Highly Dense, Transparent a-Al_2O_3 Ceramics From Ultrafine Nanoparticles Via a Standard SPS Sintering

摘要

Using discrete, ultrafine alumina, highly dense transparent (71% real in-line transmission, RIT, λ = 640 nm) ceramics were achieved with grain size as small as 260 nm using standard SPS sintering. We show that use of La~(3+) as a dopant greatly reduces sensitivity to the sintering temperatures. Transparent alumina were achieved in a large range of sintering temperatures, 1140°℃ < T < 1200℃, thus providing better reliability and flexibility into the fabrication of large sintered transparent ceramic bodies.