Author
Jagdish Prasad
Bio: Jagdish Prasad is an academic researcher. The author has contributed to research in topics: Sintering & Shrinkage. The author has an hindex of 2, co-authored 3 publications receiving 5 citations.
Papers
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TL;DR: In this article, the sintering of Al2O3 in the presence of (CaO+FeO3) and CaO was investigated at various temperatures (1300°-1600°C) and times (up to 300 minutes).
Abstract: Investigations were carried out on sintering of Al2O3 in presence of (CaO+Fe2O3) and CaO.Fe2O3 synthesized at 1150°c for 50 minutes Effects of different amounts, viz. 0.001, 0.003, 0.005 and 0.01 moles of (CaO+Fe2O3) and CaO.Fe2O3 per 100 gm of Al2O3 on the sintering of alumina were studied at various temperatures (1300°—1600°C) and times (up to 300 minutes). The study revealed that 0.005 moles of (Ca0+Fe2O3) and CaO.Fe2O3 gave maximum densification of alumina at 1600°c.
2 citations
TL;DR: In this paper, the sintering behavior of various AI2O3-Cr2O 3 compacts made out of calcined alumina fine and chromic oxide, upto a temperature of 1700°C and 4 h soaking time was investigated.
Abstract: Sintering behaviour of various AI2O3-Cr2O3 compacts made out of calcined alumina fines and chromic oxide, upto a temperature of 1700°C and 4 h soaking time was investigated. The amount of chromic oxide was found to have an appreciable impact on densification, rate constants, activation energy, diametrical tensile strengths and microstructures. A maximum density of 3.452 g.cm−3 and a maximum shrinkage of 15.67% were attained with the compacts having 2 wt% Cr2O3 when sintered at 1700°C for 4 h. It has been found that with the increase in Cr2O3 content, the porosity of the compact increases.
2 citations
TL;DR: In this paper, densification behavior and sintering kinetics of different MgO-Al2O3-Cr 2O3 compacts have been studied and a maximum density of 3.21 g.cm−3 was obtained at 1650°C with soaking for 4 hours.
Abstract: In the present investigation, densification behaviour and sintering kinetics of different MgO-Al2O3-Cr2O3 compacts have been studied. A maximum density of 3.21 g.cm−3 was obtained at 1650°C with soaking for 4 hours. The value of corresponding linear shrinkage was 12.26%. Diametrical tensile strengths and activation energy of different compacts were determined. Identification of phases using powder X-ray diffraction patterns and microstructural studies using thin section and scanning electron microscope have also been carried out. Microstructure showed rounded and polygonal grains of closely spaced spinel.
1 citations
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TL;DR: In this article, the authors demonstrate that seeding nanocrystalline transition alumina powders is a viable option for producing high quality, alumina-based ceramics, using α-Al 2 O 3 concentrations of ⩾1.25 wt.
Abstract: This paper demonstrates that seeding nanocrystalline transition alumina powders is a viable option for producing high quality, alumina-based ceramics. By using α-Al 2 O 3 concentrations of ⩾1.25 wt.% α-Al 2 O 3 seed particles (equivalent to 5 ×10 14 seeds/cm 3 of γ-Al 2 O 3 ) the sintering temperature is reduced from 1600°C for unseeded γ-Al 2 O 3 to 1300–1400°C in dry pressed powders. The scale of the sintered microstructure is related to N v −1/3 and thus a 100-nm grain size is obtained. It is apparent that seeding is necessary for producing dense, alumina-based ceramics from nanocrystalline transition alumina powders.
86 citations
TL;DR: In this paper, a facile route was introduced to fabricate the Al2O3-CaO-Cr 2O3 refractory castables to mitigate Cr(VI) using basic silica sol (pH∼9) via in-situ secondary phase modification.
19 citations
TL;DR: In this article, a polycrystalline ternary Cr(III) compound (CaAl2Cr2O7) was synthesized at 1500°C under air atmosphere for the first time.
19 citations
01 Jan 2002
TL;DR: In this paper, the authors demonstrate that seeding nanocrystalline transition alumina powders is a viable option for producing high quality, alumina-based ceramics, using a-Al2O3 concentrations of 51.25 wt.% seed particles (equivalent to 5 � 10 14 seeds/cm 3 of g-Al 2O3).
Abstract: This paper demonstrates that seeding nanocrystalline transition alumina powders is a viable option for producing high quality, alumina-based ceramics. By using a-Al2O3 concentrations of 51.25 wt.% a-Al2O3 seed particles (equivalent to 5 � 10 14 seeds/cm 3 of g-Al2O3) the sintering temperature is reduced from 1600 � C for unseeded g-Al2O3 to 1300–1400 � C in dry pressed powders. The scale of the sintered microstructure is related to Nv 1/3 and thus a 100-nm grain size is obtained. It is apparent that seeding is necessary for producing dense, alumina-based ceramics from nanocrystalline transition alumina powders. # 2002 Elsevier Science Ltd. All rights reserved.
3 citations