TY  - JOUR
AU  - Smith, Steven M.
AU  - Filipović, Suzana
AU  - Fahrenholtz, William G.
AU  - Hilmas, Gregory E.
AU  - Baldisserri, Carlo
AU  - Silvestroni, Laura
PY  - 2024
UR  - https://dais.sanu.ac.rs/123456789/16716
AB  - To date, the thermal and electrical properties of three-phase ceramics containing a boride phase, silicon carbide, and boron carbide have not been studied in detail. Further, the effect of the source of the boride powder has also not been investigated. This study produced three-phase ceramics containing titanium diboride, silicon carbide, and boron carbide using three different TiB2 sources: commercial powder, TiB2 synthesized by boro/carbothermal reduction, or (Ti,Cr)B2 synthesized by boro/carbothermal reduction to address the effect of the TiB2 source. Ceramics containing synthesized TiB2 or (Ti,Cr)B2 reached >99% relative density, while the ceramic produced from commercial powder reached ∼93% relative density. The addition of Cr reduced both the thermal and electrical conductivities, but had little effect on the Vickers hardness. The (Ti,Cr)B2–SiC–B4C ceramic had a thermal conductivity of ∼33 W/m K, an electrical conductivity of ∼105 S/m, and a hardness of ∼61 GPa at 0.49 N. The highest hardness of ∼66 GPa at a load of 0.49 N was for the TiB2–SiC–B4C ceramic made with synthesized TiB2 powder.
PB  - Wiley
T2  - Journal of the American Ceramic Society
T1  - Impact of TiB2 source on the microstructure and properties of TiB2–SiC–B4C ceramics
DO  - 10.1111/jace.19945
UR  - https://hdl.handle.net/21.15107/rcub_dais_16716
ER  - 

@article{
author = "Smith, Steven M. and Filipović, Suzana and Fahrenholtz, William G. and Hilmas, Gregory E. and Baldisserri, Carlo and Silvestroni, Laura",
year = "2024",
abstract = "To date, the thermal and electrical properties of three-phase ceramics containing a boride phase, silicon carbide, and boron carbide have not been studied in detail. Further, the effect of the source of the boride powder has also not been investigated. This study produced three-phase ceramics containing titanium diboride, silicon carbide, and boron carbide using three different TiB2 sources: commercial powder, TiB2 synthesized by boro/carbothermal reduction, or (Ti,Cr)B2 synthesized by boro/carbothermal reduction to address the effect of the TiB2 source. Ceramics containing synthesized TiB2 or (Ti,Cr)B2 reached >99% relative density, while the ceramic produced from commercial powder reached ∼93% relative density. The addition of Cr reduced both the thermal and electrical conductivities, but had little effect on the Vickers hardness. The (Ti,Cr)B2–SiC–B4C ceramic had a thermal conductivity of ∼33 W/m K, an electrical conductivity of ∼105 S/m, and a hardness of ∼61 GPa at 0.49 N. The highest hardness of ∼66 GPa at a load of 0.49 N was for the TiB2–SiC–B4C ceramic made with synthesized TiB2 powder.",
publisher = "Wiley",
journal = "Journal of the American Ceramic Society",
title = "Impact of TiB2 source on the microstructure and properties of TiB2–SiC–B4C ceramics",
doi = "10.1111/jace.19945",
url = "https://hdl.handle.net/21.15107/rcub_dais_16716"
}

Smith, S. M., Filipović, S., Fahrenholtz, W. G., Hilmas, G. E., Baldisserri, C.,& Silvestroni, L.. (2024). Impact of TiB2 source on the microstructure and properties of TiB2–SiC–B4C ceramics. in Journal of the American Ceramic Society
Wiley..
https://doi.org/10.1111/jace.19945
https://hdl.handle.net/21.15107/rcub_dais_16716

Smith SM, Filipović S, Fahrenholtz WG, Hilmas GE, Baldisserri C, Silvestroni L. Impact of TiB2 source on the microstructure and properties of TiB2–SiC–B4C ceramics. in Journal of the American Ceramic Society. 2024;.
doi:10.1111/jace.19945
https://hdl.handle.net/21.15107/rcub_dais_16716 .

Smith, Steven M., Filipović, Suzana, Fahrenholtz, William G., Hilmas, Gregory E., Baldisserri, Carlo, Silvestroni, Laura, "Impact of TiB2 source on the microstructure and properties of TiB2–SiC–B4C ceramics" in Journal of the American Ceramic Society (2024),
https://doi.org/10.1111/jace.19945 .,
https://hdl.handle.net/21.15107/rcub_dais_16716 .

