Grain growth behavior in TaC-modified ultrafine Ti(C, N)-based cermets

Zhou, Sheng-Jian; Ouyang, Jia-Hu; Yu, Yong-Bo; Wang, Yu-Jin; Chen, Lei; Liu, Zhan-Guo; Zhou, Yu

doi:10.1016/j.ijrmhm.2024.106625

Cited by 5 publications

(1 citation statement)

References 62 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, the rim formation of the cermets fabricated using the coated powders is more effective than that of traditional cermets [23]. The rapid formation of rim phases further prevented the grain growth of hard particles [29]. Furthermore, the absence of a core-rim structure in cermets fabricated using the coated powders can be explained: due to the small particle size of the raw (Ti,W,Mo,Ta)(C,N) powder and the complete solid solution that has been achieved, this means that there are no remnants of the raw Ti(C,N) to form the core structure.…”

Section: Microstructure Of (Tiwmota)(cn)-based Cermetsmentioning

confidence: 98%

Preparation of Ultrafine Co- and Ni-Coated (Ti,W,Mo,Ta)(C,N) Powders and Their Influence on the Microstructure of Ti(C,N)-Based Cermets

Zhao,

Jia,

Zhang

et al. 2024

Materials

View full text Add to dashboard Cite

The use of metal-coated ceramic powders not only effectively enhances the wettability of the metal–ceramic interface but also promotes a more uniform microstructure in Ti(C,N)-based cermets, which is advantageous for improving their mechanical properties. In this study, ultrafine Co- and Ni-coated (Ti,W,Mo,Ta)(C,N) powders were synthesized via the spray-drying-in-situ carbothermal reduction method. Subsequently, Ti(C,N)-based cermets were effectively fabricated using the as-prepared ultrafine Co- and Ni-coated (Ti,W,Mo,Ta)(C,N) powders. The impact of reaction temperature, heating rate, and isothermal time on the phase and microstructure of prepared powders was analyzed using X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Additionally, the microstructure of the as-sintered cermets was experimentally investigated. The findings reveal that the complete reduction of Co and Ni metal salts, pre-coated on the surface of (Ti,W,Mo,Ta)(C,N) particles, can be achieved through rapid heating (10 °C/min) in a specific temperature range (600–1000 °C) with an isothermal time of 3 h at a lower reduction temperature (1000 °C). The synthesized powders have only two phases: the (Ti,W,Mo,Ta)(C,N) phase and Co/Ni phase, and no other heterogeneous phases were observed with an oxygen content of 0.261 wt.%. Notably, the conventional core–rim structure was not dominant in the cermets obtained from the prepared Co- and Ni-coated (Ti,W,Mo,Ta)(C,N) powders. Moreover, the heterogeneous segregation effect of the Co/Ni coating on the ultrafine powder particles resulted in a finer microstructure than the traditional cermets with the same composition. However, the grain size is mainly in the range of 0.5–0.8 μm. The weaker residual stresses at the core and rim interfaces and the finer particle distributions could theoretically enhance the toughness of Ti(C,N)-based cermets, simultaneously.

show abstract

Section: Microstructure Of (Tiwmota)(cn)-based Cermetsmentioning

confidence: 98%