Ordnad sammanväxt av nanokristaller och uppmjukning av korngräns i glasmatriskeramer
Tidsperiod: 2020-12-01 till 2024-11-30
Projektledare: Wei Xia
Budget: 4 064 000 SEK
Transparent, tough glassy material is a long-held goal of ceramic researchers. Our recent discovery, that a newly developed glass matric ceramic (GMC) has the highest flexural strength by controlling its 3D crystal microstructure, opens a new perspective for microstructure engineering and thus to enhance physical properties of a broad family of nanocrystalline glass-ceramics (GC). Unlike conventional approaches for strengthening glassy materials, our strategy is focused on the design of an ordered coalescence of single-crystalline nanoceramic to distribute internal stress. The overall objective of this project is to establish a fundamental understanding of the phenomenon and the mechanisms of the ordered coalescence of nanocrystals during the sintering of GMC powders and toughening by softening grain boundary based on the 3D nanostructure. In this project, we are attempting to make a breakthrough in the development of ultra-strong transparent GMC. The ordered coalescence, the kinetics of coalescence of nanocrystals and the influence of the coalescence of nanocrystals on grain growth and final mechanical strength, respectively, will be studied. The coalescence of nanocrystals in the glass matrix will be modulated from random to ordered and could contribute to the knowledge of residual stress and strengthening. The possibility to utilize the discovery will be explored to prepare bulk GC nanocomposites with novel and/or improved properties.