Synthesis and Characterization of Mechanical Behavior and Thermal Shock Resistance of Macro-Porous SiC Solar Absorber

Authors

Department of Materials Engineering, Isfahan University of Technology, Isfahan, Iran, 8415683111.

Abstract

The concentrated solar power (CSP) is one of the renewable energy sources in which solar irradiation heat energy will be used in a steam turbine to generate electrical grid. Solar radiation is absorbed by a solar receiver reactor on the surface of a porous solar absorber. In this survey, synthesis and mechanical/thermal characterization of micro-porous silicon carbide (SiC) absorber to be used in solar reactor is carried out. SiC foams were synthesized and categorized based on three different pore sizes i.e. 5, 12 and 75 ppi. Mechanical behavior and thermal shock resistance of porous foams in the working temperature range for absorber (25-1200 °C) were evaluated. Results revealed that the specific compressive strength (σc/ρ) of foams increase exponentially by a decrement in the porosity percentage and the average pore size. Moreover, for foams with smaller pore size, a considerable decrease in mechanical strength due to thermal shock was observed. This could be due to increase in the number of struts per unit volume i.e. more weak struts to withstand the mechanical loading. So, porous foams with coarser pore sizes were distinguished to be more capable of tolerating thermal shock while serving as solar absorbers.

Keywords

References

1. ASTM, Standard Test Methods of Compression Testing of Metallic Materials at Room Temperature, In E09-09, 2009.
2. Seeber, B. S. M., Gonzenbach U. T., and Gauckler L. J., “Mechanical Properties of Highly Porous Alumina Foams”, Journal of Materials Research, Vol. 28, No. 17, pp. 2281-2287, 2013.
3. Dam, C. Q., Brezny, R., and Green, D. J., “Compressive Behavior and Deformation-Mode Map of an Open Cell Alumina”, Journal of Materials Research, Vol. 5, No. 1, pp. 163-171, 1990.
4. Munz, D., and Fett, T., Ceramics: Mechanical Properties, Failure Behaviour, Materials Selection, Vol. 36, Springer Science & Business Media, 2013.
5. Reilly, D. T., and Burstein, A. H., “The Mechanical Properties of Cortical Bone”, Journal of Bone and Joint Surgery, Vol. 56, No. 5, pp. 1001-1022, 1974.
6. Zhao, K., “Porous Hydroxyapatite Ceramics by Ice Templating: Freezing Characteristics and Mechanical Properties”, Ceramics International, Vol. 37, No. 2, pp. 635-639, 2011.
7. Lian, C., Zhuge Y., and Beecham S., “The Relationship Between Porosity and Strength for Porous Concrete”, Construction and Building Materials, Vol. 25, No. 11, pp. 4294-4298, 2011.
8. Li, Y., “Effect of V2O5 Addition on the Properties of Reaction-Bonded Porous SiC Ceramics”, Ceramics International, Vol. 40, No. 10, Part B, pp. 16581-16587, 2014.
9. Rice, R. W., “Comparison of Stress Concentration Versus Minimum Solid Area Based Mechanical Property-Porosity Relations”, Journal of Materials Science, Vol. 28, No. 8, pp. 2187-2190, 1993.
10. Ashby, M. F., and Medalist, R. F. M., “The Mechanical Properties of Cellular Solids”, Metallurgical Transactions A, Vol. 14, No. 9, pp. 1755-1769, 1983.
11. Gibson, L. J., and Ashby, M. F., Cellular Solids: Structure and Properties, Cambridge University Press, 1999.
12. Gibson, L. J., and Ashby, M. F., “The Mechanics of Three-Dimensional Cellular Materials”, Proceedings of the Royal Society of London A: Mathematical, Physical and Engineering Sciences, 1982.
13. Ryshkewitch, E., “Compression Strength of Porous Sintered Alumina and Zirconia”, Journal of the American Ceramic Society, Vol. 36, No. 2, pp. 65-68, 1953.
14. Eom, J. -H., Kim, Y. -W., and Raju, S., “Processing and Properties of Macroporous Silicon Carbide Ceramics: A Review”, Journal of Asian Ceramic Societies, Vol. 1, No. 3, pp. 220-242, 2013.
15. Seuba, J., “Mechanical Properties and Failure Behavior of Unidirectional Porous Ceramics”, Scientific Reports, Vol. 6, p. 24326, 2016.
16. Vedula, V. R., Green, D. J., and Hellman, J. R., “Thermal Shock Resistance of Ceramic Foams”, Journal of the American Ceramic Society, Vol. 82, No. 3, pp. 649-656, 1999.
17. Brezny, R., and Green, D. J., “The Effect of Cell Size on the Mechanical Behavior of Cellular Materials”, Acta Metallurgica et Materialia, Vol. 38, No. 12, pp. 2517-2526, 1990.
18. Lichtner, A., “Effect of Macropore Anisotropy on the Mechanical Response of Hierarchically Porous Ceramics”, Journal of the American Ceramic Society, Vol. 99, No. 3, pp. 979-987, 2016.
19. Scheffler, M., and Colombo, P., Cellular Ceramics: Structure, Manufacturing, Properties and Applications, John Wiley & Sons, 2006.
20. She, J., Ohji, T., and Deng, Z. Y., “Thermal Shock Behavior of Porous Silicon Carbide Ceramics”, Journal of the American Ceramic Society, Vol. 85, No. 8, pp. 2125-2127, 2002.
21. Ding, S., Zeng, Y. -P., and Jiang, D., “Thermal Shock Behaviour of Mullite-Bonded Porous Silicon Carbide Ceramics with Yttria Addition”, Journal of Physics D: Applied Physics, Vol. 40, No. 7, p. 2138, 2007.
Journal of Advanced Materials in Engineering (Esteghlal)
Volume 38, Issue 4
January 2020
Pages 87-101

Files

Share

How to cite

Statistics

ارتقاء امنیت وب با وف ایرانی