Pub Date : 2020-01-31DOI: 10.18311/jsst/2019/20961
S. Baskar, F. Gourbilleau, R. Pratibha Nalini
Si-C based alloys have attracted much attention due to their potential applications in electronic and optical devices. In this paper, a-SixCy thin films with different Silicon (Si) content are obtained by sputtering of SiC; co-sputtering of SiC and Si targets at different deposition temperatures (Td) such as 200oC, 350oC and 500oC. It is annealed at various annealing temperature (Ta) using conventional thermal annealing (CTA) and Rapid Thermal Annealing (RTA) techniques. The effect of excess Si incorporation and the unintentional oxidation during various stages of sample preparation are discussed. Their structural and optical properties are investigated using spectroscopic ellipsometry, X-Ray Diffraction spectroscopy (XRD), and Fourier Transform Infrared spectroscopy (FTIR). The refractive index value (n1.95eV) varies between 1.6 to 3.6, suggesting the transition from porous silicon carbide to Si-rich silicon carbide or silicon oxycarbide upon increasing Td and Ta, which is also supported by the FTIR spectra. The emergence of absorption peak between ~950 cm−1 and 1100 cm−1 with the increase of Ta and excess silicon is attributed to Si-O a stretching vibration bond which is an indication of Si richness and unintentional oxidation during annealing. Detailed analysis on the process parameters and the evolution of phase transformations are discussed.
{"title":"Synthesis and Characterization of a-SixCy Thin Films Prepared by RF Magnetron Co-Sputtering Technique","authors":"S. Baskar, F. Gourbilleau, R. Pratibha Nalini","doi":"10.18311/jsst/2019/20961","DOIUrl":"https://doi.org/10.18311/jsst/2019/20961","url":null,"abstract":"Si-C based alloys have attracted much attention due to their potential applications in electronic and optical devices. In this paper, a-SixCy thin films with different Silicon (Si) content are obtained by sputtering of SiC; co-sputtering of SiC and Si targets at different deposition temperatures (Td) such as 200oC, 350oC and 500oC. It is annealed at various annealing temperature (Ta) using conventional thermal annealing (CTA) and Rapid Thermal Annealing (RTA) techniques. The effect of excess Si incorporation and the unintentional oxidation during various stages of sample preparation are discussed. Their structural and optical properties are investigated using spectroscopic ellipsometry, X-Ray Diffraction spectroscopy (XRD), and Fourier Transform Infrared spectroscopy (FTIR). The refractive index value (n1.95eV) varies between 1.6 to 3.6, suggesting the transition from porous silicon carbide to Si-rich silicon carbide or silicon oxycarbide upon increasing Td and Ta, which is also supported by the FTIR spectra. The emergence of absorption peak between ~950 cm−1 and 1100 cm−1 with the increase of Ta and excess silicon is attributed to Si-O a stretching vibration bond which is an indication of Si richness and unintentional oxidation during annealing. Detailed analysis on the process parameters and the evolution of phase transformations are discussed.","PeriodicalId":17031,"journal":{"name":"Journal of Surface Science and Technology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46949499","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}
Pub Date : 2020-01-31DOI: 10.18311/JSST/2019/22232
S. Sathish, J. Kumar, D. Prabu, G. Narendrakumar
Today there is a great focus on reusing the effluent water in the dyeing process. The objective of this research work is to effectively remove colour from textile wastewater using Electro Fenton (E-Fenton) process. E-Fenton process is the combination of Fenton and electrochemical processes. In this study decolorization of Congo red dye was investigated by E-Fenton process in a continuous reactor equipped with iron electrodes. Experiments were carried out in a reactor of working volume of 1L. The degree of decolourisation varies with the operating parameters. The optimal working conditions were maintained with an electrode potential difference of 2V, 40°C, pH 4. For Electro Fenton's process the parameters giving the highest efficiency were decolourisation percentage of 97%. The process parameters were optimized by using response surface methodology to understand the effectiveness of the interactions of variables when the maximum decolourization can be achieved. The experimental results proved that the combination of Fenton and Electrochemical process was an excellent method for treatment of textile wastewater.
