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• W4294578248 abstract "A novel reaction hot pressing process was developed for the fabrication of in situ (Mo,Ti)(C,N)-based cermets without a conventional core/rim structure. Moreover, the reaction mechanism of the Co–Mo–Ti–TiN–C system was investigated. The results indicate that the allotropic transformation of hexagonal εCo→cubic αCo occurred first. Then, solid-state reactions of powder mixtures were conducted, which contributed to the synthesis of Mo2C, CoTi2, and TiC. Continuous heating induced a peritectic reaction of CoTi2→CoTi + Co–Ti liquid. The presence of a Co–Ti liquid facilitated the dissolution of C, and the production of a Co–Ti–C melt. In the liquid, TiC was prepared. Then, in situ TiC was combined with ex situ TiN to synthesise Ti(C,N). As the temperature increased, Mo/Mo2C diffused into whole Ti(C,N) particles, resulting in the formation of micro coreless (Mo,Ti)(C,N) grains. Subsequently, residual Mo2C and part of (Mo,Ti)(C,N) dissolved into a Co–Ti–C liquid, resulting in the formation of a Co–Mo–Ti–N–C melt. Once the liquid became saturated, ultrafine (Mo,Ti)(C,N) particulates with a weak or non-existent core/rim structure were precipitated. (Mo,Ti)(C,N)-based cermets can be prepared at 1523 K. An increased sintering temperature enhanced the relative density and homogeneity of the cermets, eliminated the by-products Mo2C and Co3Mo, and promoted the formation of more ultrafine (Mo,Ti)(C,N) particles. These effects increased the hardness and fracture toughness of the prepared cermets. The results of this work provide valuable guidance for the development of in situ coreless Ti(C,N)-based cermets." @default.
• W4294578248 created "2022-09-05" @default.
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• W4294578248 date "2022-12-01" @default.
• W4294578248 modified "2023-10-14" @default.
• W4294578248 title "The production of in situ (Mo,Ti)(C,N)-based cermets without a core/rim structure by reaction hot pressing: Formation mechanism and mechanical properties" @default.
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• W4294578248 doi "https://doi.org/10.1016/j.ceramint.2022.08.305" @default.
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