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-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 ×,

SUBMITTER: Mirkhalaf M 

PROVIDER: S-EPMC7997883 | biostudies-literature | 2021 Mar

REPOSITORIES: biostudies-literature