Showing papers in "Transactions of The Indian Ceramic Society in 2018"
TL;DR: In this paper, a series of coupled ZnO-SnO2 photocatalyst was successfully synthesized in the Zn:Sn molar ratio of 20:1, 10: 1, 5:1 and 2:1 via co-precipitation method followed by calcination at different temperatures.
Abstract: A series of coupled ZnO-SnO2 photocatalyst was successfully synthesized in the Zn:Sn molar ratio of 20:1, 10:1, 5:1 and 2:1 via co-precipitation method followed by calcination at different temperatures. The synthesized materials were characterized by X-ray diffraction, diffuse reflectance spectra, scanning electron microscope and transmission electron microscope. Photocatalytic activitiy of synthesized materials was applied for the degradation of cibacron red dye in aqueous solution under UV-A light irradiation. Experimental results revealed that the coupled ZnO-SnO2 photocatalyst with Zn:Sn molar ratio 10:1, calcined at 600oC for 1 h was the most efficient photocatalyst among synthesized samples for the degradation of cibacron red. Superoxide anion radical (•O2–) was found to be the prominent active species responsible for degradation comparative to hole (h+), hydroxyl radical (•OH).
51 citations
TL;DR: Al2618 alloy composites containing 6 wt% nano B4C were prepared by liquid metallurgy two stage stir casting process Characterization was performed using scanning electron microscope to validate the homogenous distribution of nano B 4C particles in the Al2618 Alloy matrix The presence of B and C elements was confirmed by EDS analysis in the nano reinforced metal composites as discussed by the authors.
Abstract: Al2618 alloy composites containing 6 wt% nano B4C were prepared by liquid metallurgy two stage stir casting process Characterization was performed using scanning electron microscope to validate the homogenous distribution of nano B4C particles in the Al2618 alloy matrix The presence of B and C elements was confirmed by EDS analysis in the nano B4C reinforced metal composites The mechanical behavior of the prepared nano composites were evaluated as per the ASTM standards, and it was noted that the tensile strength (ultimate strength and yield strength) and compression strength increased with the addition of 6 wt% nano B4C particles Finally, to understand the failure mechanisms the fractography analysis was conducted on the broken tensile specimens by using SEM images
33 citations
TL;DR: In this paper, an attempt has been made to correlate the mechanical properties with microstructure and machining performance of zirconia toughened alumina composite fabricated from different ratios of Al2O3 with yttria stabilized ZIRconia (YSZ) powder for fabrication of cutting inserts.
Abstract: An attempt has been made to correlate the mechanical properties with microstructure and machining performance of zirconia toughened alumina composite fabricated from different ratios of Al2O3 with yttria stabilized zirconia (YSZ) powder. The developed 3 mol% YSZ powder has been mixed with Al2O3 in the ratios of 10:90, 15:85 and 20:80 for fabrication of cutting inserts. Study reveals the relation between microstructure of the composites with the mechanical properties, i.e. hardness, fracture toughness, flexural strength. Conventional lathe NH-26 is used to evaluate the machining performance, i.e. flank wear, surface roughness and cutting force of all three types of developed inserts by machining of AISI 4340 steel bar. The maximum hardness, 15.55 GPa, has been obtained for 90% Al2O3 with 10% YSZ. The maximum values of fracture toughness (5.96 MPa.m1/2) and flexural strength (510 MPa) are noticed for 80% Al2O3 with 20% YSZ. The analysis also shows that when the YSZ percentage increases, the smaller ...
26 citations
TL;DR: MFe2O4 (M = Mg, Ca, Ba) nanoparticles are successfully synthesized by two different synthesis routes in this paper, and the effects of calcination temperature and synthesis route on the optical and electrochemical p...
Abstract: MFe2O4 (M = Mg, Ca, Ba) nanoparticles are successfully synthesized by two different synthesis routes. The effects of calcination temperature and synthesis route on the optical and electrochemical p...
23 citations
TL;DR: In this paper, a systematic study on the influence of particle size and amount of quartz on mechanical and dielectric properties of electrical porcelain was performed, which revealed the formation of mullite, unsolved quartz and creation of microcracks and pores.
