The significance of microstructure for the application of bulletproof ceramics

The phase composition and microstructure of the studied Al2O3 ceramics (96, 97, 98, 98.5, Wt%) are similar. The main crystal phase is corundum. As the content of Al2O3 increases, the content of corundum also increases. There is a small amount of anorthite in these ceramics, and a small amount of spinel as an impurity on the grain boundaries of corundum. The final ceramic grain size depends on the particle size and distribution of the original Al2O3 powder. Because the Al2O3 powder has a smaller size, the sintered ceramic has a fine microstructure, 2~4μm and 1~3μm, ZrO2－ Al2O3 ceramics are based on the best ratio and partial stabilization technology to make the ceramics have high performance. The ceramic does not contain a glass phase, and the ZrO2 crystal grains of <1 μm are uniformly distributed among the corundum crystals of 1 to 2 μm. It is likely that the ZrO2 phase prevents the growth of the corundum crystals during sintering, forming a good microstructure.