{"title":"Evaluation of E-Fenton Process in Decolourization of Azo Dye (Congo Red) using Response Surface Methodology","authors":"S. Sathish, J. Kumar, D. Prabu, G. Narendrakumar","doi":"10.18311/JSST/2019/22232","DOIUrl":"https://doi.org/10.18311/JSST/2019/22232","url":null,"abstract":"Today there is a great focus on reusing the effluent water in the dyeing process. The objective of this research work is to effectively remove colour from textile wastewater using Electro Fenton (E-Fenton) process. E-Fenton process is the combination of Fenton and electrochemical processes. In this study decolorization of Congo red dye was investigated by E-Fenton process in a continuous reactor equipped with iron electrodes. Experiments were carried out in a reactor of working volume of 1L. The degree of decolourisation varies with the operating parameters. The optimal working conditions were maintained with an electrode potential difference of 2V, 40°C, pH 4. For Electro Fenton's process the parameters giving the highest efficiency were decolourisation percentage of 97%. The process parameters were optimized by using response surface methodology to understand the effectiveness of the interactions of variables when the maximum decolourization can be achieved. The experimental results proved that the combination of Fenton and Electrochemical process was an excellent method for treatment of textile wastewater.","PeriodicalId":17031,"journal":{"name":"Journal of Surface Science and Technology","volume":"788 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41284263","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}
Pub Date : 2020-01-31DOI: 10.18311/jsst/2019/18088
Dr. Duradundi Sawant Badkar
In the presented study, the laser transformation hardening of commercially pure titanium sheet material of thickness being 1.6mm is investigated using CW, 1.6 kW solid State Nd: YAG laser. A Full Factorial Design (FFD) with Response Surface Methodology (RSM) is employed to establish, optimize and to investigate the relationships of three laser transformation hardening process parameters such as laser power, scanning speed, and focused position on laser hardened bead profile parameters such as hardened bead width, hardened depth, heat input and power density. In this work, Laser Transformation Hardening (LTH) with high precision and an optimum desired minimum value of hardened depth of 241 microns has been accomplished with heat input = 150 J/cm and power density = 294.08 W/mm2 for the laser process parameters of lower beam power: 750 Watts, high scanning speed: 3000 mm/min and a defocused beam of –30 mm. Effects of laser process parameters on laser hardened bead geometries were carried out using RSM. Results indicate that the scanning speed has a positive effect on all hardened bead dimensions while the laser power has a positive effect particularly on hardened bead width as compared to hardened depth and heat input. The optimum laser hardening conditions are identified sequentially to minimise hardened depth, heat input, power density and maximum hardened bead width. The validation results demonstrate that the developed models are accurate with low percentages of error.
