Microstructure and mechanical properties of Al2O3/ZrO2 composites by two-step sintering

Author(s)

Ojaimi, Christiane L. ^[1] ; Ferreira, Julieta A. ^[1] ; Chinelatto, Adilson L. ^[2] ; Salem, Raphael E. P. ^[3] ; Chinelatto, Adriana S. A. ^[2] ; Pallone, Eliria M. J. A. ^[1]

Affiliation

^[1] Univ Sao Paulo, Dept Biosyst Engn, Ave Duque de Caxias Norte 225, BR-13635900 Pirassununga, SP - Brazil

^[2] State Univ Ponta Grossa UEPG, Dept Mat Engn, Ponta Grossa, Parana - Brazil

^[3] Fed Univ Technol Parana UTFPR, Dept Mat Engn, Londrina, Parana - Brazil

• Document type: Journal article
• Source: International Journal of Applied Ceramic Technology; v. 17, n. 4 MAY 2020.
• Web of Science Citations: 0

Abstract

Composites of Al2O3/ZrO2 (containing 25, 50, and 75 vol% ZrO2) were prepared by mixing Al2O3 and ZrO2 suspensions. The microstructural control via two-step sintering (TSS) was the main objective of this work. For this purpose, different sintering curves were constructed, aiming to achieve the best temperature combination for the sintering steps that provides higher density and finer microstructure. The results were compared with single-step sintering (SSS). Furthermore, microhardness and fracture toughness were measured for the best TSS specimens under each composition. The results showed that the high densities were obtained, and the reduction of grain size was greater than 40% for two-step sintered specimens, compared to SSS ones. Consequently, microhardness values increased. However, fracture toughness values remained unchanged. (AU)

• FAPESP's process: 16/13256-1 - Study of the behavior of zirconia /alumina composites using flash sintering process and two-step sintering
• Grantee: Christiane Lago Ojaimi
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 15/07319-8 - Study ultra rapid sintering and low energy consumption: flash Sintering
• Grantee: Eliria Maria de Jesus Agnolon Pallone
• Support Opportunities: Regular Research Grants