Materiali in tehnologije最新文献_第2页

EVALUATION OF THE MAGNETIC PROPERTIES OF Ag-Au-Pd-Cu DENTAL ALLOYS 银-金-钯-铜牙科合金磁性能的评估

IF 0.5 4区材料科学

Materiali in tehnologije Pub Date : 2024-04-03 DOI: 10.17222/mit.2024.1126

L. Gusel, P. Majerič, Mirko Glišić, Aleksandra Kocijan, Rebeka Rudolf

{"title":"EVALUATION OF THE MAGNETIC PROPERTIES OF Ag-Au-Pd-Cu DENTAL ALLOYS","authors":"L. Gusel, P. Majerič, Mirko Glišić, Aleksandra Kocijan, Rebeka Rudolf","doi":"10.17222/mit.2024.1126","DOIUrl":"https://doi.org/10.17222/mit.2024.1126","url":null,"abstract":"The paper discusses four Ag-Au-Pd-Cu dental alloys, with different chemical compositions, which are used to produce fixed dental-prosthetic structures. These dental alloys must have a low level of biological risk after being implanted in the oral cavity, which means minimal release of ions from their surface, or the absence of corrosion, and, recently, the absence of ferromagnetism has been introduced as an additional requirement. The latter requirement is particularly important when magnetic resonance (MR) is used in the medical diagnosis of a patient who has an implanted fixed dental-prosthetic structure. With this technique, the internal structure of the human body is imaged using a strong magnetic field, radio waves and computer technology. Therefore, the absence of ferromagnetic, embedded biomaterials is necessary in the part of the body where medical diagnostics are performed. Microstructural investigations of four Ag-Au-Pd-Cu dental alloys (Auropal S, Auropal SE, Midor S and Midor SE) and measurements of their magnetic properties were carried out as part of the research. The results showed that Ag-Au-Pd-Cu dental alloys have a stable microstructure, which allows them to be processed later into fixed prosthetic constructions. The measurements of the magnetic properties showed that the Ag-Au-Pd-Cu dental alloys are diamagnetic.","PeriodicalId":18258,"journal":{"name":"Materiali in tehnologije","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2024-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140746401","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 SIMPLE STRUCTURED MULTIBAND TERAHERTZ METAMATERIAL ABSORBER WITH A HIGH Q FACTOR 具有高 Q 因子的简单结构多频带太赫兹超材料吸收器

IF 0.5 4区材料科学

Materiali in tehnologije Pub Date : 2024-04-03 DOI: 10.17222/mit.2023.1040

D. S.

引用次数: 0

A NOVEL HYBRID DECISION-MAKING MODEL: FUZZY AHP-TOPSIS APPROACH FOR PRIORITISING COPPER SMELTING PROCESSES 一种新型混合决策模型：确定铜冶炼工艺优先次序的模糊 AHP-Topsis 方法

IF 0.5 4区材料科学

Materiali in tehnologije Pub Date : 2024-04-02 DOI: 10.17222/mit.2023.1037

Ivica Nikolić, Anđelka Stojanović, Milijana Mitrović

{"title":"A NOVEL HYBRID DECISION-MAKING MODEL: FUZZY AHP-TOPSIS APPROACH FOR PRIORITISING COPPER SMELTING PROCESSES","authors":"Ivica Nikolić, Anđelka Stojanović, Milijana Mitrović","doi":"10.17222/mit.2023.1037","DOIUrl":"https://doi.org/10.17222/mit.2023.1037","url":null,"abstract":"The construction of a copper smelting facility and its undisturbed and profitable business undoubtedly contribute to the development of each country’s economy. These facilities employ many workers and produce a large amount of copper, reducing imports and dependence on this important raw material, thereby improving the economic situation in a given country. More than a hundred copper smelters operate worldwide, many of which use different types of copper extraction processes. Strict legislation relating to ecology and environmental protection as well as stakeholder involvement in selecting and constructing copper smelting facilities limit the maximisation of short-term economic objectives. The prioritisation of technological processes for the extraction of copper must consider the impacts of often mutually opposing economic, technical and environmental objectives. No research from the available literature analyses the economic, technical and environmental parameters systematically. Studies have mainly dealt with exploring individual influences of factors through the use of one selection method. This paper presents the development of a novel hybrid AHP-TOPSIS model in fuzzy environments that will provide both informative decisions and optimum results of decision making.","PeriodicalId":18258,"journal":{"name":"Materiali in tehnologije","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2024-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140754786","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

