Standard

Self-healing of Al2O3 containing Ti microparticles. / Boatemaa, L.; van der Zwaag, S.; Sloof, W. G.

In: Ceramics International, Vol. 44, No. 10, 2018, p. 11116-11126.

Research output: Contribution to journalArticleScientificpeer-review

Harvard

APA

Vancouver

Author

Boatemaa, L. ; van der Zwaag, S. ; Sloof, W. G. / Self-healing of Al2O3 containing Ti microparticles. In: Ceramics International. 2018 ; Vol. 44, No. 10. pp. 11116-11126.

BibTeX

@article{178f5140b6f24b3bb7a6303100f107f1,
title = "Self-healing of Al2O3 containing Ti microparticles",
abstract = "This work explores the possibility of using embedded micron-sized Ti particles to heal surface cracks in alumina and to unravel the evolution of the crack filling process in case of pure solid-state oxidation reactions. The oxidation kinetics of the Ti particles is studied and the results are applied in a simple model for crack-gap filling. An activation energy of 136 kJ/mol is determined for the oxidation of the Ti particles having an average particle size of 10 µm. The almost fully dense alumina composite containing 10 vol{\%} Ti has an indentation fracture resistance of 4.5 ± 0.5 MPa m1/2. Crack healing in air is studied at 700, 800 and 900 °C for 0.5, 1, and 4 h and the strength recovered is measured by 4-point bending. The optimum healing condition for full strength recovery is 800 °C for 1 h or 900 °C for 15 min. Crack filling is observed to proceed in three steps i.e., local bonding at the site of an intersected Ti particle, lateral spreading of the oxide and global filling of the crack. It is discovered that, although significant strength recovery can be attained by local bonding of the intersected particles, full crack filling is required to prevent crack initiation from the damaged region upon reloading. The experimental results observed are in good agreement with the predictions of a simple discrete crack filling/healing model.",
keywords = "Alumina composite, High temperatures, Isothermal oxidation, Self-healing, Titanium",
author = "L. Boatemaa and {van der Zwaag}, S. and Sloof, {W. G.}",
year = "2018",
doi = "10.1016/j.ceramint.2018.03.119",
language = "English",
volume = "44",
pages = "11116--11126",
journal = "Ceramics International",
issn = "0272-8842",
publisher = "Elsevier",
number = "10",

}

RIS

TY - JOUR

T1 - Self-healing of Al2O3 containing Ti microparticles

AU - Boatemaa, L.

AU - van der Zwaag, S.

AU - Sloof, W. G.

PY - 2018

Y1 - 2018

N2 - This work explores the possibility of using embedded micron-sized Ti particles to heal surface cracks in alumina and to unravel the evolution of the crack filling process in case of pure solid-state oxidation reactions. The oxidation kinetics of the Ti particles is studied and the results are applied in a simple model for crack-gap filling. An activation energy of 136 kJ/mol is determined for the oxidation of the Ti particles having an average particle size of 10 µm. The almost fully dense alumina composite containing 10 vol% Ti has an indentation fracture resistance of 4.5 ± 0.5 MPa m1/2. Crack healing in air is studied at 700, 800 and 900 °C for 0.5, 1, and 4 h and the strength recovered is measured by 4-point bending. The optimum healing condition for full strength recovery is 800 °C for 1 h or 900 °C for 15 min. Crack filling is observed to proceed in three steps i.e., local bonding at the site of an intersected Ti particle, lateral spreading of the oxide and global filling of the crack. It is discovered that, although significant strength recovery can be attained by local bonding of the intersected particles, full crack filling is required to prevent crack initiation from the damaged region upon reloading. The experimental results observed are in good agreement with the predictions of a simple discrete crack filling/healing model.

AB - This work explores the possibility of using embedded micron-sized Ti particles to heal surface cracks in alumina and to unravel the evolution of the crack filling process in case of pure solid-state oxidation reactions. The oxidation kinetics of the Ti particles is studied and the results are applied in a simple model for crack-gap filling. An activation energy of 136 kJ/mol is determined for the oxidation of the Ti particles having an average particle size of 10 µm. The almost fully dense alumina composite containing 10 vol% Ti has an indentation fracture resistance of 4.5 ± 0.5 MPa m1/2. Crack healing in air is studied at 700, 800 and 900 °C for 0.5, 1, and 4 h and the strength recovered is measured by 4-point bending. The optimum healing condition for full strength recovery is 800 °C for 1 h or 900 °C for 15 min. Crack filling is observed to proceed in three steps i.e., local bonding at the site of an intersected Ti particle, lateral spreading of the oxide and global filling of the crack. It is discovered that, although significant strength recovery can be attained by local bonding of the intersected particles, full crack filling is required to prevent crack initiation from the damaged region upon reloading. The experimental results observed are in good agreement with the predictions of a simple discrete crack filling/healing model.

KW - Alumina composite

KW - High temperatures

KW - Isothermal oxidation

KW - Self-healing

KW - Titanium

UR - http://resolver.tudelft.nl/uuid:178f5140-b6f2-4b3b-b7a6-303100f107f1

UR - http://www.scopus.com/inward/record.url?scp=85045659461&partnerID=8YFLogxK

U2 - 10.1016/j.ceramint.2018.03.119

DO - 10.1016/j.ceramint.2018.03.119

M3 - Article

VL - 44

SP - 11116

EP - 11126

JO - Ceramics International

T2 - Ceramics International

JF - Ceramics International

SN - 0272-8842

IS - 10

ER -

ID: 44889083