Abstract: The present work reports a systematic study on the influence of particle size and amount of quartz on mechanical and dielectric properties of electrical porcelain. The samples of electrical porcelain were elaborated using quartz, kaolin, clay, feldspar and zircon. The quartz was milled at 20, 30 and 45 h. Phase and microstructure evolution of the samples synthesized were characterized by X-ray diffraction, differential thermal analysis and scanning electron microscopy. The investigation revealed the formation of mullite, unsolved quartz and creation of microcracks and pores. Mechanical and dielectric strength measurements were performed on the samples sintered at 900o, 1000o, 1100o and 1275oC. The mechanical strength increased from 578.97 to 842.49 kg.cm–2 and the dielectric strength increased from 26.34 to 28.28, 28.77 to 32.24 and 30.32 to 36.27 kV.mm–1 for different milled times. The properties of electrical porcelain were attributed to the particle size of quartz.
9 citations
TL;DR: In this paper, a single step co-precipitation technique using mixture of precipitating agents was used to avoid agglomeration processes like spray drying and achieved a coating thickness of ∼100 µm.
Abstract: Plasma spraying is the most recommended spraying methodology for coating of biomedical alloys by Food and Drug Administration and the process requires flowable powders. In the present study, plasma sprayable grade hydroxyapatite (HAp) powder has been prepared by a single step co-precipitation technique using mixture of precipitating agents and thereby avoiding agglomeration processes like spray drying. HAp coating has been deposited on Ti-6Al-4V substrate using atmospheric air plasma spraying system to get a coating thickness of ∼100 µm. The synthesized powder and plasma sprayed coating exhibit crystallinity of 12% and 56%, respectively. The powder possesses good flowability and shows an average agglomerated particle size of 87 µm. The coating consists of fully melted regions and unmelted/partially melted regions. Biocompatibility studies carried out under in vitro conditions using 3T3 fibroblast cells indicate the non-toxic nature of coatings and supports adherence and growth of the cells. Plasma...
9 citations
TL;DR: In this paper, the sintering and crystallizatation properties of glass-ceramics have been studied by means of XRD, SEM, and mechanical properties tests.
Abstract: As an important advanced decoration material, glass-ceramics has attracted much attention. By means of XRD, SEM and mechanical properties tests, this research studied the sintering and crystallizat...
8 citations
TL;DR: In this paper, porous thick films of α-Al2O3 and γ-Al 2O3 ceramic materials have been investigated as moisture sensitive materials, and the properties of the porous films were investigated.
Abstract: In this work, porous thick films of α-Al2O3 and γ-Al2O3 ceramic materials have been investigated as moisture sensitive materials The thick film of synthesized α-Al2O3 was sensitive to a wide range of relative humidity (10%-95%), while γ-Al2O3 thick film with controlled micro and nano porosity was found to be effective in the detection of low concentration moisture, viz1-100 ppm The tape casting of α-Al2O3 and gel casting of γ-Al2O3 were carried out using organic additives and pore former additives, respectively Characterization of the synthesized materials was executed using X-ray diffraction, field emission scanning electron microscopy, atomic force microscope and Brunauer-Emmett-Teller surface area analysis The important parameters like humidity sensitivity, response and recovery time which determine the efficiency of the thick film sensors were found to be influenced by the microstructure of the final films Pore size distribution and surface area of the films were examined by Hg intrusion
8 citations
TL;DR: In this article, structural and optical studies of various morphologies of ZnO nanostructured (nanoparticles and nanorods) samples synthesized at low temperatures using novel microwave assisted hydrotor.
Abstract: We report the structural and optical studies of various morphologies of ZnO nanostructured (nanoparticles and nanorods) samples synthesized at low temperatures using novel microwave assisted hydrot...
8 citations
TL;DR: Mesoporous bioactive glass (MBG) nanopowders from SiO2-CaO-P2O5 system have been prepared by three different variations using different structure directing agents as discussed by the authors.
Abstract: Mesoporous bioactive glass (MBG) nanopowders from SiO2-CaO-P2O5 system have been prepared by three different variations using different structure directing agents: (1) through wet chemical method (...
7 citations
TL;DR: In this article, an attempt to correlate chemical, mineralogical, textural and physical properties of red clays of Morbi-Wankaner region, Gujarat (India) were made using various characterization technologies.
Abstract: In this work, an attempt to correlate chemical, mineralogical, textural and physical properties of red clays of Morbi-Wankaner region, Gujarat (India) were made using various characterization techn...
