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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Article
Thermal and Mechanical Properties of B4C-ZrB2 Ceramic Composite
Author(s)
Zviad Mestvirishvili*, Irakli Bairamashvili, Vakhtang Kvatchadze and Nugzar Rekhviashvili
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DOI:10.17265/2161-6221/2015.9-10.007
Affiliation(s)
Ivane Javakhishvili Tbilisi State University ElevterAndronikashvili Institute of Physics. 6, Tamarashvil St. 0177 Tbilisi, Georgia
ABSTRACT
B4C and B4C-ZrB2 (Zr – 3-5 wt.%) ceramic materials were obtained by the method of hot pressing at temperature range 2,050-2,140 °C and 34-40 MPa pressure, and subject to further thermal treatment at 1,800 °C. Physical and mechanical properties of the above composite, the effect of ZrB2 on the process parameters of items formation and on the obtained composite features were studied. Relatively perfect microstructure and optimum physical and mechanical properties are characteristic for B4C - 3.7% ZrB2 ceramics, the relative density of which equals 100%. Compared to B4C, it demonstrated 10% reduced average grain size and 8% higher fracture toughness; Reduced linear thermal expansion coefficient and mechanical bending strength and doubled thermal conductivity at high temperatures; Increased Young modulus, hardness and compressive strength, which make 363 MPa; 30.1 GPa and 3,175 MPa, respectively. When alloying phase (ZrB2) content increased to 6.2 wt.%, average grain size growth to 8 μm, fracture toughness, microhardness and mechanical bending strength decreased and made approximately 2.37 MPa√m, 28.2 GPa and 292 MPa, respectively.
KEYWORDS
Boron carbide, alloying, fracture toughness, thermal conductivity, hardness.
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