Dynamic evolution simulation of sintering pool in selective laser sintering walnut shell/Co-PES composite

2021 ◽  
Vol 144 ◽  
pp. 107425
Author(s):  
Yueqiang Yu ◽  
Minzheng Jiang ◽  
Suling Wang ◽  
Yanling Guo ◽  
Ting Jiang ◽  
...  
Keyword(s):  
Selective Laser Sintering ◽  
Laser Sintering ◽  
Walnut Shell ◽  
Dynamic Evolution ◽  
Evolution Simulation

scholarly journals Study on the Characteristics of Walnut Shell/Co-PES/Co-PA Powder Produced by Selective Laser Sintering

Materials ◽  
2018 ◽  
Vol 11 (5) ◽  
pp. 784 ◽  
Author(s):  
Yueqiang Yu ◽  
Yanling Guo ◽  
Ting Jiang ◽  
Jian Li ◽  
Kaiyi Jiang ◽  
...  
Keyword(s):  
Selective Laser Sintering ◽  
Laser Sintering ◽  
Walnut Shell

scholarly journals Impact of Particle Size on Performance of Selective Laser Sintering Walnut Shell/Co-PES Powder

Materials ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 448
Author(s):  
Yueqiang Yu ◽  
Minzheng Jiang ◽  
Suling Wang ◽  
Yanling Guo ◽  
Ting Jiang ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Particle Size ◽  
Powder Particle ◽  
Mechanical Test ◽  
Selective Laser Sintering ◽  
Particle Diameter ◽  
Laser Sintering ◽  
Walnut Shell ◽  
Powder Particle Size ◽  
Shell Powder

The agricultural and forestry waste walnut shell and copolyester hot-melt adhesives (Co-PES) powder were selected as feedstock. A kind of low-cost, low-power consumption, and environmentally friendly walnut shell/Co-PES powder composites (WSPC) was used for selective laser sintering (SLS). Though analyzing the size and morphology of walnut shell particle (≤550 μm) as well as performing an analysis of surface roughness, density, and mechanical test of WSPC parts with different particle sizes, results showed that the optimal mechanical performance (tensile strength of 2.011 MPa, bending strength of 3.5 MPa, impact strength of 0.718 KJ/m2) as walnut shell powder particle size was 80 to 120 μm. When walnut shell powder particle diameter was 120 to 180 μm, the minimum value of surface roughness of WSPC parts was 15.711 μm and density was approximately the maximum (0.926 g/cm3).

scholarly journals Production and Processing of a Spherical Polybutylene Terephthalate Powder for Laser Sintering

2019 ◽  
Vol 9 (7) ◽  
pp. 1308 ◽  
Author(s):  
Rob Kleijnen ◽  
Manfred Schmid ◽  
Konrad Wegener
Keyword(s):  
Mechanical Properties ◽  
Thermal Processing ◽  
Selective Laser Sintering ◽  
Spherical Shape ◽  
Laser Sintering ◽  
Polybutylene Terephthalate ◽  
Powder Production ◽  
Injection Molded ◽  
Continuous Extrusion ◽  
Matrix Powder

This work describes the production of a spherical polybutylene terephthalate (PBT) powder and its processing with selective laser sintering (SLS). The powder was produced via melt emulsification, a continuous extrusion-based process. PBT was melt blended with polyethylene glycol (PEG), creating an emulsion of spherical PBT droplets in a PEG matrix. Powder could be extracted after dissolving the PEG matrix phase in water. The extrusion settings were adjusted to optimize the size and yield of PBT particles. After classification, 79 vol. % of particles fell within a range of 10–100 µm. Owing to its spherical shape, the powder exhibited excellent flowability and packing properties. After powder production, the width of the thermal processing (sintering) window was reduced by 7.6 °C. Processing of the powder on a laser sintering machine was only possible with difficulties. The parts exhibited mechanical properties inferior to injection-molded specimens. The main reason lied in the PBT being prone to thermal degradation and hydrolysis during the powder production process. Melt emulsification in general is a process well suited to produce a large variety of SLS powders with exceptional flowability.

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