Iranian Journal of Ceramic Science & Engineering
Volume 12, Issue 3 (Autumn 2023)
2023, 12(3): 68-86 |
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Vatanparast V, Mashhadi M. Investigating The Effect of Adding TiB2 on Mechanical Properties and Thermal Oxidation Behavior of ZrB2-SiC-TiB2 Nanocomposite Sintered By Pressureless Method. Iranian Journal of Ceramic Science & Engineering 2023; 12 (3) :68-86
URL: http://ijcse.ir/article-1-962-en.html
URL: http://ijcse.ir/article-1-962-en.html
1- Malek-e-Ashtar University of Technology , patriot.vahid@yahoo.com
2- Malek-e-Ashtar University of Technology
2- Malek-e-Ashtar University of Technology
Abstract: (559 Views)
High-temperature ceramics possess significant potential for aerospace, military, and industrial applications due to their unique properties. One such ceramic is the ZrB2-SiC composite, which has garnered considerable attention and extensive research. This study investigated the effect of adding TiB2 on the pressureless sintering behavior, as well as the mechanical, microstructural, and thermal properties of the ZrB2-SiC nanocomposite. For this purpose, TiB2 particles were added in varying amounts of 0, 5, 10, 15, 20, 25, and 30 weight percent, with a constant amount of 3 weight percent B4C, to the ZrB2-15.5 vol.% SiC nano/micron matrix. The resulting powders were ball-milled for 2 hours at 300 rpm. The resulting mixtures were first uniaxially pressed at 100 MPa and then subjected to cold isostatic pressing (CIP) at 200 MPa. The samples were subsequently sintered at 2100°C in an argon atmosphere using the pressureless sintering method. The results indicated that the formation of the solid solution (Zr,Ti)B2 in the compositions led to improvements in the physical and mechanical properties of the samples. The highest properties were observed in the sample containing 30 weight percent TiB2, with a relative density of 96.66%, hardness of 16.74 GPa, and fracture toughness of 4.69 MPa.m1/2. The results also showed that the addition of TiB2 did not improve the oxidation resistance of the samples, with the highest oxidation resistance observed in the sample without TiB2, which had a mass erosion rate of 1.37 mg/s and a linear erosion rate of 1.03 mm/s.
Keywords: Zirconium Diboride, Titanium Diboride, Pressureless Sintering, Densification, Mechanical Properties, Thermal Oxidation.
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