ChemInform Abstract: Crystal Structure of BaMnB2O5 Containing Structurally Isolated Manganese Oxide Sheets. -
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|ChemInform Abstract: Crystal Structu ...
The title compound is prepared by melting a 2:1:1 molar mixture of MnO, BaO, and B2O3 in a CsCl/RbCl flux (evacuated silica tubes, 1.
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, 2 July 2004, Pages
Compressive creep behavior of hot-pressed Si3N4&CRE2O3&Al2O3 ceramics, , , , , , , , a FAENQUIL-DEMAR, P&lo Urbo-Industrial, Gleba AI-6, s/n, Cep , Lorena, SP, Brazilb CTA-IAE/AMR, CTA-IAE-AMR, P&a Marechal do Ar Eduardo Gomes, 50, S.J. Cep , Campos, SP, BrazilIn this work, yttrium&rare earth oxide solid solution, CRE2O3, produced at FAENQUIL-DEMAR at a cost of only 20% of pure commercial Y2O3, was used as sintering additive of hot-pressed Si3N4 ceramics. The objective of this work was to characterize and to investigate the creep behavior of these ceramics. The samples were sintered by hot-pressing at 1750 &C, for 30 min using a pressure of 20 MPa. Compressive creep tests were carried out in air, between 1250 and 1300 &C, for 60 h, under stresses of 200&300 MPa. The stress exponent under all conditions was determined to be about unity. The apparent activation energy obtained was around 460 kJ mol&1, corresponding to the heat of solution of the Si3N4 in the glassy phase. Both the stress exponent n and apparent activation energy Q are within the range of values reported in other studies of the compressive creep of Y2O3&Al2O3&doped&Si3N4 ceramics. X-ray diffraction (XRD) characterization shows a global reorientation of the β-Si3N4 grains and SEM observations detected no grain growth after the creep tests. These results indicate that grain-boundary sliding controlled by viscous flow is the dominant creep mechanism observed in the present study. The creep resistance presented of this samples indicates that this additive CRE2O3 can be a cheap alternative in the fabrication of Si3N4 ceramics, resulting in promising mechanical properties.KeywordsA. Ceramics; A. Nitrides; D. Mechanical properties
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