Toughening Ceramic Joints through Strategic Fracture Path Control

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

Abstract

Ceramic-on-ceramic joints are notorious for their inherent brittleness, posing challenges for high-performance applications. To address this, a novel approach is proposed to enhance the involvement of filler metals during fracture. This study investigates the controlled initiation and propagation of cracks in Al2O3–Al2O3 joints through a strategic combination of laser pre-cracking, laser patterning, and laser active brazing techniques. By introducing pre-cracking and African daisy-like patterning, crack propagation dynamics are altered, with cracks initially confined within pre-crack regions before navigating through pattern intrusions. Additionally, laser active brazing effectively managed titanium diffusion, optimizing interface strength control. Evaluation via SEVNB tests demonstrated a significant enhancement in fracture toughness, achieving maximal 25.6 ± 4.6 MPa·m0.5 compared to ≈3–5 MPa·m0.5 for alumina ribbons. This integrated approach offers precise control over fracture paths, thereby augmenting the performance of ceramic-on-ceramic joints, and holds promise for advancing their applications in demanding environments.

Details

Original languageEnglish
Article number2400535
Number of pages6
JournalAdvanced materials technologies
Volume10
Issue number1
Early online date12 Aug 2024
Publication statusPublished - 8 Jan 2025
Peer-reviewedYes

External IDs

ORCID /0000-0002-7371-7892/work/165454346
Scopus 85201008314

Keywords

Keywords

  • brazing, ceramics, fracture, laser machining, LEFM