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Debjyoti Ray

Bio: Debjyoti Ray is an academic researcher from University of Calcutta. The author has contributed to research in topics: Dielectric & Ceramic. The author has an hindex of 1, co-authored 4 publications receiving 4 citations.

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TL;DR: In this article, the effect of Y 2 O 3 on the sintering behavior of mullite compacts was investigated and it was shown that rapid mullitization occurred through nucleation and normal grain growth due to the formation of yttrious silicate glassy phase.

4 citations

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TL;DR: In this article, the electrical porcelain insulator was fabricated using local clay raw materials collected from Birbhum, West Bengal, with the objective to evaluate its suitability as a potential raw material.

3 citations

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TL;DR: In this article, the authors used two types of forming techniques to make samples, namely extrusion of plastic mass to get cylinder of desired dimensions and hydraulic compaction to produce rectangular bars, which were properly dried and then heated in an electrically operated furnace in the temperature range of 1170-1260°C.
Abstract: In the present study, total quartz content (30 wt%) of a standard porcelain body was progressively substituted with two different kinds of aluminas (active alumina and calcined alumina) keeping active alumina constant at 5 wt% and varying calcined alumina content to the extent of 5–25 wt%. The alumina incorporated compositions (AP1 to AP7), along with the standard quartz containing porcelain body (SP0), were processed following common ceramic processing techniques. Two types of forming techniques were used to make samples, namely extrusion of plastic mass to get cylinder of desired dimensions and the other one was hydraulic compaction to produce rectangular bars. The extruded and compacted samples were properly dried and then heated in an electrically operated furnace in the temperature range of 1170–1260 °C. The fully densified samples heated at 1260 °C were subjected to various tests, namely phase identification by X-ray diffraction (XRD) pattern studies; scanning electron microscopic (SEM) analysis; and measurement for electrical properties such as dielectric strength (kV/mm), dielectric loss (tanδ), electrical resistivity (ohm-cm), and dielectric constant to confirm suitability of the samples for application in high-tension power transmission system. The results revealed that the body AP6, wherein 25 wt% quartz was substituted by 5 wt% active alumina and 20 wt% calcined alumina and heated at 1260 °C, may be considered the most suitable sample for porcelain insulator.

2 citations

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TL;DR: In this article, a comprehensive thermal dehydration-rehydration behavior of the naturally occurring bauxite rock of India in powder form in relation to variation of temperature of thermal treatment and relative humidity of the environment is presented.
Abstract: Dehydration-rehydration study of bauxite rock carries a great practical significance in preparing different alumina products, predicting the structure-property relationship of the high alumina bearing ore for its effective utilization and controlling the drying-firing schedule of bauxite based various alumina ceramics. This paper presents a comprehensive thermal dehydration-rehydration behaviour of the naturally occurring bauxite rock of India in powder form in relation to variation of temperature of thermal treatment and relative humidity of the environment.

1 citations


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TL;DR: In this paper , the mesoporous silica nanoparticles (MSNs) were synthesized from waste using a chemical synthesis route, which offers the possibility to control silica structure, phase, morphology, and sizes by fine tuning the reaction parameters/conditions.
Abstract: In recent years, the amount of agricultural and industrial wastes being generated is increasing rapidly. This leads to numerous disposals, governance, and environmental issues. Therefore, the re-utilisation of these wastes into value-added products such as mesoporous silica nanoparticles (MSNs) has attracted great attention. MSNs have garnered immense attention in various applications owing to their tuneable pore dimensions, high surface areas, and tailorable structure, suitable for different post-functionalisation. In this review, recent progress on the synthesis of MSNs from waste using a chemical synthesis route is presented. This route offers the possibility to control silica structure, phase, morphology, and sizes by fine tuning the reaction parameters/conditions. The characteristics and applications of the MSNs produced are also analysed to examine the potential of using agricultural and industrial waste as the silica precursor. Although the use of inexpensive waste-derived materials seems promising for both waste reduction and value-added products synthesis, further research is still needed to boost the production of silica especially at a larger scale.

22 citations

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TL;DR: In this paper, the microstructural evolution and densification behavior of porous kaolin-based mullite ceramic added with MoO3 were investigated, which not only lowered the secondary mullitization temperature to below 950°C, but also facilitated the anisotropic growth of mullite grains.

21 citations

Journal ArticleDOI
Jiancheng An1, Tiezhu Ge1, Enxia Xu1, Fei Zhao1, Xinhong Liu1 
TL;DR: In this article, the phase composition, microstructure and properties of samples with various Si addition calcined at 1500°C under reducing atmosphere were investigated, and the results indicated that the mullite-SiC-O′-SiAlON composites were obtained at 1500-°C in carbon embedded condition by firing Si and bauxite-based mullite mixtures.

13 citations

Journal ArticleDOI
TL;DR: In this paper , the porosity, density, and bending strength of porcelain insulators were calculated and a correlation was developed between mechanical strength of the insulator and various physio-chemical and microstructural properties.

6 citations

Journal ArticleDOI
TL;DR: In this paper, the porosity, density, and bending strength of porcelain insulators were calculated and a correlation was developed between mechanical strength of the insulator and various physio-chemical and microstructural properties.

6 citations