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J. Korean Ceram. Soc. > Volume 57(5); 2020 > Article
Journal of the Korean Ceramic Society 2020;57(5): 503-512.
doi: https://doi.org/10.1007/s43207-020-00052-x
Effect of heat‑treatment temperature on mechanical properties and microstructure of alumina–SiC nanocomposite
Amir Fathi1 , Hamidreza Baharvandi2
1Material Engineering Department, Technical and Vocational University, Mianeh, Iran
2Material Engineering Department, Maleke Ashtar University of Technology, Tehran, Iran
Correspondence  Amir Fathi ,Email: a‑fathi@tvu.ac.ir
Hamidreza Baharvandi ,Email: baharvandee@yahoo.com
Received: October 26, 2019; Revised: January 20, 2020   Accepted: January 27, 2020.  Published online: September 30, 2020.
ABSTRACT
In this investigation, 90 vol. % alumina and 10 vol. % silicon carbide nanopowders were combined. Initial samples were fabricated by the hot press method under 20-MPa pressure of 1650 °C. Then, the nanocomposites were heat-treated at 1200, 1400, 1500, and 1600 °C for several hours. After the heat-treatment, XRD (X-ray diffraction), SEM (scanning electron microscope), and FE-SEM (field emission scanning electron microscope) analyses were used to explore the nanocomposite specifications and microstructure. The flexural strength, apparent density, crack healing, and fracture toughness were measured to study the physical and mechanical properties of nanocomposite specimens. The best result for flexural strength was achieved for specimens heat-treated at 1500 °C for 2 h, exhibiting a 34% increase in the flexural strength. Furthermore, with heat-treatment at 1600 °C for 2 h, the fracture toughness for nanocomposite reached 5.563 MPa m1/2.
Key words: Alumina · SiC · Nanocomposite · Heat-treatment
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