Journal
SCRIPTA MATERIALIA
Volume 173, Issue -, Pages 91-95Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2019.07.046
Keywords
Additive manufacturing; Selective laser sintering; Silicon nitride; Bonding mechanism; Nanostructure
Categories
Funding
- National Natural Science Foundation of China [51805187]
- China Postdoctoral Science Foundation [2019T120654, 2016M602290]
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Complex structural Si3N4 ceramics with ultra-high porosity were innovatively formed by selective laser sintering (SLS) technology without any binder. Due to rapid cooling rate, the high temperature phase constituent and microstructure of the SLSed Si3N4 poly hollow microspheres (PHMS) were preserved, thus revealing the bonding mechanism of Si3N4 under the nonequilibrium heat source. Si3N4 PHMS are bonded by microvilli composed of bamboo-structure SiO2 nanofiber clusters, stacked SiO2 nanospheres and smooth alpha-Si3.72N4 nanowires. Finally, the pre-sintered Si3N4 ceramics with a porosity of 80% are directly fabricated in the atmosphere by SLS, which have the enough strength to satisfy the post-treatment requirements. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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