Effect of post-sintering heat treatment on mechanical properties and microstructure of SiC-TiB2 composites
Apstrakt
Dense SiC-TiB2 composites with 24 vol% TiB2 were fabricated by pressureless sintering at 1940 degrees C. Al2O3 and Y2O3 were used as sintering additives to create a liquid phase and promote densification. TiB2 was formed by an in situ reaction between TiO2, B4C and C. The sintered samples were subsequently heat-treated at temperatures ranging from 1850 degrees C to 2000 degrees C. The effect of temperature of post-sintering heat treatment on microstructure and mechanical properties of the SiC-TiB2 composite was presented. Heat treatment at 1970 degrees C considerably improved the strength and the fracture toughness of sintered samples while maintaining high density. The elongation of alpha-SiC grains during the heat treatment was found to be responsible for an increase in fracture toughness. The presence of liquid phase assisted the elongation of grains which, in turn, activated crack bridging and crack deflection toughening mechanisms. Maximum strength of 540 MPa was found to be the r...esult of improved fracture toughness. Heat treatment at temperatures above 1970 degrees C led to a deterioration of mechanical properties. (C) 2010 Elsevier B.V. All rights reserved.
Ključne reči:
SiC ceramics / Sintering / Heat treatment / Mechanical properties / MicrostructureIzvor:
Materials Science and Engineering A: Structural Materials Properties Microstructure and Processing, 2011, 528, 4-5, 2034-2041Finansiranje / projekti:
- Ministry of Economic Development and Trade of Ontario, Ministry of Science and Technological Development of the Republic of Serbia
DOI: 10.1016/j.msea.2010.11.022
ISSN: 0921-5093
WoS: 000286998900016
Scopus: 2-s2.0-78650513768
Kolekcije
Institucija/grupa
VinčaTY - JOUR AU - Bučevac, Dušan AU - Matović, Branko AU - Babić, Biljana M. AU - Krstic, Vladimir PY - 2011 UR - https://vinar.vin.bg.ac.rs/handle/123456789/4215 AB - Dense SiC-TiB2 composites with 24 vol% TiB2 were fabricated by pressureless sintering at 1940 degrees C. Al2O3 and Y2O3 were used as sintering additives to create a liquid phase and promote densification. TiB2 was formed by an in situ reaction between TiO2, B4C and C. The sintered samples were subsequently heat-treated at temperatures ranging from 1850 degrees C to 2000 degrees C. The effect of temperature of post-sintering heat treatment on microstructure and mechanical properties of the SiC-TiB2 composite was presented. Heat treatment at 1970 degrees C considerably improved the strength and the fracture toughness of sintered samples while maintaining high density. The elongation of alpha-SiC grains during the heat treatment was found to be responsible for an increase in fracture toughness. The presence of liquid phase assisted the elongation of grains which, in turn, activated crack bridging and crack deflection toughening mechanisms. Maximum strength of 540 MPa was found to be the result of improved fracture toughness. Heat treatment at temperatures above 1970 degrees C led to a deterioration of mechanical properties. (C) 2010 Elsevier B.V. All rights reserved. T2 - Materials Science and Engineering A: Structural Materials Properties Microstructure and Processing T1 - Effect of post-sintering heat treatment on mechanical properties and microstructure of SiC-TiB2 composites VL - 528 IS - 4-5 SP - 2034 EP - 2041 DO - 10.1016/j.msea.2010.11.022 ER -
@article{ author = "Bučevac, Dušan and Matović, Branko and Babić, Biljana M. and Krstic, Vladimir", year = "2011", abstract = "Dense SiC-TiB2 composites with 24 vol% TiB2 were fabricated by pressureless sintering at 1940 degrees C. Al2O3 and Y2O3 were used as sintering additives to create a liquid phase and promote densification. TiB2 was formed by an in situ reaction between TiO2, B4C and C. The sintered samples were subsequently heat-treated at temperatures ranging from 1850 degrees C to 2000 degrees C. The effect of temperature of post-sintering heat treatment on microstructure and mechanical properties of the SiC-TiB2 composite was presented. Heat treatment at 1970 degrees C considerably improved the strength and the fracture toughness of sintered samples while maintaining high density. The elongation of alpha-SiC grains during the heat treatment was found to be responsible for an increase in fracture toughness. The presence of liquid phase assisted the elongation of grains which, in turn, activated crack bridging and crack deflection toughening mechanisms. Maximum strength of 540 MPa was found to be the result of improved fracture toughness. Heat treatment at temperatures above 1970 degrees C led to a deterioration of mechanical properties. (C) 2010 Elsevier B.V. All rights reserved.", journal = "Materials Science and Engineering A: Structural Materials Properties Microstructure and Processing", title = "Effect of post-sintering heat treatment on mechanical properties and microstructure of SiC-TiB2 composites", volume = "528", number = "4-5", pages = "2034-2041", doi = "10.1016/j.msea.2010.11.022" }
Bučevac, D., Matović, B., Babić, B. M.,& Krstic, V.. (2011). Effect of post-sintering heat treatment on mechanical properties and microstructure of SiC-TiB2 composites. in Materials Science and Engineering A: Structural Materials Properties Microstructure and Processing, 528(4-5), 2034-2041. https://doi.org/10.1016/j.msea.2010.11.022
Bučevac D, Matović B, Babić BM, Krstic V. Effect of post-sintering heat treatment on mechanical properties and microstructure of SiC-TiB2 composites. in Materials Science and Engineering A: Structural Materials Properties Microstructure and Processing. 2011;528(4-5):2034-2041. doi:10.1016/j.msea.2010.11.022 .
Bučevac, Dušan, Matović, Branko, Babić, Biljana M., Krstic, Vladimir, "Effect of post-sintering heat treatment on mechanical properties and microstructure of SiC-TiB2 composites" in Materials Science and Engineering A: Structural Materials Properties Microstructure and Processing, 528, no. 4-5 (2011):2034-2041, https://doi.org/10.1016/j.msea.2010.11.022 . .