Sintering Additives
Mostrando 1-12 de 23 artigos, teses e dissertações.
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1. Sintering mechanisms of partially stabilized zirconia (TZ3Y) with ZnO and Co3O4 as sintering additives
Abstract In this work, the sintering mechanisms of 3 mol% yttria-stabilized zirconia (TZ3Y) and TZ3Y containing 0.3 wt% of ZnO or Co3O4 were analyzed by determining the apparent activation energy of sintering from dilatometry data and observing the evolution of microstructure. Dilatometry test was performed at a heating rate ranging from 5 to 20 °C/min from
Cerâmica. Publicado em: 2021-06
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2. Effect of sawdust as porosity agent on final properties of geopolymers
Abstract The geopolymers synthesis are based on geopolymerization, a sequence of reactions processed in an alkaline medium through oligomers providing a three-dimensional molecular structure. In this work, the polycondensation of metakaolin was performed with alkaline activators (NaOH and sodium silicate), wood sawdust and other additives. Two different comp
Cerâmica. Publicado em: 2019-01
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3. Influence of additives on phase stabilization of scandia-doped zirconia
ABSTRACT The effects of small additions of tin, zinc, calcium and boron oxides on phase composition and electrical conductivity of zirconia-10 mol% scandia were investigated. Compounds containing 1 mol% zinc, tin and calcium oxides and 1, 3 and 5 wt.% boron oxide were prepared by solid state reaction and characterized by X-ray diffraction, density measuremen
Matéria (Rio J.). Publicado em: 01/06/2017
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4. Microstructural Characterization and Influence of Ceramography Method on the Microhardness of Sintering Agents Added Silicon Carbide
This study carried out the microstructural characterization, by light microscopy, of sintered SiC in the presence of liquid phase at temperatures of 1800, 1850 and 1900 ºC, added with Al2O3 and Y2O3 as well with Al2O3-YAG composite in the proportions of 5, 10 and 15% by weight. It was possible to observe the formation of microstructural patterns resulting f
Mat. Res.. Publicado em: 15/05/2017
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5. The Effect of Cr3C2 and TaC Additives on Microstructure, Hardness and Fracture Toughness of WC-6Co Tool Material Fabricated by Spark Plasma Sintering
Spark plasma sintering has been used to successfully produce WC-6Co-xCr3C2, WC-6Co-xTaC (x = 0.2, 0.6, 1.0) and WC-6Co-xCr3C2-xTaC (x = 0.1, 0.3, 0.5) cemented carbides. The spark plasma sintered compacts were investigated by scanning electron microscopy, hardness tests and fracture toughness tests. The results were compared to an additives-free WC-6Co cemen
Mat. Res.. Publicado em: 11/05/2017
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6. Properties of SiC Ceramics Sintered via Liquid Phase Using Al2O3 + Y2O3, Al2O3 + Yb2O3 and Al2O3 + Dy2O3 as Additives: a Comparative Study
Silicon carbide (SiC) ceramics show excellent performance at high temperatures. Due to the high covalence of Si-C bonds, these ceramics are produced successfully only via liquid phase sintering (LPS). In this work, SiC ceramics were sintered via LPS using eutectic mixtures of Al2O3+Y2O3, which served as a standard for comparison, Al2O3+Yb2O3 and Al2O3+Dy2O3.
Mat. Res.. Publicado em: 2015-06
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7. Evaluation of the Influence of MgO and La2O3 on the Fast Sintering of Mullite
The influence of MgO and La2O3 on the fast sintering of mullite was evaluated in this work. High-purity mullite was doped with MgO and La2O3, conventionally sintered, fast sintered, and microwave-sintered in rapid sintering cycles. The results showed that MgO and La2O3 strongly affected the densification of fast sintered samples; and only doped bodies reache
Mat. Res.. Publicado em: 2015-02
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8. Development of self-lubricating composite materials of nickel with molybdenum disulfide, graphite and hexagonal boron nitride processed by powder metallurgy: preliminary study
The purpose of this work was to develop nickel self-lubricating composites using solid lubricant as second phase and obtained by powder metallurgy. The work involved the study of chemical stability and chemical interaction between the nickel alloy matrix and solid lubricating additives (molybdenum disulfide, graphite and hexagonal boron nitride). The results
Mat. Res.. Publicado em: 08/11/2013
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9. Influência do cálcio e do lítio na sinterização e na condutividade elétrica do óxido de cério contendo gadolínio / Influence of calcium and lithium on the densification and electrical conductivity of gadolini-doped ceria
A introdução de cálcio e lítio como aditivos de sinterização na céria: 10% mol gadolínia foi investigada com o intuito de verificar sua influência na densificação e condutividade elétrica das cerâmicas sinterizadas. Pós contendo de 0 a 1,5% mol do metal foram preparados tanto por reação em estado sólido quanto pela co-precipitação dos oxal
Publicado em: 2011
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10. Decision support method to apply Additive Manufacturing Technologies for plastic components in the aircraft industry
Additive Manufacturing Technologies (AMT) are a collection of manufacturing processes driven by CAD data to produce physical models and parts by means of additive techniques. They are based on a layer-by-layer material consolidation process instead of the traditional methods. Due to machine and material developments, such processes may be used to produce fin
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 10/11/2009
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11. Influence of additive system (Al2O3-RE2O3 , RE = Y, La, Nd, Dy, Yb) on microstructure and mechanical properties of silicon nitride-based ceramics
Silicon nitride based ceramics have been widely used as structural ceramics, due mainly to their thermo-mechanical properties such as high density, high thermal shock resistance, corrosion resistance and chemical stability. The aim of this study was to determine the influence of rare earth and aluminum oxide additions as sintering aids on densification, micr
Materials Research. Publicado em: 2009-06
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12. 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