requirements, and even in the presence of the customer. This research is related to direct metal laser sintering of additive manufacturing. This new technology is increasingly being used in more sectors, for example in biomedical industry, where a damaged product can potentially endanger human life. Corrosion tests were carried out during our research. Cyclic voltammetry curves and corrosion rates were determined with a potentiostat. Two typical biocompatible implant materials were compared, a cobalt chromium alloy (powder metallurgy) and a titanium alloy (3D printed). The results will help in specifying the corrosion properties of additively manufactured materials.","PeriodicalId":426392,"journal":{"name":"Acta Materialia Transilvanica","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122519155","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
The Influence of Heat Treatment on the Mechanical Properties of 3D-Printed Cobalt-Chrome Alloy Used in Dental Laboratory Practice 热处理对牙科实验室3d打印钴铬合金力学性能的影响
Acta Materialia Transilvanica Pub Date : 2018-10-01 DOI: 10.2478/amt-2018-0036
K. Kulcsár, J. Kónya
{"title":"The Influence of Heat Treatment on the Mechanical Properties of 3D-Printed Cobalt-Chrome Alloy Used in Dental Laboratory Practice","authors":"K. Kulcsár, J. Kónya","doi":"10.2478/amt-2018-0036","DOIUrl":"https://doi.org/10.2478/amt-2018-0036","url":null,"abstract":"Abstract The material used for manufacturing of dental implantation prostheses is cobalt-chromium alloy. The following study presents a new heat treatment technology for dental implantation prostheses. Specimens were created with the innovative technology of 3D printing. The brittleness of specimens subjected to heat treatment with parameters recommended by the manufacturer made it necessary for us to reconsider the heat-treating process. After changing given heat treatment processes, tensile and hardness tests were performed. From these tests, the optimal heat treatment process technology was chosen.","PeriodicalId":426392,"journal":{"name":"Acta Materialia Transilvanica","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127296761","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
Analysis of Recrystallization Peak Occuring During DSC Measurement DSC测量中再结晶峰的分析
Acta Materialia Transilvanica Pub Date : 2018-10-01 DOI: 10.2478/amt-2018-0024
Gergő Richárd Fejes, V. Gonda, K. Széll
{"title":"Analysis of Recrystallization Peak Occuring During DSC Measurement","authors":"Gergő Richárd Fejes, V. Gonda, K. Széll","doi":"10.2478/amt-2018-0024","DOIUrl":"https://doi.org/10.2478/amt-2018-0024","url":null,"abstract":"Abstract Severe plastic deformation (SPD) is a well-established methodology for the processing of bulk ultrafine grained materials. Among various methods, equal channel angular pressing (ECAP) is the most popular way of creating ultrafine grained materials. The stored energy after ECAP in these substances highly influences the microstructural processes: recovery and recrystallization of the processed materials. We analyzed the recrystallization kinetics of room and elevated temperature ECAP processed copper samples using differential scanning calorimetry (DSC). For the processing of the measurement data we developed a MATLAB processing routine.","PeriodicalId":426392,"journal":{"name":"Acta Materialia Transilvanica","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130223874","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
Comparative Study of Roman Iron Slags Discovered in the Roman Auxiliary Fort and Settlement of Călugăreni 罗马辅助堡与克鲁鲁格鲁雷尼定居点发现的罗马铁渣的比较研究
Acta Materialia Transilvanica Pub Date : 2018-10-01 DOI: 10.2478/amt-2018-0022
E. Bitay, I. Kacso, Sz. Pánczél, E. Veress
