resumo
In the present work, dense and tough alumina toughened zirconia (ATZ) composites reinforced with strontium hexaluminate platelets (S6A) were developed by Direct Ink Writing. To avoid the issues related with the direct addition of high aspect ratio particles, the S6A platelets were grown in situ during the sintering step. The influence of the S6A precursor addition on the printability of the ATZ paste and subsequently on the densification, microstructure and mechanical properties of the printed parts were studied. Proper printability was attained for pastes with 40 vol% of solids in the presence of different amounts of S6A precursors. Good dispersibility of the S6A platelets was observed in the sintered microstructures, for all considered concentrations (2.5, 5 and 7.5 vol %). Samples reinforced with S6A platelets exhibited densities around 98-99 %, while the best trade-off between flexural strength (768 MPa), fracture toughness (8.5 MPa root m) and hardness (14.3 GPa) was attained for the ATZ containing 5 vol% of S6A.
palavras-chave
MECHANICAL-PROPERTIES; REINFORCED ZIRCONIA; STABILIZED ZIRCONIA; FRACTURE-TOUGHNESS; CERAMIC COMPOSITES; ALUMINA; HEXAALUMINATE; STRENGTH; TRANSFORMATION; AL2O3
categoria
Engineering; Materials Science
autores
Alves, MFRP; Lévaro, NRM; Faria, MS; Olhero, SM
nossos autores
Manuel Fellipe Rodrigues Pais Alves
Investigador
Susana Maria Henriques Olhero
Professor AuxiliarProjectos
CICECO - Aveiro Institute of Materials (UIDB/50011/2020)
CICECO - Aveiro Institute of Materials (UIDP/50011/2020)
Associated Laboratory CICECO-Aveiro Institute of Materials (LA/P/0006/2020)
agradecimentos
M.F.R.P. Alves acknowledges the FCT for the PhD grant (2021.06615.BD) . M.S. Faria acknowledges the FCT for the PhD grant (2023.04490.BDANA) . N. R. M. Levaro acknowledges the Erasmus + Programme of the European Union for funding his internship in the University of Aveiro. This work was developed within the scope of the project CICECO-Aveiro Institute of Materials, UIDB/50011/2020 (DOI 10.54499/UIDB/50011/2020) , UIDP/50011/2020 (DOI 10.54499/UIDP/50011/2020) & LA/P/0006/2020 (DOI 10.54499/LA/P/0006/2020), financed by national funds through the FCT/MCTES (PIDDAC).