MICROSTRUCTURE CHARACTERISTICS OF Cr3C2-NiCr COATINGS DEPOSITED WITH THE HIGH-VELOCITY OXY-FUEL THERMAL-SPRAY TECHNIQUE 用高浓度氧-燃料热释光技术沉积的 Cr3C2-NiCr 涂层的微观结构特征

IF 0.5 4区材料科学

Materiali in tehnologije Pub Date : 2024-04-02 DOI: 10.17222/mit.2023.869

Jason Lauzuardy, Eddy Agus Basuki, E. Martides, Selly Septianissa, Budi Prawara, Dedi, E. Junianto, E. Riyanto

{"title":"MICROSTRUCTURE CHARACTERISTICS OF Cr3C2-NiCr COATINGS DEPOSITED WITH THE HIGH-VELOCITY OXY-FUEL THERMAL-SPRAY TECHNIQUE","authors":"Jason Lauzuardy, Eddy Agus Basuki, E. Martides, Selly Septianissa, Budi Prawara, Dedi, E. Junianto, E. Riyanto","doi":"10.17222/mit.2023.869","DOIUrl":"https://doi.org/10.17222/mit.2023.869","url":null,"abstract":"With the goals of protecting boiler tubes from hostile surroundings, increasing thermal efficiency, and minimizing time losses from damage, thermal-spray coating methods for high-temperature operations were created. Ceramic-metal composite materials (e.g., Cr3C2-NiCr) are well known for protecting components from erosion decay in a high-temperature environment. In this investigation, the high-velocity oxy-fuel (HVOF) thermal-spray technique was employed to successfully deposit several variations of feedstocks containing Cr3C2-NiCr and NiCr powders onto a medium-carbon steel substrate, with and without filtering through a 400-mesh screen. Utilizing X-ray fluorescence (XRF), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD), the microstructure features of the deposited coatings were assessed. The experiment results demonstrate that the crystallite and grain sizes of the deposited coatings can be increased by reducing the powder size through a sifting process using a 400-mesh sieve. This procedure also resulted in a coating with a higher density and lower porosity. Furthermore, new compounds including Cr2O3 and MnCr2O4 were formed in the coating layers as indicated by the XRD spectra. These phenomena are in good agreement with the EDS mapping of Cr and O, which reveals highly similar distributions. Manganese was originally a part of the substrate composition. Manganese could diffuse rapidly across the Cr2O3 layer and form the MnCr2O4 compound, indicating the manganese diffusion from the substrate into the Cr3C2-NiCr coating. The formation of MnCr2O4 can be attributed to the prior emergence of the Cr2O3 compound.","PeriodicalId":18258,"journal":{"name":"Materiali in tehnologije","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2024-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140752691","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

EFFECT OF A MAGNETIC FIELD ON THE MICROSTRUCTURE AND PROPERTIES OF RESISTANCE SPOT WELDED JOINTS OF 444 FERRITIC STAINLESS STEEL/6082 ALUMINUM ALLOY 磁场对 444 铁素体不锈钢/6082 铝合金电阻点焊接头微观结构和性能的影响