{"title":"Application of Response Surface Methodology for Modeling of Laser Transformation Hardening of Commercially Pure Titanium ASTM Grade3","authors":"Dr. Duradundi Sawant Badkar","doi":"10.18311/jsst/2019/18088","DOIUrl":"https://doi.org/10.18311/jsst/2019/18088","url":null,"abstract":"In the presented study, the laser transformation hardening of commercially pure titanium sheet material of thickness being 1.6mm is investigated using CW, 1.6 kW solid State Nd: YAG laser. A Full Factorial Design (FFD) with Response Surface Methodology (RSM) is employed to establish, optimize and to investigate the relationships of three laser transformation hardening process parameters such as laser power, scanning speed, and focused position on laser hardened bead profile parameters such as hardened bead width, hardened depth, heat input and power density. In this work, Laser Transformation Hardening (LTH) with high precision and an optimum desired minimum value of hardened depth of 241 microns has been accomplished with heat input = 150 J/cm and power density = 294.08 W/mm2 for the laser process parameters of lower beam power: 750 Watts, high scanning speed: 3000 mm/min and a defocused beam of –30 mm. Effects of laser process parameters on laser hardened bead geometries were carried out using RSM. Results indicate that the scanning speed has a positive effect on all hardened bead dimensions while the laser power has a positive effect particularly on hardened bead width as compared to hardened depth and heat input. The optimum laser hardening conditions are identified sequentially to minimise hardened depth, heat input, power density and maximum hardened bead width. The validation results demonstrate that the developed models are accurate with low percentages of error.","PeriodicalId":17031,"journal":{"name":"Journal of Surface Science and Technology","volume":"31 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67530354","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}
Pub Date : 2020-01-31DOI: 10.18311/JSST/2019/22432
A. Suresh, B. Ganesh, S. Velmurugan
The textile dying industry contains effluents which are harmful to human health and environment. In this research work, decolourisation of congo red dye was studied using natural coagulant like Moringa oleifera Seed Powder (MOSP) and Maize Seed Powder (MSP) which are suitable alternative for chemical coagulants in coagulation and flocculation process. Absorbance value was determined for various concentration of congo red dye by using a UV spectrophotometer and the calibration curve was drawn. Experiments were carried out for determining the percentage of decolorisation using MOSP and MSP. The different parameters such as pH, temperature, coagulant dose and flocculation time were optimized. The optimum decolorisation percentage of congo red was observed for natural coagulant MOSP with removal efficiency of 92% at coagulant dosage of 200 mg/l, temperature of 5000C, pH of 7.5 and flocculation time of 60 minutes. For natural coagulant MSP, Congo red decolorisation efficiency was found to be 65% at coagulant dosage of 50 mg/l, temperature 5000C, 5 pH and flocculation time of 90 minutes. Hence, it can be inferred that MOSP gives better decolorisation efficiency than MSP for Congo red removal.
{"title":"Decolorisation of Azo Dye (Congo red) from Synthetic Solution using Natural Coagulants","authors":"A. Suresh, B. Ganesh, S. Velmurugan","doi":"10.18311/JSST/2019/22432","DOIUrl":"https://doi.org/10.18311/JSST/2019/22432","url":null,"abstract":"The textile dying industry contains effluents which are harmful to human health and environment. In this research work, decolourisation of congo red dye was studied using natural coagulant like Moringa oleifera Seed Powder (MOSP) and Maize Seed Powder (MSP) which are suitable alternative for chemical coagulants in coagulation and flocculation process. Absorbance value was determined for various concentration of congo red dye by using a UV spectrophotometer and the calibration curve was drawn. Experiments were carried out for determining the percentage of decolorisation using MOSP and MSP. The different parameters such as pH, temperature, coagulant dose and flocculation time were optimized. The optimum decolorisation percentage of congo red was observed for natural coagulant MOSP with removal efficiency of 92% at coagulant dosage of 200 mg/l, temperature of 5000C, pH of 7.5 and flocculation time of 60 minutes. For natural coagulant MSP, Congo red decolorisation efficiency was found to be 65% at coagulant dosage of 50 mg/l, temperature 5000C, 5 pH and flocculation time of 90 minutes. Hence, it can be inferred that MOSP gives better decolorisation efficiency than MSP for Congo red removal.","PeriodicalId":17031,"journal":{"name":"Journal of Surface Science and Technology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42151159","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}
Pub Date : 2020-01-31DOI: 10.18311/jsst/2019/17873
Dr. Duradundi Sawant Badkar