TY  - JOUR
AU  - Silvestroni, Laura
AU  - Gilli, Nicola
AU  - Sangiorgi, Alex
AU  - Corozzi, Alessandro
AU  - Filipović, Suzana
AU  - Obradović, Nina
AU  - Ortiz-Membrado, Laia
AU  - Jiménez-Piqué, Emilio
AU  - Fahrenholtz, William G.
PY  - 2023
UR  - https://dais.sanu.ac.rs/123456789/14009
AB  - Multi-phase ceramics based on ZrB2, TiB2 and doped with CrB2 and SiC were prepared by powder metallurgy and hot pressing to explore the possibility of obtaining multi-scale microstructures by super-saturation of complex (Zr,Ti,Cr)B2 solid solutions. Core–shell structures formed in TiB2 grains, whereas ZrB2 appeared to form a homogeneous solid solution with the other metals. Precipitation of nano-inclusions within both micron-sized borides was assessed by transmission electron microscopy and thermodynamics elucidated the preferential formation of boride inclusions due to the specific sintering atmosphere. In addition, atomic size factors explicated the precipitation of CrB2 nano-particles into ZrB2-rich grains and of ZrB2 nano-particles into TiB2-rich grains. The hardness of the constituent phases measured by nanoindentation ranged from 36 to 43 GPa.
PB  - Tsinghua University Press
T2  - Journal of Advanced Ceramics
T1  - Multi-phase (Zr,Ti,Cr)B2solid solutions: Preparation, multi-scale microstructure, and local properties
SP  - 414
EP  - 431
VL  - 12
IS  - 2
DO  - 10.26599/JAC.2023.9220695
UR  - https://hdl.handle.net/21.15107/rcub_dais_14009
ER  - 

@article{
author = "Silvestroni, Laura and Gilli, Nicola and Sangiorgi, Alex and Corozzi, Alessandro and Filipović, Suzana and Obradović, Nina and Ortiz-Membrado, Laia and Jiménez-Piqué, Emilio and Fahrenholtz, William G.",
year = "2023",
abstract = "Multi-phase ceramics based on ZrB2, TiB2 and doped with CrB2 and SiC were prepared by powder metallurgy and hot pressing to explore the possibility of obtaining multi-scale microstructures by super-saturation of complex (Zr,Ti,Cr)B2 solid solutions. Core–shell structures formed in TiB2 grains, whereas ZrB2 appeared to form a homogeneous solid solution with the other metals. Precipitation of nano-inclusions within both micron-sized borides was assessed by transmission electron microscopy and thermodynamics elucidated the preferential formation of boride inclusions due to the specific sintering atmosphere. In addition, atomic size factors explicated the precipitation of CrB2 nano-particles into ZrB2-rich grains and of ZrB2 nano-particles into TiB2-rich grains. The hardness of the constituent phases measured by nanoindentation ranged from 36 to 43 GPa.",
publisher = "Tsinghua University Press",
journal = "Journal of Advanced Ceramics",
title = "Multi-phase (Zr,Ti,Cr)B2solid solutions: Preparation, multi-scale microstructure, and local properties",
pages = "414-431",
volume = "12",
number = "2",
doi = "10.26599/JAC.2023.9220695",
url = "https://hdl.handle.net/21.15107/rcub_dais_14009"
}

Silvestroni, L., Gilli, N., Sangiorgi, A., Corozzi, A., Filipović, S., Obradović, N., Ortiz-Membrado, L., Jiménez-Piqué, E.,& Fahrenholtz, W. G.. (2023). Multi-phase (Zr,Ti,Cr)B2solid solutions: Preparation, multi-scale microstructure, and local properties. in Journal of Advanced Ceramics
Tsinghua University Press., 12(2), 414-431.
https://doi.org/10.26599/JAC.2023.9220695
https://hdl.handle.net/21.15107/rcub_dais_14009

Silvestroni L, Gilli N, Sangiorgi A, Corozzi A, Filipović S, Obradović N, Ortiz-Membrado L, Jiménez-Piqué E, Fahrenholtz WG. Multi-phase (Zr,Ti,Cr)B2solid solutions: Preparation, multi-scale microstructure, and local properties. in Journal of Advanced Ceramics. 2023;12(2):414-431.
doi:10.26599/JAC.2023.9220695
https://hdl.handle.net/21.15107/rcub_dais_14009 .

