Targeting higher toughness transparent ceramics, tetragonal (3 mol % yttria) and cubic (8 mol % yttria) ZrO₂ starting powder mixtures were densified by spark plasma sintering (SPS) in vacuum at 1100 °C and post hot isostatic pressing (HIP) in argon at 1100 °C. The influence of the ultra-fine microstructure and phase composition on the fracture resistance and light transmission in the visible and infra-red range was assessed. Of special interest was the influence of a thermal annealing step in air on the transparency of the SPS and SPS-HIP ceramics.

中文翻译：

---

火花等离子体烧结和热等静压致密化的透明四方立方氧化锆复合陶瓷

针对较高韧性的透明陶瓷，通过在1100°C的真空中进行火花等离子烧结（SPS）来对四方（3 mol％氧化钇）和立方（8 mol％氧化钇）的ZrO ₂起始粉末混合物进行致密化，然后在室温下进行热等静压（HIP）。氩气在1100°C。在可见光和红外范围内，评估了超细微结构和相组成对耐断裂性和透光率的影响。特别引起关注的是空气中的热退火步骤对SPS和SPS-HIP陶瓷透明度的影响。