A copper metal organic frame work (MOF) is synthesized by taking adequate concentration of 2-mercaptobenzothiazole, 2-bromomalonaldehyde, 1,4 dicarboxylic acid and copper nitrate. Cu-MOF /Ag2O and Cu-MOF/rGO composites are fabricated and is characterized by XRD, UV-Vis spectroscopy and FT-IR. The band gap of the MOF/ nanocomposites is reduced when compare to individuals so that a good visible light harvesting catalyst is formed. This reduction of band gap is due to the either create of shallow state with small ionization energy, very close to the valence and conduction band edge. KEYWORDS: Mercaptobenzothiazole, 2-bromomalonaldehyde MOFs, Copper Composites, Optical Properties, Ag2O, rGO.
{"title":"Influence of Nano Particles on Optical Properties of Cu-MOFs","authors":"Maalathi Challa, B. Yallur, M. Ambika, V. Adimule","doi":"10.4028/p-vn4hd4","DOIUrl":"https://doi.org/10.4028/p-vn4hd4","url":null,"abstract":"A copper metal organic frame work (MOF) is synthesized by taking adequate concentration of 2-mercaptobenzothiazole, 2-bromomalonaldehyde, 1,4 dicarboxylic acid and copper nitrate. Cu-MOF /Ag2O and Cu-MOF/rGO composites are fabricated and is characterized by XRD, UV-Vis spectroscopy and FT-IR. The band gap of the MOF/ nanocomposites is reduced when compare to individuals so that a good visible light harvesting catalyst is formed. This reduction of band gap is due to the either create of shallow state with small ionization energy, very close to the valence and conduction band edge. KEYWORDS: Mercaptobenzothiazole, 2-bromomalonaldehyde MOFs, Copper Composites, Optical Properties, Ag2O, rGO.","PeriodicalId":7271,"journal":{"name":"Advanced Materials Research","volume":"70 1","pages":"23 - 33"},"PeriodicalIF":0.0,"publicationDate":"2022-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85141898","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}
A technique of surface modification used to produce thick coatings with enhanced surface characteristics by developing highly resistive layers on the substrate is known as cladding. It plays a great role to increase the service life of industrial elements. It is broadly applied in chemical, mining, nuclear, power generation, and marine industries. There were a lot of studies done targeting Gas Tungsten Arc Cladding because of its advantages such as user-friendly, low cost, high deposition rate, low dilution, high reliability, etc. The four key features added to the substrate after claddings are dilution of a substrate, microstructure, microhardness, and tribological properties. Considering these features, the current article presents an overview of the Gas Tungsten Arc Cladding technique. The key goal is to reflect on the investigations conducted in the previous decade based on the wear, oxidation, and corrosion performance of cladding surfaces and their key observations. In addition, the effects of Gas Tungsten Arc Cladding process parameters, the substrate-clad materials combination, microstructural improvements, common advantages, and limitations associated with the technique are also presented. New research and industrial people on weld cladding would benefit from the outcomes of this article.
