TY - JOUR
T1 - Selection of healing agents for autonomous healing of alumina at high temperatures
AU - Boatemaa, Linda
AU - Kwakernaak, C.
AU - van der Zwaag, Sybrand
AU - Sloof, Willem G.
PY - 2016
Y1 - 2016
N2 - To date, the research aimed at creating a high-temperature alumina (Al2O3) grade capable of autonomously repairing crack damage focussed on the use of SiC particles which turns to SiO2 as the healing agent. The present work presents an unbiased selection procedure to determine other attractive substances and phases which could serve as an effective healing agent for healing at high temperatures. The selection process is based on an analysis of the requested characteristics of the oxide to fill the crack (melting point, adhesion to the alumina matrix and thermal mismatch) as well as those of the healing agent prior to being activated (melting point, volume expansion upon oxidation and thermal mismatch). Application of all selection criteria resulted in identifying granular Ti, Cr, Zr, Nb, Hf, TiC, TiN, Cr3C2, Cr2N, ZrN, NbC and NbN as promising agents for autonomous healing of alumina when used in air at high temperatures.
AB - To date, the research aimed at creating a high-temperature alumina (Al2O3) grade capable of autonomously repairing crack damage focussed on the use of SiC particles which turns to SiO2 as the healing agent. The present work presents an unbiased selection procedure to determine other attractive substances and phases which could serve as an effective healing agent for healing at high temperatures. The selection process is based on an analysis of the requested characteristics of the oxide to fill the crack (melting point, adhesion to the alumina matrix and thermal mismatch) as well as those of the healing agent prior to being activated (melting point, volume expansion upon oxidation and thermal mismatch). Application of all selection criteria resulted in identifying granular Ti, Cr, Zr, Nb, Hf, TiC, TiN, Cr3C2, Cr2N, ZrN, NbC and NbN as promising agents for autonomous healing of alumina when used in air at high temperatures.
KW - Alumina
KW - High temperature
KW - Self-healing
KW - Thermal residual stress
KW - Volume expansion
UR - http://www.scopus.com/inward/record.url?scp=84996549541&partnerID=8YFLogxK
U2 - 10.1016/j.jeurceramsoc.2016.05.038
DO - 10.1016/j.jeurceramsoc.2016.05.038
M3 - Article
AN - SCOPUS:84996549541
SN - 0955-2219
VL - 36
SP - 4141
EP - 4145
JO - Journal of the European Ceramic Society
JF - Journal of the European Ceramic Society
IS - 16
ER -