Diamante A&T Contents
Issue 103

Year XXVII - March 2021

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Via G. Bortolan 42, 31050 Vascon di Carbonera (TV) - Italy

MBN Nanomaterialia offer to the market innovative materials for several applications in powder metallurgy, surface technologies and laser deposition sectors.


In the Spotlight

08) Veronafiere confirms the next physically attended edition of Marmomac from 29 September to 2 October

12) EMO MILANO 2021 presents "The magic world of metalworking" at fieramilano Rho from 4 to 9 October

Industrial Diamond

28) Influence of diamond-lonsdaleite abrasive additives on the structure and properties of reactional Sic ceramics

by L.N. Dyachkova, A.Ph. Ilyushchanka, V.A. Osipov, D.V. Babura
SSI "O.V.Roman Powder Metallurgy Institute", National Academy of Sciences of Belarus, Minsk, Belarus

Abstract: SiC-ceramics have a unique hardness, second only to the hardness of diamond and boron carbide, high thermal conductivity and corrosion resistance. These properties are of great interest to them as promising materials for instrumental products. Increasing the wear resistance of silicon carbide ceramics can be achieved by introducing more solid additives. Diamond-lonsdaleite abrasive (DLA) is a new type of mineral raw materials which has a high abrasive ability, 1.5-2 times higher than the abrasive ability of natural and synthetic diamonds due to the peculiarity of their structure. DLA has cubic and hexagonal lattices and is characterized by the absence of graphitization catalysts. The influence of DLA content on the formation of the structure and properties of reactional SiC ceramics, the modes of its formation and sintering is studied. It is established that the introduction of 40% DLA leads to a decrease of the wear of silicon carbide material by 6 times.

Raw Materials

42) Renaissance of flake graphite in Finland - Part I: new resources for technical innovations

by S. Leinonen, Geological Survey of Finland, Kuopio office, Finland

Abstract: Exploration of flake graphite is getting new interest in Finland due to the fast-growing market of Li-ion batteries. Graphite is also one of the critical minerals listed by the European Commission. Historical production ended since late 40s in Finland, most usage as lubricants, refractory bricks and crucibles. Preliminary results of new flake graphite deposits show both high mineralogical quality and carbon content. Beneficiation tests and chemical purification as well studies as battery anodes were done in Business Finland funded Green Minerals-project, active in years 2018-2020. Geological Survey of Finland is responsible organization for both exploration of new resources and specific studies whether the graphite can be utilized for certain technical materials. Graphite is a sheet structured carbon mineral offering a wide range of properties for industrial uses. Graphite has an excellent electrical and thermal conductivity, specific lubrication properties, also a high temperature and oxidation resistance. Graphite is traditionally used as a carbon riser in various steels grades and in gray iron production. It is a compound of hard metals and ceramics as well providing appropriate strength and hardness for sintered components like hot press consolidated diamond-metal composite cutting tools. This review gives a short introduction to the graphite mineral and its industrial applications, later appearing second part summarizes technical properties of the new graphite types and manufacturing tests for powder metallurgy materials and Li-ion battery anodes.

Metal Powders

59) Integrated approach towards the validation of metal powders: the NEWMAN case study

by G. Broglia1, N. Raule1, G. Zompi2, J. Rossi2, A. Morri2, A. Bianchini2, G. Mazzola2, F. Della Ricca3
1 CRIT Srl, Italy
2 Universitā di Bologna, Italy
3 Höganäs Italy

Abstract: Nowadays, the methodologies used to research and select new materials should be revised. Criteria related to environmental impact, human health and economic sustainability are already influencing in industrial sectors and they are becoming fundamental in material choice. Therefore, these concepts must be considered at research level by adopting an integrated approach: it should be able to evaluate every aspect that may affect the industrial use of materials. The NEWMAN project, supported by EIT Raw Materials, aims to study and validate new Nickel-free metal powders respect to mechanical performance and sustainability. The project scope will take into account not only the mechanical properties, but it will evaluate also the level of environmental and economic impact of the new powders. Key aspect is the synergy among the analysed properties: the partners will continuously share the collected data in order to maximize the economical, mechanical and environmental performances of the powders.

News and Events

66) Meet Vitrum 2021: where the glass industry comes alive - The next edition of Vitrum revealed

72) Stone Industry, the international exhibition for stone quarrying, processing and application

76) Margherita Serra, the passion for art was born with her