Novel Alumina Compounds with Niobia, Silica and Magnesia for Ballistic Armor

Abstract:

Compounds of alumina APC-2011 SG with niobia, silica and magnesia were sintered at 1400°C/3h, in order to evaluate their ballistic performance. The content of niobia (Nb₂O₅) was 4.0 to 8.0 wt.%; silica (SiO₂) was 0.8 wt.%; and magnesia (MgO) at 0.15 wt.%. Sintered samples were characterized by hardness, densification and energy absorption at impact. Ballistic tests were performed by ceramic discs firmly glued to steel plates and then subjecting the target to impact using 7.62 mm projectile shot from a rifle with a throw distance of 5 m. The energy absorbed by the disintegration of the ceramic discs was estimated by the residual velocity. The fracture surfaces of the samples were observed by scanning electron microscopy. It was verified for the first that the addition of high amounts of Nb₂O₅ to the alumina with the presence of SiO₂ and MgO increases the presence of vitreous phase in the contours of alumina grains and improved the properties of the material for use in ballistic protection.

• Periodical: Materials Science Forum (Volume 1012)
• Pages: 196-201
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.1012.196
• Online since: October 2020
• Authors: Alaelson Vieira Gomes*, Edio Pereira Lima Jr., Paulo Roberto Rodrigues de Jesus, Lucio Fabio Cassiano Nascimento, Jheison Lopes dos Santos, Sergio Neves Monteiro, Luis Henrique Leme Louro
• Keywords: Alumina, Ballistic Armor, Magnesia, Niobia, Silica

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