Abstract This work reports the production of WC-10 wt%Ni nanostructured powders synthesized via carboreduction of a mixture of APT and low-temperature nickel nitrate with a short reaction time in a single synthesis process. The powders were characterized by XRD, TG/DSC, SEM, EDS, TEM and particle size analysis. The WC-10 wt%Ni powders were consolidated by the Spark Plasma Sintering process at different temperatures (1350 °C and 1450 °C). The effect of the sintering temperature on the mechanical properties and microstructure of the sintered composites was investigated through Vickers hardness and density measurements, as well as by SEM and EDS analyzes. The produced powders presented an average crystallite size of 24 nm for the WC and 41 nm for Ni. The samples sintered at 1350 °C showed the best results in terms of morphology and mechanical properties of Vickers hardness (2120 HV) and density (97.67%) when compared to samples sintered at 1450 °C which showed Vickers hardness of 945 HV and a density of 94.60%. The preparation of nanocomposite powders by carboreduction is a highly promising strategy for manufacturing hard metals by SPS, ensuring homogeneity of the phases and refined grain sizes, as well as providing good densification and excellent WC-Ni hardness.

中文翻译：

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碳还原反应制备的纳米结构粉末复合材料（WC-Ni）的放电等离子烧结

摘要 本工作报道了通过 APT 和低温硝酸镍混合物的碳还原在单一合成过程中以较短的反应时间合成 WC-10 wt% Ni 纳米结构粉末。通过XRD、TG/DSC、SEM、EDS、TEM和粒度分析对粉末进行表征。WC-10 wt% Ni 粉末通过火花等离子烧结工艺在不同温度（1350 °C 和 1450 °C）下固结。通过维氏硬度和密度测量以及SEM和EDS分析研究了烧结温度对烧结复合材料机械性能和微观结构的影响。所生产的粉末的平均微晶尺寸对于 WC 为 24 nm，对于 Ni 为 41 nm。与在 1450 °C 下烧结的样品相比，在 1350 °C 下烧结的样品在维氏硬度 (2120 HV) 和密度 (97.67%) 的形貌和力学性能方面表现出最好的结果，维氏硬度为 945 HV，密度为94.60%。通过碳化还原制备纳米复合粉末是通过 SPS 制造硬质金属、确保相的均匀性和细化晶粒尺寸以及提供良好的致密化和优异的 WC-Ni 硬度的一种非常有前景的策略。