Effect of layer thickness on crack suppression in laser engineered net shaping of ceramic structure
Laser engineered net shaping (LENS) has been innovatively applied to direct additive manufacturing of ceramics in recent years. Using this technique, neat ceramic powder without binders can be completely melted and solidified, obtaining compact and high-purity netshaped ceramic structures rapidly...
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| Main Authors: | , , , , |
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| Other Authors: | |
| Format: | Conference or Workshop Item |
| Language: | English |
| Published: |
2018
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/88720 http://hdl.handle.net/10220/45868 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | Laser engineered net shaping (LENS) has been innovatively applied to direct
additive manufacturing of ceramics in recent years. Using this technique, neat ceramic powder
without binders can be completely melted and solidified, obtaining compact and high-purity netshaped
ceramic structures rapidly. However, existing LENS process for fabricating ceramics
suffers from cracking defect due to intrinsic brittleness of ceramics and high temperature gradient
in deposition. Here we reported the effect of layer thickness on cracking in LENS of ceramic
structure, which indicates that cracks can be effectively suppressed by reasonably optimizing
process parameters. Pure Al2O3 structures with different layer thickness were fabricated by LENS
system and their microstructure were analyzed to figure out the crack suppressing mechanism of
optimizing layer thickness. Results indicate that cracks of fabricated specimen decreases obviously
with the increase of layer thickness. Reduction of grain boundary defects and increase of
transverse grain ratio are the main mechanism of crack suppression. |
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