Increased tool performance with niobium carbide based cutting materials in dry cylindrical turning

The Effects of Sinter-Hip Processing on the Machining Performance of Cemented Carbides Based on NBC-NI Systems as Alternative Cutting Tools

“…Several studies are being carried out into the development of products with the addition of niobium: steels for on-shore piping for oil as well as gas pipelines that work in more extreme environments; niobium microalloyed steels for weight reduction of products; orthopedic prostheses with niobiumtitanium and titanium-niobium-zirconium alloys by additive manufacturing; cermets and niobium-based coatings for applications in tools, nickel-based superalloys and alloys for applications at high temperatures [1,11,12,13,14,15]. All these recent studies have made it possible to propose a new approach in the sintering process for the fabrication of NbC-Ni based cutting tools.…”

“…Niobium carbide has not been constrained by any critical assessment to date. On the other hand, compositions used to obtain WC-Co powder through the reduction process, such as tungsten trioxide (WO 3 ) and tricobalt tetroxide (Co 3 O 4 ), have received several classi cations due to mutagenic problems, carcinogenic toxicity by REACH [1,2,11,13].…”

Microstructure and mechanical properties of (Nb,W,Ti)(C,N)-Ni solid solution cermets with 6 to 20 wt% Ni

“…A small amount of NbC addition effectiely results in the inhibition of the WC and Ti(C,N) grain growth, leading to improved flexural strength and thermal shock resistance [7,8]. Recently, Ni bonded NbC matrix inserts were reported to have a pronounced tool life as compared to much harder uncoated WC-Co inserts [6,9,10]. NbC matrix cermets, with a hardness above 1400 kg/mm 2 , demonstrated successful hard turning operations of a gear steel and peripheral milling of carbon fibre refinforced polymers [6,10].…”

Ferramentas de corte a base de carbonetos cimentados (metais duros) aplicadas ao torneamento de aço AISI 4340 endurecido: contribuição ao estudo de substituição ao sistema WC-Co por uma alternativa NbC-Ni.

“…Um dos fatores que inibe a demanda internacional de nióbio é o pouco interesse de outros países em investir em pesquisa para desenvolver novas aplicações do nióbio, pois sua exploração está concentrada praticamente em solo brasileiro (VASCONCELOS, 2019). Porém, recentemente há várias publicações internacionais sendo realizadas com o intuito de desenvolvimento deste metal (WOYDT et al, 2016;WOYDT et al, 2018;MOHRBACHER, 2014;HUANG et al, 2015;HUANG et al, 2017;HUANG et al, 2018;ZHAI, 2011;UHLMANN et al, 2018;MONTENEGRO et al, 2018).…”

“…Na Tabela 2 são resumidas algumas das principais propriedades físicas à temperatura ambiente do carboneto de nióbio estequiométrico comparado ao carboneto de tungstênio publicado na literatura (UHLMANN et. al, 2018;WOYDT et al, 2016): • A temperatura de fusão do NbC é particularmente alta, o que deve limitar a redução da dureza em função da temperatura, bem como a tendência ao desgaste por adesão;…”