Abrasive Wear
Mostrando 13-24 de 84 artigos, teses e dissertações.
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13. Desempeño de discos segmentados de diamante en el corte de hormigón
ABSTRACT Segmented diamond discs are used in cutting abrasive and fragile materials, such as masonry, concrete and marble. Their constant evolution over the past 15 years has allowed increasing the effectiveness of these operations. However, despite being widely used, there is still no standard test to assess their performance in representative conditions of
Matéria (Rio J.). Publicado em: 19/07/2018
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14. Study of Mechanical and Wear Behaviour of Hyper-Eutectic Al-Si Automotive Alloy Through Fe, Ni and Cr Addition
Effect of Fe, Ni and Cr addition on the wear behavior of hyper-eutectic Al-Si automotive alloy has been studied. Dry sliding wear tests have been conducted using pin-on-disc wear testing machine under normal loads of 20N and constant sliding speed of 0.64 ms-1. Influence of Fe addition to the base alloy increases the wear rate due to the formation of needle
Mat. Res.. Publicado em: 11/06/2018
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15. Microstructure and Properties of Cu-ZrO2 Nanocomposites Synthesized by in Situ Processing
In situ chemical reaction method was used to synthesize Cu-ZrO2 nanocomposite powders. The process was carried out by addition of NH4(OH) to certain amount of dispersed Cu(NO3)2·3H2O and ZrOCl2·8H2O solution. Afterwards, a thermal treatment at 650 °C for 1 h was conducted to get the powders of CuO and ZrO2 and remove the remaining liquid. The CuO was then
Mat. Res.. Publicado em: 23/10/2017
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16. 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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17. Análisis de falla de los bujes del tornillo de una extrusora utilizada para procesar pintura en polvo
ABSTRACT This article aims to present the failure analysis of extruder screw bushings used for the manufacture of powder paint. Two bushings, one from the transition zone and one from the metering zone were selected to carry out the study. Chemical composition and microstructural analysis, hardness testing and a detailed analysis of the failed surfaces by vi
Matéria (Rio J.). Publicado em: 22/06/2017
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18. Influence of Niobium and Molybdenum on Mechanical Strength and Wear Resistance of Microalloyed Steels
The HSLA (High-Strength Low Alloy) steels are used in the production of pipes, flanges and connectors to build ducts for ore, oil and gas transport. The conventional processes are the rolling or forging. In the transport of ore and heavy oil, the abrasive particles impair the surfaces and reduce the pipelines lifetime. Therefore, besides the mechanical prope
Mat. Res.. Publicado em: 05/06/2017
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19. Abrasive Wear Behaviour of Surface Modified Jute Fiber Reinforced Epoxy Composites
The present article depicts the specific wear rate of jute fiber reinforced epoxy composites with different weight percentage of fiber loading (10, 20, 30, 40 wt. %) and different chemical treatments (Alkaline and Benzoyl chloride treatment). The three-body abrasive wear analysis was studied according to ASTM-G65 using a rubber wheel abrasion apparatus (dry
Mat. Res.. Publicado em: 30/03/2017
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20. Comportamiento de la Resistencia al Desgaste entre Depósitos Obtenidos con Electrodos Simple y Doblemente Recubiertos
Abstract The objective of this work was to determine the influence of the relative position of the alloy charge on the electrode coatings on the abrasive wear resistance. For this purpose, three electrodes with similar chemical composition were specially constructed. The electrode variants constructed were differentiated by the position of the alloy charge w
Soldag. insp.. Publicado em: 2017-03
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21. Surface Integrity Analysis in Machining of Hardened AISI 4140 Steel
This study aimed to analyze the residual stresses and roughness in finishing milling of AISI 4140 steel, quenched and tempered up to hardness of 58 HRC. Machining operations were performed with the use of CBN inserts and by varying three basic cutting parameters (cutting speed, feed per tooth and cutting depth). Hardened materials are typically machined by a
Mat. Res.. Publicado em: 23/01/2017
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22. Deposition of Multicomponent Chromium Carbide Coatings Using a Non-Conventional Source of Chromium and Silicon with Micro-Additions of Boron
The chromium carbide coatings are widely used in the mechanical industry due to its corrosion resistance and mechanical properties. In this work, we evaluated a new source of chromium and silicon with micro-additions of boron on the deposition of multi-component coatings of chromium carbides in W108 steel. The coatings were obtained by the pack cementation m
Mat. Res.. Publicado em: 05/01/2017
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23. Influence of Pushing and Pulling the Electrode Procedure and Addition of Second Layer of Welding on the Wear in Hardfacing of Fe-Cr-C
The aim of this work is evaluate the influence of welding conditions on abrasive wear resistance in coating of Fe-Cr-C. The metal base used in this investigation was the steel SAE 1020 and as welded metal the selfshilded tubular wires of Fe-Cr-C with 1.6 mm of diameter. The welding parameter such as amperage, voltage, welding speed, wire feed speed and the d
Mat. Res.. Publicado em: 19/09/2016
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24. Erosion and abrasion-inhibiting in situ effect of the Euclea natalensis plant of African regions
Abstract This study evaluated the effect of Euclea natalensis gel on the reduction of erosive wear with or without abrasion, in enamel and dentin. During two five-day experimental crossover phases, volunteers (n = 10) wore palatal devices containing human enamel and dentin blocks (E = 8 and D = 8). The gel was applied in a thin layer in the experimental grou
Braz. oral res.. Publicado em: 14/06/2016