Papers by Keyword: EDS

Abstract: The most common titanium alloy used in combination with additive manufacturing is Ti-6Al-4V ELI. On the other hand, the 3D printing of β-Ti alloys is still in the stage of development of both materials and their treatment. The newly developed biomedical Ti alloys are often containing Nb, Ta, Zr. These alloys are showing very good values in terms of biocompatibility and corrosion resistance while their elastic modulus may be in the range of 30-70 GPa. The printing of these alloys is however limited by their relative novelty. Powders are not yet available through traditional commercial ways. In this work, Ti–24Nb–8Ta–4Sn specimens prepared by the selective laser melting (SLM) method were used. The porosity was evaluated by two methods: area porosity evaluated by image analysis on metallographic specimens and volume porosity evaluated by micro-computed tomography (μCT). The microstructure was observed using both light and scanning electron microscopy (SEM). The SEM was as well used for energy dispersive spectroscopy (EDS) for chemical analysis and the analysis of crystallographic orientation was conducted using the method of electron backscattered diffraction (EBSD).

Abstract: The investment casting into a ceramic shell of magnesium alloys brings several difficulties, one of which is the high reactivity of some magnesium alloys with the often-used ceramic shells. In the group of these potentially problematic alloys belong the AZ91 magnesium alloy too. This paper aims to describe the interaction of magnesium melt with ceramic shell, especially from the point of view of manufacturing problems on the surface of emerging defects with reduced corrosion resistance. Samples of AZ91 magnesium alloy castings in as-cast and heat-treated were microstructurally evaluated. Surface defects were analysed using light and scanning electron microscopy, including their EDX chemical microanalysis.

Abstract: Scanning electron microscopy - energy dispersive X-ray spectrometry (SEM-EDS) is an elemental analysis technique widely used in various fields to identify any element in the periodic table except H, He and Li. It can be a quick way to assess the response of sensing films before deposition on sensing devices. Sensing films are usually organic thin films, but quantitative analysis of light elements and thin films is not recommended for SEM-EDS due to its limitations. In this study, SEM-EDS analysis of nitrogen in layer-by-layer polymeric thin film was optimized. The films were analyzed containing nitrogen in the form of nitrate counterions or as part of the repeat unit of the polymer. The build-up of the layer was verified by thickness measurement using atomic force microscopy. The results show that the limit for nitrogen concentration detection using nitrates was 2% by mass. Below this concentration, nitrogen content had no quantifiable response in either calculated nitrogen concentration by standardless correction methods or intensity of N Kα X-ray line. However, by adding nitrate ions to a film that already contains nitrogen in its structure the concentration was raised to 13.75%. In the range of 9.63 to 13.75%, a nonlinear response was observed using calculated nitrogen concentration while the response was linear with intensity of N Kα.

Abstract: Utilization of agricultural by products as a reinforcement which offers a effective consequences on composite materials in the present days. Also a number of the agro waste substances as an ash are secondary filler material for Metal matrix composite materials. In this paper observe changed into achieved on characterization of agriculture waste ashes like Rice husk ash (RHA) and ASA (Areca sheath ash), burned at Controlled temperatures at 650°C in a metallurgical furnace at 3 exceptional durations of instances like 1hr, 2hr, and 3hr. Also each ashes were chemically and physically characterized, consequently decide the proportion of composition. The ensuing ashes have been analyzed the use of chemical evaluation via XRF and volumetric, gravimetric and instrumental test, SEM and EDS to determine their chemical composition which may be similarly used as reinforcement with metal matrix composites. Results acquired that impact of burning temperature and time on Chemical composition, Physical property, Loss of ignition (LOI) and Density. The ashes have been discovered to include excessive percent of silica content of 90% to 92% in Rice husk ash and 74% to 78% in Areca palm leaf sheath ash, after which accompanied through alumina content of 0.89% to 0.98% in each substances at 650^oc temperatures respectively, additionally density of 0.98gm/cc for RHA and 1.12gm/cc Areca palm leaf sheath ash. Loss on ignition (LOI) of 4.5% to5.5% acquired on the equal temperature. These consequences suggests that rice husk ash and Areca sheath ash include excessive percent silica and a few alumina and may be utilized in chemical formulations requiring silica which include in metal matrix composites.

Abstract: Since the 21st century, the development of automotive and home appliance industries has greatly contributed to the prosperity of the plastics industry, which has led to an increasing demand for molding molds. In the production process, the molds will be impacted, worn and corroded, especially in the production of plastic products made of PVC, fluoroplastics and flame retardant ABS, etc. The molds will be corroded by the corrosive gases generated such as hydrogen chloride, hydrogen fluoride and sulfur dioxide, which requires plastic molds to have a certain degree of corrosion resistance while ensuring strong toughness.S136 SUP is a modified martensitic stainless steel based on S136 from ASSAB, Sweden, which has fine-tuned the content ratio of some elements to ensure a certain strength and high toughness at the same time. The chemical composition, heat treatment and microstructure of the steel have a certain influence on its corrosion resistance, and the tempering temperature of the heat treatment has a greater influence on the corrosion resistance of martensitic stainless steel. Therefore, in this paper, the microstructure and corrosion resistance of S136 SUP at different tempering temperatures are explored and studied.

