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Improvements in Brazed-Joint Properties of Silicon Nitride and Titanium Alloys Using Laser-Induced Microscale Rice
Jian-Guo He1,2,3, Shou-Jun Dai1,3, Yang Zhao4
1Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China.
Materials (Basel, Switzerland)
|October 14, 2022
Summary
Silicon nitride (Si3N4) ceramics with a microscale rice leaf structure (MRLS) were brazed to titanium alloy. The MRLS surface enhanced interfacial bonding and mechanical interlocking, significantly increasing joint strength and hindering crack propagation.
Area of Science:
- Materials Science
- Ceramics Engineering
- Surface Engineering
Background:
- Joining dissimilar materials like silicon nitride (Si3N4) ceramics and titanium alloys presents significant challenges.
- Surface microstructure modification is crucial for improving interfacial properties and bond strength.
Purpose of the Study:
- To investigate the effect of a microscale rice leaf structure (MRLS) on the brazed joint between Si3N4 ceramics and titanium alloy.
- To analyze how surface morphology and wettability influence the connection quality.
Main Methods:
- Fabrication of MRLS on Si3N4 ceramics using laser treatment at specific power and line spacing.
- Brazing of MRLS-modified Si3N4 ceramics to titanium alloy.
- Microstructural analysis of the brazed interface.
- Finite element analysis to study fracture morphology and stress distribution.
Main Results:
- The MRLS surface exhibited a coral-like structure with nanoparticles and microparticles.
- Excellent brazed joint formation with no defects was achieved using the MRLS.
- The MRLS enhanced mechanical occlusion and bonding area, while inducing compressive stress on the Si3N4 side.
- Crack propagation was effectively hindered, leading to increased joint strength.
Conclusions:
- The MRLS is an effective surface modification strategy for improving the brazing of Si3N4 ceramics to titanium alloys.
- The enhanced interfacial properties and stress distribution contribute to superior joint strength and fracture resistance.