{"title":"Comparative Study of Roman Iron Slags Discovered in the Roman Auxiliary Fort and Settlement of Călugăreni","authors":"E. Bitay, I. Kacso, Sz. Pánczél, E. Veress","doi":"10.2478/amt-2018-0022","DOIUrl":"https://doi.org/10.2478/amt-2018-0022","url":null,"abstract":"Abstract Iron slag samples unearthed at the eastern border of Roman Dacia, in the auxiliary fort and the military settlement of Călugăreni (Mikháza) are investigated by macroscopic inspection, optical microscopy (OM) and FTIR spectroscopy in order to comparatively characterize their macro- and microstructure as well as their mineralogical composition. During the recent archaeological excavations, a large number of iron artefacts were discovered together with a great quantity of iron slag fragments. The present paper focuses on the data obtained from 17 slag samples.","PeriodicalId":426392,"journal":{"name":"Acta Materialia Transilvanica","volume":"58 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113979929","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: 1
Thermographic Inspection in the Electric Industry 电气工业中的热成像检测
Acta Materialia Transilvanica Pub Date : 2018-10-01 DOI: 10.2478/amt-2018-0026
F. Haraszti
{"title":"Thermographic Inspection in the Electric Industry","authors":"F. Haraszti","doi":"10.2478/amt-2018-0026","DOIUrl":"https://doi.org/10.2478/amt-2018-0026","url":null,"abstract":"Abstract The traditional inspection of fittings used in the electrical industry is a cumbersome, dangerous process in terms of safety and operation. However, with the spread of thermography, these tests can be performed simpler, faster, and more safely through electrical connections. This article presents the possibilities, measurement difficulties and the advantages of thermography analysis [1-2].","PeriodicalId":426392,"journal":{"name":"Acta Materialia Transilvanica","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116172028","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
Investigation of Laser Welding Technology of Diamond Drilling Segments 金刚石钻段激光焊接技术研究
Acta Materialia Transilvanica Pub Date : 2018-10-01 DOI: 10.2478/amt-2018-0030
A. Kenéz, Gy. Bagyinszki
{"title":"Investigation of Laser Welding Technology of Diamond Drilling Segments","authors":"A. Kenéz, Gy. Bagyinszki","doi":"10.2478/amt-2018-0030","DOIUrl":"https://doi.org/10.2478/amt-2018-0030","url":null,"abstract":"Abstract Segments containing diamond particles are fixed to replaceable inserts or to steel tool bodies for cost-effectiveness. The joining technology used should meet both environmental and technical requirements. The joining zone is subjected to high mechanical and significant thermal loads during use. In the event of an improper joint, the segments may detach from the base and fly away causing injury. Nowadays, many methods of welding or brazing are used to fix diamond segments. Among the possible segment fixing technologies, laser beam welding has been investigated. The microstructure of the joints has been examined by optical and scanning electron microscopy and chemical element maps have been recorded. Joints have been subjected to fracture and hardness testing. The mechanical properties and composition changes of the joints with different joining technologies have been evaluated and compared.","PeriodicalId":426392,"journal":{"name":"Acta Materialia Transilvanica","volume":"400 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127595376","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: 1
The Replacement of Resistance Welding with Laser Beam Welding 用激光束焊接代替电阻焊
Acta Materialia Transilvanica Pub Date : 2018-10-01 DOI: 10.2478/amt-2018-0038
Anna Maloveczky, Ambrus Karai
{"title":"The Replacement of Resistance Welding with Laser Beam Welding","authors":"Anna Maloveczky, Ambrus Karai","doi":"10.2478/amt-2018-0038","DOIUrl":"https://doi.org/10.2478/amt-2018-0038","url":null,"abstract":"Abstract Resistance welding has long been successfully used in the automotive industry, but nowadays, there are even more advanced technologies, such as laser beam welding, which is a much faster, more economical and flexible technology. During our work, we have mapped the possibility of replacing resistance welding with laser beam welding. Furthermore, we have found a solution to the problems occurring during laser beam welding. The biggest challenge in laser beam technology is that the zinc coating on the steel plates (required to prevent corrosion) evaporates during welding, resulting in pores, and leading to a significant reduction in weld strength. We have solved that by using spacer sheets, which allow the zinc vapour to escape from the keyhole.","PeriodicalId":426392,"journal":{"name":"Acta Materialia Transilvanica","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133648478","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: 2