In this research paper, overlapped multipass Laser Transformation Hardening (LTH) of Ti-6Al-4V titanium alloy sheet of 2 mm thickness was analyzed experimentally for uniformly intense, CW spherical beam moving with constant speed using 2 kW Nd: YAG laser. Experiments were conducted for optimized two sets of laser process parameters: 1. High Laser Process Parameter (HLPP), Lp = 800 Watts, Ss = 3000 mm/min, Fp = -10 mm, with heat input 180 J/cm and 2. Low Laser Process Parameter (LLPP), Lp = 600 Watts, Ss = 2000 mm/min, Fp = -10 mm, with heat input 160 J/cm respectively having same Fp = -10 mm. The maximum, minimum and average hardened depths of 0.27, 0.19 and 0.23 mm respectively, achieved for HLPP were found to be minimum, as compared to the maximum, minimum and average hardened depths of 0.38, 0.29 and 0.33 mm, respectively, for LLPP. Measurements of Vickers micro-hardness survey of the hardened zone of the laser processed Ti-6Al-4V alloy are presented. Vickers micro-hardness of an as-received two-phase (α+β) Ti-6Al-4V titanium alloy is 328 HV. The results showed that Vickers micro-hardness on top of the surface (TS), in hardened or fusion zone (Fz), at the interface of Fz -Haz, in the heat affected zone (Haz) is higher than the bulk material. The high hardness values of 450 HV and 445 HV were investigated on the top surface for high and low laser process parameters respectively. This can be the quality characteristics of the dissolution of small amounts of oxygen, nitrogen, and carbon with hard martensite α' (transformed β) formation, thereby ensuring an increase in wear resistance of laser treated hardened surface of Ti-6Al-4V considerably in relation to the untreated or base alloy.
{"title":"Study on Hardness and Microstructural Properties of Ti-6Al-4V Alloy using Overlapped Multipass Laser Transformation Hardening under Optimized Test Conditions","authors":"Dr. Duradundi Sawant Badkar","doi":"10.18311/jsst/2019/17873","DOIUrl":"https://doi.org/10.18311/jsst/2019/17873","url":null,"abstract":"In this research paper, overlapped multipass Laser Transformation Hardening (LTH) of Ti-6Al-4V titanium alloy sheet of 2 mm thickness was analyzed experimentally for uniformly intense, CW spherical beam moving with constant speed using 2 kW Nd: YAG laser. Experiments were conducted for optimized two sets of laser process parameters: 1. High Laser Process Parameter (HLPP), Lp = 800 Watts, Ss = 3000 mm/min, Fp = -10 mm, with heat input 180 J/cm and 2. Low Laser Process Parameter (LLPP), Lp = 600 Watts, Ss = 2000 mm/min, Fp = -10 mm, with heat input 160 J/cm respectively having same Fp = -10 mm. The maximum, minimum and average hardened depths of 0.27, 0.19 and 0.23 mm respectively, achieved for HLPP were found to be minimum, as compared to the maximum, minimum and average hardened depths of 0.38, 0.29 and 0.33 mm, respectively, for LLPP. Measurements of Vickers micro-hardness survey of the hardened zone of the laser processed Ti-6Al-4V alloy are presented. Vickers micro-hardness of an as-received two-phase (α+β) Ti-6Al-4V titanium alloy is 328 HV. The results showed that Vickers micro-hardness on top of the surface (TS), in hardened or fusion zone (Fz), at the interface of Fz -Haz, in the heat affected zone (Haz) is higher than the bulk material. The high hardness values of 450 HV and 445 HV were investigated on the top surface for high and low laser process parameters respectively. This can be the quality characteristics of the dissolution of small amounts of oxygen, nitrogen, and carbon with hard martensite α' (transformed β) formation, thereby ensuring an increase in wear resistance of laser treated hardened surface of Ti-6Al-4V considerably in relation to the untreated or base alloy.","PeriodicalId":17031,"journal":{"name":"Journal of Surface Science and Technology","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67530339","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}
Pub Date : 2019-06-25DOI: 10.18311/JSST/2019/16349
K. Sharma, S. Negi, K. Kishore
Density, viscosity, ultrasonic velocity and refractive index measurements of Glycerol Monostearate (GMS) in 80/20 (% v/v) benzene-methanol mixture at 290 K with varying concentrations have shown that there is noticeable variation in aggregation of non-ionic surfactant at Critical Micellar Concentration (CMC). Density and viscosity results have been satisfactorily explained by some well-known equations viz. Jones-Dole, Moulik, Vand, Einstein and Root. Jacobson model has been used to evaluate adiabatic compressibility, molar compressibility, solvation number molar sound velocity, relaxation strength, relative association and other allied acoustical constants. The variation of refractive index with concentration of GMS solutions shows a marked change in value at CMC. Treatment of data obtained from density, viscosity, ultrasonic velocity and refractive index measurements has shown that strong interaction exists between GMS and solvent molecules, and GMS molecules do not aggregate considerably in pre-micellization region.
