Mechanical properties and ballistic behavior of LiF-added Al2O3–4 wt%Nb2O5 ceramics

• Main Authors: Jheison Lopes dos Santos, Rubens Lincoln Santana Blazutti Marçal, Paulo Roberto Rodrigues de Jesus, Alaelson Vieira Gomes, Édio Pereira Lima, Jr, Daniel Navarro da Rocha, Maria Aparecida Pinheiro dos Santos, Lucio Fabio Cassiano Nascimento, Sergio Neves Monteiro, Luis Henrique Leme Louro
• Format: Article
• Language: English
• Published: Elsevier 2018-10-01
• Series: Journal of Materials Research and Technology
• Online Access: http://www.sciencedirect.com/science/article/pii/S2238785418301935

For the first time, the behavior of LiF-added alumina-niobia ceramics was quasi-static and dynamically analyzed in ballistic tests. Different compositions were investigated for the compound Al2O3–4 wt%Nb2O5–nLiF, with n ranging from 0 to 1.50 wt%, processed at three different sintering temperatures (1300, 1350 and 1400 °C). Elastic properties, elastic wave velocities, Vickers microhardness and ballistic tests were performed according to standards. The results showed that the LiF addition benefits the Al2O3–4 wt%Nb2O5 ceramic properties, allowing to reduce by approximately 100 °C the sintering temperature without impairing the ballistic performance. The Al2O3–4 wt%Nb2O5–0.5 wt%LiF ceramics exhibit comparable properties to the commonly used Al2O3–4 wt%Nb2O5 ceramics. Keywords: Alumina, Niobia, Lithium fluoride, Mechanical properties, Elastic properties, Ballistic test