Diamond Tool
Mostrando 1-12 de 24 artigos, teses e dissertações.
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1. Micro-Scale Abrasive Wear Testing of CrN Duplex PVD Coating on Pre-Nitrided Tool Steel
Specific wear rates were calculated from a series of micro-scale abrasive tests by means of the calotte-grinding method. The tested material was a CrN coating deposited by arc evaporation on ion-nitrided AISI H13 steel. Characterizations included: phase analysis, chemical composition, metallography, microhardness, micro-scratch resistance and nano-indentatio
Mat. Res.. Publicado em: 22/06/2017
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2. Study of the TiC Coating on Powder Metallurgy Diamonds Tool's Performance
Some diamond tools use iron in their composition, and it is known that iron is a strong catalyst for the graphitization of diamonds. This graphitization occurs mainly during the processing of composite materials - conventional sintering or hot pressing, and during cutting operations. This work studies the effect of TiC coating on diamond, on structure, micro
Mat. Res.. Publicado em: 2015-06
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3. Analysis of surface roughness and hardness in titanium alloy machining with polycrystalline diamond tool under different lubricating modes
The present work deals with the investigation on machining of difficult-to-machine material titanium alloy (Ti-6Al-4V) using poly crystalline diamond (PCD) tool under different coolant strategies, namely dry, flooded and MQL. Taguchi technique has been employed and the optimization results indicated that MQL lubricating mode with cutting speed of 150 m/min,
Mat. Res.. Publicado em: 15/08/2014
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4. Influence of graphite particles on surface roughness and chip formation studies in turning metal matrix composites
This study presents an experimental investigation on surface roughness and chip formation in turning of Al 2219/15SiCp and Al 2219/15SiCp-3Gr (hybrid) composites. Experiments were conducted with different cutting conditions using carbide, coated carbide and polycrystalline diamond (PCD) tools. The results reveal that the surface roughness values are less for
Mat. Res.. Publicado em: 25/06/2013
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5. Avaliação da customização por desgaste de pinos pré-fabricados de fibra de vidro / Evaluation of fibre posts submitted to customization of the apical portion
The purpose of this study was to evaluate fibre posts (White Post DC/FGM) submitted to customization of the apical portion. Experiment 1: 5 #4 posts were divided into five groups (G) and submitted to different custom adaptation treatments: GA no surface treatment, GB- industrial shaping tool (Dentsply), GC- #3195 fine diamond bur (KG Sorensen), GD- medium-gr
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/01/2012
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6. Degradação eletroquímica da vinhaça usando eletrodo de diamante dopado com boro
The degradation of vinasses in aqueous solution from ethanol industry has been investigated by electrochemical oxidation using a boron doped diamond electrode (BDD). Samples of vinasses were electrolyzed in medium of (0.1 mol L-1) Na2SO4 solutions at controlled potentials of +2.4, +3.0 and +4.0 V (vs. Ag/AgCl) and exhibited considerable reduction of total or
Química Nova. Publicado em: 2011-09
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7. 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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8. Study of the discrepancy between the areas of the initial apical instrument and of the apical foramen in the maxillary incisors / Estudo da discrepância entre as áreas do instrumento apical inicial e do forame apical nos incisivos centrais superiores
The aim of this study was to study the discrepancy between the areas of initial apical instrument (IAI) and major foramen of central maxillary incisives by scanning electronic microscopy. Fifty teeth received cervical preparation with LA Axxess drills. K-files were then introduced in root canal, in gradual increase of diameter, until tactile adjustment one m
Publicado em: 2010
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9. Moldagem por injeção de microcomponentes ópticos poliméricos gerados em insertos usinados por torneamento de ultraprecisão / Injection molding of polymer micro-optical components generated in inserts by ultra-precision turning
Este trabalho analisou o processo de moldagem por injeção de micro elementos ópticos difrativos usinados em insertos de cobre eletrolítico com ferramenta de diamante com ponta única. Quatro tipos de microestruturas características foram selecionados neste estudo, a saber: lente anesférica, lente de Fresnel, grade de difração (blaze grating) e sensor
Publicado em: 2010
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10. Eletrodos de diamante dopado com boro como ferramenta de detecção na interface biodiesel/eletrólito de suporte / Boron-doped diamond electrodes as an interesting detection tool to be used in the biodiesel/support electrolyte interface
This work describes the utilization of a boron-doped diamond electrode (BDD) in conjunction of the Square Wave Voltammetry (SWV) technique, aiming to realize the detection of some organic molecules (Pararosaniline chloride, Dextromethorphan e Benzene) e in aqueous media and in the biodiesel/support electrolyte interface. Different biodiesel samples were synt
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 17/09/2009
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11. Single point diamond turning of the tungsten carbide / Usinabilidade do carbeto de tungstênio no torneamento com ferramenta de diamante
The single point diamond turning of the Tungsten Carbide is presented. The motivation for this study is the material´s high hardness and potential application for micromolds. A Tungsten Carbide sample was subjected to tests for determination of cutting parameters to achieve the ductile regime of material removal. Based on experimental results it was conclud
Publicado em: 2009
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12. IMPLEMENTAÇÃO DA TÉCNICA DE FOTOACÚSTICA DE CÉLULA ABERTA PARA OBTENÇÃO DA DIFUSIVIDADE TÉRMICA DE METAIS
The photo-acoustic technique has become a standard photo-thermal method for carrying out diverse studies on solids materials. Photo-thermal phenomena in solids results from a combination of thermal expansion, thermal diffusion, and thermo-elastic bending effects and can be obtained by c k . r a = where k is the thermal conductivity, r is the density, and c i
Publicado em: 2009