TY - JOUR
T1 - Low-temperature oxidation-induced crack healing in Ti2Al0.5Sn0.5C–Al2O3 composites
AU - Bei, Guoping
AU - Mačković, Mirza
AU - Spiecker, Erdmann
AU - Greil, Peter
PY - 2019
Y1 - 2019
N2 - The oxidation-induced crack healing of an Al2O3 composite loaded with various volume fractions of Ti2Al0.5Sn0.5C repair filler particles was investigated by annealing in air at a relatively low temperature of 700°C. After annealing a composite with 20 vol.% repair fillers (with a particle size of ~5.6 µm) for 48 hours, artificial indentation cracks prepared on the surface, as well as pores near the surface, were completely healed by filling with condensed oxidation products. Additionally, minor fraction of metallic Sn was detected. A complementary study by X-ray diffraction, transmission electron microscopy, scanning electron microscopy, and energy dispersive X-ray spectroscopy revealed that nano-sized oxidation products (SnO2, TiO2, and α-Al2O3 phase) were formed as major crack-filling species. After healing, the strength recovery of the Al2O3 composites was significantly improved in the composites loaded with more than 10 vol.% repair fillers and achieved 107% at 700 for 48 hours.
AB - The oxidation-induced crack healing of an Al2O3 composite loaded with various volume fractions of Ti2Al0.5Sn0.5C repair filler particles was investigated by annealing in air at a relatively low temperature of 700°C. After annealing a composite with 20 vol.% repair fillers (with a particle size of ~5.6 µm) for 48 hours, artificial indentation cracks prepared on the surface, as well as pores near the surface, were completely healed by filling with condensed oxidation products. Additionally, minor fraction of metallic Sn was detected. A complementary study by X-ray diffraction, transmission electron microscopy, scanning electron microscopy, and energy dispersive X-ray spectroscopy revealed that nano-sized oxidation products (SnO2, TiO2, and α-Al2O3 phase) were formed as major crack-filling species. After healing, the strength recovery of the Al2O3 composites was significantly improved in the composites loaded with more than 10 vol.% repair fillers and achieved 107% at 700 for 48 hours.
KW - AlO-MAX phase composites
KW - oxidation products
KW - oxidation-induced crack healing
KW - strength recovery
UR - http://www.scopus.com/inward/record.url?scp=85068027681&partnerID=8YFLogxK
U2 - 10.1111/ijac.13315
DO - 10.1111/ijac.13315
M3 - Article
AN - SCOPUS:85068027681
SN - 1546-542X
VL - 16
SP - 1744
EP - 1751
JO - International Journal of Applied Ceramic Technology
JF - International Journal of Applied Ceramic Technology
IS - 5
ER -