Diamante A&T 119/2025


		Diamante A&T Contents Issue 119 Year XXXI - March 2025 Click on COVER below to browse the Preview of the last issue of Diamante Magazine or download the PDF file. In the Preview PDF file you can find a sample of our contents. For downloading the Full Diamante A&T Magazine please subscribe here


	Front Cover: EURO PM2025 by EPMA The EuroPM Congress & Exhibition is held annually in a different European city and serves as a key event for the international powder metallurgy community. It offers a unique opportunity to meet suppliers, manufacturers, and end users, and to get a close look at the latest technical innovations in the sector. This edition will take place, for the first time, in Glasgow from 14 to 17 September 2025 at the SEC (Scottish Event Campus), a modern conference center easily accessible from the city center. www.europm2025.com In the Spotlight 10) The new grooved diamond wire from Ferriera di Cittadella: optimized cutting and uncompromising sustainability 14) "We will carry Marble Izmir forward to many more 50th and 100th years" 18) A brief review of the 25th China Xiamen International Stone Fair Industrial Diamond 20) Copper-diamond composite with complex shape by GelCasting plus Spark Plasma Sintering di T. Hutsch¹, S. Riecker¹, M. Uhlig², J. Siegenthaler², M. Mühle², T. Studnitzky¹, J. Trapp¹, T. Weißgärber^1,3 ¹ Fraunhofer IFAM Dresden, Dresda, Germany ² Fraunhofer USA, Michigan, USA ³ TU Dresden, Dresda, Germany The trend toward miniaturization in electronic packaging poses challenges in cooling and temperature control, limiting design and efficiency. To address this, interest is growing in complex shaped packaging with enhanced thermal conductivity. Additive technologies actually work for metallic materials but face compatibility issues with complex composites like copper-diamond, known for its high thermal conductivity (up to 700 W/(mK)). This report details efforts to introduce copper-diamond composites to additive manufacturing through GelCasting. Mixtures of copper and diamond powder (up to 60 % diamond volume) underwent optimization for binder systems. Post-sintering using a modified spark plasma sintering process resulted in structures with thermal conductivities measuring 650 W/(mK), 1.6 times that of pure copper. Copper-diamond composites offer a new class of 3D cooling structures, crucial for heat dissipation in microelectronics, power modules, charging infrastructure, and e-mobility... Hard Metal 37) A new method to assess fracture toughness in hardmetals by HV indentation di D.W. Trindade¹, R. da Silva Guimarães¹, R.D. Lugon¹, Q.M. Laurindo¹, M. Filgueira¹ ¹ Science and Technology Center, Advanced Materials Laboratory, State University of Northern Rio de Janeiro, Darcy Ribeiro - UENF, Campos dos Goytacazes, Brasil Abstract: Hardmetals are widely used as cutting, machining and drilling tools for rocks due to their excellent properties of hardness, fracture toughness and wear resistance over a wide temperature range. This study proposed to evaluate the fracture toughness of WC-10%Co carbide, sintered via Spark Plasma Sintering - SPS, through Vickers indentation measures, using a modification of the Palmqvist test, widely used to assess the toughness of cemented carbides, and compare this result with six different conventional models: Shetty, Niihara, Laugier, ISO 28079, Hanyaloglu and Lankford. The model for assess the toughness propose in this study showed similarity with the Palmqvist test. However, there were considerable differences in K_IC values through different models, such 13.36 MPa.m^1/2 and 4.44 MPa.m^1/2, for the same application load. Comparing values of conventional fracture toughness and proposed fracture toughness, the greatest difference in values between fracture toughness was found in the Lankford equation, varying 14.74%. The Hanyaloglu equation showed a smaller difference between the values of fracture toughness, with a greater variation of 3.61%and lower variation of 1.54%. Adequate results of hardness were obtained, maximum of 20.93 ± 0.25 GPa and minimum of 15.76 ± 0.63 GPa, and densification of 99.14 ± 0.47 g/cm³... Metallic Powders 55) Influence of powder transfer on density distribution and geometrical precision in multilevel axi-symmetric parts di M. Zago¹, A. Rambelli², D. Foschi², I. Cristofolini¹ ¹ Università di Trento, Trento, Italy ² Powder Metal B.U., Sacmi Imola s.c., Imola, Italy Abstract: Previous studies have systematically investigated densification in ring-shaped parts. Additionally, the effect of filling parameters on filling and green density was explored, demonstrating the strong influence of the die cavity on the origin of inhomogeneous powder distribution. A uniform density is mandatory for industrial production, so further investigation is necessary, also including the contribution of powder transfer. This work aims at investigating the effect of powder transfer on the density distribution and the geometrical precision in 2-level axi-symmetric parts. Sample geometry was compacted by varying: the filling parameters, powder transfer strategies, and compaction forces. Reference samples were produced by excluding the powder transfer step from the compaction cycle. Green and sintered density distribution were derived, highlighting the effect of filling, powder transfer, and compaction strategies... News and Events 66) UCIMU: in the fourth quarter 2024 machine tool orders on the rise (+11.4%). Domestic orders +33.3%, foreign orders -6.5% 72) Together towards VITRUM2025: the entire glass supply chain united in innovation and sustainability 76) New "CHARME" collection: an exploration of contemporary jewelry shapes, interpreted by Budri