Journal of Surface Science and Technology最新文献_第7页

Wear and Hardness Studies of Graphene Decorated with Graphene Quantum Dots (G-D-GQD) Embedded Epoxy Nano Composites 石墨烯量子点（G-D-GQD）嵌入环氧纳米复合材料修饰石墨烯的磨损和硬度研究

Journal of Surface Science and Technology Pub Date : 2019-06-25 DOI: 10.18311/JSST/2019/20103

Manuel George, A. Mohanty

{"title":"Wear and Hardness Studies of Graphene Decorated with Graphene Quantum Dots (G-D-GQD) Embedded Epoxy Nano Composites","authors":"Manuel George, A. Mohanty","doi":"10.18311/JSST/2019/20103","DOIUrl":"https://doi.org/10.18311/JSST/2019/20103","url":null,"abstract":"The paper discusses about the wear and micro hardness behavior of Graphene Decorated with Graphene Quantum Dots (G-D-GQD) reinforced epoxy composites. The samples were prepared by open mold casting method by adding 0.25–1 wt. % (in an interval of 0.25%) of GDGQD and evaluated on a reciprocating wear tester configuration for wear and coefficient of friction properties. The micro-hardness testing of the G-D-GQD particles embedded epoxy composites has been performed and the hardness value results were compared with neat epoxy to find the improvement in hardness. Significant improvements in the hardness and wear resistance of the epoxy nanocomposites was obtained by the embedding of G-DGQD fillers, which is due to the efficient bonding of GDGQD filler with the epoxy matrix. Scanning Electron Microscope (SEM) images of the worn composites were analysed to get an insight into the morphology of the surfaces. Furthermore, the coefficient of friction of the composites got increased with the wt. % of fillers in the base material, but due to the superior bond strength and lesser agglomeration of the particles, the Vicker's hardness improved and the wear loss reduced. Hence the surface area coverage of G-D-GQDs got a significant role in the reduced wear loss and thereby coming to a threshold value. The study concludes by suggesting that 0.25 wt. % GDGQD/epoxy composites shown a least wear rate and increased hardness of 0.023% and 26%, respectively thereby suggesting application involving reduced wear rates.","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":"43639101","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

Surface Modification of AISI 1018 Low Carbon Steel by Duplex Treatment of Nitrocarburizing and Post-Oxidation 氮碳共渗和后氧化复合处理对AISI 1018低碳钢表面的改性

Journal of Surface Science and Technology Pub Date : 2019-06-25 DOI: 10.18311/JSST/2019/22173

J. Sharma, B. S. Sidhu, Rajesh Gupta

引用次数: 1

Physical Investigations on (MoO3)x-(WO3)1-x Composite Thin Films (MoO3)x-(WO3)1-x复合薄膜的物理研究

Journal of Surface Science and Technology Pub Date : 2019-06-25 DOI: 10.18311/JSST/2019/18461

K. Srinivasarao, C. Prameela

{"title":"Physical Investigations on (MoO3)x-(WO3)1-x Composite Thin Films","authors":"K. Srinivasarao, C. Prameela","doi":"10.18311/JSST/2019/18461","DOIUrl":"https://doi.org/10.18311/JSST/2019/18461","url":null,"abstract":"Thin films of (MoO3)x-(WO3)1-x (x = 0.4, 0.6, 0.8) were deposited on glass and silicon (100) substrates by flash evaporation technique. The purpose of the flash evaporation is to prevent the decomposition of composite into individual species during thin film deposition. The films were deposited at the oxygen partial pressures of 2x10-5, 2x10-4 mbar and substrate temperatures of 150 0C, 350 0C. The deposited films were characterized for their structure by Graging Incidence X-ray Diffraction (GIXRD), microstructure by Field Emission Scanning Electron Microscopy (FESEM), optical property by UVVis spectra. The X-ray diffraction reveals that the (MoO3)x-(WO3)1-x composite thin film crystallizes in orthorhombic and monoclinic phases. At lower oxygen partial pressures of 2x10-5 mbar and lower substrate temperatures of 150 0C the film crystallizes in orthorhombic and tetragonal phases. Whereas at higher substrate temperatures of 350 0C both orthorhombic and monoclinic mixed phases are present. The optical transmittance spectra of the films were recorded in the wavelength range 300-1100 nm. The optical energy gap of the films is 3.05 eV and increases to 3.21 eV with increase in MoO3 concentration. The width of localized states is 0.47 eV and decreasing with increasing MoO3 concentration. The oxide materials in thin film form exhibit the change in the transmittance when exposed to electro magnetic waves (EM) of visible region. In this respect the estimation of color centre concentration will give the information regarding the response of the films to change their transmittance when exposed to EM waves in the visible region. The colourcenter concentration of the films (for x = 0.4) deposited at 150 0C and irradiation time of 120 minutes, is 3.02 x 1017/cm3 and reaches to maximum value of 4.94 x 1017/cm3, (for x = 0.8) when deposited at 350 0C and irradiated for 150 minutes.","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":"44808098","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

