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Hot Corrosion Behaviour of Detonation Gun Sprayed Al2O3-40TiO2 Coating on Nickel Based Superalloys at 900°C 900℃下爆轰枪喷涂Al2O3-40TiO2涂层对镍基高温合金的热腐蚀行为
Indian Journal of Materials Science Pub Date : 2014-02-11 DOI: 10.1155/2014/453607
N. Mishra, Naveen Kumar, Srishti Mishra
{"title":"Hot Corrosion Behaviour of Detonation Gun Sprayed Al2O3-40TiO2 Coating on Nickel Based Superalloys at 900°C","authors":"N. Mishra, Naveen Kumar, Srishti Mishra","doi":"10.1155/2014/453607","DOIUrl":"https://doi.org/10.1155/2014/453607","url":null,"abstract":"Hot corrosion is the major degradation mechanism of failure of boiler and gas turbine components. These failures occur because of the usage of wide range of fuels such as, coal and oil at the elevated temperatures. Nickel based superalloys having excellent mechanical strength and creep resistance at elevated temperature are used under such environment but they lack resistance to hot corrosion at high temperature. To overcome these problems hot corrosion resistant coatings are deposited on these materials. In the current investigation Al2O3-40%TiO2 powder has been deposited on Superni 718 and AE 435 superalloys by Detonation Gun method. The hot corrosion performance of Al2O3-40%TiO2 coated as well as uncoated Superni 718 and AE 435 alloys has been evaluated in aggressive environment Na2SO4-82%Fe2(SO4)3 under cyclic conditions at an elevated temperature of 900°C. The kinetics of the corrosion is approximated by weight change measurements made after each cycle for total duration of 50 cycles. Scanning electron microscopy was used to characterize the hot corrosion products. The coated samples imparted better hot corrosion resistance than the uncoated ones. The AE 435 superalloy performed better than Superni 718 for hot corrosion in a given environment.","PeriodicalId":13278,"journal":{"name":"Indian Journal of Materials Science","volume":"34 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2014-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84695495","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: 10
Electrochemical Impedance Spectroscopy and Potentiodynamic Polarization Analysis on Anticorrosive Activity of Thiophene-2-Carbaldehyde Derivative in Acid Medium 噻吩-2-乙醛衍生物在酸性介质中防腐活性的电化学阻抗谱和动电位极化分析
Indian Journal of Materials Science Pub Date : 2014-02-02 DOI: 10.1155/2014/124065
Nimmy Kuriakose, Joby Thomas Kakkassery, V. P. Raphael, S. K. Shanmughan
{"title":"Electrochemical Impedance Spectroscopy and Potentiodynamic Polarization Analysis on Anticorrosive Activity of Thiophene-2-Carbaldehyde Derivative in Acid Medium","authors":"Nimmy Kuriakose, Joby Thomas Kakkassery, V. P. Raphael, S. K. Shanmughan","doi":"10.1155/2014/124065","DOIUrl":"https://doi.org/10.1155/2014/124065","url":null,"abstract":"The corrosion inhibition efficiency of thiophene-2-carbaldehyde tryptophan (T2CTRY) on mild steel (MS) in 1 M HCl solution has been investigated and compared using weight loss measurements, electrochemical impedance spectroscopy, and potentiodynamic polarization analysis. The Schiff base exhibited very good corrosion inhibition on mild steel in HCl medium and the inhibition efficiency increased with the increase in concentration of the inhibitor. The adsorption of the inhibitor on the surface of the corroding metal obeys Freundlich isotherm. Thermodynamic parameters (, Δ) were calculated using adsorption isotherm. Polarization studies revealed that T2CTRY acts as a mixed type inhibitor. A maximum of 96.2% inhibition efficiency was achieved by EIS studies at a concentration of 1 mM.","PeriodicalId":13278,"journal":{"name":"Indian Journal of Materials Science","volume":"57 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2014-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72821923","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: 13
Studies on Adsorption of DNA on Functional Ultrathin Films of Cationic Surfactant 阳离子表面活性剂功能超薄膜对DNA吸附的研究
Indian Journal of Materials Science Pub Date : 2014-01-12 DOI: 10.1155/2014/502429
Monika Poonia, Anagh Pathak, V. Manjuladevi, R. Gupta
