The production and synthesis mechanism of submicron Ti(C,N)-based cermets by reactive hot-pressing technology from a Co–Ti–C–BN system
Source abstract
Abstract
The phase formation mechanism of Ti(C,N)–TiB2–Co composite cermets during the reactive hot-pressing process was investigated by delicate microstructure and phase analysis of Co–Ti–C–BN powder compacts sintered at different temperatures. The results showed that Ti–BN and Co–Ti solid diffusion reactions occurred. As the sintering temperature was increased 1020°C, Co–Ti liquid was formed by the eutectic reaction between Ti and the preformed CoTi2. Subsequently, TiB combined with B to yield TiB2 through the mass transfer of liquid, whereas Ti0.3N and Ti2N gradually transformed into TiN. With increasing sintering temperature, Ti(C,N) was fabricated by the diffusion of C into TiN unit cell, and B reacted with Ti affording TiB2. High-density submicron Ti(C,N)-based cermets could be synthesized at low temperatures due to the formation of Co–Ti liquid at 1020°C and an applied pressure of 34 MPa. The Ti(C,N)–TiB2–Co composite cermets prepared at 1150°C possessed the optimum relative density, average particle size, hardness, and fracture toughness of 99.8%, 0.571 µm, 1947 HV10, and 6.6 MPa·m1/2, respectively. Moreover, the dry friction and wear resistance of Ti(C,N)–TiB2–Co composite cermets is 2.5 times higher than that of YT15 cemented carbide.
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Research context
OpenAlex topics: Advanced materials and composites · Advanced ceramic materials synthesis · Aluminum Alloys Composites Properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Scholl of Naval Architecture & Ocean Engineering, Jiangsu Maritime Institute
Jiangsu Key Laboratory of Precision and Micro-Manufacturing Technology, Nanjing University of Aeronautics and Astronautics
Jiangxi Province Engineering Research Center of Materials Surface Enhancing & Remanufacturing, School of Mechanical and Materials Engineering, Jiujiang University
Zhejiang Provincial Key Laboratory for Cutting Tools, Taizhou University
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