Improvement in the Tribological Properties of AISI D2 Die Steel by DLC and WC-C Coatings DLC和WC-C涂层对AISID2模具钢摩擦学性能的改善

Journal of Surface Science and Technology Pub Date : 2019-06-01 DOI: 10.18311/JSST/2019/20110

S. Sivarajan, R. Padmanabhan, A. Sharma

引用次数: 0

Optimization Condition for Aluminum Alloy 6066 Anodizing 6066铝合金阳极氧化工艺条件的优化

Journal of Surface Science and Technology Pub Date : 2019-01-03 DOI: 10.18311/JSST/2018/19839

Hossam Jalal, Yones Saoud, F. Karabet

{"title":"Optimization Condition for Aluminum Alloy 6066 Anodizing","authors":"Hossam Jalal, Yones Saoud, F. Karabet","doi":"10.18311/JSST/2018/19839","DOIUrl":"https://doi.org/10.18311/JSST/2018/19839","url":null,"abstract":"The choice of suitable aluminum alloys for a particular application involves tensile strength, density, softness, formability, operability, welding ability, corrosion resistance, etc. Aluminum alloys are widely used in aircraft because of the high strength to weight ratio. The anodizing process of AA has been applied industrially to improve corrosion resistance. In this research, various factors such as (concentration of the electrolyte, temperature, and voltage) affect thickness and hardness during anodizing of AA6066 in sulphuric acid. Process factors have been modified using the Taguchi method through the Design of Experiments (DOE). The Taguchi method includes an orthogonal array of factors, a Signal-to-Noise ratio (S/N), Analysis of Variance (ANOVA), which were used to determine the optimum condition levels for aluminum alloy 6066 anodizing, and to analyze the effect of these conditions on thickness and hardness. It was found that the most effective factor on thickness and micro-hardness is the concentration of the electrolyte. Optimization test was carried out by Taguchi optimization test and the optimal conditions were determined. Finally, the anodizing was carried out on aluminum sample under the optimal conditions then scanned by SEM. The thickness and micro hardness obtained at the optimal conditions were 25μm, and 640Hv, respectively.","PeriodicalId":17031,"journal":{"name":"Journal of Surface Science and Technology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49538230","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

Experimental Investigation to Enhance the Performance of High Speed Reduction Gearbox using Nano Blended Lubricants 纳米混合润滑油提高高速减速箱性能的实验研究

Journal of Surface Science and Technology Pub Date : 2018-12-03 DOI: 10.18311/JSST/2018/16222

