Modelling of metallic particle binders for increased part density in binder jet printed components
Modelling of metallic particle binders for increased part density in binder jet printed components
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金属颗粒粘合剂建模，以提高粘合剂喷射打印组件的部件密度
DOI：
10.1016/j.addma.2020.101244
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发表时间：
2020
影响因子：
11
通讯作者：
Roberts J
中科院分区：
文献类型：
--
作者：
Roberts J
粘结剂喷墨打印的部件在青态时总体密度低，热处理后收缩率和变形率高。先前已经证明，通过在粘合剂中加入相同材料的纳米颗粒，这些性能可以得到改善，因为纳米颗粒可以填充床颗粒之间的间隙和孔喉。使用这些添加剂粘结剂颗粒的有益效果可以通过最大化粘结剂粒度来改善，使粉末床内的空间能够以更高的填充效率填充。选择粘合剂的最大粒径需要详细了解粉末床颗粒之间的孔隙和孔喉。本文采用雨滴模型来确定粘结剂颗粒在孔隙之间通过并穿透床层的临界半径。通过氦气心理测量和粘结剂颗粒跌落试验对模型进行了验证。发现临界半径可以用粒子半径的均值和标准差的线性函数来预测，精度可以接受。为了推广具有不同平均粒径和粒径分布的粉末床的结果，采用了渗透理论的概念。这项工作的结果可以用来为粘合剂配方所需的粒度选择提供信息，以优化密度并减少印刷粘合剂射流组件的收缩。
Binder jet printed components typically have low overall density in the green state and high shrinkage and deformation after heat treatment. It has previously been demonstrated that, by including nanoparticles of the same material in the binder, these properties can be improved as the nanoparticles can fill the interstices and pore throats between the bed particles. The beneficial effects from using these additive binder particles can be improved by maximising the binder particle size, enabling the space within the powder bed to be filled with a higher packing efficiency. The selection of maximum particle size for a binder requires detailed knowledge of the pores and pore throats between the powder bed particles. In this paper, a raindrop model is used to determine the critical radius at which binder particles can pass between pores and penetrate the bed. The model is validated against helium psychometry measurements and binder particle drop tests. It is found that the critical radius can be predicted, with acceptable accuracy, using a linear function of the mean and standard deviation of the particle radii. Percolation theory concepts have been employed in order to generalise the results for powder beds that have different mean particle sizes and size distributions. The results of this work can be employed to inform the selection of particle sizes required for binder formulations, to optimise density and reduce shrinkage in printed binder jet components.
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DOI：
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发表时间：
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DOI：
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发表时间：
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期刊：
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影响因子：
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