IF 0.5 4区材料科学

Materiali in tehnologije Pub Date : 2024-04-02 DOI: 10.17222/mit.2023.1055

Xiaoou Zhu, Zhanqi Liu, Qi Zhou, Jie Chen, Shouhong Li

{"title":"EFFECT OF A MAGNETIC FIELD ON THE MICROSTRUCTURE AND PROPERTIES OF RESISTANCE SPOT WELDED JOINTS OF 444 FERRITIC STAINLESS STEEL/6082 ALUMINUM ALLOY","authors":"Xiaoou Zhu, Zhanqi Liu, Qi Zhou, Jie Chen, Shouhong Li","doi":"10.17222/mit.2023.1055","DOIUrl":"https://doi.org/10.17222/mit.2023.1055","url":null,"abstract":"To improve the welding quality of resistance spot welding joints of steel/aluminum lightweight structures, the steady magnetic field-assisted resistance spot welding method was used to weld 444 ferritic stainless steel and 6082 aluminum alloy, both with a thickness of 1 mm. Under the same welding parameters, the effect of a magnetic field on the microstructure and mechanical properties of the joint was analyzed. It was found that the Lorentz force generated by the addition of a magnetic field promoted the circumferential movement of the molten metal in the nugget zone, increased the size of the Fe/Al contact interface in the joint along the horizontal direction, and made an effective use of the heat generated during resistance spot welding. Although the intermetallic compounds in the intermediate transition layer of the two welded materials were mainly composed of (Fe, Cr, Si)Al2 and (Fe, Cr, Si)Al3, relatively low contents of (Fe, Cr, Si)Al2 and (Fe, Cr, Si)Al3 were found and a there was a significant decrease in the thickness of the intermetallic compound layer when the magnetic field was applied. Compared with the welded joint devoid of a magnetic field, the tensile strength and ductility of the joint were effectively improved, and the dimples in the fracture surface became relatively deep and numerous. In essence, resistance spot welding joints of steel/aluminum obtain better comprehensive mechanical properties when a magnetic field is applied.","PeriodicalId":18258,"journal":{"name":"Materiali in tehnologije","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2024-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140752648","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

EFFECT OF OUTPUT VOLTAGE ON AN AZ91D MAGNESIUM ALLOY ROLLED USING AN ELECTRIC PULSE TREATMENT 输出电压对使用电脉冲处理法轧制的 AZ91d 镁合金的影响

IF 0.5 4区材料科学

Materiali in tehnologije Pub Date : 2024-04-02 DOI: 10.17222/mit.2023.960

Jing Feng, Yuezhang Zhou, Dehua Liu, Yong Zhang, Guihong Geng

引用次数: 0

GENETIC ALGORITHM-BASED OPTIMIZATION OF THE LASER-BEAM PATH IN ADDITIVE MANUFACTURING 基于遗传算法的增材制造激光束路径优化

IF 0.5 4区材料科学

Materiali in tehnologije Pub Date : 2024-04-02 DOI: 10.17222/mit.2023.989

P. Potočnik, A. Jeromen, E. Govekar

{"title":"GENETIC ALGORITHM-BASED OPTIMIZATION OF THE LASER-BEAM PATH IN ADDITIVE MANUFACTURING","authors":"P. Potočnik, A. Jeromen, E. Govekar","doi":"10.17222/mit.2023.989","DOIUrl":"https://doi.org/10.17222/mit.2023.989","url":null,"abstract":"This study presents a methodology of genetic-algorithm-based optimization of the laser-beam path for improving laser-based additive manufacturing (AM). A simple thermal model was developed to simulate the effects of laser-induced heat input on the temperature distribution within the substrate during the fabrication of one layer. The optimization approach aims to find solutions with more homogeneous temperature properties that minimize the thermal gradient on the substrate caused by laser-based AM. The laser beam, i.e., the tool-path planning, is formulated as the search for the optimal sequence of cell depositions that minimize the fitness function, which is composed of two components, i.e., the thermal fitness and process fitness. The thermal fitness is expressed as the average thermal gradient, and the process fitness regulates the suitability of the proposed tool path for the implementation of the AM process. Various tool-path generators are proposed to initialize the initial population of tool-path solutions. Genetic-algorithm-based tool-path optimization is proposed, where custom initialization, crossover and mutation operators are developed for application in laser-based AM. Simulation studies demonstrate the effectiveness of the genetic-algorithm-based optimization in finding solutions that minimize the fitness function and therefore provide both thermally and, for the AM process implementation, more suitable laser-beam-path solutions.","PeriodicalId":18258,"journal":{"name":"Materiali in tehnologije","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2024-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140755306","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

STUDYING THE STRENGTH OF DISSIMILAR JOINTS OF AISI 430 AND 301 STAINLESS STEEL WELDED AT DIFFERENT WELDING PARAMETERS 研究不同焊接参数下 Aisi 430 和 301 不锈钢异种焊接接头的强度

