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http://dx.doi.org/10.3740/MRSK.2022.32.1.44

Sintering Behavior and Mechanical Property of Transition Metal Carbide-Based Cermets by Spark Plasma Sintering  

Lee, Jeong-Han (Korea Institute of Industrial Technology (KITECH), Automobile Materials and Components R&D Group)
Park, Hyun-Kuk (Korea Institute of Industrial Technology (KITECH), Automobile Materials and Components R&D Group)
Hong, Sung-Kil (Chonnam National University, Materials Science & Engineering)
Publication Information
Korean Journal of Materials Research / v.32, no.1, 2022 , pp. 44-50 More about this Journal
Abstract
Transition metal carbides (TMCs) are used to process difficult-to-cut materials due to the trend of requiring superior wear and corrosion properties compared to those of cemented carbides used in the cutting industry. In this study, TMC (TiC, TaC, Mo2C, and NbC)-based cermets were consolidated by spark plasma sintering at 1,300 ℃ (60 ℃min) with a pressure of 60 MPa with Co addition. The sintering behavior of TMCs depended exponentially on the function of the sintering exponent. The Mo2C-6Co cermet was fully densified, with a relative density of 100.0 %. The Co-binder penetrated the hard phase (carbides) by dissolving and re-precipitating, which completely densified the material. The mechanical properties of the TMCs were determined according to their grain size and elastic modulus: TiC-6Co showed the highest hardness of 1,872.9 MPa, while NbC-6Co showed the highest fracture toughness of 10.6 MPa*m1/2. The strengthened grain boundaries due to high interfacial energy could cause a high elastic modules; therefore, TiC-6Co showed a value of 452 ± 12 GPa.
Keywords
spark plasma sintering; cermets; transition metal carbide; densification; mechanical property;
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