Crystallisation behaviour and high-temperature stability of stone wool fibres

Surface modification of polyvalent element-containing glasses

“…The results obtained in this study indicate that the nano-crystalline layer lowers the activation energy for crystallization since the crystals can grow from the nuclei that are already formed at the surface. This agrees with the results of previous studies, in which it has been shown by DSC experiments that the crystallization starts at the surface when the nano-crystalline surface layer is present [31,32].…”

Inward and Outward Diffusion of Modifying Ions and its Impact on the Properties of Glasses and Glass–Ceramics

“…The nanolayer influences the bulk crystallization in the manner that it lowers the crystallization onset temperature, the activation energy, and the Avrami parameter. Such influence benefits the enhancement of the HTS 49 …”

“…Such influence benefits the enhancement of the HTS. 49 When the fibers undergo a heat treatment at temperatures around T g in a reducing H 2 /N 2 atmosphere, it has a significant impact on the glass transition and crystallization behavior, HTS, and chemical durability of the fibers. The glass transition temperature decreases and the crystallization onset temperature increases when the glass fibers are reduced and subsequently heated in argon (left panel in Fig.…”

Melting behaviour of raw materials and recycled stone wool waste

“…Another study shows that sieving allows fibers to pass through a 63 µm m sieve [18], indicating that it is in fact the diameter of the fibers that influences the particle size distribution presented on Figure 1. The glass transition temperature and crystallization onset of stone wool depend on the specific chemical composition of the wool [15], this is therefore also expected to be the case for the melting temperature of the formed crystal phases, however data obtained on stone wool of slightly different chemistries will still provide useful knowledge of the expected melting temperatures. Stone wool fibers are studied thoroughly with the focus on uncovering the mechanisms behind the high temperature stability of the fibers [15,16,17,18,19].…”

“…The glass transition temperature and crystallization onset of stone wool depend on the specific chemical composition of the wool [15], this is therefore also expected to be the case for the melting temperature of the formed crystal phases, however data obtained on stone wool of slightly different chemistries will still provide useful knowledge of the expected melting temperatures. Stone wool fibers are studied thoroughly with the focus on uncovering the mechanisms behind the high temperature stability of the fibers [15,16,17,18,19]. These investigations show the stone wool fibers crystallize when heated above 1120 K, explaining why stone wool products keep their shape when exposed to high temperatures up until melting initiates at 1375-1425 K [16], [17].…”