TL;DR: In this paper, the authors used phase pure three dimensional self assembly of magnesium hydroxide nanoparticle (3DSAMHNPs) for carcinogenic source of methylene blue dye in industrial wastewater.
Abstract: Methylene blue (MB) dye present in industrial wastewater is a well-known carcinogenic source. By utilizing phase pure three dimensional self assembly of magnesium hydroxide nanoparticle (3DSAMHNPs)...
TL;DR: In this article, the authors synthesize in the syst em BaFexTi1-xO3 using conventional solid state reaction method and characterized by X-ray diffraction (XRD), scanning ele...
Abstract: Compositions with x=0.03, 0.05 and 0.10 are synthesized in the syst em BaFexTi1–xO3 using conventional solid state reaction method and characterized by X-ray diffraction (XRD), scanning ele...
TL;DR: In this article, the authors have shown that the energy absorption properties can be significantly enhanced through encapsulation and infiltration of bare foam with epoxy resin, which can be used for a wide range of thermo-structural applications.
Abstract: Cellular ceramic structures, due to their unique combination of thermal, structural and mechanical properties, are widely explored for the wide range of thermo-structural applications. However, the ceramic based structures have not been well explored for energy absorption properties due to their inherent brittleness. In the present study, alumina based ceramic foams were fabricated by polymeric sponge replication process and further these foams were encapsulated and infiltrated respectively in epoxy resin. All the three foams – bare, encapsulated and infiltrated were evaluated comparatively under quasistatic compression and dynamic impact conditions. The study revealed that the energy absorption properties can be significantly enhanced through encapsulation and infiltration of bare foam with epoxy resin. Extent of enhancement in energy absorption in case of infiltration was superior in comparison to encapsulation in both static and dynamic test conditions. The study demonstrated the possibility of...
TL;DR: In this paper, a liquid phase sintering (LPS) often yields an amorphous grain boundary region which deteriorates the high temperature properties of the sintered ceramics and thus ceramists prefer to obtain a...
Abstract: Liquid phase sintering (LPS) often yield an amorphous grain boundary region which deteriorates the high temperature properties of the sintered ceramics and thus ceramists prefer to obtain a...
TL;DR: In this article, a lead free relaxor 0.8NBT-0.2BT nano-structured ceramic composition was processed through solgel technique and sintered at 1140°C for 4 h in air.
Abstract: Lead free relaxor 0.8NBT-0.2BT nano-structured ceramic composition was processed through sol-gel technique and sintered at 1140°C for 4 h in air. The bulk density exceeded 95% of theoretical densit...
TL;DR: In this paper, a simple chemical precipitation route was used to obtain the self-assembly and growth of Mg(OH)2 nanoparticles, which were subsequently characterized by XRD, FTIR, BET, pore size distribution, FESEM and TEM analysis techniques.
Abstract: Here we report for the first time the time-dependent mechanisms of self assembly and growth of Mg(OH)2 nanoparticles. For this purpose, the nanopowders are obtained by a simple chemical precipitation route. To understand the route map of the growth process; the nanopowders are subsequently characterized by XRD, FTIR, BET, pore size distribution, FESEM and TEM analysis techniques. Based on the results obtained from aforesaid characterizations the mechanisms of self-assembly and nanoplatelets growth process as a function of reaction time are explained.
TL;DR: The structural, ferroelectric, piezoelectric and dielectric properties of lead-free 0.45Ba0.92Ca0.08TiO3-0.04O3 (BCT8-BZT4) ceramics synthesized by conventional solid state reaction method have been reported in this paper.
Abstract: The structural, ferroelectric, piezoelectric and dielectric properties of lead-free 0.45Ba0.92Ca0.08TiO3-0.55BaTi0.96Zr0.04O3 (BCT8-BZT4) ceramics synthesized by conventional solid state reaction method have been reported. Structural analyses by X-ray diffraction (XRD) and Raman spectroscopic measurements indicate that the BCT8-BZT4 ceramics possesses both tetragonal (space group P4mm) and orthorhombic (space group Amm2) crystal structures at room temperature. Dense microstructure with 5-7 µm grain size has been observed from scanning electron micrographs. Ferroelectric nature of BCT8-BZT4 has been confirmed from the polarization-electric field (P-E) hysteresis loop measurements. For BCT8-BZT4, the values of maximum polarization (Pmax=17.24 µC/cm2), remnant polarization (Pr=6.36 µC/cm2), coercive electric field (Ec=3.66 kV/cm) and direct piezoelectric coefficient (d33∼220 pC/N) have been observed to be comparable with those of lead based piezoelectric ceramics. The BCT8-BZT4 ceramics shows usual d...