Addictive and Substractive Combined Production of Cobalt-Crome-Based Frames in Dentistry 牙科中钴铬基框架的成瘾性和减法性联合生产
Acta Materialia Transilvanica Pub Date : 2018-10-01 DOI: 10.2478/amt-2018-0032
Kónya János, Kulcsár Klaudia
{"title":"Addictive and Substractive Combined Production of Cobalt-Crome-Based Frames in Dentistry","authors":"Kónya János, Kulcsár Klaudia","doi":"10.2478/amt-2018-0032","DOIUrl":"https://doi.org/10.2478/amt-2018-0032","url":null,"abstract":"Abstract The following study analyses the use of modern 3D printing technology in dentistry with its necessary manufacturing and machining processes. Fitting of the manufactured metal structures is examined depending on their use, in terms of conventional adhesion-based denture designs and screw-fixed dentures on implants. Influencing factors and effects of the required post-processing steps are examined. Aspects such as sand-blasting, heat treatment, equipment and tools required for cutting are analyzed. The aim of this study is to create a manufacturing process that enables the required precision fitting of the created frame structure types.","PeriodicalId":426392,"journal":{"name":"Acta Materialia Transilvanica","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127409474","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
Mechanical Studies of Injection Molded Composites with Polypropilene Matrix 聚丙烯基注射成型复合材料的力学研究
Acta Materialia Transilvanica Pub Date : 2018-10-01 DOI: 10.2478/amt-2018-0040
Ráthy Istvánné, P. Péter, Huszák Csenge
{"title":"Mechanical Studies of Injection Molded Composites with Polypropilene Matrix","authors":"Ráthy Istvánné, P. Péter, Huszák Csenge","doi":"10.2478/amt-2018-0040","DOIUrl":"https://doi.org/10.2478/amt-2018-0040","url":null,"abstract":"Abstract The wide use of composite materials is mainly due to their excellent strength / mass ratio, corrosion resistance and relatively low price. Approximately 35-40% of the fibre-reinforced composites are made of thermoplastic polymers in which fibreglass, carbon or natural fibres are most often used as reinforcement, while the remaining 60 – 65% is made up of high-tech carbon or glass fibre-reinforced thermosetting composites. Most of them are used in the transport and electronics industries. New processing technologies not only improve the properties of the products but also contribute to reducing costs. In this paper, we compare the results of mechanical tests with molded standard specimens with polypropylene matrix and test results from cut-outs from injection molded products.","PeriodicalId":426392,"journal":{"name":"Acta Materialia Transilvanica","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122654961","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
Application of High Energy Absorbing Materials for Blast Protection 高能吸波材料在防爆防护中的应用
Acta Materialia Transilvanica Pub Date : 2018-10-01 DOI: 10.2478/amt-2018-0034
T. Kovács, Zoltán Nyikes, Lucia Figuli
{"title":"Application of High Energy Absorbing Materials for Blast Protection","authors":"T. Kovács, Zoltán Nyikes, Lucia Figuli","doi":"10.2478/amt-2018-0034","DOIUrl":"https://doi.org/10.2478/amt-2018-0034","url":null,"abstract":"Abstract In the current century, building protection is very important in the face of terrorist attacks. The old buildings in Europe are not sufficiently resilient to the loads produced by blasts. We still do not fully understand the effects of different explosives on buildings and human bodies. [1–3] Computing blast loads are different from that of traditional loads and the material selection rules for this type of impact load are diverse. Historical and old buildings cannot be protected simply by new walls and fences. New ways need to be found to improve a building’s resistance to the effects of a blast. It requires sufficiently thin yet strong retrofitted materials in order to reinforce a building’s walls [4–6].","PeriodicalId":426392,"journal":{"name":"Acta Materialia Transilvanica","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121722317","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
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