{"title":"Ultrasonic Velocity and Critical Micellar Concentration of Glycerol Monostearate in Mixed Organic Solvent at 290 K","authors":"K. Sharma, S. Negi, K. Kishore","doi":"10.18311/JSST/2019/16349","DOIUrl":"https://doi.org/10.18311/JSST/2019/16349","url":null,"abstract":"Density, viscosity, ultrasonic velocity and refractive index measurements of Glycerol Monostearate (GMS) in 80/20 (% v/v) benzene-methanol mixture at 290 K with varying concentrations have shown that there is noticeable variation in aggregation of non-ionic surfactant at Critical Micellar Concentration (CMC). Density and viscosity results have been satisfactorily explained by some well-known equations viz. Jones-Dole, Moulik, Vand, Einstein and Root. Jacobson model has been used to evaluate adiabatic compressibility, molar compressibility, solvation number molar sound velocity, relaxation strength, relative association and other allied acoustical constants. The variation of refractive index with concentration of GMS solutions shows a marked change in value at CMC. Treatment of data obtained from density, viscosity, ultrasonic velocity and refractive index measurements has shown that strong interaction exists between GMS and solvent molecules, and GMS molecules do not aggregate considerably in pre-micellization region.","PeriodicalId":17031,"journal":{"name":"Journal of Surface Science and Technology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47056832","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}
Pub Date : 2019-06-25DOI: 10.18311/JSST/2019/21052
F. N. Jiménez-García, L. R. Giraldo-Torres, B. Segura-Giraldo, A. Giraldo-Betancur, J. Muñoz-Saldaña
The effect of growing conditions and post treatments in electrodeposited calcium phosphate films on 316 L stainless steel is presented. The concentration and pH of electrolyte solution and the potential values for the electrodeposition process were determined based on a study of cyclic voltammetry curves. The electrolyte concentration was fixed at 0.025 M ((NH4) H2PO4) and 0.042 M (Ca(NO3)2.4H2O), choosing a pH = 5 as the better condition for the films deposition. In addition, the electrolyte temperature was varied between room temperature and 60°C to determine the influence of this parameter on the deposited films. Films were characterized using Fourier Transform Infrared Spectroscopy, X-ray diffraction and Scanning electron microscopy equipped with energy dispersive spectroscopy. The as deposited films at -1.2 V and -1.7 V exhibit the dicalcium phosphate dihydrate phase (Brushite) while thermal post treatment favor the formation of octacalcium phosphate in amorphous phase, and basic treatment tend to produce the Hydroxyapatite phase. The suggested mechanism for the HAp phase formation, after the basic treatment, consists in providing the necessary OH- groups to complete the synthesis process.