IF 0.5 4区材料科学

Materiali in tehnologije Pub Date : 2024-04-02 DOI: 10.17222/mit.2023.1054

Sedat Aras, Rukiye Ertan

{"title":"STUDYING THE STRENGTH OF DISSIMILAR JOINTS OF AISI 430 AND 301 STAINLESS STEEL WELDED AT DIFFERENT WELDING PARAMETERS","authors":"Sedat Aras, Rukiye Ertan","doi":"10.17222/mit.2023.1054","DOIUrl":"https://doi.org/10.17222/mit.2023.1054","url":null,"abstract":"Investigating the best welding parameters for resistance spot welding joints between AISI 430 and AISI 301 stainless steels was the primary focus of this study. This research involved welding samples of these stainless steel types using various welding parameters. Ferritic stainless steel (AISI 430) and austenitic stainless steel (AISI 301) were subjected to resistance spot welding, and different welding conditions were applied to produce a range of samples. The study specifically analyzed the influence of the welding current (2.5, 3.1 and 3.7) kA and welding time (40, 70 and 100) ms on the joining capability of these stainless steels. To determine the best welding parameters, microhardness measurements and tensile-shear tests were performed on the welded materials. The results indicated that increasing the welding current and welding time led to an increase in the tensile load. The maximum tensile-shear load 2036 N was observed at 3.7 kA and 100 ms. However, after a salt spray test (48 and 96) h, a serious decrease in the tensile load from 2036 N to 750 was observed at the high current 3.7 kA and time (70 and 100) ms. At 3.1 kA and 70 ms before and after the salt test, its value remained relatively constant, and the corrosion resistance of the weld joint was at the best level. The microhardness of the heat-affected zone increased, reaching its maximum point (for 3.1 kA and 70 ms: 347.3 HV and for 3.1 kA 100 ms: 369 HV) in the fusion zone. Moreover, the increase in the welding time and current was associated with an increase in the nugget size. The maximum nugget size was 3.61 mm at 3.7 kA and 100 ms.","PeriodicalId":18258,"journal":{"name":"Materiali in tehnologije","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2024-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140755164","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

NUMERICAL MODEL FOR OPTIMIZING THE PARAMETERS FOR LASER-BEAM WELDING OF A HIGH-TEMPERATURE MATERIAL 优化高温材料激光束焊接参数的数值模型

IF 0.5 4区材料科学

Materiali in tehnologije Pub Date : 2024-02-06 DOI: 10.17222/mit.2023.990

R. Palanivel, T. M. Krishnan, Yousef Alqurashi, M. A. Rasheed

引用次数: 0

SYNTHESIS OF CALCIUM SILICATE MATERIALS FROM THE RESIDUAL WASTE SLUDGE OF A WATER-PURIFICATION PLANT 利用净水厂剩余废渣合成硅酸钙材料

IF 0.5 4区材料科学

Materiali in tehnologije Pub Date : 2024-02-06 DOI: 10.17222/mit.2023.876

Do Trung Kien Kieu, N. Thang, Nguyen Vu Uyen Nhi, Do Quang Minh

{"title":"SYNTHESIS OF CALCIUM SILICATE MATERIALS FROM THE RESIDUAL WASTE SLUDGE OF A WATER-PURIFICATION PLANT","authors":"Do Trung Kien Kieu, N. Thang, Nguyen Vu Uyen Nhi, Do Quang Minh","doi":"10.17222/mit.2023.876","DOIUrl":"https://doi.org/10.17222/mit.2023.876","url":null,"abstract":"Calcium silicate is produced from a mixture of silica sand powder, lime, paper pulp, and Portland cement hydrothermally steamed at 180 °C for about 16 h. This material is considered environmentally friendly and is popular in countries around the world. In this study, quartz sand was replaced with residual waste sludge from water-filtration plants to produce calcium silicate materials. Nowadays, the residual waste sludge from water-filtration plants is an environmental problem that needs to be treated. The results of determining the properties showed that a sample using 10 w/% residual waste sludge gave the best replacement. This sample had a bending strength of 10.95 MPa, a volumetric density of 1.57 g/cm3, and water absorption of 23.67 %. The results of the analysis of the mineral composition (by X-ray diffraction analysis and Fourier-transform infrared spectroscopy) and microstructure (by scanning electron microscopy) showed that all samples formed tobermorite and xonotlite minerals. The tobermorite and the xonotlite are hydro-silicate-calcium minerals characteristic of calcium silicate materials, which are the synthesis products of chemical reactions of SiO2, CaO, and H2O under hydrothermal conditions. Samples using 5–10 w/% of waste residual sludge have even higher mechanical strength than samples without. Therefore, using waste residual sludge from water-filtration plants to replace part of the sand in producing calcium silicate materials can be considered an effective method to treat environmental problems caused by waste residual sludge.","PeriodicalId":18258,"journal":{"name":"Materiali in tehnologije","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2024-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139860873","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