Experimental Investigations into Machining Characteristics of Niobium Carbide Cermet with µECM / hybrid laser-µECM.
نویسندگان
چکیده
Niobium carbide (NbC) is a high hardness 1960 (HV30) cermet material which finds applications in the moulds for ceramic injection moulding as well inserts cutting tools. This possesses excellent combination of hardness, toughness and thermal shock resistance. The use nickel (Ni) binder makes it promising such applications, especially view rising cobalt (Co) metal prices used conventional tungsten (WC-Co) cermet. tool-wear tool-failure issues make difficult mechanical machining technologies to process this material, micromachining regime (< 2 mm). To address machinability challenges, electrically conductive Nb has been developed inhouse with Ni material. suitable workpiece candidate electrochemical (ECM) electrical discharge (EDM) processes. Therefore, experimental investigations are presented work evaluate characteristics NbC micro-ECM process. Channels have test-features evaluating machinability. Furthermore, two different grades cermets machined identify effect WC addition on dissolution possible passivation during ECM. A micro-second pulsed voltage source utilized controlled localized removal. further enhance removal mechanisms terms processing speed weakening passivating layer, assisted nano-second laser an in-house hybrid machine-tool. aim uniformly dissolve matrix ECM integrity surface. analysed through current pulse acquisition channel profile characterisation. Linear sweep voltammetry revealed that significant impact stability passive layer. Laser assistance could both promote uniform dissolution, being more pronounced grade without (41 % increase average peak current) due weaker film. was LECM strong along walls.
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ژورنال
عنوان ژورنال: Procedia CIRP
سال: 2022
ISSN: ['2212-8271']
DOI: https://doi.org/10.1016/j.procir.2022.09.188