{"title":"Effect of Growing Conditions and Post Treatments on Calcium Phosphate Films Obtained by Electrode Position","authors":"F. N. Jiménez-García, L. R. Giraldo-Torres, B. Segura-Giraldo, A. Giraldo-Betancur, J. Muñoz-Saldaña","doi":"10.18311/JSST/2019/21052","DOIUrl":"https://doi.org/10.18311/JSST/2019/21052","url":null,"abstract":"The effect of growing conditions and post treatments in electrodeposited calcium phosphate films on 316 L stainless steel is presented. The concentration and pH of electrolyte solution and the potential values for the electrodeposition process were determined based on a study of cyclic voltammetry curves. The electrolyte concentration was fixed at 0.025 M ((NH4) H2PO4) and 0.042 M (Ca(NO3)2.4H2O), choosing a pH = 5 as the better condition for the films deposition. In addition, the electrolyte temperature was varied between room temperature and 60°C to determine the influence of this parameter on the deposited films. Films were characterized using Fourier Transform Infrared Spectroscopy, X-ray diffraction and Scanning electron microscopy equipped with energy dispersive spectroscopy. The as deposited films at -1.2 V and -1.7 V exhibit the dicalcium phosphate dihydrate phase (Brushite) while thermal post treatment favor the formation of octacalcium phosphate in amorphous phase, and basic treatment tend to produce the Hydroxyapatite phase. The suggested mechanism for the HAp phase formation, after the basic treatment, consists in providing the necessary OH- groups to complete the synthesis process.","PeriodicalId":17031,"journal":{"name":"Journal of Surface Science and Technology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46382541","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}
Pub Date : 2019-06-25DOI: 10.18311/jsst/2019/20098
Baljit Singh, A. Mohanty
This paper investigates the tribological properties of MWCNT/Graphene (GnP)/ Nanodiamond (NDs) reinforced hybrid epoxy composites. In this paper, the hardness, surface roughness and wear properties of epoxy with MWCNT/NDs, Graphene/NDs, and MWCNT/ Graphene reinforced epoxy composites have been investigated using a Vicker hardness tester, surface roughness tester and reciprocating wear tester respectively. Hardness evaluated using the diagonal length (Hv, l) and by the indentation depth (Hv, d) of thermoset polymers, epoxy resin, was carried out. In addition filler, very much enhances the wear properties of the epoxy resin, by reducing the friction coefficient and wear rate. The result of different fillers on the tribological behaviour of an epoxy has been studied using untreated MWCNT, Graphene, NDs and mixture of MWCNT/NDs, Graphene/NDs and MWCNT/Graphene. Addition of filler greatly enhances the tribological properties of epoxy resin.
{"title":"A Comparative Study of Novel Tribological Response of Hybrid Epoxy Composites Reinforced by MWCNT/ Graphene/Nanodiamond","authors":"Baljit Singh, A. Mohanty","doi":"10.18311/jsst/2019/20098","DOIUrl":"https://doi.org/10.18311/jsst/2019/20098","url":null,"abstract":"This paper investigates the tribological properties of MWCNT/Graphene (GnP)/ Nanodiamond (NDs) reinforced hybrid epoxy composites. In this paper, the hardness, surface roughness and wear properties of epoxy with MWCNT/NDs, Graphene/NDs, and MWCNT/ Graphene reinforced epoxy composites have been investigated using a Vicker hardness tester, surface roughness tester and reciprocating wear tester respectively. Hardness evaluated using the diagonal length (Hv, l) and by the indentation depth (Hv, d) of thermoset polymers, epoxy resin, was carried out. In addition filler, very much enhances the wear properties of the epoxy resin, by reducing the friction coefficient and wear rate. The result of different fillers on the tribological behaviour of an epoxy has been studied using untreated MWCNT, Graphene, NDs and mixture of MWCNT/NDs, Graphene/NDs and MWCNT/Graphene. Addition of filler greatly enhances the tribological properties of epoxy resin.","PeriodicalId":17031,"journal":{"name":"Journal of Surface Science and Technology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45616145","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}
Pub Date : 2019-06-25DOI: 10.18311/jsst/2019/23508
Animesh Kumar Rakshit, Satya Priya Moulik
Irving Langmuir published a seminal paper, on the adsorption of gases at a constant temperature in 1918, which presented one of the most important isotherm equations available in post Langmuir era. Many other useful isotherm equations were suggested both before and after 1918. The 1918 equation was the first where a model for adsorption phenomenon was suggested. In this article, we present a reasonably coherent discussion on Langmuir and some other adsorption isotherms reported in literature focusing on their uses and applications as well as analysing the merits and demerits to commemorate the hundred years of Langmuir's pioneering contribution in surface chemistry.
