Influences of Ultrafine Ti(C, N) on the Sintering Process and Mechanical Properties of Micron Ti(C, N)-Based Cermets

Ma, Lili; Zhao, Zaiyang; Wu, Yaowen; Sun, Jingjing; Gu, Shuang‐Xi; Zhang, Houan

doi:10.3390/ma16083175

Cited by 4 publications

(4 citation statements)

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“…The presence of CoTiO3, NiTiO3, 6b). This shift indicates the occurrence of the solid-phase sintering phenomenon at this temperature, leading to substantial incorporation of W and Mo into the Co/Ni phase [10]. Consequently, it can be inferred that a reduction temperature of 1300 Co6W6C, and WC phases also indicates the occurrence of an oxidation-decomposition reaction during the in-situ reduction process of (Ti,Me)(C,N).…”

Section: Influence Of Reaction Temperaturementioning

confidence: 87%

“…However, this article did not investigate the impact of ultrafine coated powders on the mechanical properties of Ti(C,N)-based cermets. According to the literature reports [10], the particle size of the raw materials directly influences the preparation process of cermets. Therefore, it is necessary to systematically study the preparation process of alloys in order to obtain optimal mechanical properties.…”

Section: Discussionmentioning

confidence: 99%

“…Furthermore, in comparison to the samples at 900 °C and 1100 °C, a noticeable shift in the peak position of the Co/Ni phase was observed for the samples treated at 1300 °C (Figure 6b). This shift indicates the occurrence of the solidphase sintering phenomenon at this temperature, leading to substantial incorporation of W and Mo into the Co/Ni phase [10]. Consequently, it can be inferred that a reduction temperature of 1300 °C is excessively high.…”

Section: Influence Of Reaction Temperaturementioning

confidence: 94%

“…However, the wide range of applications of cermets is limited by their low toughness. To improve their toughness and strength, the primary research on Ti(C,N)-based cermets has focused on grain refinement [9,10] and the addition of nano-strengthened phases [11,12]. For example, by adding 50 wt.% ultrafine Ti(C,N) powders, Lin et al [9] prepared cermets with improved mechanical properties and wear resistance, and Zhang et al [12] showed that Ti(C,N)-based cermets with 2 wt.% nano-Al 2 O 3 increased tool life by about 50%.…”

Section: Introductionmentioning

confidence: 99%

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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

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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.

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Section: Influence Of Reaction Temperaturementioning

confidence: 87%

Section: Discussionmentioning

confidence: 99%

Section: Influence Of Reaction Temperaturementioning

confidence: 94%