Flash sintering of complex shapes

Role of microstructure reactivity and surface diffusion in explaining flash (ultra-rapid) sintering kinetics

“…In SPS, the electric and thermal contact resistances present at all internal interfaces play a major role in the development of these gradients [43]. In a previous study [34,44,45], we have shown that the thermal contact resistance tends to generate an important thermal confinement of the heating of the specimen at high temperature. The thermal contact resistance tends then to magnify the temperature difference between the specimen and the measurement location.…”

Far from equilibrium ultrafast high‐temperature sintering of ZrO2–SiO2 nanocrystalline glass–ceramics

“…The prolonged high‐temperature exposure might cause adverse effects on the microstructures of ceramics, such as grain coarsening, undesired chemical reactions, loss of light elements by sublimation, and abnormal grain growth. To overcome these limitations of HP and HIP, in the last decades some innovative sintering routes like SPS, 1 cold sintering, 2 flash sintering (FS), 3 and microwave sintering (MWS) 4 have merged. These sintering routes have significantly promoted the development of sintering technology.…”

Flash microwave sintering of zirconia by multiple susceptors cascade strategy

“…In a recent article in Science, Wang et al obtained flat shapes and lattice structures of different ceramics (Al2O3, YSZ, oxide-based garnet-type solid state electrolytes) by reactive flash sintering, starting from 3D printed structures [35]. By coupling flash SPS with the deformed interface method [36], a recent study showed the possibility to obtain 30 mm gears in zirconia by flash SPS, with a submicronic microstructure [37]. All these advances are very promising but for 3D complex shapes, a contactless volumetric heating would represent a better solution for the flash sintering of oxides.…”