{"title":"Recent Advancements in Surface Modification by Gas Tungsten Arc Cladding Technique: A Review","authors":"R. Ranjan, A. Das","doi":"10.4028/p-ix7nkz","DOIUrl":"https://doi.org/10.4028/p-ix7nkz","url":null,"abstract":"A technique of surface modification used to produce thick coatings with enhanced surface characteristics by developing highly resistive layers on the substrate is known as cladding. It plays a great role to increase the service life of industrial elements. It is broadly applied in chemical, mining, nuclear, power generation, and marine industries. There were a lot of studies done targeting Gas Tungsten Arc Cladding because of its advantages such as user-friendly, low cost, high deposition rate, low dilution, high reliability, etc. The four key features added to the substrate after claddings are dilution of a substrate, microstructure, microhardness, and tribological properties. Considering these features, the current article presents an overview of the Gas Tungsten Arc Cladding technique. The key goal is to reflect on the investigations conducted in the previous decade based on the wear, oxidation, and corrosion performance of cladding surfaces and their key observations. In addition, the effects of Gas Tungsten Arc Cladding process parameters, the substrate-clad materials combination, microstructural improvements, common advantages, and limitations associated with the technique are also presented. New research and industrial people on weld cladding would benefit from the outcomes of this article.","PeriodicalId":7271,"journal":{"name":"Advanced Materials Research","volume":"2835 1","pages":"113 - 122"},"PeriodicalIF":0.0,"publicationDate":"2022-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86507149","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}
Forming an endothelial cell (EC) monolayer on the surface of blood-contacting devices is an ideal way to improve their blood compatibility, this process is known as endothelialization. Heparin is a proteoglycan with a strong negative charge, which is a commonly used antithrombotic agent. Heparin coatings also has been successfully used to improve the hemocompatibility of various biomaterials. In this study, a short peptide Arg-Glu-Asp-Val (REDV) with specific affinity for endothelial cells was covalently conjugated with maleimide-functionalized heparin. The conjugate retains the negative charge of heparin and can be directly immobilized on the surface of positively charged poly-L-lysine. This specific reaction to the carboxyl group of heparin could potentially reduce the shedding and steric hindrance effects of REDV peptide and enhancing the affinity and selectivity of heparin for EC.
{"title":"Covalent Immobilization of REDV Peptide on Heparin Coating Promotes Selective Adhesion of Endothelial Cells","authors":"Peigang Zheng, Zhe Yu, Lian Duan, Jia Hao Zhang, Rao Fu, Rui Jiang","doi":"10.4028/p-0tpt06","DOIUrl":"https://doi.org/10.4028/p-0tpt06","url":null,"abstract":"Forming an endothelial cell (EC) monolayer on the surface of blood-contacting devices is an ideal way to improve their blood compatibility, this process is known as endothelialization. Heparin is a proteoglycan with a strong negative charge, which is a commonly used antithrombotic agent. Heparin coatings also has been successfully used to improve the hemocompatibility of various biomaterials. In this study, a short peptide Arg-Glu-Asp-Val (REDV) with specific affinity for endothelial cells was covalently conjugated with maleimide-functionalized heparin. The conjugate retains the negative charge of heparin and can be directly immobilized on the surface of positively charged poly-L-lysine. This specific reaction to the carboxyl group of heparin could potentially reduce the shedding and steric hindrance effects of REDV peptide and enhancing the affinity and selectivity of heparin for EC.","PeriodicalId":7271,"journal":{"name":"Advanced Materials Research","volume":"99 1","pages":"85 - 89"},"PeriodicalIF":0.0,"publicationDate":"2022-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85784565","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}
Maalathi Challa, M. Ambika, S. Usharani, B. Yallur, V. Adimule
Amorphous metal organic frame work (MOF) with copper was a newly synthesized Cu-MOF which has been converted into a crystalline Cu-MOF with addition of nanometal oxide due to assembling of nanometal oxide on Cu-MOF/nanocomposite. The band gap of Cu-MOF/Ag2O and Cu-MOF/rGO has enhanced from visible light harvesting compound to near and far UV light harvesting material due to quantum size effect and can be used as coating material on appliances working under UV light without any degradation.
