Cvd Diamond
Mostrando 1-12 de 38 artigos, teses e dissertações.
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1. Synthesis of Vanadium Interface for HFCVD Diamond Deposition on Steel Surface
Laser cladding of vanadium carbide powder developed an interlayer on AISI D6 steel as a diffusional barrier and to relief thermal residual stress. Laser cladding experiments varied resolution (DPI) and scanning speed (mm/s). CVD diamond deposition on this interface went on by HFCVD technique. The coatings were characterized by X-ray diffraction analysis (XRD
Mat. Res.. Publicado em: 06/07/2017
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2. Diamond Films on Stainless Steel Substrates with an Interlayer Applied by Laser Cladding
The objective of this work is the Hot Filament Chemical Vapor Deposition (HFCVD) of diamond films on stainless steel substrates using a new technique for intermediate barrier forming, made by laser cladding process. In this technique, a powder layer is irradiated by a laser beam to melt the powder layer and the substrate surface layer to create the interlaye
Mat. Res.. Publicado em: 06/03/2017
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3. Influence of Boriding Process in Adhesion of CVD Diamond Films on Tungsten Carbide Substrates
AbstractThis paper shows successful hindering of the negative effects of the cobalt binder in the process of coating WC-Co cutting tools with CVD diamond films. The strategy was creating a boron-rich layer on the surface of the WC-Co substrates as an interlayer to block Co migration. The traditional boriding technique was improved by preheating the salt powd
Mat. Res.. Publicado em: 2015-10
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4. Diamond synthesis by lasers: recent progress
This paper provides an up-to-date critical review of methods for diamond synthesis by lasers. A provisional classification of synthesizing methods is carried out, in order to present a varied and heterogeneous experimental work that is as clear as possible. Laser diamond CVD methods involve chemical processes in a carbon-containing system induced by specific
Química Nova. Publicado em: 2012
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5. Simulação do fluxo reacional de um reator de filamento quente através da simulação direta de Monte Carlo / Simulation of reactive flow of hot filament reactor by direct simulation Monte Carlo
Neste trabalho foi desenvolvido um modelo computacional para simular o ambiente gasoso presente em um reator de filamento quente na obtenção de filmes de diamante através da deposição química à partir da fase gasosa. Foram estudados alguns mecanismos de crescimento aceitos pela comunidade científica e alguns modelos matemáticos de interação das es
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/02/2011
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6. Evaluation of the adhesion strength of diamond films brazed on K-10 type hard metal
The coating of cutting tools with diamond films considerably increases the tool performance due to the combination of the unique tribological properties of diamond with the bulk properties of the substrate (toughness). The tool performance, however, is strongly related to the adhesion strength between the film and the substrate. In this work our main goal wa
Publicado em: 2010
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7. Estudos da deposição de filmes de diamante CVD sobre carbeto de tungstênio, com interface controlada de boreto / Studies of the deposition of diamond CVD films on tungsten carbide, boride with interface control
The objective of this work was to obtain adherent diamond films on WC-Co substrate through the hot filament assisted CVD technique, using a boriding process to form an intermediate layer and avoid the diffusion of the cobalt to the substrate surface. The boriding process consists of a reactive thermo diffusion treatment, in which boron atoms are spread in th
Publicado em: 2009
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8. Estudos da deposição de filmes de diamante CVD sobre carbeto de tungstênio, com interface controlada de boreto / Studies of the deposition of diamond CVD films on tungsten carbide, boride with interface control
O objetivo deste trabalho foi a obtenção de filmes de diamantes aderentes sobre substratos de WC-Co através da técnica CVD assistida por filamento quente, utilizando o processo de boretação para impedir a difusão do cobalto até a superfície do substrato. A técnica da boretação consiste num tratamento termoquímico, no qual átomos de boro são di
Publicado em: 2009
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9. Filmes de diamante nanocristalino infiltrados em substratos de silício poroso através das técnicas CVD/CVI / Nanocrystalline diamond films infiltrates in porous silicon substrate by CVD/CVI Processes
O crescimento de filmes de diamante nanocristalino (NCD - Nanocrystalline Diamond) obtido através da infiltração nos poros do silício poroso (PS - Porous Silicon) foi estudado utilizando microscopia eletrônica de alta resolução, difração de raios-x de alta resolução, espectroscopia de fotoelétrons de raios-x e espectroscopia de espalhamento Raman
Publicado em: 2009
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10. Filmes de diamante nanocristalino infiltrados em substratos de silício poroso através das técnicas CVD/CVI / Nanocrystalline diamond films infiltrates in porous silicon substrate by CVD/CVI Processes
The growth of nanocrystalline diamond films (NCD) on porous silicon (PS) substrate was studied using high resolution scanning electron microscopy, high resolution X-ray diffraction, X-ray photoelectron spectroscopy and Raman scattering spectroscopy. The NCD/PS films resulted in a composite material, with great potential for electrochemical application, mainl
Publicado em: 2009
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11. Histological evaluation of the human pulp response to different cavity instrumentation and restorative techniques / Avaliação histológica da resposta pulpar humana a diferentes técnicas de instrumentação cavitária e de restauração
Este estudo se propõe a analisar a resposta pulpar de dentes humanos a preparos cavitários de classe V, em função de duas diferentes técnicas de instrumentação e de duas diferentes técnicas de restauração. Para tal, cavidades classe V, nas superfícies vestibulares de 48 pré-molares hígidos de pacientes entre 11 e 25 anos, que estavam em tratamen
Publicado em: 2009
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12. Estudo da formação de interface de boreto para a deposição de diamante cvd sobre carboneto de tungstênio / Study of the formation of interface of boreto for deposition of diamond cvd on carbide of tungsten
This work developed a preparation method of an interface for adherent CVD diamond deposition on tungsten carbide sintered with cobalt (WC-Co). This method consists on reactive boron thermodiusion on WC-Co surface. This boronizing process uses a powder mixture of B_4C, KBF_4 , C e SiC, it is performed in a stainless steel crucible, at 1000°C for 5h. The bori
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 15/04/2008