TL;DR: In this paper, nano-structured and nano-porous mixed ionic and electronic conducting Ba0.5Sr 0.5Co 0.8Fe0.2O3δ (BSCF) cathodes with an average grain size ∼500 nm and porosity ≤30% were processed from sol-gel metho...
Abstract: Nano-structured and nano-porous mixed ionic and electronic conducting Ba0.5Sr0.5Co0.8Fe0.2O3–δ (BSCF) cathodes with an average grain size ∼500 nm and porosity ≤30% were processed from sol-gel metho...
TL;DR: In the common industrial range of water/plaster ratio to make plaster molds for slip casting of sanitaryware (from 66 to 82 parts of water /100 parts of plaster by weight), rheology of the initial p...
Abstract: In the common industrial range of water/plaster ratio to make plaster molds for slip casting of sanitaryware (from 66 to 82 parts of water/100 parts of plaster by weight), rheology of the initial p...
TL;DR: The composite materials with composition xNa0.5K0.9 and 1.0 are combination of ferroelectric Na 0.5NbO3 (NKN) and ferrimagnetic CoFe2O4 (CF... as mentioned in this paper.
Abstract: The composite materials with composition xNa0.5K0.5NbO3-(1–x)CoFe2O4 with x = 0.2, 0.4, 0.5, 0.6, 0.8, 0.9 and 1.0 are combination of ferroelectric Na0.5K0.5NbO3 (NKN) and ferrimagnetic CoFe2O4 (CF...
TL;DR: CeO2 nanoparticles were dispersed on hexagonal boron nitride (hBN) supports by a rotary chemical vapor deposition method using Ce(DPM)4 as a precursor at 600°C, and extra oxygen was introduced to assist the decomposition and oxidation of the precursor as discussed by the authors.
Abstract: CeO2 nanoparticles were dispersed on hexagonal boron nitride (hBN) supports by a rotary chemical vapor deposition method using Ce(DPM)4 as a precursor at 600°C, and extra oxygen was introduced to assist the decomposition and oxidation of the precursor. A significant composition and structure dependent nature was observed on the oxidation supply rate by eliminating the organic molecules and fragments and assisting the decomposition of the Ce(DPM)4 precursor. The CeO2 nanoparticles were 10-15 nm in diameter, with the measured spacings of the lattice fringes as 0.31 and 0.27 nm, corresponding to (111) and (200) plane, respectively, which are in agreement with the standard data (JCPDS: 34-0394). In addition, with the oxidative decomposition of precursor Ce(DPM)4, CeO2 nanoparticles were produced and then coated on the ceramic surface through the CVD method, presenting the preferred orientation. The deposition mechanism was also discussed.
TL;DR: In this paper, the effect of nanosized YSZ and sintering method on the crystal structure and microstructures of coated materials were studied by X-ray diffraction and scanning electron microscopy.
Abstract: In this study, YSZ nanopowder for gas turbine blades was used to deposit a film on Ni-based superalloy with electrospray deposition method. Then, the coated substrates were sintered with high-frequency induction heated sintering system which is yet not so popular in this field. Effect of nanosized YSZ and sintering method on the crystal structure and microstructures of coated materials were studied by X-ray diffraction and scanning electron microscopy. The best parameters for ESD of YSZ in 2-propanol were achieved at an applied potential of 7 kV, a flow rate of 0.05 mL/min and at aduration of 15 min. Results showed that YSZ coating was highly dense with non-cracked surface, uniform in thickness at 15 min total sintering time. Surface roughness, microhardness, and resistance to friction were measured as 0.41 μm, 348 HV and 0.14, respectively.
TL;DR: In this paper, the parameters affecting scratch resistance behavior of porcelain glazes in terms of quartz particle size and distribution were investigated, and a series of quartz samples with different particle sizes and distributions were fired according to the semitransparent porcellain production heat treatment cycle.
