研究目的
Investigating the use of cellulose nanofiber (CellNF) as a carbon source for selective laser sintering (SLS) of Al2O3 to improve laser absorption and sintering properties.
研究成果
The study demonstrated that 1.5 wt% CR-Al2O3 composite particles heat-treated at 800°C with alumina size of 0.8 μm exhibited optimal laser sintering properties due to better CR distribution and coverage on alumina surface, improving laser absorption and heat transfer.
研究不足
The study is limited to the use of CellNF as a carbon source and its conversion to CR at specific temperatures. The mechanism behind the formation of dome-like CR structures at higher temperatures is not fully understood.
1：Experimental Design and Method Selection:
The study used electrostatic adsorption (EA) method in aqueous suspension to fabricate CellNF and Al2O3 composite powder. Heat-treatment at 500 and 800°C was compared for the conversion of CellNF to carbon residue (CR).
2：Sample Selection and Data Sources:
Alumina particles and CellNF were used as starting materials. The effect of CR volume fraction and Al2O3 particle size was investigated.
3：List of Experimental Equipment and Materials:
Alumina particles (AA-3, AA-1.5, AA-07), CellNF (Rheocrysta), polyelectrolytes (PDDA, PSS), thermogravimetric analyzer, Raman spectrophotometer, UV-Vis-NIR spectrophotometer, FE-SEM.
4：5, AA-07), CellNF (Rheocrysta), polyelectrolytes (PDDA, PSS), thermogravimetric analyzer, Raman spectrophotometer, UV-Vis-NIR spectrophotometer, FE-SEM. Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Composite powders were prepared, heat-treated, pressed into pellets, and laser-irradiated. Characterization was performed using Raman, UV-Vis-NIR, and SEM.
5：Data Analysis Methods:
The effect of heat treatment temperature, CR volume fraction, and alumina particle size on laser sintering was analyzed.
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Thermogravimetric analyzer
Thermo plus EVO2 TG 8121
Rigaku Corporation
Used for thermogravimetric analysis.
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Raman spectrophotometer
NRS-3100
JASCO Corporation
Used to investigate the carbonization of CellNF.
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UV-Vis-NIR spectrophotometer
V-670
JASCO Corporation
Used to obtain UV-Vis-NIR spectra.
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Alumina particles
AA-3, AA-1.5, AA-07
Sumitomo Chemical Co., Ltd.
Used as matrix material in the composite.
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Cellulose nanofiber
Rheocrysta
DKS Co. Ltd.
Used as a carbon source in the composite.
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Polydiallyldimethyl ammoniumchloride
PDDA
Used as polycation in the electrostatic adsorption process.
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Polysodium styrenesulfonate
PSS
Used as polyanion in the electrostatic adsorption process.
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FE-SEM
S-4800
Hitachi High-Technologies Corporation
Used for observing the laser irradiated area of the samples.
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Direct diode laser
ML-5120A
AMADA MIYACHI CO., LTD.
Used for laser irradiation.
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