Polymer powder bed fusion surface texture measurement
Polymer powder bed fusion surface texture measurement
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DOI：
10.1088/1361-6501/ab63b1
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发表时间：
2020-05-01
影响因子：
2.4
通讯作者：
Leach, Richard
中科院分区：
文献类型：
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作者：
de Pastre, Marc-Antoine;Thompson, Adam;Leach, Richard
聚合物激光粉末床熔合（LPBF）表面的测量具有挑战性。这些表面包括复杂的特征，包括底切、深凹、台阶状过渡、大范围的测量尺度和不利的光学材料特性。虽然最近的研究已经开始研究这些表面的性质，但在理解不同的测量仪器如何与它们相互作用方面还没有做出重大努力。在本文中，我们使用一系列不同的仪器技术，包括触针，聚焦变化显微镜，相干扫描干涉术，激光扫描共聚焦显微镜和X射线计算机断层扫描的LPBF表面形貌测量的结果进行比较。在立方体聚酰胺-12 LPBF样品的侧面和顶面上进行测量。通过对表面重建的定性目视检查，突出显示了不同的仪器行为。进一步的比较，然后通过评估的轮廓和面积表面纹理参数和表面形貌的统计建模。这些分析允许识别纹理参数之间的差异和从测量重建的局部形貌之间的差异。还为测试表面的每次测量提供了仪器重复性指标。结果表明，在所获得的数据集上进行的测量的差异往往是相似的大小的表面上存在的功能。得出的结论是关于聚合物LPBF表面的各种表面测量仪器的适用性。
Polymer laser powder bed fusion (LPBF) surfaces can be challenging to measure. These surfaces comprise complex features including undercuts, deep recesses, step-like transitions, a large range of measurement scales and unfavourable optically materials properties. While recent research has begun to examine the nature of these surfaces, there has not yet been significant effort in understanding how different measurement instruments interact with them. In this paper, we compare the results of LPBF surface topography measurements using a series of different instrument technologies, including contact stylus, focus variation microscopy, coherence scanning interferometry, laser scanning confocal microscopy and x-ray computed tomography. Measurements are made on both side and top surfaces of a cubic polyamide-12 LPBF sample. Different instrument behaviours are highlighted through qualitative visual inspection of surface reconstructions. Further comparisons are then performed through evaluation of profile and areal surface texture parameters and statistical modelling of surface topographies. These analyses allow for the identification both of discrepancies between texture parameters and discrepancies between local topographies reconstructed from measurements. Instrument repeatability metrics are also presented for each measurement of the test surfaces. Results show that discrepancies in measurements made on the acquired datasets are often similar in magnitude to the size of the features present on the surfaces. Conclusions are drawn regarding the suitability of various surface measurement instruments for polymer LPBF surfaces.