The effect of powder type and CaO additive on properties of sintered SiC by pressureless sintering in additive system of Al2O3-Y2O3-CaO

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eshaghian Razieh; EHSANI NASER; BAHARVANDI HAMIDREZA; SAEEDI HEYDARI MINA

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Journal: CERAMIC SCIENCE & ENGINEERING Year:2020 | Volume:8 | Issue:4 Page(s): 1-13

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Title

The effect of powder type and CaO additive on properties of sintered SiC by pressureless sintering in additive system of Al2O3-Y2O3-CaO

Author(s)

eshaghian Razieh | EHSANI NASER | BAHARVANDI HAMIDREZA | SAEEDI HEYDARI MINA | Issue Writer Certificate

Keywords

silicon carbideQ2

pressureless sinteringQ1

Al2O3-Y2O3-CaOQ1

sinterabilityQ2

Abstract

In this study, the effect of two types of SiC powders consist of SiC-1 (β-SiC) and SiC-2 (β-SiC+α-SiC) and also different values of CaO additive consist of 0, 0. 4 and 0. 8 weight percent on sintering behavior of sintered SiC with pressureless technique in Al2O3-Y2O3-CaO additive system was investigated. In all specimens, Al2O3: Y2O3 molar ratio was equal to 3: 2 and all amounts of additive were equal to 9 weight percent. Specimens were sintered at 1900º C for 1 hour in argon atmosphere. Results show that relative density, elastic modulus, micro hardness and fracture toughness of specimens sintered with SiC-2 is higher than specimens sintered with SiC-1. Also results showed that by adding CaO to 0. 4 weight percent in both SiC powder types, sinterability increased and by increasing CaO amount to 0. 8 weight percent, sinterability decreased. Maximum value of relative density and elastic modulus in specimens sintered with SiC-1 were respectively 80. 86 % and 273. 99± 11 GPa and in specimens sintered with SiC-2 were respectively 92. 34 % and 344. 55± 8. 4 GPa. Also maximum amounts of micro hardness and fracture toughness in specimens sintered with SiC-2 powder and 0. 4 weight percent of CaO were obtained 19. 5± 0. 82 GPa and 4. 7± 0. 5 MPa. respectively.

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APA: Copy

eshaghian, Razieh, EHSANI, NASER, BAHARVANDI, HAMIDREZA, & SAEEDI HEYDARI, MINA. (2020). The effect of powder type and CaO additive on properties of sintered SiC by pressureless sintering in additive system of Al2O3-Y2O3-CaO. CERAMIC SCIENCE & ENGINEERING, 8(4 ), 1-13. SID. https://sid.ir/paper/227868/en

Vancouver: Copy

eshaghian Razieh, EHSANI NASER, BAHARVANDI HAMIDREZA, SAEEDI HEYDARI MINA. The effect of powder type and CaO additive on properties of sintered SiC by pressureless sintering in additive system of Al2O3-Y2O3-CaO. CERAMIC SCIENCE & ENGINEERING[Internet]. 2020;8(4 ):1-13. Available from: https://sid.ir/paper/227868/en

IEEE: Copy

Razieh eshaghian, NASER EHSANI, HAMIDREZA BAHARVANDI, and MINA SAEEDI HEYDARI, “The effect of powder type and CaO additive on properties of sintered SiC by pressureless sintering in additive system of Al2O3-Y2O3-CaO,” CERAMIC SCIENCE & ENGINEERING, vol. 8, no. 4 , pp. 1–13, 2020, [Online]. Available: https://sid.ir/paper/227868/en

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