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Influence of the Active Particles on the Self‐Healing Efficiency in Glassy Matrix
Author(s) -
Coillot Daniel,
Méar François O.,
Podor Renaud,
Montagne Lionel
Publication year - 2011
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201100002
Subject(s) - thermogravimetric analysis , environmental scanning electron microscope , materials science , scanning electron microscope , diffusion , particle (ecology) , self healing , oxide , composite material , matrix (chemical analysis) , vanadium , chemical engineering , metallurgy , thermodynamics , oceanography , physics , alternative medicine , engineering , geology , medicine , pathology
In the present paper, we present the influence of the composition of the active particles on the self‐healing property in glass–particles (B, B 4 C, VB, V, or VC) composites. The thermogravimetric curves and oxidation kinetics at 700 °C of the active particles are reported. We show that the oxidation rate is higher with vanadium‐based particles than with boron‐base ones, mainly due to the formation of B 2 O 3 that acts as a diffusion barrier to oxygen. In situ healing of cracks in composites was observed using high‐temperature environmental scanning electron microscopy (HT‐ESEM). The composition of the phases formed by reaction between the oxidation products and the glassy matrix is systematically determined. Self‐healing occurs as a consequence of oxidation of active particles, which leads to the formation of an oxide, such as V 2 O 5 and/or B 2 O 3 that is fluid enough to fill in the crack at high temperature. The crack healing is obtained whatever the nature of the active particle.