Fabrication of Transparent Polycrystalline ZnAl^sub 2^O^sub 4^ - A New Optical Bulk Ceramic

There is interest in the enlarging of the bulk, transparent ceramics family. Polycrystalline ... may constitute a useful addition to the existent set of such materials. The objective of this work was the development of a technology allowing the fabrication of bulk, polycrystalline, transparent ... parts. It was determined that a nano ... powder, synthesized by the hydrothermal technique, can be formed into green bodies having an average pore size of 30 nm and a bulk density of ~55% TD. A two stage sintering process, in which air heating (1500...C) was followed by hot-isostatic pressing (1550...C), densified small (20 mm in diameter) disks to a bulk density ...TD. Such specimens exhibit an in-line transmission of 78% (... = 800 nm; t = 2 mm), a hardness of 10.5 GPa and an average grains size of 1.1 ...m. (ProQuest: ... denotes formulae/symbols omitted.)