Effect of Dysprosia Additive on the Consolidation of CeO₂ by Spark Plasma Sintering

Abstract

The influence of dysprosia addition on the sintering and resulting microstructure of nano‐grained CeO2 ceramics was investigated as functions of the spark plasma sintering parameters. The addition of Dy2O3 (forming a solid solution) resulted in an increase in relative density and a decrease in grain size in sintered samples. The relative density of samples with Dy2O3 content of 6 and 10 mol% was over 95% when sintered at 1050°C under 500 MPa for holding times as short as 5 min. The application of high pressure facilitated the consolidation to relatively high densities with minimal grain growth. Heating rate and holding time, however, had insignificant effect on density but a measurable effect on grain size.

Field-Assisted Sintering/Spark Plasma Sintering of Gadolinium-Doped Ceria with Controlled Re-Oxidation for Crack Prevention

“…If powder with a larger particle size (approximately up to 100 nm) is used, the application of a pressure is necessary, which by far exceeds typical pressures in standard FAST/SPS. In this context, pressures in the range of 500–600 MPa are recommended [ 34 ]. The more radical measure is to prevent the contact between sintered material and graphite component of tool.…”

“…The samples were nearly dense (>98%), but small in size with a diameter of 5 mm and a thickness of 1–3 mm. Choi et al used the same tool to investigate the influence of dopant content on FAST/SPS sintering of Dy 2 O 3 -doped CeO 2 nanometric powder (primary particle size <73 nm) [ 34 ]. The dopant amount was varied between 3 and 10 wt.%.…”

Sintering trials of analogues of americium oxides for radioisotope power systems

“…There has been limited research into the SPS of pure or doped CeO2. Choi et al [26,27] investigated the SPS processing of pure nanometric CeO2 and achieved greater than 97 % relative density.…”

Electrical conductivity of nanostructured acceptor-doped ceria fabricated by spark plasma sintering (SPS)

“…The average grain size of the samples was estimated between ~100-300 nm. The prevention of grain coarsening in SPS is due to fast heating rates and accelerated diffusion mechanisms related to large thermal gradient [15]. The electrochemical properties of the samples were analyzed in Nyquist formalism, as exhibited in Fig.…”