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  - Silvestroni, Laura
AU  - Gilli, Nicola
AU  - Obradović, Nina
AU  - Filipović, Suzana
AU  - Watts, Jeremy L.
AU  - Fahrenholtz, William G.
PY  - 2022
UR  - https://dais.sanu.ac.rs/123456789/13617
AB  - ZrB2 is widely recognized as the most prominent ultra-high temperature ceramic for aerospace applications, in view of its melting point above 3000°C, and despite it exhibits lower oxidation and ablation resistance as compared to HfB2, it has a much lower density. The addition of TiB2 further lowers the overall weight, which is a relevant factor for materials intended to flight, but it also worsen the oxidation resistance. In this work, different Mecompounds, where Me = Nb, Hf, Cr, V, are added to the ZrB2-TiB2 system to study their effect on the densification, microstructure and thermo-mechanical properties. By adjusting the processing and sintering cycles, fully dense multi-phase ceramics with density in the 5.3-5.7 g/cm3 range and hardness close to 24 GPa have been obtained. A common feature to all materials, is the formation of solid solutions and microstructural details obtained by x-ray diffraction, scanning and electron microscopy are highlighted. Particularly, we explored the nanotexturing of the shell within micron-sized boride grains of the matrix, which resulted from the preferential precipitation of Me-compounds with poor solubility within ZrB2 or TiB2 lattice. Preliminary bending strength and oxidation behavior of these intricate bulk multiphase ceramics are also provided.
PB  - Belgrade : Serbian Ceramic Society
C3  - Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application X New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 26-27. September 2022.
T1  - Multi-phase (Zr,Ti,Me)B2 solid solutions: preparation and microstructure evolution
SP  - 37
EP  - 37
UR  - https://hdl.handle.net/21.15107/rcub_dais_13617
ER  - 

@conference{
author = "Silvestroni, Laura and Gilli, Nicola and Obradović, Nina and Filipović, Suzana and Watts, Jeremy L. and Fahrenholtz, William G.",
year = "2022",
abstract = "ZrB2 is widely recognized as the most prominent ultra-high temperature ceramic for aerospace applications, in view of its melting point above 3000°C, and despite it exhibits lower oxidation and ablation resistance as compared to HfB2, it has a much lower density. The addition of TiB2 further lowers the overall weight, which is a relevant factor for materials intended to flight, but it also worsen the oxidation resistance. In this work, different Mecompounds, where Me = Nb, Hf, Cr, V, are added to the ZrB2-TiB2 system to study their effect on the densification, microstructure and thermo-mechanical properties. By adjusting the processing and sintering cycles, fully dense multi-phase ceramics with density in the 5.3-5.7 g/cm3 range and hardness close to 24 GPa have been obtained. A common feature to all materials, is the formation of solid solutions and microstructural details obtained by x-ray diffraction, scanning and electron microscopy are highlighted. Particularly, we explored the nanotexturing of the shell within micron-sized boride grains of the matrix, which resulted from the preferential precipitation of Me-compounds with poor solubility within ZrB2 or TiB2 lattice. Preliminary bending strength and oxidation behavior of these intricate bulk multiphase ceramics are also provided.",
publisher = "Belgrade : Serbian Ceramic Society",
journal = "Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application X New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 26-27. September 2022.",
title = "Multi-phase (Zr,Ti,Me)B2 solid solutions: preparation and microstructure evolution",
pages = "37-37",
url = "https://hdl.handle.net/21.15107/rcub_dais_13617"
}

Silvestroni, L., Gilli, N., Obradović, N., Filipović, S., Watts, J. L.,& Fahrenholtz, W. G.. (2022). Multi-phase (Zr,Ti,Me)B2 solid solutions: preparation and microstructure evolution. in Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application X New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 26-27. September 2022.
Belgrade : Serbian Ceramic Society., 37-37.
https://hdl.handle.net/21.15107/rcub_dais_13617

Silvestroni L, Gilli N, Obradović N, Filipović S, Watts JL, Fahrenholtz WG. Multi-phase (Zr,Ti,Me)B2 solid solutions: preparation and microstructure evolution. in Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application X New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 26-27. September 2022.. 2022;:37-37.
https://hdl.handle.net/21.15107/rcub_dais_13617 .

Silvestroni, Laura, Gilli, Nicola, Obradović, Nina, Filipović, Suzana, Watts, Jeremy L., Fahrenholtz, William G., "Multi-phase (Zr,Ti,Me)B2 solid solutions: preparation and microstructure evolution" in Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application X New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 26-27. September 2022. (2022):37-37,
https://hdl.handle.net/21.15107/rcub_dais_13617 .

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 .