{"title":"Studies on Adsorption of DNA on Functional Ultrathin Films of Cationic Surfactant","authors":"Monika Poonia, Anagh Pathak, V. Manjuladevi, R. Gupta","doi":"10.1155/2014/502429","DOIUrl":"https://doi.org/10.1155/2014/502429","url":null,"abstract":"We have investigated the interaction of DNA with a highly ordered functional ultrathin layer of cationic surfactant, dioctadecyl ammonium bromide (DOAB). The ultrathin film of DOAB is fabricated by Langmuir-Blodgett technique onto the pretreated quartz crystal wafers. The solution of DNA in phosphate buffer saline (PBS) is injected through a flow cell in a quartz crystal microbalance (QCM) loaded with the functional ultrathin film. The QCM data indicate a slower kinetics (time constant  =  162.2 seconds) for the adsorption of DNA on DOAB layer as compared to PBS on DOAB. The surface morphology of the aggregation of DNA over the DOAB layer is investigated using atomic force microscope (AFM). The AFM image indicates the trapping of DNA over the DOAB layer. Such trapping of DNA can be potentially employed in the field of genomics.","PeriodicalId":13278,"journal":{"name":"Indian Journal of Materials Science","volume":"148 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2014-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86028800","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
Comparison of the Strength of Binary Dislocation Junctions in fcc Crystals fcc晶体中二元位错结强度的比较
Indian Journal of Materials Science Pub Date : 2014-01-09 DOI: 10.1155/2014/715356
N. Verdhan, R. Kapoor
{"title":"Comparison of the Strength of Binary Dislocation Junctions in fcc Crystals","authors":"N. Verdhan, R. Kapoor","doi":"10.1155/2014/715356","DOIUrl":"https://doi.org/10.1155/2014/715356","url":null,"abstract":"Discrete dislocation dynamics were used to determine the relative strengths of binary dislocation junctions in fcc crystals. Equilibrium junctions of different types Lomer, glissile, coplanar, and collinear were formed by allowing parallel dislocations of unequal length to react. The strengths were determined from the computed minimum strain rate versus the applied shear stress plots. The collinear configuration was found to be the strongest and coplanar the weakest. It was seen that the glissile junction could exist as two variants depending on which parent slip system the shear stress is applied. One variant of the glissile junction was found to be as strong as the collinear configuration.","PeriodicalId":13278,"journal":{"name":"Indian Journal of Materials Science","volume":"97 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2014-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85765983","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: 6
Growth and Characterization of Agar Gel Grown Brushite Crystals 琼脂凝胶生长刷石晶体的生长与表征
Indian Journal of Materials Science Pub Date : 2014-01-08 DOI: 10.1155/2014/189839
V. B. Suryawanshi, R. T. Chaudhari
{"title":"Growth and Characterization of Agar Gel Grown Brushite Crystals","authors":"V. B. Suryawanshi, R. T. Chaudhari","doi":"10.1155/2014/189839","DOIUrl":"https://doi.org/10.1155/2014/189839","url":null,"abstract":"Brushite [CaHPO4·2H2O] or calcium hydrogen phosphate dihydrate (CHPD) also known as urinary crystal is a stable form of calcium phosphate. The brushite crystals were grown by single and double diffusion techniques in agar-agar gel at room temperature. Effects of different growth parameters were discussed in single diffusion and double diffusion techniques. Good quality star, needle, platy, rectangular, and prismatic shaped crystals in single diffusion and nuclei with dendritic growth were obtained in double diffusion. These grown nuclei were characterized by scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), and thermogravimetric analysis (TGA). SEM has shown the different morphologies of crystals; FTIR has confirmed the presence of functional groups; crystalline nature was supported by XRD, whereas the TGA indicates total 24.68% loss in weight and formation of stable calcium pyrophosphate (Ca2P2O7) at 500°C.","PeriodicalId":13278,"journal":{"name":"Indian Journal of Materials Science","volume":"21 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2014-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81430557","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: 21
Influence of Rare Earth Doping on Microstructure and Luminescence Behaviour of Sodium Sulphate 稀土掺杂对硫酸钠微观结构和发光性能的影响
Indian Journal of Materials Science Pub Date : 2014-01-06 DOI: 10.1155/2014/675417
