Vat Photopolymerization-Based Additive Manufacturing of Si3N4 Ceramic Structures: Printing Optimization, Debinding/Sintering, and Applications

Materials, Journal Year: 2025, Volume and Issue: 18(7), P. 1556 - 1556

Published: March 29, 2025

Si3N4 ceramics and composites stand out for their exceptional mechanical thermal properties. Compared with conventional ceramic forming processes, 3D printing via vat photopolymerization not only ensures high geometric precision but also improves the efficiency strength of green body. Nevertheless, grayish appearance its relatively refractive index can adversely affect photocuring behavior in slurries. The primary objectives focus on enhancing curing performance rheological properties slurries, minimizing defects during post-processing, improving relative density ceramics. Key advancements include slurry optimization matching, biomodal particle gradation surface modification, while integration whisker/fiber additions or polymer-derived strategies enhances In addition, controlling atmosphere heating rate post-processing innovations achieve a more than 95%. This paper introduces mechanisms then summarizes slurries as well debinding/sintering processes. It further highlights ways which different approaches be used to enhance parts. Finally, applications various fields such aviation, aerospace, energy, electronics, chemical biomedical implants are presented point future opportunities challenges.

Language: Английский

Elastohydrodynamic analysis of multistep texture effects and partial surface roughness on the tribological performance of steel journal bearings

Deleted Journal, Journal Year: 2025, Volume and Issue: 7(4)

Published: April 3, 2025

Abstract Journal bearings are critical components designed to facilitate the smooth and consistent rotation of shafts around specific axes. To meet demands for efficient cost-effective applications in high-speed machinery, it is imperative enhance tribological performance journal bearings. This study investigates impact multistep texture geometry partial surface roughness on behavior fabricated from steel. Experimental analyses were performed using Newtonian fluids across varying rotational speeds evaluate interplay between material properties. further explore these dynamics, a three-dimensional computational fluid dynamics (CFD) model integrated with fluid–structure interaction (FSI) was employed, accounting effects cavitation deformation under elastohydrodynamic lubrication conditions. The also introduced partially rough boundary conditions bearings, hypothesizing their potential performance. Results demonstrate that significantly influence overall steel Additionally, variations speed found have pronounced effect efficiency. These findings provide valuable insights into optimizing bearing design high-performance applications.

Language: Английский