ANALYSIS OF THE SURFACE POROSITY OF A SINTERED COPPER-NICKEL ALLOY OF DISSOCIATED METALLIC POWDERS 1 Ricardo Cadaval Gonçalves, 1 Diego Rodrigues da Silva, 1 Luciano VolcanogloBiehl, 1 Jorge Luis Braz Medeiros, * 2 José de Souza, 3 Elton Gimenez Rossini, 4 Alexandre Beluco and 4 Alfonso Risso 1 Universidade Federal de Rio Grande (FURG) - PPMec - Av. Itália, Km 8 - Campus Carreiros - Rio Grande/RS - 96201900 – Brazil; 2 Fundação Liberato (FETLSVC) - DPPI - Rua Inconfidentes, 395, Bairro Primavera, Novo Hamburgo/RS - 93340140 – Brazil; 3 Universidade Estadual do Rio Grande do Sul (UERGS) - Engenharia - Rua 7 de Setembro, 1156 - Centro Histórico, Porto Alegre - RS 90010191 – Brazil; 4 Universidade Federal do Rio Grande do Sul (UFRGS) - IPH - Av. Bento Gonçalves, 9500 - Porto Alegre/RS - 91509900 – Brazil ARTICLE INFO ABSTRACT Powder Metallurgy P.M. is a technique that uses the principle of forming metal alloys from the mixture of metal powders to form materials with particular characteristics such as controlled hardness, mechanical strength, and porosity. It is possible to develop this control by varying the parameters, such as temperature and pressure of compaction, reaching the desired levels. This paper evaluated the behavior of surface porosity in the variation of the copper-nickel concentration of dissociated powders, maintaining sintering temperature and compaction pressure constant. To determine the porosity of the copper-nickel alloy, the Scanning Electron Microscope (SEM), ImageJ, and statistical calculations used to generate graphs to represent the results. The results indicated that there was no linear behavior of the surface porosity. Copyright © 2020, Ricardo Cadaval Gonçalves et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. INTRODUCTION New properties in the metal alloys have been researched and are being achieved with the same materials, but with new compositions, additions of alloying elements, techniques involving mainly the management of energy and time. To optimize profitability and compliance with environmental standards, Powder Metallurgy is at the forefront of most conventional techniques, such as smelting, when considering such criteria [1-2]. There is a trend to explore sintered materials for the manufacture of self-lubricating bearings and products with complex geometry and good quality finishing. Elimination of the need for finishing processes such as machining or polishing. Self-lubricating bearings are a new trend as oil passes through the pores of the bearing material [3- 4]. By determining the porosity rate of the material, it is possible to determine the oil flow that will reach the axis. This paper aimed to realize the sintering of copper-nickel alloy to analyze the influence of the independent variable, chemical composition, of the alloy on the mechanical-metallurgical properties and analyze the crystalline structure microscopically to determine the degree (percentage) of porosity of the piece, using software, influenced by the effect of the independent variable. Powder Metallurgy (PM) consists of the technique of transforming metal powders into parts with excellent strength, without melting, but only using pressure and heat [5-6]. The P.M. technique differs from the other manufacturing processes by the absence of the liquid phase or the occurrence of this stage in only one of the materials involved. Parts with complex geometries fabricated with the least waste of material since the part will not require subsequent finishing processes [7-8]. P.M. is composed of two phases, one of compaction or molding and the other of heating or sintering [9-10]. Nickel is one of the most versatile materials in metallurgy and is an essential alloying element present in many materials such as cast irons, ISSN: 2230-9926 International Journal of Development Research Vol. 10, Issue, 06, pp. 36766-36770, June, 2020 https://doi.org/10.37118/ijdr19032.06.2020 Article History: Received xxxxxx, 2019 Received in revised form xxxxxxxx, 2019 Accepted xxxxxxxxx, 2019 Published online xxxxx, 2019 Available online at http://www.journalijdr.com Citation: Ricardo Cadaval Gonçalves, Diego Rodrigues da Silva, Luciano Volcanoglo Biehl et al. 2020. “Analysis of the surface porosity of a sintered copper-nickel alloy of dissociated metallic powders”, International Journal of Development Research, 10, (06), 36766-36770. RESEARCH ARTICLE OPEN ACCESS Article History: Received 17 th March, 2020 Received in revised form 26 th April, 2020 Accepted 22 nd May, 2020 Published online 29 th June, 2020 Key Words: Surface porosity; Copper-nickel alloy; Powder Metallurgy; Sintering. *Corresponding author: José de Souza,