Melting process and mechanics on laser sintering of single layer polyamide 6 powder

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[1] Zhou, Wenxiao
[2] Wang, Xiang
[3] Hu, Jiangbo
[4] Zhu, Xuelin
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Wang, X. (wxyf@ustc.edu.cn) | 1600年 / Springer London卷 / 69期
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In this paper; polyamide 6 single layer laser sintering process was investigated. A moving volumetric heat source model that involves the energy function morphology was simulated; and the temperature field distribution of a single layer of polyamide 6 powder was investigated using the finite element method; with different scan space and preheating temperature. The sintering processes were conducted on several batch of single layer with original thickness of 0.5 mm; which consists of 80 mesh polyamide 6 powders. Then the percentage of porosity was calculated and tensile stress of was tested. The results indicate that the scanning space strongly affect the percentage of porosity. For example; the percentage of porosity reaches 45.1 % when the scanning space increases from 0.25 to 0.45 mm. The results also indicate that the preheating and holding temperature strongly affect the mechanical properties. For example; the max tensile test stress increased from 2.04 to 4.10 MPa when the temperature rises from 50 to 150 C; while the percentage of porosity shows very limited shift; reducing by only 9.54 %. © 2013 Springer-Verlag London;
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