Diamante A&T Contents
Year XXV - December 2019
Front Cover: FRATELLI MILANO SRL
Presses oleo-dynamic volumetric for powder compacting for: hard metal, diamond tools, abrasive wheels, ceramic. Fratelli Milano operates on the market since 1985, first only as technical designer and then as manufacturer. The company purpose is to give customers a "complete prompt delivery" for all standard and special machines.
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18) Scratch tests with diamond tools on the innovative construction material carbon concreteby J. Dreier, M. Kansteiner, D. Biermann
TU Dortmund University, Institute of Machining Technology, Dortmund, Germany
Abstract: Concrete is used globally in the construction industry. It is unsuitable for absorbing tensile stresses without reinforcements made of steel. However, carbon steel is susceptible to corrosion and requires a thick minimum concrete covering layer. An innovative new type of concrete, called carbon concrete, offers an alternative to conventional steel reinforced concrete in terms of sustainability, new design possibilities and areas of application. Diamond-impregnated tools are used for machining this new composite material, just as in the machining of conventional steel reinforced concrete. The grinding process can be analysed in detail by reducing it to a single abrasive grain. This paper presents the influence of the diamond grain shape on the material removal process of both the concrete and carbon phases. The evaluation of the scratch tests is based on process forces and the scratch grooves.
28) Study of the influence of pressure and temperature in the diamond reinforced composites propertiesby Rita Ferreira1, Ângela Cunha1, Oscar Carvalho1, Bruno Trindade2, Luis Sobral3, Sandra Carvalho4,
1 Center for Micro-Electro Mechanical Systems (MEMS), Università di Minho, Guimarăes, Portugal
2 CEMMPRE - Center for Mechanical Engineering, Materials and Processes, Università di Coimbra, Coimbra, Portugal
3 MAHLE, Componentes de Motores S.A., Cantanhede, Portugal
4 GRF-CFUM, Dipartimento di Fisica, Università di Minho, Guimarăes, Portugal
Abstract: Diamond-reinforced composites represent a potential solution for applications where wear resistance is a key demand, such as for engine piston rings. Powder metallurgy allows the joining of different materials, in order to combine several characteristics such as wear resistance and thermal properties in a single material. However, the material manufacturing conditions may influence the final properties of that material. Regarding that diamond particles have the limitation of a graphitization temperature around 800°C in air, its manufacturing conditions must be selected to not interfere with its crystalline structure. In the present work, a diamond-reinforced composite was produced using the hot pressing technique, to evaluate if higher pressure conditions influence the graphitization temperature. Several pressure and temperature values were used to study the influence of the sintering conditions on the final microstructure and properties.
40) E-ForgingTM AlSi10 and AlSi10Mg0.4 powders with two distinct particle sizesby Alessandro Fais1, Federico Gobber2, Ilaria Rampin3, Robert Bidulsky2, Marco Actis Grande2
1 EPoS srl, Rivoli, Italy
2 Politecnico di Torino, Torino, Italy
2 Kymera International, Velden, Germany
Abstract: Electro-Sinter-Forging or e-forging is a novel production technique that is gaining traction in different areas of manufacturing: from the production of parts in precious materials to diamond abrasives, from hard steel components to hardenable gears. In this work we present for the first time the results concerning the consolidation to full density of aluminium powders. Two commercial grades have been chosen, AlSi10 and AlSi10Mg0.4, in two different granulometric distributions, to understand the influence of the addition of magnesium and of the different particle sizes on the properties of the final parts. A complete metallurgical characterization of the e-forged material will be presented.
48) Recent progress in the characterisation of cemented carbides at the nanoscale by TEMby S. Lay, J.M. Missiaen
Univ. Grenoble Alpes, CNRS, Grenoble, France
Abstract: A global approach coupling controlled experiments, characterisation at different scales and modelling, is a way for in depth knowledge of materials and microstructure tailoring. This review deals with aspects in the development of cemented carbides where electron microscopy was used at the nanometric or atomic level in recent years. Advances in the field of grain growth or inhibiting grain growth mechanisms, binder composition effects or mechanical property improvement obtained by structural or chemical nanoscale characterisation are presented.
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