{"title":"Enhancement of Band Gap Energy and Crystallinity of Cu-MOFs due to Doping of Nano Metal Oxide","authors":"Maalathi Challa, M. Ambika, S. Usharani, B. Yallur, V. Adimule","doi":"10.4028/p-f9yx5h","DOIUrl":"https://doi.org/10.4028/p-f9yx5h","url":null,"abstract":"Amorphous metal organic frame work (MOF) with copper was a newly synthesized Cu-MOF which has been converted into a crystalline Cu-MOF with addition of nanometal oxide due to assembling of nanometal oxide on Cu-MOF/nanocomposite. The band gap of Cu-MOF/Ag2O and Cu-MOF/rGO has enhanced from visible light harvesting compound to near and far UV light harvesting material due to quantum size effect and can be used as coating material on appliances working under UV light without any degradation.","PeriodicalId":7271,"journal":{"name":"Advanced Materials Research","volume":"23 1","pages":"13 - 22"},"PeriodicalIF":0.0,"publicationDate":"2022-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91092162","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}
In this paper, aiming at the heat resistance and thermal deformation process of titanium matrix composites 0 vol.%, 2.5.vol.%, 5.vol.%. Thermal simulation experiment of titanium matrix composites with different (TiB+TiC) strengthening phase content. The measurement accuracy of material displacement is 0.01 mm. The compression is 70%, and the strain rate is 0.1 mm/s and 0.01 mm/s respectively. Compression tests at different strain rates and temperatures were carried out. The experimental results show that when the (TiB+TiC) 5vol% titanium composite is deformed at 0.01mm/s low strain rate, the peak stresses corresponding to 25°C, 250°C,350 °C and 500°C are increased to 1096MPa, 835MPa, 646MPa and 416MPa respectively. Under the condition of high strain rate of 0.1mm/s, the peak stresses corresponding to 25 °C, 250 °C, 350 °C and 500 °C are increased to 1230 MPa, 896 MPa, 723 MPa and 471 MPa respectively. The deformation law of stress rheological curve is roughly the same, and the high temperature zone has good plastic deformation ability. The titanium matrix composite has high compression rheological mechanical properties and good high-temperature plastic deformation ability. It is the preferred material component for the preparation of titanium matrix composite and powder forging.
{"title":"Effect of Process Parameters on Properties of Titanium Alloy during Thermal Simulation Deformation","authors":"J. Tang, Cui Liang, Chenkun Xu, J. Li","doi":"10.4028/p-d52w5v","DOIUrl":"https://doi.org/10.4028/p-d52w5v","url":null,"abstract":"In this paper, aiming at the heat resistance and thermal deformation process of titanium matrix composites 0 vol.%, 2.5.vol.%, 5.vol.%. Thermal simulation experiment of titanium matrix composites with different (TiB+TiC) strengthening phase content. The measurement accuracy of material displacement is 0.01 mm. The compression is 70%, and the strain rate is 0.1 mm/s and 0.01 mm/s respectively. Compression tests at different strain rates and temperatures were carried out. The experimental results show that when the (TiB+TiC) 5vol% titanium composite is deformed at 0.01mm/s low strain rate, the peak stresses corresponding to 25°C, 250°C,350 °C and 500°C are increased to 1096MPa, 835MPa, 646MPa and 416MPa respectively. Under the condition of high strain rate of 0.1mm/s, the peak stresses corresponding to 25 °C, 250 °C, 350 °C and 500 °C are increased to 1230 MPa, 896 MPa, 723 MPa and 471 MPa respectively. The deformation law of stress rheological curve is roughly the same, and the high temperature zone has good plastic deformation ability. The titanium matrix composite has high compression rheological mechanical properties and good high-temperature plastic deformation ability. It is the preferred material component for the preparation of titanium matrix composite and powder forging.","PeriodicalId":7271,"journal":{"name":"Advanced Materials Research","volume":"63 1","pages":"101 - 106"},"PeriodicalIF":0.0,"publicationDate":"2022-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79338716","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}
G.K. Mahadeva Raju, C. Srikanth, G. Madhu, Dinesh P. Shankar Reddy, K. Karthik
Epoxy was loaded with varying concentrations of fly ash and was characterized for its structural properties using XRD and SEM. The XRD results revealed reduction of crystallinity with increase in filler content indicating that the composites are semi crystalline in nature. The SEM images showed that at lower concentration of filler content, fly ash is uniformly distributed within the epoxy and at higher concentrations of fly ash, agglomerates were observed. Mechanical properties such as tensile and compressive properties were estimated and the results showed that, the composites exhibit enhanced tensile strength and compressive strength for epoxy with 20 wt% fly ash. Flammable properties such as heat release rate, peak heat release rate, time to ignition, CO and CO2 yields are estimated and reported. Decrease in combustion time, peak heat release rate, time to ignition, CO and CO2 yields with increase in filler content clearly indicates the superior flammability performance of epoxy composites loaded with fly ash.