{"title":"Centenary of Langmuir Isotherm","authors":"Animesh Kumar Rakshit, Satya Priya Moulik","doi":"10.18311/jsst/2019/23508","DOIUrl":"https://doi.org/10.18311/jsst/2019/23508","url":null,"abstract":"Irving Langmuir published a seminal paper, on the adsorption of gases at a constant temperature in 1918, which presented one of the most important isotherm equations available in post Langmuir era. Many other useful isotherm equations were suggested both before and after 1918. The 1918 equation was the first where a model for adsorption phenomenon was suggested. In this article, we present a reasonably coherent discussion on Langmuir and some other adsorption isotherms reported in literature focusing on their uses and applications as well as analysing the merits and demerits to commemorate the hundred years of Langmuir's pioneering contribution in surface chemistry.","PeriodicalId":17031,"journal":{"name":"Journal of Surface Science and Technology","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67530644","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}
Pub Date : 2019-06-25DOI: 10.18311/JSST/2019/20108
M. Elango, K. Annamalai
The objective of this endeavor is to investigate the influence of graphite particles addition to the Al/SiC composites manufactured by stir casting method. Al/SiC/Gr hybrid metal matrix composites are preferred replacement for single reinforced composites by virtue of strengthened mechanical and tribological properties. A layered SiC/Gr composite material is required in gas turbine combustor can. Al/SiC/Gr composites are required in bearings, and pistons due to selflubrication, low wear rate and less friction. The inclusion of both strong reinforcement like SiC and smooth reinforcement like graphite enhances hardness and wear resistance of aluminium composites. The reinforcement content of graphite was varied from 2.5 to 7.5 wt % in a step of 2.5 wt. The SiC was fixed at 5 wt. % for all the three specimens, and Al6061 was used as matrix base material. The microstructure and EDAX analyses were required for three samples of hybrid metal matrix composites. Vickers hardness and porosity decreases for Al/SiC/Gr hybrid composites when percentage of graphite content increases. A review of surface modification of Al/SiC/Gr was done to find the different materials used for coating hybrid composites.
{"title":"Study on Microstructure and EDAX Analysis of Al/SiC/Gr Hybrid Metal Matrix Composites","authors":"M. Elango, K. Annamalai","doi":"10.18311/JSST/2019/20108","DOIUrl":"https://doi.org/10.18311/JSST/2019/20108","url":null,"abstract":"The objective of this endeavor is to investigate the influence of graphite particles addition to the Al/SiC composites manufactured by stir casting method. Al/SiC/Gr hybrid metal matrix composites are preferred replacement for single reinforced composites by virtue of strengthened mechanical and tribological properties. A layered SiC/Gr composite material is required in gas turbine combustor can. Al/SiC/Gr composites are required in bearings, and pistons due to selflubrication, low wear rate and less friction. The inclusion of both strong reinforcement like SiC and smooth reinforcement like graphite enhances hardness and wear resistance of aluminium composites. The reinforcement content of graphite was varied from 2.5 to 7.5 wt % in a step of 2.5 wt. The SiC was fixed at 5 wt. % for all the three specimens, and Al6061 was used as matrix base material. The microstructure and EDAX analyses were required for three samples of hybrid metal matrix composites. Vickers hardness and porosity decreases for Al/SiC/Gr hybrid composites when percentage of graphite content increases. A review of surface modification of Al/SiC/Gr was done to find the different materials used for coating hybrid composites.","PeriodicalId":17031,"journal":{"name":"Journal of Surface Science and Technology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42775533","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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