Y. Vidya, B. N. Lakshminarasappa
{"title":"Influence of Rare Earth Doping on Microstructure and Luminescence Behaviour of Sodium Sulphate","authors":"Y. Vidya, B. N. Lakshminarasappa","doi":"10.1155/2014/675417","DOIUrl":"https://doi.org/10.1155/2014/675417","url":null,"abstract":"Na2SO4, Na2SO4: Li, and Na2SO4: Li, Eu, Dy phosphors were prepared by using slow evaporation technique followed by subsequent calcination at 400°C for 4 h. Doping with Li+ ion stabilized the thenardite phase of host matrix, while codoping with RE3+ stabilized the phase transformation from stable thenardite to metastable mirabilite crystal structure. The microstructure and morphology were studied by using scanning electron microscopy and transmission electron microscopy. The thermoluminescence studies revealed that isovalent doping of Li+ served as a quencher and addition of codopant introduces the additional trap sites in the host matrix. The room temperature emission spectra of Li-doped, RE3+-codoped, and undoped Na2SO4 were studied under ultraviolet radiation. For pure Na2SO4 the two peaks which appeared are at 364 and 702 nm, respectively. The emission intensities of RE3+-codoped samples increase with increase in dopant concentration.","PeriodicalId":13278,"journal":{"name":"Indian Journal of Materials Science","volume":"89 1","pages":"1-8"},"PeriodicalIF":0.0,"publicationDate":"2014-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84390428","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: 3
Electrical Conductivity Studies of Polyaniline Nanotubes Doped with Different Sulfonic Acids 不同磺酸掺杂聚苯胺纳米管的电导率研究
Indian Journal of Materials Science Pub Date : 2013-12-25 DOI: 10.1155/2013/718304
M. Khalid, M. A. Tumelero, I. S. Brandt, V. C. Zoldan, J. Acuña, A. A. Pasa
{"title":"Electrical Conductivity Studies of Polyaniline Nanotubes Doped with Different Sulfonic Acids","authors":"M. Khalid, M. A. Tumelero, I. S. Brandt, V. C. Zoldan, J. Acuña, A. A. Pasa","doi":"10.1155/2013/718304","DOIUrl":"https://doi.org/10.1155/2013/718304","url":null,"abstract":"Self-assembled polyaniline (PANI) nanotubes were prepared in the presence of three different sulfonic acids as dopant, namely, p-toluenesulfonic acid, camphorsulfonic acid, and tetrakis(4-sulfonatophenyl)porphyrin, by oxidative polymerization using ammonium peroxydisulfate as the oxidant. The morphology of the PANI nanotubes was determined by SEM and TEM and the electrical conductivity was measured as a function of temperature. The PANI nanotubes were also characterized by FTIR, XRD, UV-Vis, and cyclic voltammetry. We have found that the dopants had a noteworthy effect on the electrical conductivity whithout significant changes in the morphology of the PANI nanotubes.","PeriodicalId":13278,"journal":{"name":"Indian Journal of Materials Science","volume":"127 1","pages":"1-7"},"PeriodicalIF":0.0,"publicationDate":"2013-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75815923","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: 32
Fracture toughness reliability in polycarbonate: notch sharpening effects 聚碳酸酯的断裂韧性可靠性:缺口锐化效应
Indian Journal of Materials Science Pub Date : 2013-12-22 DOI: 10.1155/2013/187802
A. Salazar, Jesús Rodríguez, Antonio B. Martínez
{"title":"Fracture toughness reliability in polycarbonate: notch sharpening effects","authors":"A. Salazar, Jesús Rodríguez, Antonio B. Martínez","doi":"10.1155/2013/187802","DOIUrl":"https://doi.org/10.1155/2013/187802","url":null,"abstract":"The effect of the notch sharpening on the fracture toughness obtained under linear elastic fracture mechanics has been analyzed in an amorphous polycarbonate. The samples for fracture characterization were sharpened via the traditional contact steel razor blade technique and the noncontact femtosecond laser ablation technique. The values of the fracture toughness of the specimens sharpened through femtosecond laser ablation were lower than those measured on samples sharpened using a steel razor blade. Moreover, the former was in plane strain state, but the latter did not verify the size criterion. The damage produced ahead of the crack tip through plastic deformation in the steel razor blade sharpened samples over the lack of damage in the femtolaser sharpened specimens explains the differences in the fracture toughness. It has been proven that there is a relationship between the plastic deformation at the crack front and the stress state. This has been assessed through the application of a fracture criterion for dissipative systems with small scale yielding.","PeriodicalId":13278,"journal":{"name":"Indian Journal of Materials Science","volume":"128 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2013-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86593864","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Enhancement of Mechanical and Thermal Properties of Polylactic Acid/Polycaprolactone Blends by Hydrophilic Nanoclay 亲水性纳米粘土增强聚乳酸/聚己内酯共混物的力学和热性能
