Sintering
Mostrando 25-36 de 346 artigos, teses e dissertações.
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25. β-Tricalcium phosphate shaped by replica method
Resumo Biomateriais, como o fosfato tricálcico, podem apresentar diferentes taxas de reabsorção no organismo que dependem das suas propriedades físico-químicas sendo que a condição superficial, tais como morfologia, tamanho de partículas e porosidade, é de fundamental importância. Assim, neste trabalho, estudou-se o recobrimento da matriz Luffa cyl
Cerâmica. Publicado em: 14/11/2019
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26. Firing Behavior of the Clay Fraction of a Natural Kaolinitic Clay: Are They Different?
A comparative investigation on the firing behavior of a natural kaolinitic clay from Campos dos Goytacazes, Brazil, and its specific clay fraction was performed. The clay fraction, equivalent diameter less than 2 µm, was separated from the precursor clay by a sedimentation method. Chemical analysis, X-ray diffraction (XRD) and scanning electron microscopy w
Mat. Res.. Publicado em: 21/10/2019
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27. Additive manufacturing of titanium alloy could modify the pathogenic microbial profile: an in vitro study
Abstract Additive manufacturing (AM) is an emerging process for biomaterials and medical devices. Direct Laser Metal Sintering (DLMS) is an AM technique used to fabricate Ti–6Al–4V implant materials with enhanced surface-related properties compared with wrought samples; thus, this technique could influence microbial adsorption and colonization. Therefore
Braz. oral res.. Publicado em: 30/09/2019
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28. Influência do método de limpeza da zircônia na adesão da prótese após a contaminação com saliva
Resumo Introdução A contaminação das restaurações de zircônia com saliva antes da cimentação influencia na resistência da adesão face à afinidade com os íons da saliva. Objetivo Analisar os métodos de limpeza da zircônia na adesão à dentina após a contaminação com saliva. Material e método Oitenta amostras de zircônia com dimensão 4
Rev. odontol. UNESP. Publicado em: 26/09/2019
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29. 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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30. Influence of Sintering Time on the PTCR Effect of Nb2O5-doped BaTiO3 Ceramics
The effects of the sintering time on the electrical properties and the positive temperature coefficient of resistance (PTCR) effect of Ba1.006(Ti1-xNbx)O3 (BTN) ceramics were investigated, which were sintered at 1190 ºC for 0.5-6 hours in a reducing atmosphere and then re-oxidized at 800 ºC for 1 hour. The results indicated that the sintering time affected
Mat. Res.. Publicado em: 16/09/2019
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31. Characterization of Ti-35Nb alloy surface modified by controlled chemical oxidation for surgical implant applications
ABSTRACT Titanium-Niobium alloys have been studied for biomedical applications due to their satisfactory biocompatibility. In order to improve the long-term implantation, surface modification techniques have been developed to generate suitable topography, roughness, chemical composition, surface energy, etc. Considering this approach, the present work aimed
Matéria (Rio J.). Publicado em: 16/09/2019
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32. Caracterização do composto de CuCr2O4 obtido pelo método da reação de combustão em solução
RESUMO O material CuCr2O4 foi sintetizado pela reação de combustão em solução e tratado termicamente na faixa de 600 à 1100oC, afim de verificar a evolução das fases. O composto foi carcterizado estrutural e morfologicamente por meio das técnicas de Difração de Raios X (DRX), refinamentos pelo método de Rietveld, Microscopia Eletrônica de Varred
Matéria (Rio J.). Publicado em: 16/09/2019
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33. Evaluation of a Metal-Organic Composite (Tungsten-Lignin) for Attenuation of Gamma Radiation
The objective of this work was to use tungsten and lignin as precursors to obtain a metal-organic composite tungsten-lignin (W-Lig) using different sintering temperatures. Tungsten is a refractory metal and it was selected for the composite since it is widely used for high-energy radiation shielding as it has an excellent absorption cross section for thermal
Mat. Res.. Publicado em: 02/09/2019
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34. Comparison of Aluminum Based Alloys Reinforced with Intermetallic Developed by Powder Metallurgy and Arc Melting Routes
Abstract In this work, Al-Ti alloys were prepared using metallic powders of Al and Ti via Powder Metallurgy (PM) and Arc Melting (AM) route. Four chemical compositions including pure aluminum were studied. Metallic powders were mixed with three compositions, Al-5Ti, Al-10Ti and Al-10Ti-2SiC. All the compositions were in atomic percentage. In case of PM, samp
Soldag. insp.. Publicado em: 29/08/2019
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35. New Strategies in Enantioselective Hydrogenation on Supported Transition Metal Catalyst: Effects of Metal Sintering and Support Swelling
The effect of noble metal catalysts supported on an ionic exchange resin for the enantioselective hydrogenation of ethyl pyruvate to ethyl lactate was studied. High activity and moderate enantioselectivity levels were obtained. Pt was the best enantioselective metallic phase, followed by Pd and Au; Rh was the less enantioselective metallic phase. The effect
J. Braz. Chem. Soc.. Publicado em: 12/08/2019
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36. Development of hollow fiber membranes with alumina and waste of quartzite
The development of ceramic membranes with different geometries and compositions extends the possibilities of industrial applications, inducing advantages in terms of increased permeability, membrane area by volume module and chemical, thermal and mechanical resistance. The use of low-cost raw materials is a trend that has grown in scientific research. The ai
Mat. Res.. Publicado em: 12/08/2019