Abstract
Agricultural and forestry wastes are used as materials for selective laser sintering (SLS) to alleviate resource shortage, reduce the pollution of the environment, lower the cost of materials, and improve the accuracy of parts produced by SLS. However, the mechanical properties of wood–plastic parts are poor, and thus they cannot be applied widely. In order to improve the mechanical properties of wood–plastic parts, a new type of walnut shell polymer composite (WSPC) was prepared by a polymer mixing method and was used to produce parts via SLS. Additionally, the dimensional accuracy, morphologies, density, and mechanical properties of the WSPC parts were studied. The results showed that the addition of a small amount of copolyamide (Co-PA) powder could effectively improve the mechanical properties and decrease the density of the WSPC parts. By increasing the amount of Co-PA powder and decreasing that of copolyester (Co-PES) powder, the mechanical properties first increased, then decreased, and finally increased again; in addition, the density first decreased then increased. By increasing the preheating temperature, the mechanical properties and density of the WSPC parts were enhanced.
Highlights
Three-dimensional printing (3D printing), commonly known as additive manufacturing (AM) or rapid prototyping (RP), is an advanced manufacturing technology
On the basis of 3D digital model files and by using materials for selective laser sintering (SLS) mainly consisting of metals, ceramics, polymers, and their corresponding composites, 3D entities re fabricated by repeatedly depositing thin layers [1]
In the process of SLS, the walnut shell powder used as a filler cannot melt and is considered the skeleton of the material; the Co-PES powder and Co-PA powder are considered the matrix of the material, as they can be melted by laser beam, forming a liquid phase, and wrap the walnut shell powder
Summary
Three-dimensional printing (3D printing), commonly known as additive manufacturing (AM) or rapid prototyping (RP), is an advanced manufacturing technology. On the basis of 3D digital model files and by using materials for selective laser sintering (SLS) mainly consisting of metals, ceramics, polymers, and their corresponding composites, 3D entities re fabricated by repeatedly depositing thin layers [1]. This technology mainly includes stereo lithography appearance (SLA), fused deposition modeling (FDM), SLS, laminated object manufacturing (LOM), and polyjet (PJ) [2]. SLS is a 3D printing technique which was introduced by Deckard [3]. SLS has been widely applied in various industries, such as automobile manufacturing, aerospace, casting, and medical industries [4,5,6,7]
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