Optimization of penetration depth and powder layer thickness for proper interlayer adhesion in polymer laser sintering

Date

2022

Authors

Yamauchi, Yuki
Kigure, Takashi
Niino, Toshiki

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Abstract

In laser sintering, the melt pool depth relative to the powder layer thickness is the main factor influencing interlayer adhesion strength. The melt pool depth is closely related to the amount of laser energy and its penetration depth. Previous studies have shown that using a near-infrared laser and an additive agent that absorbs its light allows for a wide range of penetration depth control. This research focuses on the optimization of the powder layer thickness and penetration depth to achieve appropriate interlayer adhesion. To determine the optimal amount of laser energy, the relationship between the amount of laser energy and part density for each layer pitch and penetration depth was determined. The relationship between the amount of energy supplied normalized by the penetration depth and part density was consistent regardless of the penetration depth of the powder material. The adhesion strength of specimens prepared using different optimal amounts of energy to maximize part density was evaluated. Based on this evaluation, layer thickness normalized by penetration depth is the dominant factor influencing interlayer adhesion strength.

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