Isai Dharma Rao, C. Prasad, K. Santarao

{"title":"Experimental Investigation to Enhance the Performance of High Speed Reduction Gearbox using Nano Blended Lubricants","authors":"Isai Dharma Rao, C. Prasad, K. Santarao","doi":"10.18311/JSST/2018/16222","DOIUrl":"https://doi.org/10.18311/JSST/2018/16222","url":null,"abstract":"The sliding motion between worm and worm wheel is the inherent factor that makes the worm and worm wheel drives less efficient among all the gear drives. Efficiency of these gears varies between 40 to 90%. They need good lubricants, which has high heat dissipation capacity and low coefficient of friction for improving the efficiency. The lubricants considered in the current investigation play a significant role in decreasing the power losses in gearbox besides the geometry of the gears. Nano blended lubricants are found to have efficient tribological and thermal physical properties such as, less frictional coefficient and high heat transfer coefficient. Al 2 O 3 Nano particles of 30 nm size dispersed in SAE 140 mineral oil at different volume fractions resulted decrease in frictional coefficient and found varying from 0.1 to 0.5% nano particle volume fractions. Further, heat transfer coefficient is enhanced by 46.35% for volume fraction of 0.5% and also temperature rise of nano blended lubricant was found to be less than that of base lubricant. The overall efficiency of the selected gearbox with which the experimentation has been done was found to be increased with usage of nano blended lubricant. The performance of the gearbox using nano lubricant at 0.5 volume percent is found improved by 4.85 and 7.86% at operating temperatures 35 and 60 o C, respectively compared to the performance of the gearbox using base lubricant.","PeriodicalId":17031,"journal":{"name":"Journal of Surface Science and Technology","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67530332","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

Dielectric Properties of Composites of Polypropylene with Zno-TiO2 Core-Shell Nanoparticles 聚丙烯- Zno-TiO2核壳纳米颗粒复合材料的介电性能

Journal of Surface Science and Technology Pub Date : 2018-12-03 DOI: 10.18311/JSST/2018/20118

R. Sampathkumar, A. Aswathy, V. Balachandar

{"title":"Dielectric Properties of Composites of Polypropylene with Zno-TiO2 Core-Shell Nanoparticles","authors":"R. Sampathkumar, A. Aswathy, V. Balachandar","doi":"10.18311/JSST/2018/20118","DOIUrl":"https://doi.org/10.18311/JSST/2018/20118","url":null,"abstract":"Composites of polypropylene with different weight percentages of ZnO-TiO 2 core-shell nanoparticles were prepared by the combination of solution and mixture melting methods. Dielectric properties of polypropylene composite films were studied at frequencies ranging from 50 Hz to 5 MHz at four different temperatures (313, 333, 353, and 373 K). It is observed that the dielectric constant reduces quickly in the low-frequency range followed by a near frequency independent behavior above 1 KHz. The dielectric properties of composites at low frequency can be explained by interfacial polarization or Maxwell-Wagner-Sillars effect. It is also observed that the dielectric constant reaches the maximum value at 3 wt% of ZnO-TiO 2 , which is the percolation threshold of nanocomposite. As the weight percentage of ZnO-TiO 2 increases beyond the percolation threshold up to 7%, the dielectric constant of the nanocomposites decreases. The dielectric loss of the composites follows the similar trend with frequency as the dielectric constant. A sharp increase in the dielectric loss of the nanocomposite observed near the percolation threshold is due to leakage current produced by the formation of conductive network by ZnO-TiO 2 core-shell nanoparticles. Further, peaks in the loss tangent observed for the nanocomposite systems indicating the appearance of a relaxation process. These relaxations peaks were shifted to higher frequencies as the particle content increased, since relaxation processes were influenced by the interfacial polarization effect which generated electric charge accumulation around the ZnO-TiO 2 core-shell nanoparticles.","PeriodicalId":17031,"journal":{"name":"Journal of Surface Science and Technology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48179593","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

Influence of In-Situ Annealing of Si-Rich Silicon Carbide Thin Films 原位退火对富硅碳化硅薄膜的影响

Journal of Surface Science and Technology Pub Date : 2018-12-03 DOI: 10.18311/JSST/2018/20097

S. Baskar, P. Nalini

引用次数: 0

Surface Modification of Fly Ash by Poly(1,5-Diaminonaphthalene) for Removal of Hexavalent Chromium from Water 聚(1,5-二氨基萘)改性粉煤灰去除水中六价铬的研究

Journal of Surface Science and Technology Pub Date : 2018-12-03 DOI: 10.18311/JSST/2018/20171

D. T. Nguyen, Minh X. Vu, H. Nguyen

引用次数: 1

Anodic Behaviour of Ti-12 in Various Electrolytes Ti-12在各种电解质中的阳极行为

Journal of Surface Science and Technology Pub Date : 2018-12-03 DOI: 10.18311/JSST/2018/16027

U. Raghavender, K. Kumar, E. R. Reddy, A. Reddy

引用次数: 1