TY  - JOUR
AU  - Bučevac, Dušan
AU  - Krstic, Vladimir
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4761
AB  - Densification and mechanical properties (fracture toughness, flexural strength and hardness) of SiC-TiB2 composite were studied. Pressureless sintering experiments were carried out on samples containing 0-50 vol% of TiB2 created by in situ reaction between TiO2, B4C and carbon. Al2O3 and Y2O3 were used as sintering additives to create liquid phase and promote densification at sintering temperature of 1940 degrees C. The sintered samples were subsequently heat treated at 1970 degrees C. It was found that the presence of TiB2 serves as an effective obstacle to SiC grain growth as well as crack propagation thus increasing both strength and fracture toughness of sintered SiC-TiB2 composite. The subsequent heat treatment of sintered samples promoted the elongation of SIC matrix and further improved mechanical properties of the composite. The best mechanical properties were measured in heat-treated samples containing 12-24 vol% TiB2. The maximum flexural strength of similar to 600 MPa was obtained in samples with 12 vol%TiB2 whereas the maximum fracture toughness of 6.6 MPa m(1/2) was obtained in samples with 24 vol% TiB2. Typical microstructures of samples with the mentioned volume fractions of TiB2 consist of TiB2 particles ( LT 5 mu m) uniformly dispersed in a matrix of elongated SiC plates. (C) 2012 Elsevier B.V. All rights reserved.
T2  - Materials Chemistry and Physics
T1  - Microstructure-mechanical properties relations in SiC-TiB2 composite
VL  - 133
IS  - 1
SP  - 197
EP  - 204
DO  - 10.1016/j.matchemphys.2012.01.007
ER  - 

@article{
author = "Bučevac, Dušan and Krstic, Vladimir",
year = "2012",
abstract = "Densification and mechanical properties (fracture toughness, flexural strength and hardness) of SiC-TiB2 composite were studied. Pressureless sintering experiments were carried out on samples containing 0-50 vol% of TiB2 created by in situ reaction between TiO2, B4C and carbon. Al2O3 and Y2O3 were used as sintering additives to create liquid phase and promote densification at sintering temperature of 1940 degrees C. The sintered samples were subsequently heat treated at 1970 degrees C. It was found that the presence of TiB2 serves as an effective obstacle to SiC grain growth as well as crack propagation thus increasing both strength and fracture toughness of sintered SiC-TiB2 composite. The subsequent heat treatment of sintered samples promoted the elongation of SIC matrix and further improved mechanical properties of the composite. The best mechanical properties were measured in heat-treated samples containing 12-24 vol% TiB2. The maximum flexural strength of similar to 600 MPa was obtained in samples with 12 vol%TiB2 whereas the maximum fracture toughness of 6.6 MPa m(1/2) was obtained in samples with 24 vol% TiB2. Typical microstructures of samples with the mentioned volume fractions of TiB2 consist of TiB2 particles ( LT 5 mu m) uniformly dispersed in a matrix of elongated SiC plates. (C) 2012 Elsevier B.V. All rights reserved.",
journal = "Materials Chemistry and Physics",
title = "Microstructure-mechanical properties relations in SiC-TiB2 composite",
volume = "133",
number = "1",
pages = "197-204",
doi = "10.1016/j.matchemphys.2012.01.007"
}

Bučevac, D.,& Krstic, V.. (2012). Microstructure-mechanical properties relations in SiC-TiB2 composite. in Materials Chemistry and Physics, 133(1), 197-204.
https://doi.org/10.1016/j.matchemphys.2012.01.007

Bučevac D, Krstic V. Microstructure-mechanical properties relations in SiC-TiB2 composite. in Materials Chemistry and Physics. 2012;133(1):197-204.
doi:10.1016/j.matchemphys.2012.01.007 .

Bučevac, Dušan, Krstic, Vladimir, "Microstructure-mechanical properties relations in SiC-TiB2 composite" in Materials Chemistry and Physics, 133, no. 1 (2012):197-204,
https://doi.org/10.1016/j.matchemphys.2012.01.007 . .

TY  - 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 . .

