|About this Abstract
||Materials Science & Technology 2012
||Novel Sintering Processes and News in Conventional Sintering and Grain Growth
||Current Activated Pressure Assisted Densification of Transparent Doped Alumina for Luminescent Applications
||Elias Penilla, J. E. Garay
|On-Site Speaker (Planned)
Recently there has been a resurgence in interest in functional transparent ceramics to their viability for replacing their single-crystal counterparts as laser host materials and energy efficient solid-state lighting applications. Historically, there has been significant effort devoted to doping ceramic host materials with rare-earths using processing techniques that are bound by thermodynamic equilibrium (Czochralski, sintering etc.). While extensively developed, these techniques have limitations. For example rare-earth doping of aluminum oxide (alumina) is difficult through equilibrium processes because of low rare-earth solubilities. Here we report on the application of the Current Activated Pressure Assisted Densification (CAPAD), otherwise known as Spark Plasma Sintering (SPS), for the production of rare-earth doped alumina to dopant levels as high as 1-2 atomic percent, orders of magnitude higher than possible with equilibrium methods. We have investigated the effects of temperature, heating rate, and applied pressure during CAPAD processing on the sample physical optical and thermal properties.