Influence of laser surface texturing on the flexural strength of Al2O3 and Si3N4. Issue 10 (August 2022)

• Record Type: Journal Article
• Authors: Liu, Chao; Herzog, Simone; Deng, Yuanbin; Kaletsch, Anke; Oster, Philip; Broeckmann, Christoph
• Is Part Of: Journal of the European Ceramic Society. Volume 42:Issue 10(2022)
• Page Start: 4286
• Page End: 4295
• Publication Date: 2022-08
• Subjects: Laser surface texturing -- Ball-on-3-balls (B3B) test -- Weibull statistics -- Residual stress -- Size effect; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2022.04.013
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: Laser surface texturing (LST) is well known to be capable of improving the tribological performance and reducing the friction of ceramic surfaces. However, the influence of LST on the flexural strength of ceramics has rarely been researched. In this study, we examine the influence of LST on high purity (> 99.5 wt%) dense-sintered fine Al2 O3 and hot-pressed fine Si3 N4 with polished and laser-textured surfaces based on the biaxial ball-on-3-balls (B3B) test. A heat transfer simulation of the LST process is performed to understand the occurrence of residual stress. In addition, the B3B strength of Al2 O3 and Si3 N4 texture groups is calculated by adapting the previous formula based on the finite element (FE) simulation. Subsequently, the stress distribution in the FE simulation is used to calculate the effective volume and effective surface to study the size effect on both ceramics. It is found that LST improves the strength of Al2 O3 and Si3 N4 due to two reasons: it induces compressive residual stress on the tensile-loaded surface of ceramic specimens; more importantly, it reduces the effective volume and effective surface remarkably, thus improving the component strength significantly.