Sintering Aid
Mostrando 1-9 de 9 artigos, teses e dissertações.
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1. Ballistic Behavior of New Alumina Composites Reinforced with Niobo-Phosphate Glass
This work aimed to produce and evaluate the ballistic behavior of niobo-phosphate glass-doped alumina composites. The niobo-phosphate glass (30% Nb2O5- 30% P2O5- 20% CaO - 20% CaF2, by mol) were added to the alumina in six different weight percentages. The composite with the highest densification, measured by the Archimedes assay, was used for the ballistic
Mat. Res.. Publicado em: 23/09/2019
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2. Microstructure, Mechanical Properties and in vitro Biological Behavior of Silicon Nitride Ceramics
The bioinert surface of silicon nitride ceramics led us to investigate the additions of SiO2, CaO and Al2O3 in order to aid the liquid phase sintering and improve the mechanical properties and biological behavior of the final materials. The sintered materials reached ca. 97% of theoretical density and total α→β-Si3N4 transformation. The samples had relat
Mat. Res.. Publicado em: 13/09/2018
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3. Identification of Humidity Sensing Mechanism in MgAl2O4 by Impedance Spectroscopy as Function of Relative Humidity
MgAl2O4 is a humidity sensing material, which high melting point requires high sintering temperatures. In this work, manganese oxide was used as a sintering aid to obtain MgAl2O4 samples sintered at 1350°C with a microstructure suitable for humidity sensing. Impedance spectroscopy analyses were performed at several levels of relative humidity, indicating th
Mat. Res.. Publicado em: 21/05/2018
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4. The Effect of Co and Zn Addition on Densification and Electrical Properties of Ceria-Based Nanopowders
Abstract In this work, cobalt and zinc-doped Ce0.8Gd0.2O1.9 samples were prepared starting from a commercial nanopowder and compared to the undoped material. The powder samples were pressed and afterwards sintered by a two-step procedure, before characterization by X-Ray Diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Scanning Electron Microscopy
Mat. Res.. Publicado em: 11/08/2016
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5. The effect of Pr co-doping on the densification and electrical properties of Sr-LaAlO3
Perovskite-type materials have been investigated extensively in the attempt to discover new electrolyte materials for solid oxide fuel cells (SOFC) operating at low temperatures. These materials include LaAlO3-based perovskite, which, when adequately doped, presents high ionic conductivity. However, despite the high conductivity of doped LaAlO3, two characte
Mat. Res.. Publicado em: 07/06/2013
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6. Efeitos da adição do NiO na densificação, na microestrutura e na condutividade elétrica da zircônia totalmente estabilizada com ítría / Effects of NiO addition on the densification, microstructure and electrical conductivity of yttria fully-stabilized zirconia
Os efeitos decorrentes da adição de NiO na densificação, na microestrutura e na condutividade elétrica da zircônia totalmente estabilizada com ítria foram sistematicamente estudados. Zircônia-8% mol de ítria (8YSZ) comercial e acetato, trihidróxi-carbonato, nitrato e óxido de níquel foram utilizados como materiais de partida. Os teores de Ni vari
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/02/2010
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7. Efeitos de aditivos na sinterização do combustivel nuclear UO2.Gd2O3 / Effects of additives on the sintering of UO2.Gd2O3
The addition of 0.5wt% TiO2, Nb2O5, SiO2, Fe2O3 and Al(OH)3 in the UO2·7%Gd2O3 nuclear fuel and the effect on its sintering kinetics under a 99.999% H2 atmosphere were investigated by stepwise isothermal dilatometry. This fuel, used as burnable poison in nuclear power plants, presents a diffusion barrier around 1573 K that impairs densification. The aid of
Publicado em: 2009
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8. Si3N4 ceramics sintered with Y2O3/SiO2 and R2O3(ss)/SiO2: a comparative study of the processing and properties
A comparative study was made of Si3N4 sintered with two types of additives, namely, Y2O3/SiO2 and R2O3(ss)/SiO2, R2O3(ss) being a rare earth metal oxide in solid solution. The processing conditions for both types of Si3N4 were 14 vol% of additives and a sintering temperature of 1800 ºC for 30, 60 and 240 min. To compare the efficiency of the additives in th
Materials Research. Publicado em: 2004-09
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9. ProduÃÃo e estudo da microestrutura e propriedade mecÃnica da cerÃmica Ba2HoZrO5,5 a base de zircÃnia para fabricaÃÃo de cadinhos de alta temperatura
In view of the need of use of crucibles for sintering and crystal growth of advanced ceramics in high temperature furnaces, a study has been realized on a new complex cubic perovskite oxide ceramic Ba2HoZrO5,5 based on zirconium in the Ba-H-Zr-O system. Complex perovskites, which have generally A2BBâO6 or A3B2BâO9 type composition, result by ordering of B
Publicado em: 2003