Abstract: Scratch resistance is an important parameter to meet the criteria for purchasing the tableware glazes at the hotels, restaurants and cafes. Scratch resistance of porcelain glazes depends on the smoothness of the surface. Smoothness of the glaze surface is influenced by chemical and physical properties of the corresponding components. In this study, the parameters affecting scratch resistance behavior of the glaze in terms of quartz particle size and distribution were investigated. Furthermore, semitransparent porcelain glazes formed at 1250°C were prepared by using a series of quartz samples with different particle size and distribution. The glaze samples were fired according to semitransparent porcelain production heat treatment cycle and characterized in terms of thermal and microstructural behavior by digital microscopy, differential thermal analyses, hot stage microscopy, X-ray diffraction and scanning electron microscopy.
TL;DR: In this paper, nano gold and nano gold-erbium (Au-Er) co-embedded potassium zinc silicate based monolithic plasmonic glass nanocomposites have been evaluated.
Abstract: In this paper, nano gold (Au) and nano gold-erbium (Au-Er) co-embedded potassium zinc silicate based monolithic plasmonic glass nanocomposites have been evaluated. These plasmonic glass nanocomposi...
TL;DR: A hybrid photocatalyst, HAp-TiO2-ZnO by co-integrating TiO2 and ZnO into host material hydroxyapatite (HAp), was proposed in this paper.
Abstract: We, for the first time report the development of a hybrid photocatalyst, HAp-TiO2-ZnO by co-integrating TiO2 and ZnO into host material hydroxyapatite (HAp). High temperature calcination of the ing...
TL;DR: LiCo1-xMnxO2 (x=0.0) is prepared by solid state and sol-gel reaction methods as discussed by the authors, and structural studies of all the powders calcined at 850°C temperature for 20 h in the air are undertaken through powder X-ray diffraction.
Abstract: Present work aims at improving the characteristics of cathode material LiCo1–xMnxO2 for Li-battery by increasing the concentration of manganese. The titled compound LiCo1–xMnxO2 (x=0.0(LCO), 0.2(LCM2), 0.4(LCM4), 0.6(LCM6), 0.8(LCM8) and 1.0(LMO)) is prepared by solid state and sol-gel reaction methods. The structural studies of all the powders calcined at 850°C temperature for 20 h in the air are undertaken through powder X-ray diffraction. The diffraction patterns of these compounds are consistent with the reported patterns and exhibit predominant peak (0 0 3) orientation at 2θ = 19.08° and also other characteristic planes. The lattice parameters and the density are also reported. The surface morphological studies carried out using scanning electron microscope indicates average grain size of around 600 nm. FTIR studies show characteristic vibrations at 253, 304, 823, 1402 and 1619 cm–1 in the material. DC conductivity studies of the samples are measured from room temperature to 500°C and activation ener...
TL;DR: In this article, the authors focused on an overview of the miserite and analyzing factors affecting the glass-ceramics (GC) and its structures, using a variety of chemical formulae.
Abstract: The aim is focused on an overview of the miserite and analyzing factors affecting the miserite glass-ceramics (GC) and its structures. Many chemical formulae have been used based on varying...
TL;DR: In this article, the influence of Sb doping on the dielectric properties of NaCu3Ti3NbO12 ceramics was investigated in order to investigate the effect of SBS doping on dielectrics.
Abstract: In order to investigate the influence of Sb doping on the dielectric properties of NaCu3Ti3NbO12 ceramics, a series of NaCu3Ti3Nb1–xSbxO12 ceramics were prepared by conventional solid-state reactio...
TL;DR: In this article, the energy levels, transition configuration and numerical model of cobalt ion-doped fiber is proposed and analyzed, and a three-level system is employed to model the amplified spontaneous emission (ASE) of the doped fiber pumped at 550 nm, and the rate and power propagation equations are solved to analyze the effect of fiber length, active ion concentration, pump power and temperature on the ASE.
Abstract: ABSTRACT In this work, the energy levels, transition configuration and numerical model of cobalt ion-doped fiber is proposed and analyzed. A three-level system is employed to model the amplified spontaneous emission (ASE) of the doped fiber pumped at 550 nm, and the rate and power propagation equations are solved to analyze the effect of fiber length, active ion concentration, pump power and temperature on the ASE. It is shown that the fiber has an ultra-broadband ASE in 1100-1900 nm range, which will be promising for fiber communication system, fiber sensor and medical imaging. GRAPHICAL ABSTRACT