Patent ID: 7247589
Filing Date: 2007-07-24
Classification: B82Y,C04B

Abstract:
1. Transparent polycrystalline sintered ceramic composed of Mg—Al spinel, Al oxynitride, ZrO 2 , Y 2 O 3 or Y—Al garnet, or of a mixed structure of these components, of cubic crystal structure, comprising a real in-line transmission RIT>75% of the theoretical maximum value measured on 0.8 mm-thick polished plates and for light of a wavelength between 600 and 650 nm, and wherein when the sintered ceramic is composed of Mg—Al spinel, Al oxynitride, ZrO wherein when the sintered ceramic is composed of Y—Al garnet, the average grain size D is in the range of 60 nm<D<1 μm.