Abstract
To alleviate resource shortage, reduce the cost of materials consumption and the pollution of agricultural and forestry waste, walnut shell composites (WSPC) consisting of walnut shell as additive and copolyester hot melt adhesive (Co-PES) as binder was developed as the feedstock of selective laser sintering (SLS). WSPC parts with different ingredient proportions were fabricated by SLS and processed through after-treatment technology. The density, mechanical properties and surface quality of WSPC parts before and after post processing were analyzed via formula method, mechanical test and scanning electron microscopy (SEM), respectively. Results show that, when the volume fraction of the walnut shell powder in the WSPC reaches the maximum (40%), sintered WSPC parts have the smallest warping deformation and the highest dimension precision, although the surface quality, density, and mechanical properties are low. However, performing permeating resin as the after-treatment technology could considerably increase the tensile, bending and impact strength by 496%, 464%, and 516%, respectively.
Highlights
Additive manufacturing (AM), commonly known as 3D Printing, is a technology combined with computer aided design, materials processing and molding
Before the selective laser sintering (SLS) of the Walnut shell composites composites (WSPC) powder with different ingredient proportions, the sintering window were determined via differential scanning calorimeter (DSC) to prevent them from warping deformation and hardening and improve the sintering performance of parts and the utilization ratio of powder
DSC curves of the WSPC powder with different ingredient proportions are shown in Figure 4, which shows that the glass transition temperatures of Co-PES powder (0% walnut shell powder), 7% walnut shell powder, 17% walnut shell powder and 40% walnut shell powder were 57.48, 58.15, 59.72 and 61.05 ◦ C, respectively
Summary
Additive manufacturing (AM), commonly known as 3D Printing, is a technology combined with computer aided design, materials processing and molding. Based on digital model file, software and control system, three-dimensional objects are fabricated by successive layers made by laser sintering, fused deposition modeling [1,2], stereolithography [3], three-dimensional printing [4] and hot-pressing [5]. Selective laser sintering (SLS) is one of 3D printing technologies, which was put forward by C. R. Deckard [6] in his doctoral thesis at the University of Texas at Austin in 1988. Compared with other 3D printing technologies, SLS has some advantages such as no support is needed during manufacturing, materials can be reused, and parts have high precision [7]. SLS has been widely applied in industries such as automobile making, medical treatment, casting, aerospace and construction [8,9]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
