Evaluation of Hot Isostatic Pressing Parameters on the Optical and Ballistic Properties of Spinel for Transparent Armor; Conference paper

摘要

The effect of different hot pressing and hot isostatic pressing temperatures and pressures on the optical properties of spinel was studied. Extinction coefficients of spinel samples were estimated by comparing the measured transmittance with the theoretical transmittance as calculated via a Sellmeier model. Results showed that the relative size of the scattering sites was large compared to the wavelengths of light. Overall, increasing HIP temperature and pressure resulted in decreasing the optical extinction. The lower of two hot pressing temperatures prior to HIPing resulted in lower scatter coefficients after HIPing; this effect was most significant in the infrared. The single shot and multi-shot ballistic properties of spinel based armor system have been evaluated. Compared to single crystal sapphire and polycrystalline ALON, spinel has superior ballistic properties to that of sapphire and is comparable to ALON. Initial testing indicates that the multi- hit ballistic performance of sapphire is comparable to spinel.