Role of powder morphology in liquid phase sintering of binder jet additively fabricated WC–Co composite

IF 10.3 1区工程技术 Q1 ENGINEERING, MANUFACTURING

Additive manufacturing Pub Date : 2024-09-05 DOI:10.1016/j.addma.2024.104520

K.N. Chaithanya Kumar , Mohan Sai Ramalingam , Sameehan S. Joshi , Shashank Sharma , Narendra B. Dahotre

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引用次数: 0

Abstract

The present study explored the computational analysis of capillary forces and capillary pressure experienced by the liquid present between particles of various morphologies during liquid phase sintering of a binder jet additively fabricated WC–10 wt% Co composite. An integrated two-particle computational approach was adopted for morphologies gradually transitioning from spherical to cubical. The capillary forces depended on factors such as curvature of liquid meniscus, volume of liquid present between two neighboring particles, and changes in solid–liquid and liquid–vapor contact areas, which were influenced by the particle morphology. The results indicated that capillary forces increased as particle morphology changed from spherical to non-spherical, while increased particle separation led to a reduction in capillary force. Despite increased particle separation, the overall trend in effect of particle morphology on capillary force remained consistent. Additionally, a probability density function based on Rayleigh distribution was used to represent particle separation distances in a real system and variations in coordination number due to different particle morphologies and separation distances were considered. This model allowed estimation of overall effect of particle morphology on capillary force and capillary pressure in realistic systems. The model-based predictions confirmed the experimental observations of severely limited sintering in binder jet additively fabricated WC–10 wt% Co composite containing spherical particles compared to that containing the particles of irregular morphologies. This study provides valuable insights into the mechanics of capillary forces, capillary pressure, and their role in liquid phase sintering, with potential applications in the design and optimization of components of any material system produced using any additive manufacturing process involving liquid phase sintering.

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粉末形貌在粘合剂喷射添加法制造的 WC-Co 复合材料液相烧结中的作用

本研究探讨了在液相烧结粘合剂喷射添加剂制造的 WC-10 wt% Co 复合材料过程中，不同形态的颗粒之间的液体所经历的毛细力和毛细管压力的计算分析。对于从球形逐渐过渡到立方体的形态，采用了一种综合的双颗粒计算方法。毛细力取决于液体半月板的曲率、两个相邻颗粒之间的液体体积以及固液接触面积和液汽接触面积的变化等因素，而这些因素都受到颗粒形态的影响。结果表明，当颗粒形态从球形变为非球形时，毛细管力增大，而颗粒分离度增大则导致毛细管力减小。尽管颗粒分离度增加，但颗粒形态对毛细管力影响的总体趋势保持一致。此外，还使用了基于瑞利分布的概率密度函数来表示实际系统中的颗粒分离距离，并考虑了不同颗粒形态和分离距离导致的配位数变化。通过该模型，可以估算出颗粒形态对实际系统中毛细管力和毛细管压力的总体影响。基于模型的预测结果证实了实验观察结果，即在粘结剂喷射加成法制造的 WC-10 wt% Co 复合材料中，与含有不规则形态颗粒的复合材料相比，含有球形颗粒的复合材料的烧结受到严重限制。这项研究为毛细力力学、毛细管压力及其在液相烧结中的作用提供了宝贵的见解，有望应用于使用任何涉及液相烧结的增材制造工艺生产的任何材料系统部件的设计和优化。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Additive manufacturing Materials Science-General Materials Science

CiteScore

19.80

自引率

12.70%

发文量

648

审稿时长

35 days

期刊介绍： Additive Manufacturing stands as a peer-reviewed journal dedicated to delivering high-quality research papers and reviews in the field of additive manufacturing, serving both academia and industry leaders. The journal's objective is to recognize the innovative essence of additive manufacturing and its diverse applications, providing a comprehensive overview of current developments and future prospects. The transformative potential of additive manufacturing technologies in product design and manufacturing is poised to disrupt traditional approaches. In response to this paradigm shift, a distinctive and comprehensive publication outlet was essential. Additive Manufacturing fulfills this need, offering a platform for engineers, materials scientists, and practitioners across academia and various industries to document and share innovations in these evolving technologies.