Please use this identifier to cite or link to this item: http://hdl.handle.net/10316/93570
Title: Metal matrix composites reinforced with diamond particles
Other Titles: Metal matrix composites reinforced with diamond particles
Authors: Aliyi, Idiris Mehamud
Orientador: Trindade, Bruno Miguel Quelhas de Sacadura Cabral
Torres, Emilio Frutos
Keywords: Síntese mecânica; texturação de superfícies; mechanical alloying; surface texturing
Issue Date: 24-Jul-2019
Serial title, monograph or event: Metal matrix composites reinforced with diamond particles
Place of publication or event: Departamento de Engenharia Mecânica
Abstract: Materials surface modification aims for the development of new material’s surfaces throughdifferent methods to improve their structure, phase composition, tribological, physical andmechanical characteristics in addition to their chemical composition. Future of glass industrypasses through solving the plunger surfaces modification to reduce friction and wear duringblowing or pressing stage of production. This thesis aims to study the modification of plungersurfaces through the design of metal matrix composite material located on the surface of Cu-BeCo substrate, reinforced with diamond particles, which surfaces will be functionalized with a lowmelting alloy to improve the adherence of diamonds. Metal matrix from Cu-Be-Co substrate’sreinforced by of diamond particles with a low melting alloy of copper-tin-titanium.Mechanical alloying through Ball milling technique has been simultaneously used to designthe low melting Cu-Sn-Ti alloy and diamonds surface functionalization. The 4.81 gr of powderparticles ( 10 % of diamonds, and the remain composition from 75% wt of Copper 15% wt of Ti,10% of tin and 1-3% of stearic acid) have been mixed and alloyed into an 80 ml vessel. Thesubstrate Cu-Be-Co surface’s texturized by laser to produce a pattern on the surface as a matrix,then functionalized diamond particles will be introduced into the matrix by cold isostatic press andsintering. For interpretation of the result, the main experimental procedures have beeninvestigated to characterize the properties of substrate (Cu-Be-Co), functionalized diamondparticles (diamond + Cu-Sn-Ti +stearic acid) and the metal matrix’s composites reinforced bydiamond particles. Hardness testing, X-Ray Diffraction (XRD), Scanning Electron Microscopy(SEM), Energy Dispersive X-Ray Spectroscopy (EDS), and tribological testing Pin-on-desk testsperformed as characterization techniques.Despite the presence of a variety of oxides, the reinforced material exhibited better tribologicalperformance than the unreinforced Cu-Be-Co when tested on a pin-on-disk. As a consequence,significantly reduces of wear resistance and coefficient of friction attained, up to 12 times lowerwear rate and 11% reduce of COF respectively.
Materials surface modification aims for the development of new material’s surfaces through different methods to improve their structure, phase composition, tribological, physical andmechanical characteristics in addition to their chemical composition. Future of glass industrypasses through solving the plunger surfaces modification to reduce friction and wear duringblowing or pressing stage of production. This thesis aims to study the modification of plunger surfaces through the design of metal matrix composite material located on the surface of Cu-BeCo substrate, reinforced with diamond particles, which surfaces will be functionalized with a lowmelting alloy to improve the adherence of diamonds. Metal matrix from Cu-Be-Co substrate’sreinforced by of diamond particles with a low melting alloy of copper-tin-titanium. Mechanical alloying through Ball milling technique has been simultaneously used to designthe low melting Cu-Sn-Ti alloy and diamonds surface functionalization. The 4.81 gr of powderparticles ( 10 % of diamonds, and the remain composition from 75% wt of Copper 15% wt of Ti,10% of tin and 1-3% of stearic acid) have been mixed and alloyed into an 80 ml vessel. Thesubstrate Cu-Be-Co surface’s texturized by laser to produce a pattern on the surface as a matrix,then functionalized diamond particles will be introduced into the matrix by cold isostatic press andsintering. For interpretation of the result, the main experimental procedures have beeninvestigated to characterize the properties of substrate (Cu-Be-Co), functionalized diamondparticles (diamond + Cu-Sn-Ti +stearic acid) and the metal matrix’s composites reinforced bydiamond particles. Hardness testing, X-Ray Diffraction (XRD), Scanning Electron Microscopy(SEM), Energy Dispersive X-Ray Spectroscopy (EDS), and tribological testing Pin-on-desk testsperformed as characterization techniques.Despite the presence of a variety of oxides, the reinforced material exhibited better tribologicalperformance than the unreinforced Cu-Be-Co when tested on a pin-on-disk. As a consequence,significantly reduces of wear resistance and coefficient of friction attained, up to 12 times lowerwear rate and 11% reduce of COF respectively.
Description: Dissertação de Mestrado Conjunto Europeu em Tribologia de Superficies e Interfaces apresentada à Faculdade de Ciências e Tecnologia
URI: http://hdl.handle.net/10316/93570
Rights: openAccess
Appears in Collections:UC - Dissertações de Mestrado

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