62592 2025 eng 1 10 article Wiley 1 -- -- -- To ensure the durability of solid oxide fuel cell sealants, the understanding of the microstructural influence on viscous crack healing is essential. To this end, the effect of microstructure with respect to the spatial distribution of filler particles on viscous crack healing was studied with confocal laser scanning microscopy in glass-matrix composites (GMCs) made by mix-milling and sintering of sodalime magnesium silicate glass and Φ ≈ 6 vol% ZrO2 chemically inert rigid filler particles. This way, no change in Φ occurred during the crack healing treatments studied on Vickers indentation-induced radial cracks in polished GMC surfaces. Different microstructures were mimicked using different ZrO2 particle sizes for mix-milling. Unlike coarse ZrO2 particles, similar in size to the glass particle, fine ZrO2 particles, much smaller than the glass particles, form a rigid percolation framework (RPF) of ZrO2 filler particles around the former glass particles or glass particle agglomerates. For this RPF microstructure, crack healing was observed more readily as crack healing retardation phenomena like large-scale crack widening and crack tip rounding were strongly reduced, whereas narrow cracks could still heal locally within the glassy regions. Journal of the American Ceramic Society 0002-7820 10.1111/jace.20386 urn:nbn:de:kobv:b43-625921 publish 24.02.205 false true Creative Commons - CC BY - Namensnennung 4.0 International Carsten Blaeß Ralf Müller eng uncontrolled Crack healing eng uncontrolled Glass matrix composite eng uncontrolled Rigid percolation frameworks eng uncontrolled Vickers indentation Ingenieurwissenschaften und zugeordnete Tätigkeiten 5 Werkstofftechnik 5.6 Glas Material Verlagsliteratur Datei für die Öffentlichkeit verfügbar ("Open Access") Wissenschaftliche Artikel der BAM Materialdesign Bundesanstalt für Materialforschung und -prüfung (BAM) https://opus4.kobv.de/opus4-bam/files/62592/2025 Blaess Fast crack healing in glass matrix composites with rigid filler.pdf