Study of the behavior of zirconia /alumina composites using flash sintering process and two-step sintering

• Grant number: 16/13256-1
• Support Opportunities: Scholarships in Brazil - Doctorate
• Start date: October 01, 2016
• End date: August 31, 2019
• Field of knowledge: Engineering - Materials and Metallurgical Engineering - Nonmetallic Materials
• Principal Investigator: Eliria Maria de Jesus Agnolon Pallone
• Grantee: Christiane Lago Ojaimi
• Host Institution: Faculdade de Zootecnia e Engenharia de Alimentos (FZEA). Universidade de São Paulo (USP). Pirassununga , SP, Brazil

Abstract

Sintering is one of the most important processing steps of a ceramic body. It is always a challenge to achieve a dense material with grain size in the submicrometer or nanometer scale, whereas the densification and grain growth occur simultaneously. Thus, the research related to sintering is constantly improving, and methods that employ the use of an electric field during sintering, known as field assisted sintering techniques, have been widely studied. Among these techniques, there is the flash sintering, where a specimen is placed in direct contact with two electrodes, and through them an electric field is applied while the material is heated in a conventional furnace. The densification occurs quickly and in a short time at a lower temperature, compared to the conventional sintering temperature used. The explanation for this phenomenon is still much debated, because it still seeks understanding for this promising event. In this context, the main objective of this project is to study the conventional sintering process steps and a new field assisted sintering technique, known as flash sintering, on a zirconia/alumina composite. From the physical and microstructural characterization of different compositions and conditions to be studied, we seek to understand the mechanism involved in the flash sintering process and conventional sintering in steps.

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

OJAIMI, CHRISTIANE LAGO; FERREIRA, JULIETA ADRIANA; DOS SANTOS, FABIO ANDRE; CHINELATTO, ADILSON LUIZ; DE JESUS AGNOLON PALLONE, ELIRIA MARIA; ANTONIO CHINELATTO, ADRIANA SCOTON. Mechanical characterisation and hydrothermal degradation of Al2O3-15 % vol ZrO2 nanocomposites consolidated by two-step sintering. CERAMICS INTERNATIONAL, v. 44, n. 14, p. 16128-16136, OCT 1 2018. (16/13256-1, 15/07319-8)

OJAIMI, CHRISTIANE LAGO; FERREIRA, JULIETA ADRIANA; CHINELATTO, ADILSON LUIZ; ANTONIO CHINELATTO, ADRIANA SCOTON; DE JESUS AGNOLON PALLONE, ELIRIA MARIA. Microstructural analysis of ZrO2/Al2O3 composite: Flash and conventional sintering. CERAMICS INTERNATIONAL, v. 46, n. 2, p. 2473-2480, FEB 1 2020. (16/13256-1, 15/07319-8)

OJAIMI, CHRISTIANE L.; FERREIRA, JULIETA A.; CHINELATTO, ADILSON L.; SALEM, RAPHAEL E. P.; CHINELATTO, ADRIANA S. A.; PALLONE, ELIRIA M. J. A.. Microstructure and mechanical properties of Al2O3/ZrO2 composites by two-step sintering. International Journal of Applied Ceramic Technology, v. 17, n. 4, MAY 2020. (16/13256-1, 15/07319-8)

Academic Publications

(References retrieved automatically from State of São Paulo Research Institutions)

OJAIMI, Christiane Lago. Behavior of ZrO2 / Al2O3 composites using flash and conventional sintering processes. 2019. Doctoral Thesis - Universidade de São Paulo (USP). Faculdade de Zootecnica e Engenharia de Alimentos (FZE/BT) Pirassununga.