Toughening Ceramic Joints through Strategic Fracture Path Control
Research output: Contribution to journal › Research article › Contributed › peer-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 language | English |
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Article number | 2400535 |
Number of pages | 6 |
Journal | Advanced materials technologies |
Issue number | 2400535 |
Publication status | Published - 12 Aug 2024 |
Peer-reviewed | Yes |
External IDs
ORCID | /0000-0002-7371-7892/work/165454346 |
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Scopus | 85201008314 |
Keywords
Keywords
- brazing, ceramics, fracture, laser machining, LEFM