{"title":"Fly Ash Epoxy Composites with Superior Fire Retardant Properties","authors":"G.K. Mahadeva Raju, C. Srikanth, G. Madhu, Dinesh P. Shankar Reddy, K. Karthik","doi":"10.4028/p-hfbu93","DOIUrl":"https://doi.org/10.4028/p-hfbu93","url":null,"abstract":"Epoxy was loaded with varying concentrations of fly ash and was characterized for its structural properties using XRD and SEM. The XRD results revealed reduction of crystallinity with increase in filler content indicating that the composites are semi crystalline in nature. The SEM images showed that at lower concentration of filler content, fly ash is uniformly distributed within the epoxy and at higher concentrations of fly ash, agglomerates were observed. Mechanical properties such as tensile and compressive properties were estimated and the results showed that, the composites exhibit enhanced tensile strength and compressive strength for epoxy with 20 wt% fly ash. Flammable properties such as heat release rate, peak heat release rate, time to ignition, CO and CO2 yields are estimated and reported. Decrease in combustion time, peak heat release rate, time to ignition, CO and CO2 yields with increase in filler content clearly indicates the superior flammability performance of epoxy composites loaded with fly ash.","PeriodicalId":7271,"journal":{"name":"Advanced Materials Research","volume":"150 1","pages":"83 - 94"},"PeriodicalIF":0.0,"publicationDate":"2022-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75763066","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}
Abel Woldu Ourgessa, Aseged Tebeje Tasew, Rahel Alemu Hafa
In this study, fly ash was used to synthesize geopolymer mortar by using an activating solution prepared from a different concentration of NaOH and a highly viscous Na-silicate. The NaOH concentration prepared were 8M, 12M, and 14M. The prepared geopolymers were cured at different temperatures (ambient, 40°C, and 60°C) and were studied to determine their strength, bond structure, mechanical properties, and resistance in an acidic and salty environment using an accelerated durability test. FTIR results showed distinctive peaks of aluminosilicate bond structures. Maximum strength was achieved for 14M samples cured at room temperature. Higher alkalinity resulted in higher compressive and flexural strength and lower water absorption. Lower water absorption capacity and higher resistance to the extreme environment were achieved for samples cured at higher temperatures and higher molarities. The maximum mass loss was 10.9% for 8M cured at ambient temperature exposed to an acidic environment.
{"title":"The Effect of Alkaline Concentration and Curing Temperature on the Durability of Fly Ash Geopolymer Mortar","authors":"Abel Woldu Ourgessa, Aseged Tebeje Tasew, Rahel Alemu Hafa","doi":"10.4028/p-ceit32","DOIUrl":"https://doi.org/10.4028/p-ceit32","url":null,"abstract":"In this study, fly ash was used to synthesize geopolymer mortar by using an activating solution prepared from a different concentration of NaOH and a highly viscous Na-silicate. The NaOH concentration prepared were 8M, 12M, and 14M. The prepared geopolymers were cured at different temperatures (ambient, 40°C, and 60°C) and were studied to determine their strength, bond structure, mechanical properties, and resistance in an acidic and salty environment using an accelerated durability test. FTIR results showed distinctive peaks of aluminosilicate bond structures. Maximum strength was achieved for 14M samples cured at room temperature. Higher alkalinity resulted in higher compressive and flexural strength and lower water absorption. Lower water absorption capacity and higher resistance to the extreme environment were achieved for samples cured at higher temperatures and higher molarities. The maximum mass loss was 10.9% for 8M cured at ambient temperature exposed to an acidic environment.","PeriodicalId":7271,"journal":{"name":"Advanced Materials Research","volume":"8 1","pages":"95 - 107"},"PeriodicalIF":0.0,"publicationDate":"2022-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75177022","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}
D. Tanasković, M. Aranđelović, B. Đorđević, S. Sedmak
This paper covers the literature review of the work by author, who have been involved in the subject of machine element repairing from the techno-economical point of view. Positive aspects of repairing, as opposed to purchasing new parts are shown and discussed. All of the examples given as part of the literature review are related to real, practical problems. It was concluded in all cases, that the repairing of damaged parts was the better option, since not only did it cost significantly less, it also noticeably decreased the equipment downtime, as there was no need to wait for the new part to be delivered.