Silvestroni, Laura, Gilli, Nicola, Sangiorgi, Alex, Corozzi, Alessandro, Filipović, Suzana, Obradović, Nina, Ortiz-Membrado, Laia, Jiménez-Piqué, Emilio, Fahrenholtz, William G., "Multi-phase (Zr,Ti,Cr)B2solid solutions: Preparation, multi-scale microstructure, and local properties" in Journal of Advanced Ceramics, 12, no. 2 (2023):414-431,
https://doi.org/10.26599/JAC.2023.9220695 .,
https://hdl.handle.net/21.15107/rcub_dais_14009 .

TY  - CONF
AU  - Filipović, Suzana
AU  - Obradović, Nina
AU  - Gilli, Nicola
AU  - Silvestroni, Laura
PY  - 2022
UR  - https://dais.sanu.ac.rs/123456789/13119
AB  - Ultra-high temperature ceramics, such as ZrB2, are convenient for application in hypersonic systems due to melting point higher than 3000 °C and excellent ablation resistance. For such application further improvement by addition
of second phases, including SiC or CrB2, has additional benefits in domain of oxidation behavior, while TiB, doping reduces material's weight. A powder mixture of ZrB2, TiB2, CrB, and SiC was high energy ball-mill trough four steps. Obtained milled powder was subjected to hot pressing following different thermal cycles. Subsequent annealing was applied to remove oxide phases and reduce micro-cracking. Due to different thermal treatment, various microstructure and hardness occur. We reached fully dense ceramics, and with different oxide-phases content depending on sintering conditions. Maximal obtained hardness was 24 GPa. Ongoing activity regards the study of the strength and oxidation resistance to assess the suitability of this multi-phase system for hypersonic applications.
PB  - Krakow : Agencja Reklamowa EURO GRAPHIC
PB  - Krakow : Polskie Towarzystwo Ceramiczne
C3  - Abstract Book / Ceramics in Europe 2022, Krakow, 10-14 July
T1  - Mechanical activation and HIP of ZrB2-TIB2 based composites for hypersonic system
SP  - 77
EP  - 77
UR  - https://hdl.handle.net/21.15107/rcub_dais_13119
ER  - 

@conference{
author = "Filipović, Suzana and Obradović, Nina and Gilli, Nicola and Silvestroni, Laura",
year = "2022",
abstract = "Ultra-high temperature ceramics, such as ZrB2, are convenient for application in hypersonic systems due to melting point higher than 3000 °C and excellent ablation resistance. For such application further improvement by addition
of second phases, including SiC or CrB2, has additional benefits in domain of oxidation behavior, while TiB, doping reduces material's weight. A powder mixture of ZrB2, TiB2, CrB, and SiC was high energy ball-mill trough four steps. Obtained milled powder was subjected to hot pressing following different thermal cycles. Subsequent annealing was applied to remove oxide phases and reduce micro-cracking. Due to different thermal treatment, various microstructure and hardness occur. We reached fully dense ceramics, and with different oxide-phases content depending on sintering conditions. Maximal obtained hardness was 24 GPa. Ongoing activity regards the study of the strength and oxidation resistance to assess the suitability of this multi-phase system for hypersonic applications.",
publisher = "Krakow : Agencja Reklamowa EURO GRAPHIC, Krakow : Polskie Towarzystwo Ceramiczne",
journal = "Abstract Book / Ceramics in Europe 2022, Krakow, 10-14 July",
title = "Mechanical activation and HIP of ZrB2-TIB2 based composites for hypersonic system",
pages = "77-77",
url = "https://hdl.handle.net/21.15107/rcub_dais_13119"
}

Filipović, S., Obradović, N., Gilli, N.,& Silvestroni, L.. (2022). Mechanical activation and HIP of ZrB2-TIB2 based composites for hypersonic system. in Abstract Book / Ceramics in Europe 2022, Krakow, 10-14 July
Krakow : Agencja Reklamowa EURO GRAPHIC., 77-77.
https://hdl.handle.net/21.15107/rcub_dais_13119

Filipović S, Obradović N, Gilli N, Silvestroni L. Mechanical activation and HIP of ZrB2-TIB2 based composites for hypersonic system. in Abstract Book / Ceramics in Europe 2022, Krakow, 10-14 July. 2022;:77-77.
https://hdl.handle.net/21.15107/rcub_dais_13119 .

Filipović, Suzana, Obradović, Nina, Gilli, Nicola, Silvestroni, Laura, "Mechanical activation and HIP of ZrB2-TIB2 based composites for hypersonic system" in Abstract Book / Ceramics in Europe 2022, Krakow, 10-14 July (2022):77-77,
https://hdl.handle.net/21.15107/rcub_dais_13119 .

