To improve the corrosion resistance of the ceramic layer prepared by micro-arc oxidation (MAO) on magnesium alloy, a hydrophobic Mg-Al-Co layered double hydroxide (LDH) coating was fabricated on MAO coated AZ31 magnesium (Mg) alloy by using a simple in-situ growth method. The results showed that the LDH film covered the MAO coating tightly, and it sealed the micro-pores and cracks in the MAO coating

The effects of gamma irradiation in the dose rate of 25 kGy on the structural and optical properties of ZrO2 doped sodium borate glasses were studied. Glassy nature confirmed by XRD and all the physical parameters were calculated. IR spectra revealed the characteristic vibrational and stretching bands due to trigonal and tetrahedral borate network. Slight changes were caused by gamma irradiation in

The influence of calcium bentonite addition on the compressive strength, efflorescence extent and drying shrinkage of fly-ash based geopolymer mortar was investigated. The results showed that appropriate amount (e.g. 15 wt%) of calcium bentonite addition favoured the enhancement of compressive strength mainly because its addition allowed the geopolymer to tolerate more water glass addition and therefore

Suitable sintering ability and excellent densification are important factors for forsterite (Mg2SiO4) ceramics and refractories when used in glass furnaces, continuous casting tundishes, non-ferrous metal smelters, etc. Here, a dense and fine-grained structure has been obtained in the forsterite ceramics prepared by two-step sintering process. Results show that combination of grinding and second step

The work presented in this article deals with the synthesis of a cordierite ceramics, using a natural Algerian kaolin named DD3 of black colour, located in the region of Djbel Dbagh in Guelma. A synthesis was also carried out on bleached DD3 kaolin obtained by activation of hydrochloric acid on natural kaolin in order to eliminate the manganese oxide (which is responsible for the blackish colour) while

The aim of this investigation is to study the UV/Visible absorption and infra-red transmission characteristics due to Cu+/Cu2+ redox in silica glass. The glass composition 18Na2O-2MgO-8CaO-72SiO2 (mol%) containing different concentrations of CuO were prepared by melting route. The optical absorption spectra of the glasses were recorded on an UV/Visible/NIR spectrophotometer in the wavelength range

XRD results show that diffraction peak of M3B is gradually apparent with the increase of annealing temperature and time, which indicates that annealing can promote the formation of M3B phase. The increase of annealing temperature and time leads to transformation of inter dendritic microstructure from long strip Cr3B phase to granular Cr3B phase. Particularly, after annealing at 1100oC for 20 h, the

Based on the attribute of asbestos tailings rich in silicon and magnesium, the powder of asbestos tailings was pre-calcined followed by MgO addition in the green body and finally sintered to develop refractory ceramics containing phases of forsterite, magnesioferrite and merwinite. The effects of pre-calcining treatment, MgO content and sintering temperature on crystallization, phase transition, microstructure

Eu3+ doped M3La2Si3O12 (M = Mg2+, Ca2+, Sr2+, Ba2+) materials were prepared using sol-gel technique. The samples were prepared at a temperature of 950oC using 0.01-0.05 mole of Eu3+ ion to examine worth of amount of activator ion on luminous intensity. Photoluminescence characteristics of these Eu3+ incorporated inorganic fluorescent materials were explored using photoluminescence (PL) emission spectroscopy

High voltage bushing is one of the key components of Indian Test Facility. It is designed to provide 100 kV electrical isolation to all high voltage feedlines from the electrically grounded vessel. It also forms vacuum boundary between the vessel and the outer atmosphere. Conventional vacuum compatible porcelain insulator is selected for this purpose. However, to accommodate several high voltage feedlines

Indian natural magnesite containing silica and lime as main impurities was beneficiated using reverse froth flotation technique. Pine oil was used as frother, Flotigam EDA as collector and sodium hexametaphosphate as depressant of carbonate group. Operating parameters were optimized using response surface methodology and a quadratic model equation was formulated for the experiment. The effect of different

High strength ceramic proppants are a significant factor during the hydraulic fracturing process. Although many system ceramic proppants have been developed, their strength remained relatively low. In this work high strength ceramic proppants have been successfully prepared by solid state sintering at 1450°C using low grade bauxite and varying contents of feldspar; XRD analysis revealed that the prepared

The present work reports a convenient way to evaluate the photocatalytic activity of anatase TiO2 films by monitoring the degradation of methylene blue (MB) directly on the TiO2 coated tiles under simulated solar light (1 sun condition; AM 1.5G simulator) using Raman spectroscopy. For this purpose, nanocrystalline TiO2 films of aesthetic quality (thickness ∼80±5 nm) were deposited by the sol-gel method

The present work is focused on the development and characterization of low-cost flat microfiltration ceramic membranes from West Cameroonian kaolin, cassava starch and bovine bone ash as pore-forming agents, and comparative study of porogens’ influence on membranes properties. These materials were chosen due to their abundance in the country and their beneficial properties. The proportion of porogens