{"title":"Review: Advantages of Repairing Machine Parts in Order to Restore their Functionality","authors":"D. Tanasković, M. Aranđelović, B. Đorđević, S. Sedmak","doi":"10.4028/p-394qc2","DOIUrl":"https://doi.org/10.4028/p-394qc2","url":null,"abstract":"This paper covers the literature review of the work by author, who have been involved in the subject of machine element repairing from the techno-economical point of view. Positive aspects of repairing, as opposed to purchasing new parts are shown and discussed. All of the examples given as part of the literature review are related to real, practical problems. It was concluded in all cases, that the repairing of damaged parts was the better option, since not only did it cost significantly less, it also noticeably decreased the equipment downtime, as there was no need to wait for the new part to be delivered.","PeriodicalId":7271,"journal":{"name":"Advanced Materials Research","volume":"22 1","pages":"45 - 50"},"PeriodicalIF":0.0,"publicationDate":"2022-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86716575","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}
Friction stir welding (FSW) is an important research direction within ISIM Timisoara. Also within ISIM Timisoara, in addition to the classic FSW welding, processes and methods derived from FSW were also approached. Those processes and methods include friction stir processing (FSP), coatings with functional layers by friction, conventional friction riveting and friction riveting with hybrid effect, hybrid welding methods: TIG assisted friction stir welding FSW-TIG and ultrasonic assisted friction stir welding FSW-US. Recent research were focused on a new method of applying the FSW process, namely friction stir welding in inert gas environment (FSW-IG). Results obtained by ISIM in the field of FSW-IG welding are presented: data / information on solutions for applying inert gas in the welding area, as well as experimental results obtained for FSW-IG welding of DD13 steel, Cu99 copper and AZ31B magnesium alloy respectively. The solutions for providing shielding gas in the welding area were analyzed, verified and validated by experiment. The experimental welding programs generated the necessary data for the development of the FSW-IG welding technologies for the approached materials. By applying FSW-IG welding there was an improvement in the aspect of the welded joints and for some of mechanical characteristics (as the case may be) compared to the application of classic FSW welding. The use of shielding gas also had beneficial effects on the service life of FSW tools.
{"title":"ISIM Achievements Regarding Friction Stir Welding in Inert Gas Environment","authors":"L. Boțilă, R. Cojocaru","doi":"10.4028/p-wr0f72","DOIUrl":"https://doi.org/10.4028/p-wr0f72","url":null,"abstract":"Friction stir welding (FSW) is an important research direction within ISIM Timisoara. Also within ISIM Timisoara, in addition to the classic FSW welding, processes and methods derived from FSW were also approached. Those processes and methods include friction stir processing (FSP), coatings with functional layers by friction, conventional friction riveting and friction riveting with hybrid effect, hybrid welding methods: TIG assisted friction stir welding FSW-TIG and ultrasonic assisted friction stir welding FSW-US. Recent research were focused on a new method of applying the FSW process, namely friction stir welding in inert gas environment (FSW-IG). Results obtained by ISIM in the field of FSW-IG welding are presented: data / information on solutions for applying inert gas in the welding area, as well as experimental results obtained for FSW-IG welding of DD13 steel, Cu99 copper and AZ31B magnesium alloy respectively. The solutions for providing shielding gas in the welding area were analyzed, verified and validated by experiment. The experimental welding programs generated the necessary data for the development of the FSW-IG welding technologies for the approached materials. By applying FSW-IG welding there was an improvement in the aspect of the welded joints and for some of mechanical characteristics (as the case may be) compared to the application of classic FSW welding. The use of shielding gas also had beneficial effects on the service life of FSW tools.","PeriodicalId":7271,"journal":{"name":"Advanced Materials Research","volume":"26 1","pages":"15 - 24"},"PeriodicalIF":0.0,"publicationDate":"2022-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73947606","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}