Indian Journal of Materials Science Pub Date : 2013-12-18 DOI: 10.1155/2013/816503
Chern Chiet Eng, N. Ibrahim, N. Zainuddin, H. Ariffin, W.Md.Z.W. Yunus, Y. Y. Then, C. C. Teh
{"title":"Enhancement of Mechanical and Thermal Properties of Polylactic Acid/Polycaprolactone Blends by Hydrophilic Nanoclay","authors":"Chern Chiet Eng, N. Ibrahim, N. Zainuddin, H. Ariffin, W.Md.Z.W. Yunus, Y. Y. Then, C. C. Teh","doi":"10.1155/2013/816503","DOIUrl":"https://doi.org/10.1155/2013/816503","url":null,"abstract":"The effects of hydrophilic nanoclay, Nanomer PGV, on mechanical properties of Polylactic Acid (PLA)/Polycaprolactone (PCL) blends were investigated and compared with hydrophobic clay, Montmorillonite K10. The PLA/PCL/clay composites were prepared by melt intercalation technique and the composites were characterized by X-ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Thermogravimetric Analysis (TGA), Dynamic Mechanical Analysis (DMA), Scanning Electron Microscopy (SEM), and Transmission Electron Microscopy (TEM). FTIR spectra indicated that formation of hydrogen bond between hydrophilic clay with the matrix. XRD results show that shifting of basal spacing when clay incorporated into polymer matrix. TEM micrographs reveal the formation of agglomerate in the composites. Based on mechanical properties results, addition of clay Nanomer PGV significantly enhances the flexibility of PLA/PCL blends about 136.26%. TGA showed that the presence of clay improve thermal stability of blends. DMA show the addition of clay increase storage modulus and the presence of clay Nanomer PGV slightly shift two of blends become closer suggest that the presence of clay slightly compatibilizer the PLA/PCL blends. SEM micrographs revealed that presence of Nanomer PGV in blends influence the miscibility of the blends. The PLA/PCL blends become more homogeneous and consist of single phase morphology.","PeriodicalId":13278,"journal":{"name":"Indian Journal of Materials Science","volume":"83 1","pages":"1-11"},"PeriodicalIF":0.0,"publicationDate":"2013-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77358937","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: 40
Structure and Thermal Stability of Copper Nitride Thin Films 氮化铜薄膜的结构和热稳定性
Indian Journal of Materials Science Pub Date : 2013-12-15 DOI: 10.1155/2013/725975
Guangan Zhang, Zhibin Lu, Jibin Pu, Guizhi Wu, Kaiyuan Wang
{"title":"Structure and Thermal Stability of Copper Nitride Thin Films","authors":"Guangan Zhang, Zhibin Lu, Jibin Pu, Guizhi Wu, Kaiyuan Wang","doi":"10.1155/2013/725975","DOIUrl":"https://doi.org/10.1155/2013/725975","url":null,"abstract":"Copper nitride (Cu3N) thin films were deposited on glass via DC reactive magnetron sputtering at various N2 flow rates and partial pressures with 150°C substrate temperature. X-ray diffraction and scanning electron microscopy were used to characterize the microstructure and morphology. The results show that the films are composed of Cu3N crystallites with anti-ReO3 structure. The microstructure and morphology of the Cu3N film strongly depend on the N2 flow rate and partial pressure. The cross-sectional micrograph of the film shows typical columnar, compact structure. The thermal stabilities of the films were investigated using vacuum annealing under different temperature. The results show that the introducing of argon in the sputtering process decreases the thermal stability of the films.","PeriodicalId":13278,"journal":{"name":"Indian Journal of Materials Science","volume":"1 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2013-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88990427","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: 9
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