TY  - CONF
AU  - Obradović, Nina
AU  - Filipović, Suzana
AU  - Gilli, N.
AU  - Silvestroni, L.
PY  - 2021
UR  - https://dais.sanu.ac.rs/123456789/12352
AB  - ZrB2 ceramics are considered potential materials for hypersonic systems in view of the melting point exceeding 3000 °C and excellent ablation resistance. Second phases, including SiC or CrB2, further improve the oxidation behavior, whereas a lighter phase, like TiB2 can decrease the overall weight. In this work, a powder mixture containing ZrB2, TiB2, CrB2 and SiC was mechanically activated using high energy ball-milling. Sintering was performed by hot pressing following different thermal cycles, and subsequent annealing to remove oxide phases and reduce micro-cracking. The microstructure and hardness of the dense ceramics are compared in relationship to the thermal history. Fully dense ceramics were obtained with different oxide-phases amount depending on the sintering cycle and hardness approaching 24 GPa were achieved. Future works will explore the strength and oxidation resistance of this multi-phase system to check its suitability for hypersonic systems.
PB  - Belgrade : Innovation Center of Faculty of Mechanical Engineering
C3  - Programme and The Book of Abstracts / International Conference of Experimental and Numerical Investigations and New Technologies - CNN TECH 2021,29 June - 02 July 2021, Zlatibor, Serbia
T1  - Preparation and characterization of ZrB2-TiB2 based composites for hypersonic systems
SP  - 83
EP  - 83
UR  - https://hdl.handle.net/21.15107/rcub_dais_12352
ER  - 

@conference{
author = "Obradović, Nina and Filipović, Suzana and Gilli, N. and Silvestroni, L.",
year = "2021",
abstract = "ZrB2 ceramics are considered potential materials for hypersonic systems in view of the melting point exceeding 3000 °C and excellent ablation resistance. Second phases, including SiC or CrB2, further improve the oxidation behavior, whereas a lighter phase, like TiB2 can decrease the overall weight. In this work, a powder mixture containing ZrB2, TiB2, CrB2 and SiC was mechanically activated using high energy ball-milling. Sintering was performed by hot pressing following different thermal cycles, and subsequent annealing to remove oxide phases and reduce micro-cracking. The microstructure and hardness of the dense ceramics are compared in relationship to the thermal history. Fully dense ceramics were obtained with different oxide-phases amount depending on the sintering cycle and hardness approaching 24 GPa were achieved. Future works will explore the strength and oxidation resistance of this multi-phase system to check its suitability for hypersonic systems.",
publisher = "Belgrade : Innovation Center of Faculty of Mechanical Engineering",
journal = "Programme and The Book of Abstracts / International Conference of Experimental and Numerical Investigations and New Technologies - CNN TECH 2021,29 June - 02 July 2021, Zlatibor, Serbia",
title = "Preparation and characterization of ZrB2-TiB2 based composites for hypersonic systems",
pages = "83-83",
url = "https://hdl.handle.net/21.15107/rcub_dais_12352"
}

Obradović, N., Filipović, S., Gilli, N.,& Silvestroni, L.. (2021). Preparation and characterization of ZrB2-TiB2 based composites for hypersonic systems. in Programme and The Book of Abstracts / International Conference of Experimental and Numerical Investigations and New Technologies - CNN TECH 2021,29 June - 02 July 2021, Zlatibor, Serbia
Belgrade : Innovation Center of Faculty of Mechanical Engineering., 83-83.
https://hdl.handle.net/21.15107/rcub_dais_12352

Obradović N, Filipović S, Gilli N, Silvestroni L. Preparation and characterization of ZrB2-TiB2 based composites for hypersonic systems. in Programme and The Book of Abstracts / International Conference of Experimental and Numerical Investigations and New Technologies - CNN TECH 2021,29 June - 02 July 2021, Zlatibor, Serbia. 2021;:83-83.
https://hdl.handle.net/21.15107/rcub_dais_12352 .

Obradović, Nina, Filipović, Suzana, Gilli, N., Silvestroni, L., "Preparation and characterization of ZrB2-TiB2 based composites for hypersonic systems" in Programme and The Book of Abstracts / International Conference of Experimental and Numerical Investigations and New Technologies - CNN TECH 2021,29 June - 02 July 2021, Zlatibor, Serbia (2021):83-83,
https://hdl.handle.net/21.15107/rcub_dais_12352 .