Analysis and Optimization of Mechanical Properties of Laser-Sintered Cellulose/PLA Mixture

Materials

Hui Zhang¹  Yanling Guo¹  DavidL. Bourell² 

[1] College of Mechanical and Electrical Engineering, Northeast Forestry University, Harbin 150040, China;Department of Mechanical Engineering, The University of Texas at Austin, Austin, TX 78712, USA;

关键词: cellulose/PLA mixture;    laser sintering;    process parameter optimization;    thermal post-processing;    mechanical properties;   

DOI  :  10.3390/ma14040750

来源: DOAJ

【 摘 要 】

This studied aimed at improving the mechanical properties for a new biopolymer feedstock using laser-sintering technology, especially when its laser-sintered parts are intended to be applied in the industrial and medical fields. Process parameter optimization and thermal post-processing are two approaches proposed in this work to improve the mechanical properties of laser-sintered 10 wt % cellulose-polylactic acid (10%-CPLA) parts. Laser-sintering experiments using 2³ full factorial design method were conducted to assess the effects of process parameters on parts’ mechanical properties. A simulation of laser-energy distribution was carried out using Matlab to evaluate the experimental results. The characterization of mechanical properties, crystallinity, microstructure, and porosity of laser-sintered 10%-CPLA parts after thermal post-processing of different annealing temperatures was performed to analyze the influence of thermal post-processing on part properties. Image analysis of fracture surfaces was used to obtain the porosity of laser-sintered 10%-CPLA parts. Results showed that the optimized process parameters for mechanical properties of laser-sintered 10%-CPLA parts were laser power 27 W, scan speed 1600 mm/s, and scan spacing 0.1 mm. Thermal post-processing at 110 °C produced best properties for laser-sintered 10%-CPLA parts.

【 授权许可】

Unknown