Ref.: McePr06-001
Apresentador: Magno Torres Carvalho
Autores (Instituição): Carvalho, M.T.(Instituto Militar de Engenharia); Alkimim, H.P.(Instituto Militar de Engenharia); Ribeiro, S.d.(Instituto Militar de Engenharia); Monteiro, S.N.(Instituto Militar de Engenharia); Melo, F.C.(Instituto de Aeronáutica e Espaço); Lima, E.d.(Instituto Militar de Engenharia);
Resumo:
Ceramic materials play a crucial role in multilayered ballistic armor for personal protection. In this study, a composite matrix consisting of 91.0 wt% SiC/ 5.5 wt% Al2O3/ and 3.5 wt% Y2O3 was liquid phase sintered at 1800 °C to enhance ballistic performance against .22 caliber ammunition. The composite incorporated 1, 5, and 15 wt% of SiO2/Al2O3/LiO2 (LAS)-glass ceramic. Characterization of the composites included X-ray diffraction (XRD), scanning electron microscopy (SEM), Vickers hardness (HV) tests, cutting susceptibility tests for wear behavior, and ballistic tests. XRD patterns confirmed the synthesis of Y/Al garnet due to Y2O3 interaction with Al2O3. SEM analysis revealed a correlation between porosity and LAS content, determined by the RGB color system indicating composite densification. HV results demonstrated an enhanced hardness of 25.11 GPa for the 1 wt% LAS composite. The cutting susceptibility test showed a maximum cutting time of 4 hours for the 1 wt% LAS, indicating hindered wear behavior by increased porosity at higher LAS contents. Ballistic tests indicated that the highest values of absorbed projectile impact energy and limit velocity were achieved for the 1 wt% LAS composites, confirming the effectiveness of this incorporation for SiC-based ceramic ballistic armor.