Pore formation in glass–ceramics: Influence of the stress energy distribution

Variation of Avrami parameter during non-isothermal surface crystallization of glass powders with different sizes

“…This additional porosity is a consequence of the significant density difference between the parent glass and the newly formed crystal phase and of the huge increase of apparent viscosity due to the crystallization. Recently, several experimental results [21][22][23][24][25] and theoretical approaches [26,27] related to the phenomenon of P CR formation were published.…”

A continuum thermo-inelastic model for damage and healing in self-healing glass materials

“…In contrast, continuum phenomenological description, as a homogenization of the underlying microscopic aspects, provides a numerically efficient alternative to project the most relevant microstructure morphological features onto the macroscopic field (Krajcinovic, 1996;Lemaitre, 1992; Lemaitre and Chaboche, 1985). Mechanical degradation interpreted as the damage density was measured based on the reduction of elastic modulus (Bonora et al, 2005;Brunig, 2003;Horstemeyer and Bammann, 2010;Sciarra, 2012;Voyiadjis and Kattan, 2009;Voyiadjis et al, 2004), where the postcritical behavior of the materials was characterized by the evolution of internal variables that denote the accumulation of inherent imperfections such as mechanically induced cracks and internal pores (Doquet et al, 2013;Karamanov et al, 2010). Further observations and analyses suggest that the multiple physical kinetics involved in the degradation process seldom coincide (Hammi and Horstemeyer, 2007;Lecarme et al, 2011).…”

Microstructure transformation of a crystallized glass from the system BaO‐SrO‐ZnO‐SiO2

“…However, this assumption was not experimentally proven. Stress induced pore formation, as it is known from wollastonite, or diopside glass‐ceramics is improbable 23–25 …”

“…Stress induced pore formation, as it is known from wollastonite, or diopside glassceramics is improbable. [23][24][25] From the tomograms, it can also be seen that a microstructure coarsening takes place with increasing temperature. In order to quantify this coarsening, a strut thickness analysis was performed as illustrated in Figure 11 for a pillar after a heat treatment at 925 shows the strut thickness distribution with an inset displaying the mean strut thicknesses as well as the maximum values.…”