Two-step forging of polyimide powders into small-/medium-sized gears with and without carbon fiber reinforcement

Two-step forging of polyimide powders into small-/medium-sized gears with and without carbon fiber reinforcement

AIZAWA Tatsuhiko, MIYATA Tomohiro, ENDO Kiyoyuki

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Abstract. A green polyimide cylindrical preform with short carbon fibers was prepared for two-step forging processes. Each preform was hot-forged at 623 K above the glass transition temperature of polyimide for near-net shaping of fifteen-teeth module-1.0 gear, and sinter-forged at 673 K below its melting point for densification. SEM and X-ray computer tomography were employed to make destructive and non-destructive diagnoses on the carbon fiber orientation during hot forging. Micro-hardness testing and gear-grade balancing were utilized to evaluate the engineering durability and dimensional accuracy of sinter-forged gears.

Polyimide Powder Feed Stock, Green Preform, Sinter-Forging, Carbon Reinforcement

Published online 4/24/2024, 10 pages
Copyright © 2024 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA

Citation: AIZAWA Tatsuhiko, MIYATA Tomohiro, ENDO Kiyoyuki, Two-step forging of polyimide powders into small-/medium-sized gears with and without carbon fiber reinforcement, Materials Research Proceedings, Vol. 41, pp 2648-2657, 2024


The article was published as article 290 of the book Material Forming

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