Abstract
This viewpoint article critically assesses several scientific and technological questions regarding flash sintering: (1) How does a flash start? (2) What are the possible mechanisms of rapid densifications? (3) What are the electric field/current/potential effects? (4) Can we drastically reduce the flash temperature (or even start a flash at room temperature)? (5) Can we control the microstructures (e.g., fabricate dense nanocrystalline ceramics) by manipulating the electric field/current profile? ZnO is discussed as an examplar but other materials are also critically reviewed. New results of both ZnO and Y2O3-statabilized ZrO2 are presented. Open scientific questions and new technological opportunities are discussed.
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