C. Ghera, I. Lazăr, Daniela Alexa, I. Bordeasu, N. Sîrbu, D. Ostoia, M. Hluscu, C. L. Sălcianu, D. Stroita, Dumitru Viorel Bazavan, M. Sava, L. Micu
Among other parts made of brass there are also the blades and the rotors of the hydraulic machines, respectively ship propellers, which during operation are degraded by cavitation erosion. As a result, most of the researches, including the most recent ones, are focused on the morphological analysis of structures eroded under the impact of micro-jets and shock waves, produced by cavitation hydrodynamics. The goal is to create new materials, but also to use new treatment technologies to increase cavitation resistance. As the literature is quite poor in studies related to the materials resistance to cavitation erosion, respectively treatments and technological procedures of it’s improvement, this paper presents the research results on the behavior of vibration cavitation erosion, carried out on three sets of CuZn39Pb3 brass samples, subjected to volumetric heat treatments of hardening for putting in solution at 800°C, followed by tempering at 250°C, 400°C and 600°C. The characterization of the behavior and the cavitation resistance of the structures resulting from the applied heat treatments is performed based on macroscopic images, taken at different representative periods, SEM images at the end of the test duration and values of specific parameters recommended by ASTM G32-2016. The analysis highlights the differences caused by the change in structure by varying the temperature, but also the hardness of the surface exposed to the cavity. Thus, of the three treatments, it is found that the best resistance to cavitation is conferred by the structure resulting from hardening at 800°C, with tempering at 250°C.
{"title":"New Results Regarding the Cavitation Destruction Behavior of Heat-Treated CuZn39Pb3 Brass with Different Parameters","authors":"C. Ghera, I. Lazăr, Daniela Alexa, I. Bordeasu, N. Sîrbu, D. Ostoia, M. Hluscu, C. L. Sălcianu, D. Stroita, Dumitru Viorel Bazavan, M. Sava, L. Micu","doi":"10.4028/p-462v06","DOIUrl":"https://doi.org/10.4028/p-462v06","url":null,"abstract":"Among other parts made of brass there are also the blades and the rotors of the hydraulic machines, respectively ship propellers, which during operation are degraded by cavitation erosion. As a result, most of the researches, including the most recent ones, are focused on the morphological analysis of structures eroded under the impact of micro-jets and shock waves, produced by cavitation hydrodynamics. The goal is to create new materials, but also to use new treatment technologies to increase cavitation resistance. As the literature is quite poor in studies related to the materials resistance to cavitation erosion, respectively treatments and technological procedures of it’s improvement, this paper presents the research results on the behavior of vibration cavitation erosion, carried out on three sets of CuZn39Pb3 brass samples, subjected to volumetric heat treatments of hardening for putting in solution at 800°C, followed by tempering at 250°C, 400°C and 600°C. The characterization of the behavior and the cavitation resistance of the structures resulting from the applied heat treatments is performed based on macroscopic images, taken at different representative periods, SEM images at the end of the test duration and values of specific parameters recommended by ASTM G32-2016. The analysis highlights the differences caused by the change in structure by varying the temperature, but also the hardness of the surface exposed to the cavity. Thus, of the three treatments, it is found that the best resistance to cavitation is conferred by the structure resulting from hardening at 800°C, with tempering at 250°C.","PeriodicalId":7271,"journal":{"name":"Advanced Materials Research","volume":"5 1","pages":"1 - 8"},"PeriodicalIF":0.0,"publicationDate":"2022-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90213635","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}
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