Abstract
Ti(C, N)-TiB2 composite cermets with different binders (high entropy alloy (HEA) or Ni-Co) were fabricated by mechanical alloying and vacuum hot-pressing sintering. The wear resistance of the two composite cermets at elevated temperatures was studied. Wear mechanism was characterized by a combination of scanning electron microscopy and energy dispersive spectroscopy. The experimental results indicated that HEA binder composite cermets possessed excellent wear resistance comparing with Ni-Co binder composite cermets. At lower temperatures, no obvious difference was observed in the worn surfaces of two cermets. Abrasive wear mechanism was dominant wear mechanism. At greater than 600 °C, oxidative wear and adhesive wear were found to be dominant wear mechanism. The wear rate of the HEA binder composite cermets was 11.8 %, 17 %, 39.25 %, and 46.7 % lower than that of the Ni-Co binder composite cermets at 200 ℃, 400 ℃, 600 ℃, and 800 ℃, respectively. The enhanced wear performance of Ti(C, N)-TiB2-HEA composite cermets is attributed to relatively high hardness and toughness, as well as excellent high-temperature softening resistance and oxidation resistance of HEA.
Highlights
WC-Co cemented carbide is widely used in machining, metallurgy, aerospace and other fields, attributing to its high hardness, strength, wear resistance, and corrosion resistance [1,2,3,4]
Enhanced wear performance of Ti(C, N)-TiB2-High entropy alloy (HEA) composite cermets is attributed to relatively high hardness and toughness, as well as excellent high-temperature softening resistance and oxidation resistance of HEAs
Ti(C, N)-based cermet materials have received extensive attention attributing to their high hardness, excellent wear resistance, thermal shock resistance, and high-temperature oxidation resistance
Summary
WC-Co cemented carbide is widely used in machining, metallurgy, aerospace and other fields, attributing to its high hardness, strength, wear resistance, and corrosion resistance [1,2,3,4]. Ti(C, N)-based cermet materials have received extensive attention attributing to their high hardness, excellent wear resistance, thermal shock resistance, and high-temperature oxidation resistance. The cutting temperature of cermet cutting tools can reach in the range 600–1000 °C, and this working condition is quite severe during the dry finishing and semi-finishing process [7] Under this situation, cermet tools with excellent thermomechanical properties, thermal shock resistance, and hightemperature resistance friction and softening resistance are required. Yang et al [13, 14] investigated the high-temperature friction and wear properties of TiN–TiB2 ceramic and found that lubricious oxidized products had a favorable effect on ceramic at high temperature. In this study, the FeCoCrNiAl HEAs were selected as the binder compared to the traditional Ni-Co binder
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