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Carbothermal reduction of ZrSiO4 for in situ formation of ZrO2-based composites using spark plasma sintering.

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Title: Carbothermal reduction of ZrSiO4 for in situ formation of ZrO2-based composites using spark plasma sintering.
Authors: Irankhah, Reza1 (AUTHOR) r.irankhah@semnan.ac.ir, Mobasherpour, Iman2 (AUTHOR), Alizadeh, Masoud2 (AUTHOR), Moosavi Nezhad, Seyyed Mohsen3 (AUTHOR), Nikzad, Leila2 (AUTHOR), Azar, Saeed Samadi2 (AUTHOR)
Source: Ceramics International. Jan2023, Vol. 49 Issue 2, p2681-2688. 8p.
Subjects: Thermal plasmas, Carbon composites, Activated carbon, Bending strength, Vickers hardness, Flexural strength, Zirconium oxide
Abstract: In the present study, ZrO 2 based composites were synthesized in-situ and sintered by the novel RSPS-assisted carbothermal reduction of ZrSiO 4 (Z) in the presence of graphite (G) and Activated Carbon (AC). The RSPS process was performed using a vacuum furnace at different temperatures of 1400–1600°C for 5–15 min under an external pressure of 30 MPa. The thermodynamic analysis was conducted on the synthesis process by FactSage software. The microstructure development and mechanical properties of RSPS-ed ZrO 2 -based composites were investigated. The Phase evolution and phase content, as functions of temperature, were characterized using x-ray diffraction and FESEM/EDS analysis. The XRD studies showed that all primary ZrSiO 4 was decomposed into ZrO 2 , ZrC, SiC, and SiO 2 phases. The unreacted graphite or activated carbon was also identified in the samples. Finally, the hardness and flexural strength of the composites were examined by Vickers hardness and 3-point bending strength tests. The results indicate that the SPS-ed ZrSiO 4 + Activated Carbon composite (ZAS-3) has the best mechanical properties. A density of 2.87 ± 0.05 g/Cm3, an open porosity of 0.02%, a bending strength of 132.4 ± 11.2 MPa and a hardness of 9.86 ± 1.1 GPa were estimated for the SPS-ed ZrSiO 4 + Activated Carbon mixture of powders at 1600°C. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:In the present study, ZrO 2 based composites were synthesized in-situ and sintered by the novel RSPS-assisted carbothermal reduction of ZrSiO 4 (Z) in the presence of graphite (G) and Activated Carbon (AC). The RSPS process was performed using a vacuum furnace at different temperatures of 1400–1600°C for 5–15 min under an external pressure of 30 MPa. The thermodynamic analysis was conducted on the synthesis process by FactSage software. The microstructure development and mechanical properties of RSPS-ed ZrO 2 -based composites were investigated. The Phase evolution and phase content, as functions of temperature, were characterized using x-ray diffraction and FESEM/EDS analysis. The XRD studies showed that all primary ZrSiO 4 was decomposed into ZrO 2 , ZrC, SiC, and SiO 2 phases. The unreacted graphite or activated carbon was also identified in the samples. Finally, the hardness and flexural strength of the composites were examined by Vickers hardness and 3-point bending strength tests. The results indicate that the SPS-ed ZrSiO 4 + Activated Carbon composite (ZAS-3) has the best mechanical properties. A density of 2.87 ± 0.05 g/Cm3, an open porosity of 0.02%, a bending strength of 132.4 ± 11.2 MPa and a hardness of 9.86 ± 1.1 GPa were estimated for the SPS-ed ZrSiO 4 + Activated Carbon mixture of powders at 1600°C. [ABSTRACT FROM AUTHOR]
ISSN:02728842
DOI:10.1016/j.ceramint.2022.09.248