Nitridation
Mostrando 1-8 de 8 artigos, teses e dissertações.
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1. Efeito do \ shot peening\ sobre a nitretação de peças de ferro produzidas por metalurgia do pó / The effect of shot peening on the gas nitriding of iron components produced by powder metallurgy
Atualmente, quando se tem a necessidade de nitretar peças produzidas pela metalurgia do pó, usa-se a nitretação a plasma. Apesar de ser um processo de alto custo, com diversas dificuldades operacionais e de ajuste de processo, a nitretação a plasma é o único processo viável para nitretar esses materiais por ter uma ação apenas superficial, não ap
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 02/07/2009
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2. PRODUÇÃO E CARACTERIZAÇÃO DE NANO PARTÍCULAS DO SISTEMA TI-N-O VIA REAÇÃO NA FASE VAPOR / PRODUCTION AND CHARACTERIZATION OF TIN NANO PARTICLES FROM VAPOR PHASE
Nitrides, especially those of transition metals, have received increasing attention in recent years because of their unique chemical and physical properties. Among them, TiN presents many interesting properties, which make it interesting for some potential industrial applications. The importance of nitride titanium (TiN) is due to its properties of high ther
Publicado em: 2008
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3. Isolantes de porta com altas constantes dieletricas (High K) para tecnologia MOS / High K gate insulators for MOS technology
High k insulators for the next generation (sub-32 nm CMOS (complementary metaloxide-semiconductor) technology), such as titanium oxide (TiOx), titanium oxynitride (TiOxNy), titanium-aluminum oxynitride (AlxTiwOyNz), titanium-aluminum nitride (AlxTiwNz) and titanium-aluminum oxide (AlxTiwOy), have been obtained by Ti or Ti/Al e-beam evaporation, with addition
Publicado em: 2008
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4. Kinetic Monte Carlo simulation of the nitridation of the GaAs (100) surfaces
We present, our preliminary results of a systematic theoretical study of the adsorption of N over As-terminated GaAs (100) (2×1) surfaces. We analyzed the changes in the bond-lengths, bond-angles and the energetics involved before and after deposition. Our results show that the N-atoms will prefer the unoccupied sites of the surface, close to the As dimer.
Brazilian Journal of Physics. Publicado em: 2006-06
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5. Oxidation - Nitridation of Ni-Cr-Al alloys
A series of alloys containing 24-36 wt pct Cr and 13.5 - 25.0 wt pct Al was reacted with air at 1100°C for 260 h. The products of isothermal reaction were scales of a-Al2O3 plus small amounts of Cr2O3. These grew according to parabolic kinetics, interrupted by episodic weight losses caused by partial spallation. No nitridation occurred during the isothermal
Materials Research. Publicado em: 2004-03
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6. Corrosion resistance of a steel under an oxidizing atmosphere in a fluid catalytic cracking regenerator
In the present work, the corrosion resistance of an ASTM A 387 G11 steel was evaluated under two conditions: an oxidizing atmosphere in a fluid catalytic cracking regenerator of a petroleum processing unit and a simulated atmosphere in the laboratory, at temperatures of 650 °C and 700 °C. The characterization of the phases present in the oxidized layer was
Materials Research. Publicado em: 2004-03
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7. ENHANCED DIFFUSION AND ELECTRICAL BEHAVIOR OF MISFIT DISLOCATIONS IN EPITAXIAL Si/Si(Ge)
This dissertation addresses enhanced or \"pipe\" diffusion of dopants along localized misfit dislocations (MD) using a \"model\" misfit dislocation structure at epitaxial Si/Si(Ge) interfaces and provides basic information on the merits of applicability of novel bandgap engineered devices. Pipe diffusion is modeled and explored to create pipe-like one dimens
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 1994
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8. Characterization of nitrides formation on NbTi 50% weight alloy by X-ray diffraction. / Caracterização da formação de nitretos na liga NbTi 50% por difração de raios-x.
A nitretação da liga NbTi 50% em peso de Ti, foi examinada em uma atmosfera de nitrogênio, na faixa de temperatura 800-1000°C, utilizando-se a técnica de difratometria de raios-X, microscopia eletrônica de varredura (MEV) e metalografia. Foi observada a formação de duas camadas contínuas de nitretos sobre a matriz: fase-δ (TiN) mais externa e
Publicado em: 1990