A comparative study of nano-fillers to improve toughness and modulus of polymer-derived ceramics

Abstract Brittleness is a major limitation of polymer-derived ceramics (PDCs). Different concentrations of three nanofillers (carbon nanotubes, Si3N4 and Al2O3 nanoparticles) were evaluated to improve both toughness and modulus of a commercial polysilazane (PSZ) PDC. The PSZs were thermally cross-li...

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Autores principales:	Mohammad Mirkhalaf, Hamidreza Yazdani Sarvestani, Qi Yang, Michael B. Jakubinek, Behnam Ashrafi
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/ff34d89396b64bc2963622d6f672a8eb
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spelling	oai:doaj.org-article:ff34d89396b64bc2963622d6f672a8eb2021-12-02T16:36:04ZA comparative study of nano-fillers to improve toughness and modulus of polymer-derived ceramics10.1038/s41598-021-82365-32045-2322https://doaj.org/article/ff34d89396b64bc2963622d6f672a8eb2021-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-82365-3https://doaj.org/toc/2045-2322Abstract Brittleness is a major limitation of polymer-derived ceramics (PDCs). Different concentrations of three nanofillers (carbon nanotubes, Si3N4 and Al2O3 nanoparticles) were evaluated to improve both toughness and modulus of a commercial polysilazane (PSZ) PDC. The PSZs were thermally cross-linked and pyrolyzed under isostatic pressure in nitrogen. A combination of mechanical, chemical, density, and microscopy characterizations was used to determine the effects of these fillers. Si3N4 and Al2O3 nanoparticles (that were found to be active fillers) were more effective than nanotubes and improved the elastic modulus, hardness, and fracture toughness (J IC ) of the PDC by ~ 1.5 ×, ~ 3 ×, and ~ 2.5 ×, respectively. Nanotubes were also effective in maintaining the integrity of the samples during pyrolysis. The modulus and hardness of PDCs correlated positively with their apparent density; this can provide a fast way to assess future PDCs. The improvement in fracture toughness was attributed to crack deflection and bridging observed in the micro-indentation cracks in the modified PDCs. The specific toughness of the modified PDCs was 4 × higher than that of high-purity alumina, and its specific modulus reached that of commercially available technical ceramics. These PDCs can also easily take different shapes and therefore are of interest in protective armor, propulsion, thermal protection, device packaging and biomaterial systems.Mohammad MirkhalafHamidreza Yazdani SarvestaniQi YangMichael B. JakubinekBehnam AshrafiNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-11 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Mohammad Mirkhalaf Hamidreza Yazdani Sarvestani Qi Yang Michael B. Jakubinek Behnam Ashrafi A comparative study of nano-fillers to improve toughness and modulus of polymer-derived ceramics
description	Abstract Brittleness is a major limitation of polymer-derived ceramics (PDCs). Different concentrations of three nanofillers (carbon nanotubes, Si3N4 and Al2O3 nanoparticles) were evaluated to improve both toughness and modulus of a commercial polysilazane (PSZ) PDC. The PSZs were thermally cross-linked and pyrolyzed under isostatic pressure in nitrogen. A combination of mechanical, chemical, density, and microscopy characterizations was used to determine the effects of these fillers. Si3N4 and Al2O3 nanoparticles (that were found to be active fillers) were more effective than nanotubes and improved the elastic modulus, hardness, and fracture toughness (J IC ) of the PDC by ~ 1.5 ×, ~ 3 ×, and ~ 2.5 ×, respectively. Nanotubes were also effective in maintaining the integrity of the samples during pyrolysis. The modulus and hardness of PDCs correlated positively with their apparent density; this can provide a fast way to assess future PDCs. The improvement in fracture toughness was attributed to crack deflection and bridging observed in the micro-indentation cracks in the modified PDCs. The specific toughness of the modified PDCs was 4 × higher than that of high-purity alumina, and its specific modulus reached that of commercially available technical ceramics. These PDCs can also easily take different shapes and therefore are of interest in protective armor, propulsion, thermal protection, device packaging and biomaterial systems.
format	article
author	Mohammad Mirkhalaf Hamidreza Yazdani Sarvestani Qi Yang Michael B. Jakubinek Behnam Ashrafi
author_facet	Mohammad Mirkhalaf Hamidreza Yazdani Sarvestani Qi Yang Michael B. Jakubinek Behnam Ashrafi
author_sort	Mohammad Mirkhalaf
title	A comparative study of nano-fillers to improve toughness and modulus of polymer-derived ceramics
title_short	A comparative study of nano-fillers to improve toughness and modulus of polymer-derived ceramics
title_full	A comparative study of nano-fillers to improve toughness and modulus of polymer-derived ceramics
title_fullStr	A comparative study of nano-fillers to improve toughness and modulus of polymer-derived ceramics
title_full_unstemmed	A comparative study of nano-fillers to improve toughness and modulus of polymer-derived ceramics
title_sort	comparative study of nano-fillers to improve toughness and modulus of polymer-derived ceramics
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/ff34d89396b64bc2963622d6f672a8eb
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A comparative study of nano-fillers to improve toughness and modulus of polymer-derived ceramics

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