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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing >Influence of starting powder on the microstructure of WC-Co hardmetals obtained by spark plasma sintering
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Influence of starting powder on the microstructure of WC-Co hardmetals obtained by spark plasma sintering

机译：起始粉末对火花等离子体烧结WC-Co硬质合金显微组织的影响

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摘要

WC-Co hardmetals using different starting powders were densiried by spark plasma sintering (SPS). Sintering cycles were performed at 1240 ℃ for the WC-12 wt. % Co-0.45 wt. % VC grade and 1280 ℃ for the WC-6 wt. % Co grade, applying a pressure of 60 MPa in combination with a heating rate of 100 ℃/min. The influence of the carbon content and homogeneity of the starting powders on the final microstructure and mechanical properties was investigated. A thin graded surface layer is observed in case of slightly carbon deficient starting powder. Co agglomerates were observed in the SPS materials obtained from lower energetically multi-directionally mixed WC-Co powder, whereas a homogeneous microstructure was obtained when using attritor-milled or chemically synthesized WC-Co starting powder with adjusted carbon balance. The observed microstructures are related to the measured mechanical properties.
机译：通过火花等离子体烧结（SPS）对使用不同起始粉末的WC-Co硬质合金进行了密纹处理。 WC-12 wt。的烧结周期在1240℃下进行。 Co-0.45重量％ WC-6 wt。％VC级和1280℃。钴含量为％，施加60 MPa的压力并结合100℃/ min的加热速率。研究了起始粉末的碳含量和均质性对最终微观结构和力学性能的影响。在碳含量略低的起始粉末的情况下，观察到较薄的渐变表面层。在从较低能量多方向混合的WC-Co粉末获得的SPS材料中观察到Co附聚物，而当使用具有可调碳平衡的磨碎机研磨或化学合成的WC-Co初始粉末时，获得了均匀的微观结构。观察到的微结构与测得的机械性能有关。

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