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- W4282919829 abstract "Using the traditional preparation method of TiC+TiN powder mixture or simply the Ti(C, N) solid-solution powder to prepare cermet cannot properly avoid the direct contact between TiC, TiN or Ti(C, N) phase and (CoNi) binder phase with undesirable wettability, which is disadvantageous to the strength and toughness of cermet. Here, we introduced a new routine using the (Ti, W)(C, N) solid-solution powder and studied the resultant phase constitutions, microstructures and properties of the Ti(C, N)-based cermets, where the cermets prepared with TiC + TiN + WC and Ti(C, N) + WC were taken as counterparts. The X-ray diffraction (XRD) results showed that regardless of the powder combination, two phases, i.e. fcc-(Ti, M)(C, N) and fcc-(CoNi), were formed, and the lattice constants of these phases varied in different samples, which is attributed to the specific phase stability (TiN > Ti(C, N) > (Ti, W)(C, N) > TiC) calculated based on the CALPHAD (CALculation of PHAse Diagrams) approach. Transmission electron microscopic (TEM) observations further depicted that besides the already-known core-rim structure, the cermet prepared using (Ti, W)(C, N) uniquely incorporated black-gray rimless grains and black-white-gray rimless grains. Two critical mechanical properties, i.e. hardness (H) and fracture toughness (KIC), were subsequently determined using the Vickers indentation method. It was found that the KIC values of the cermet prepared using (Ti, M)(C, N) were improved by 5.1% ~ 29.2% while maintaining the similar level of H as other cermet samples. The segregation of W and Ti in (Ti, W)(C, N) powders led to the formation of cleavage facets in ceramic grains, which could contribute to the hinderance of crack propagation. Eventually, the high-temperature (750 °C) wear tests were conducted to examine the durability of cermet samples. The cermet prepared using (Ti, M)(C, N) generally exhibited enhanced wear resistance, benefiting from the well-balanced H and KIC as well as the restraint of oxidational wear. Thus, this work suggested that preference should be given to (Ti, W)(C, N) solid-solution powders when fabricating high-performance Ti(C, N)-based cermets." @default.
- W4282919829 created "2022-06-16" @default.
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- W4282919829 date "2022-11-01" @default.
- W4282919829 modified "2023-09-26" @default.
- W4282919829 title "Enhancing mechanical properties of Ti(C, N)-based cermets via preparation with (Ti, W)(C, N) multi-component powder" @default.
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- W4282919829 doi "https://doi.org/10.1016/j.ijrmhm.2022.105931" @default.
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