TY  - JOUR
AU  - Bučevac, Dušan
AU  - Matović, Branko
AU  - Bošković, Snežana B.
AU  - Zec, Slavica
AU  - Krstic, Vladimir
PY  - 2011
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4172
AB  - SiC-TiB2 particulate composites were fabricated by converting TiO2 to TiB2 through the reaction between TiO2, B4C and C. The presence of initially very fine, in-situ created, TiB2 particles increased driving force for sintering and enabled fabrication of a dense composite utilizing pressureless sintering and the liquid phase created between Al2O3 and Y2O3 additives. The effect of volume fraction of the in-situ formed TiB2 on density, microstructure and flexural strength was discussed. It was found that the presence of TiB2 particles suppressed the growth of SiC grains and enhanced fracture strength. The fracture strength of samples containing 12 vol% TiB2 was more than 30% higher than that of the monolithic SIC. The effect of SIC grain size on fracture strength was also analyzed. (C) 2010 Elsevier B.V. All rights reserved.
T2  - Journal of Alloys and Compounds
T1  - Pressureless sintering of internally synthesized SiC-TiB2 composites with improved fracture strength
VL  - 509
IS  - 3
SP  - 990
EP  - 996
DO  - 10.1016/j.jallcom.2010.09.152
ER  - 

@article{
author = "Bučevac, Dušan and Matović, Branko and Bošković, Snežana B. and Zec, Slavica and Krstic, Vladimir",
year = "2011",
abstract = "SiC-TiB2 particulate composites were fabricated by converting TiO2 to TiB2 through the reaction between TiO2, B4C and C. The presence of initially very fine, in-situ created, TiB2 particles increased driving force for sintering and enabled fabrication of a dense composite utilizing pressureless sintering and the liquid phase created between Al2O3 and Y2O3 additives. The effect of volume fraction of the in-situ formed TiB2 on density, microstructure and flexural strength was discussed. It was found that the presence of TiB2 particles suppressed the growth of SiC grains and enhanced fracture strength. The fracture strength of samples containing 12 vol% TiB2 was more than 30% higher than that of the monolithic SIC. The effect of SIC grain size on fracture strength was also analyzed. (C) 2010 Elsevier B.V. All rights reserved.",
journal = "Journal of Alloys and Compounds",
title = "Pressureless sintering of internally synthesized SiC-TiB2 composites with improved fracture strength",
volume = "509",
number = "3",
pages = "990-996",
doi = "10.1016/j.jallcom.2010.09.152"
}

Bučevac, D., Matović, B., Bošković, S. B., Zec, S.,& Krstic, V.. (2011). Pressureless sintering of internally synthesized SiC-TiB2 composites with improved fracture strength. in Journal of Alloys and Compounds, 509(3), 990-996.
https://doi.org/10.1016/j.jallcom.2010.09.152

Bučevac D, Matović B, Bošković SB, Zec S, Krstic V. Pressureless sintering of internally synthesized SiC-TiB2 composites with improved fracture strength. in Journal of Alloys and Compounds. 2011;509(3):990-996.
doi:10.1016/j.jallcom.2010.09.152 .

Bučevac, Dušan, Matović, Branko, Bošković, Snežana B., Zec, Slavica, Krstic, Vladimir, "Pressureless sintering of internally synthesized SiC-TiB2 composites with improved fracture strength" in Journal of Alloys and Compounds, 509, no. 3 (2011):990-996,
https://doi.org/10.1016/j.jallcom.2010.09.152 . .

TY  - JOUR
AU  - Bučevac, Dušan
AU  - Bošković, Snežana B.
AU  - Matović, Branko
AU  - Krstic, Vladimir
PY  - 2010
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4094
AB  - SiC-TiB2 composites with up to 50 vol% TiB2 were fabricated by in-situ reaction between TiO2, B4C and C. The densification of the uniaxially pressed samples was done using pressureless sintering in the presence of sintering aids consisting of Al2O3 and Y2O3. The influence of the volume fraction of TiB2 and sintering temperature on density and fracture toughness was examined. It was found that fracture toughness is strongly affected by the volume fraction of TiB2. The presence of TiB2 particles suppresses the grain growth of SiC and facilitates different toughening mechanisms to operate which, in turn, increases fracture toughness of the composite. The highest value for fracture toughness of 5.7 MPa m(1/2) measured in samples with 30 vol% TiB2 sintered at 1940 degrees C. Crown Copyright (C) 2010 Published by Elsevier Ltd and Techna Group S.r.l. All rights reserved.
T2  - Ceramics International
T1  - Toughening of SiC matrix with in-situ created TiB2 particles
VL  - 36
IS  - 7
SP  - 2181
EP  - 2188
DO  - 10.1016/j.ceramint.2010.06.001
ER  - 

