研究目的
To reveal the bonding mechanism of laser action on poly-hollow Si3N4 microspheres by identifying phase constituent, chemistry composition and nanostructure of surface microvilli and nanowire, and to directly fabricate ultra-high porosity Si3N4 pre-sintered ceramics in the atmosphere by SLS.
研究成果
The study successfully revealed the bonding mechanism of SLSed Si3N4 under nonequilibrium heat source, characterized by unique microvilli structures. Ultra-high porosity Si3N4 pre-sintered ceramics were directly fabricated by SLS, demonstrating sufficient strength for post-treatment requirements.
研究不足
The study focuses on the bonding mechanism under instantaneous heat source, which may differ from equilibrium heat source conditions. The rapid cooling rate preserves high temperature phases and microstructures, but may also introduce unique challenges in controlling pore structure and phase composition.
