Influence of powder type and binder saturation on binder jet 3D–printed and sintered Inconel 625 samples
Influence of powder type and binder saturation on binder jet 3D–printed and sintered Inconel 625 samples
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DOI：
10.1007/s00170-021-07496-3
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发表时间：
2021-07
期刊：
影响因子：
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通讯作者：
R. Jiang;Lorenzo Monteil;Katerina Kimes;A. Mostafaei;M. Chmielus
中科院分区：
文献类型：
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作者：
R. Jiang;Lorenzo Monteil;Katerina Kimes;A. Mostafaei;M. Chmielus
粘结剂喷射3D打印与后沉积烧结相结合是一种非光束添加剂制造(AM)方法，用于创建复杂的三维结构。粘结剂饱和度和颗粒形态是影响印刷件质量的两个重要因素。在这里，我们研究了粘结剂饱和度对不同雾化粉末制备的镍基合金625样品的尺寸精度、孔隙率、显微组织和显微硬度的影响。用Ar气雾化(GA)和水雾化(WA)镍基合金625粉末作为粘结剂，对喷射样品进行了详细的对比研究。对于WA系统，最佳粘结剂饱和度为60~70%，而对于GA系统，最佳粘结剂饱和度约为80%。一般来说，在堆积密度、尺寸精度、烧结密度和显微硬度方面，GA样品的整体质量都好于WA样品。这一差异主要归因于颗粒的形态，包括球度和圆度。确定了WA型和GA型粘结剂渗漏现象的临界值分别为120%和140%。详细讨论了不同饱和度条件下，WA和GA体系粘结剂渗漏现象的机理。为了更好地理解印刷和烧结过程，提出了一个孔演化模型。
Binder jet 3D printing combined with post-deposition sintering is a non-beam additive manufacturing (AM) method for the creation of complex 3-dimensional structures. Binder saturation and particle morphology are two important factors affecting the quality of printed parts. Here, we investigated the effects of binder saturation on dimension accuracy, porosity, microstructure, and microhardness of nickel-based alloy 625 samples made of differently atomized powders. Argon gas atomized (GA) and water atomized (WA) nickel-based alloy 625 powders were used to binder jet samples for a detailed comparative study. The optimal binder saturation for WA system is 60 to 70%, whereas for GA system the optimal is about 80%. Generally, GA samples achieved better overall quality than WA samples in terms of packing density, dimensional accuracy, sintered density, and microhardness. This difference is attributed mainly to the particle morphology including sphericity and roundness. The critical threshold for visible binder bleeding phenomenon in WA and GA systems is determined to be 120% and 140% binder saturation, respectively. Mechanisms for binder bleeding phenomenon at different saturation levels for WA and GA systems are discussed in detail. A pore evolution model is proposed to better understand the printing and sintering processes.