Composition
High Al2O3 and Al2O3-ZrO2 ceramics have been successfully applied to armor materials for individuals and tanks. High Al2O3 porcelain is a novel application as a bulletproof and protective structural material. American ceramic armor was first developed in the 1960s as bullet-proof vests and helicopter bases. The main requirement is to prevent the penetration of bullets and shells, and the ceramic itself is light in weight (relative to metal).
Performance
Countries in the world are still developing, Al2O3 bulletproof ceramics are mainly used for the protection of individuals and key parts of tanks, aircraft and helicopters, and mine explosions during combat.
Structure microhumid
Armored Al2O3 ceramics are based on Al2O3-SiO2-CaO-MgO and Al2O3-MgO systems with contents of 96, 97, 98, 98. In ZrO2 ceramics, Al2O3 and ZrO2 have a special ratio (Y2O3 is used as a stabilizer). As the main raw material, Al2O3 is made of industrialized ultrafine powder. These Al2O3 have high purity (Al2O3≥99 depends on the grade of Al2O3, and the content of α-Al2O3 should be 95Wt% or higher.
The D50 and average grain size of Al2O3 powder are 0.35~01~1.4μm. The BET is 8～11m2/g and 2～3㎡/g respectively. The D50 and average grain size of Y2O3 are 8-9m2/g. Al2O3 and ZrO2 powders should be selected with proper ratio and particle size distribution, best manufacturing capacity, best liquid phase sintering and densification.