@article{
author = "Bučevac, Dušan and Bošković, Snežana B. and Matović, Branko and Krstic, Vladimir",
year = "2010",
abstract = "SiC-TiB2 composites with up to 50 vol% TiB2 were fabricated by in-situ reaction between TiO2, B4C and C. The densification of the uniaxially pressed samples was done using pressureless sintering in the presence of sintering aids consisting of Al2O3 and Y2O3. The influence of the volume fraction of TiB2 and sintering temperature on density and fracture toughness was examined. It was found that fracture toughness is strongly affected by the volume fraction of TiB2. The presence of TiB2 particles suppresses the grain growth of SiC and facilitates different toughening mechanisms to operate which, in turn, increases fracture toughness of the composite. The highest value for fracture toughness of 5.7 MPa m(1/2) measured in samples with 30 vol% TiB2 sintered at 1940 degrees C. Crown Copyright (C) 2010 Published by Elsevier Ltd and Techna Group S.r.l. All rights reserved.",
journal = "Ceramics International",
title = "Toughening of SiC matrix with in-situ created TiB2 particles",
volume = "36",
number = "7",
pages = "2181-2188",
doi = "10.1016/j.ceramint.2010.06.001"
}

Bučevac, D., Bošković, S. B., Matović, B.,& Krstic, V.. (2010). Toughening of SiC matrix with in-situ created TiB2 particles. in Ceramics International, 36(7), 2181-2188.
https://doi.org/10.1016/j.ceramint.2010.06.001

Bučevac D, Bošković SB, Matović B, Krstic V. Toughening of SiC matrix with in-situ created TiB2 particles. in Ceramics International. 2010;36(7):2181-2188.
doi:10.1016/j.ceramint.2010.06.001 .

Bučevac, Dušan, Bošković, Snežana B., Matović, Branko, Krstic, Vladimir, "Toughening of SiC matrix with in-situ created TiB2 particles" in Ceramics International, 36, no. 7 (2010):2181-2188,
https://doi.org/10.1016/j.ceramint.2010.06.001 . .

TY  - JOUR
AU  - Bučevac, Dušan
AU  - Bošković, Snežana B.
AU  - Matović, Branko
AU  - Živković, Ljiljana
AU  - Vlajic, M.
AU  - Krstic, Vladimir
PY  - 2007
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3218
AB  - Microstructure development and fracture toughness of Si3N4 composites were studied in the presence of seeds and Al2O3 + Y2O3 as sintering aids. The elongated beta-Si3N4 seeds were introduced into two different alpha-Si3N4 matrix powders; one was the ultra fine powder matrix and the other was the coarse powder matrix. The amount of seeds varied from 0 to 6 wt%. The grain growth inhibition and the mechanism of toughening were discussed and correlated with microstructure. The maximum fracture toughness of 9.0 MPa m(1/2) was obtained for ultra fine powder with 5 wt% seeds hot pressed at 1,700 degrees C for 6 h.
T2  - Journal of Materials Science
T1  - Correlation between fracture toughness and microstructure of seeded silicon nitride ceramics
VL  - 42
IS  - 18
SP  - 7920
EP  - 7926
DO  - 10.1007/s10853-007-1679-6
ER  - 

@article{
author = "Bučevac, Dušan and Bošković, Snežana B. and Matović, Branko and Živković, Ljiljana and Vlajic, M. and Krstic, Vladimir",
year = "2007",
abstract = "Microstructure development and fracture toughness of Si3N4 composites were studied in the presence of seeds and Al2O3 + Y2O3 as sintering aids. The elongated beta-Si3N4 seeds were introduced into two different alpha-Si3N4 matrix powders; one was the ultra fine powder matrix and the other was the coarse powder matrix. The amount of seeds varied from 0 to 6 wt%. The grain growth inhibition and the mechanism of toughening were discussed and correlated with microstructure. The maximum fracture toughness of 9.0 MPa m(1/2) was obtained for ultra fine powder with 5 wt% seeds hot pressed at 1,700 degrees C for 6 h.",
journal = "Journal of Materials Science",
title = "Correlation between fracture toughness and microstructure of seeded silicon nitride ceramics",
volume = "42",
number = "18",
pages = "7920-7926",
doi = "10.1007/s10853-007-1679-6"
}

Bučevac, D., Bošković, S. B., Matović, B., Živković, L., Vlajic, M.,& Krstic, V.. (2007). Correlation between fracture toughness and microstructure of seeded silicon nitride ceramics. in Journal of Materials Science, 42(18), 7920-7926.
https://doi.org/10.1007/s10853-007-1679-6

Bučevac D, Bošković SB, Matović B, Živković L, Vlajic M, Krstic V. Correlation between fracture toughness and microstructure of seeded silicon nitride ceramics. in Journal of Materials Science. 2007;42(18):7920-7926.
doi:10.1007/s10853-007-1679-6 .

Bučevac, Dušan, Bošković, Snežana B., Matović, Branko, Živković, Ljiljana, Vlajic, M., Krstic, Vladimir, "Correlation between fracture toughness and microstructure of seeded silicon nitride ceramics" in Journal of Materials Science, 42, no. 18 (2007):7920-7926,
https://doi.org/10.1007/s10853-007-1679-6 . .