1 College of Mechanical and Electrical Engineering, Northeast Forestry University, Harbin 150040, China 2 School of Engineering and Technology, Northeast Forestry University, Harbin 150040, China
Abstract: Selective laser sintering technology has been widely used in biomedical field, but due to the limitations of the feedstock, most of SLS products are made of synthetic plastics, ceramics, alloys, and so on. And developing flexible material for laser selective sintering is a pressing need for the present. In this work, polyurethane (TPU) powder was used as the main material, and a composite that can be used for selective laser sintering was studied and prepared. The sintered parts have high strength and forming precision, which can be used to make flexible medical models such as blood vessels. First, the laser sintering experiment of TPU/PS (Polystyrene) powder was performed through the orthogonal experiment method. After testing, it obtained the effect of the process parameters on the strength, precision and sintering density. Secondly, the TPU/PS composites of different mass fractions were sintered to obtain tensile and bending specimens. Through the dimension measurement, the mechanical testing and the microstructure observation by scanning electron microscope, the effects of different component proportion on the microstructure, tensile strength and bending strength of the sintered pieces were obtained, and the optimized component ratio of the flexible material was determined.
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2020, Vol. 34 
