Laser Additive Manufacturing of Bulk Silicon Nitride Ceramic: Modeling versus Integral Transform Technique with Experimental Correlation
Abstract
:1. Introduction
2. Mathematical Model
3. Methodology and Simulations
4. Results and Discussion
5. Conclusions
- The thermal field value increases rapidly at the irradiation site due to the heat propagation with an infinite speed (Fourier equation). The thermal conductivity in ceramics stays lower compared to metals, thereby limiting the heat expansion within the surrounding zones resulting in heat accumulation and a very high temperature rise.
- A correlation was shown between the laser scanning speed and thermal distribution intensity. Thus, whenever the laser scanning speed increases, less photons interact and transfer energy to the sample, resulting in a lower thermal distribution intensity.
- In laser additive manufacturing of ceramics, the laser beam energy absorption is split via surface or during propagation trough bulk, respectively. This depends on surface morphology, crystalline status, and processing history.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Parameter Name | Value (Units) |
---|---|
Density | 3200 (kg/m3) |
Room temperature | 25 (°C) |
Specific heat | 900 (J/kg-K) |
Thermal conductivity | 15 (W/mK) |
Laser absorption coefficient | 0.90 |
Laser beam spot diameter | 3.0 (mm) |
Emissivity | 0.40 |
Laser wavelength | 1.075 (µm) |
Type of laser | Continuous wave Fiber laser |
Laser Power (W) | Laser Scanning Speed (mm/min) | Maximum Temperature in the Case of Current Simulation (°C) | Maximum Temperature in the Case of FE Simulation [15] (°C) | Maximum Temperature in Experiments [15] (°C) |
---|---|---|---|---|
143.25 | 100 | 2245 | 2236 | 2269 |
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Mihailescu, C.N.; Oane, M.; Sava, B.A.; Popescu, A.C.; Elisa, M.; Mahmood, M.A.; Mihailescu, N.; Filip, A.V.; Anghel, S.A.; Mihailescu, I.N.; et al. Laser Additive Manufacturing of Bulk Silicon Nitride Ceramic: Modeling versus Integral Transform Technique with Experimental Correlation. Crystals 2022, 12, 1155. https://doi.org/10.3390/cryst12081155
Mihailescu CN, Oane M, Sava BA, Popescu AC, Elisa M, Mahmood MA, Mihailescu N, Filip AV, Anghel SA, Mihailescu IN, et al. Laser Additive Manufacturing of Bulk Silicon Nitride Ceramic: Modeling versus Integral Transform Technique with Experimental Correlation. Crystals. 2022; 12(8):1155. https://doi.org/10.3390/cryst12081155
Chicago/Turabian StyleMihailescu, Cristian N., Mihai Oane, Bogdan A. Sava, Andrei C. Popescu, Mihail Elisa, Muhammad Arif Mahmood, Natalia Mihailescu, Ana V. Filip, Sinziana Andreea Anghel, Ion N. Mihailescu, and et al. 2022. "Laser Additive Manufacturing of Bulk Silicon Nitride Ceramic: Modeling versus Integral Transform Technique with Experimental Correlation" Crystals 12, no. 8: 1155. https://doi.org/10.3390/cryst12081155