Fabrication of chromium carbide cermets by electric resistance sintering process: Processing, microstructure and mechanical properties. (February 2021)

• Record Type: Journal Article
• Authors: Lagos, M.A.; Agote, I.; Leizaola, I.; Lopez, D.; Calero, J.A.
• Is Part Of: International journal of refractory metals & hard materials. Volume 95(2021)
• Publication Date: 2021-02
• Subjects: Heat resistant alloys -- Periodicals; Refractory materials -- Periodicals; Metallography -- Periodicals; Alliages réfractaires -- Périodiques; Matériaux réfractaires -- Périodiques; Métallographie -- Périodiques; Heat resistant alloys; Metallography; Refractory materials; Periodicals; Electronic journals; 669.73
• DOI: 10.1016/j.ijrmhm.2020.105417
• Languages: English
• ISSNs: 0263-4368

Abstract

Abstract: Chromium carbide-based cermets are suitable for use in abrasive and corrosive environments. This work presents the fabrication of chromium carbide-based cermets by a very fast sintering process: Electric Resistance Sintering. The thermal cycle duration was less than 1 s and without protective atmosphere. Two different compositions were studied: Cr3 C2 -25NiCr (wt%) and WC-20Cr3 C2 -7Ni (wt%). Microstructure and crystallographic phases of the initial powders and sintered materials are presented. In addition, hardness and toughness were characterized and compared to conventional materials. One important issue of ERS is the size and homogeneity of the pieces. This work presents the also the fabrication of a mining wear piece and some aspects about scaling up. Highlights: Development of a new process for the fabrication of chromium carbide based-hard materials Processing parameters and two different carbide compositions, including one composition with WC Use of agglomerated and pre-sintered powders for the ERS technology (typical powder for thermal spray) Microstructural and mechanical characterization of the obtained materials and phase analysis. Practical considerations about the technology regarding sample size and scalability