Carbon Nitrides
Mostrando 1-9 de 9 artigos, teses e dissertações.
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1. An Overview of the Photocatalytic H2 Evolution by Semiconductor-Based Materials for Nonspecialists
The solar-to-chemical energy conversion is promising to tackle sustainability challenges toward a global future. The production of H2 from sunlight represents an attractive alternative to the use of carboniferous fossil fuels to meet our energy demands. In this context, the water splitting reaction photocatalyzed by semiconductors that can be excited under v
J. Braz. Chem. Soc.. Publicado em: 2020-02
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2. Corrosion Behavior of Plasma Nitrided and Nitrocarburised Supermartensitic Stainless Steel
Supermartensitic stainles steels (SMSS's) are a new generation of martensitic steels that have been increasingly used in oil and gas applications due to their adequate corrosion resistance and mechanical properties. In the present study, SMSS specimens (UNS S41425) were solution heat treated and air cooled followed by plasma nitriding and nitrocarburising at
Mat. Res.. Publicado em: 12/03/2018
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3. Influence of heat treatments on the microstructure and degree of sensitization of base metal and weld of AISI 430 stainless steel
ABSTRACT AISI 430 is a non-stabilized ferritic stainless steel grade with carbon content lower than 0.12%.After hot and cold rolling this material is annealed. The slow cooling after soaking at temperatures between 900oC and 1000oC promotes the formation of a high quantity of carbides and nitrides, while the rapid cooling partially suppresses the formation o
Matéria (Rio J.). Publicado em: 08/01/2018
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4. Pulsed dc discharge in the presence of active screen for nitriding of high carbon steel
A discharge of nitrogen - hydrogen mixture by 50 Hz pulsed dc in the presence of active screen cage is investigated by optical emission spectroscopy (OES). The aim is to identify the parameters (mixture ratio, filling pressure and current density) that may lead to high concentration of active species (N2, N2+ and N). The maximum concentration in this experim
Mat. Res.. Publicado em: 22/07/2014
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5. Efeito do carbono no processo de nitrocarburização com plasma pulsado da liga metalica AISI H13 / Carbon effect on pulsed plasma nitrocarburizing process in AISI H13 tool steel
This work presents a study on the effect of the incorporation of carbon and nitrogen on he formation of a singlephase homogeneous layer, composed by e -Fe2-3(C,N) carbonitrides, on the top surface of a AISI H13 tool steel. We also present studies on the effect of the incorporation of these elements (C and N) in the microstructure and in the mechanical and ch
Publicado em: 2007
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6. Surface treatments of a iron aloy by nitrogen ions / Tratamentos de superficies de uma liga ferrosa por ions de nitrogenio
The objective of this project is to study processes of plasma surface treatment with special emphasis to the differences these techniques might show in relation to others, looking forward to understand the process from surface phenomena. Two kinds of surface treatment have been studied, including three different techniques: ion beam nitriding, pulsed plasma
Publicado em: 2006
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7. Ressonancia paramagnetica do spin eletronico em nitretos de carbono amorfo / Electron spin resonance on amorphous carbon nitrides
Neste projeto de tese de mestrado apresentamos os resultados de medidas de ressonância paramagnética eletrônica (RPE), realizadas em filmes de nitreto de carbono amorfo (a-C1-xNx(:H)), depositados por duas técnicas diferentes, conhecidas como: Glow Discharge (GD) e Dual Ion Beam Assisted Deposition (DIBAD). Os principais parâmetros obtidos como: A conce
Publicado em: 2005
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8. Microstructure and mechanical properties of a microalloyed steel after thermal treatments
The properties of a microalloyed steel, with Nb and V in its composition, were studied, after different intercritical thermal treatments and at different austenitizing and tempering temperatures. The mechanical properties of the specimens were measured in a Vickers hardness tester, and their microstructures were analyzed by optical microscopy, with the aid o
Materials Research. Publicado em: 2003-06
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9. Efeitos da adição de niobio na estrutura e propriedades dos aços com medio e alto teor de carbono
Medium and high carbon steels containing microalloying additions of niobium have, in recent years, been used for the manufacture of forged components in the automotive industry, rails and high strength concrete reinforcing bars. However, optimization of the strength and toughness properties of these materials has largely been empirical. The present work was
Publicado em: 1983