Abstract: The deposition of Zinc Sulfide (ZnS) thin films is optimized using a radio-frequency (RF) magnetron sputtering technique with variable RF power to minimize deposition steps and lower the fabrication costs. Room temperature as-deposited film growth optimization is conducted by studying their structural, morphological, optical, and electrical properties. The target power and deposition rate were related by a slope of 0.1648 and a linear correlation coefficient (R) of 0.9893. Only one significant peak for the films in the XRD pattern indicated that the films are of a single crystalline structure. All the deposited thin films exhibited a ZB structure. It is observed that the micro-strain ranged from 36.00x10^-3 to 4.14x10^-3, and that of dislocation density ranged from 6.68 to 0.08 Line/cm². The optical energy band gaps of as-deposited ZnS films at different deposition power were found from 3.31 to 3.37 eV. The average transmittance percentage was increasing from 71.63% to 84.29%, above 400 nm wavelength. The films exhibited n-type conductivity with bulk carrier density in the order of 10¹² cm^-3. The carrier concentration and mobility ranged from 2.84x10¹¹ to 3.98x10¹² cm^-3 and 1.06 to 27.68 cm²/Vs, respectively. The minimum and maximum resistivity of 1.01x10⁴ and 2.52´10⁵ Ω-cm were noted for the film deposited at 90 and 60W power, respectively.

Abstract: Herein, the spinel Co_1-xZn_xFe₂O₄ (x = 0.0, 0.2, 0.4 and 0.6) powder samples have been prepared by the solid-state reaction method. We have carried out the measurements of crystal structure, element analysis, material characterization, magnetic property and Curie temperature using the X-ray diffraction (XRD), Energy-dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS) and vibrating sample magnetometer, and the first-principles calculations within the framework of the density functional theory (DFT). The EDS measurement indicates that the Co_1-xZn_xFe₂O₄ powder samples have been successfully synthesized and exhibited the cubic spinel structures. Both the lattice constant and crystallite size increase with the Zn concentration due to the larger ionic radius of Zn²⁺ ion than the Co²⁺ ion. The concentration ratio of the Co²⁺ and Co³⁺ ions can be predicted by the distribution of cations between the A and B sites by the XPS measurement. For the magnetic properties, the residual magnetization, coercivity and Curie temperature decrease monotonically as the Zn concentration increases, while the saturation magnetization initially increases and then decreases at the room temperature. For the Co_0.8Zn_0.2Fe₂O₄ sample, the magnetic saturation reaches the maximum value of 62.98 Am²kg^-1, due to a large amount of the Co³⁺ ions. The adequate replacement of Zn ion for the Co site can improve the magnetic properties of spinel Co_1-xZn_xFe₂O₄ powders, and effectively regulates the Curie temperature.

Abstract: Basing on the study of adsorption behavior of glycidoxypropyl-trimethoxy-silane (GTMS), pretreatment method of AA2024-T3 aluminum alloy for sol-gel films was optimized. The morphology, composition and corrosion protective performance of alloy coated with the films were investigated by using FE-SEM, EDS, AFM and EIS. The results showed that the Al matrix exhibited better ability to adsorb GTMS molecules than the second phase particles, especially at lower concentration of GTMS. Further, the 5% GTMS films cover the whole surface, but the selective adsorption behaviors still exist. It was concluded that less second phase particles and smoother surface were benefit to the sol-gel films on aluminum alloy. Depending on this conclusion, the pretreatment method for sol-gel films was optimized. The optimized surface condition conducted with 50 g•L^-1 sodium hydroxide and ultrasound at 60 oC for 30 s was obtained. These samples coated with the sol-gel films revealed good anti-corrosion performance. The coverage degree of the films was up to 97.95 %.

Abstract: A method for the identification of graphene materials in fibers by high-resolution transmission electron microscopy (HRTEM)-Energy Dispersive Spectroscopy (EDS) has been reported. Two ways to prepare samples are available, namely the dissolution extraction and the ultra-thin sectioning method. For samples prepared by any method, the graphene material in the fiber can be detected by the following steps. Firstly,the elemental composition of the microparticle is demonstrated by EDS. Secondly, the morphology of the particles in the fiber can be obtained by TEM, and the number of layers of graphene materials is able to observed directly from the edge of sheet.

Abstract: In the equilibrium processing methods the system Al-C does not show any solid solubility which means that carbon is not soluble in aluminum. In this work an investigation of mechanical alloying on system Al-C was presented to force the dissolution. Using different techniques such as the X-ray diffraction and scanning electron microscopy (SEM), it was proved the force of dissolution by studying the specters for different milling time and by flowing the evolution during annealing into a DSC. Furthermore, morphology of phases has been studied.