Effect of Cr₂O₃ on the crystallization, structure, and properties of Ti-bearing blast furnace slag-based glass ceramics

Abstract

The effects of Cr 2 O 3 on the crystallization, structure, and properties of Ti-bearing blast furnace slag-based glass ceramics were investigated. The results show that the transition temperature and crystallization temperature decreased with introduction of Cr 2 O 3 as a while. Specifically, the crystallization temperature first decreased, then increased with the increase Cr 2 O 3 concentration from 0.2 wt% to 0.8 wt%, and finally decreased with further increased in Cr 2 O 3 concentration. The crystal phases were identified as anorthite, diopside, and akermanite. As the content of Cr 2 O 3 increased to 0.8 wt%, the dendrites gradually decreased and the granular crystals gradually increased. When the Cr 2 O 3 concentration further increased, the number of granular crystals gradually decreased and the dendrites gradually accumulated. With the increase of Cr 2 O 3 from 0.2 wt% to 0.8 wt%, the structure of the investigated glass gradually depolymerized, while the opposite trend was presented with further increased in Cr 2 O 3 content. With increasing Cr 2 O 3 content from 0.2 wt% to 2 wt%, the flexural strength values and Vickers hardness values of the glass ceramics first increased and then decreased, and the maximum values of flexural strength and Vickers hardness were obtained as 94.371MPa and 974.43MPa, respectively. The prepared Ti-bearing blast furnace slag-based glass ceramics showed good acid and alkali resistance.

Research Progress on Iron- and Steelmaking Iste Slag-Based Glass-Ceramics: Preparation and GHG Emission Reduction Potentials

“…When the Cr 2 O 3 content increases from 0.2 wt% to 0.8 wt%, the dendrites in BFS-based glass-ceramics gradually decrease, while the granular crystals gradually increase until the dendrites almost become granular crystals (less than 1 µm). When the concentration of Cr 2 O 3 is more than 0.8 wt%, the number of granular crystals gradually decreased, while dendrites gradually accumulated [2]. The conclusions of these two studies are similar, and both indicate that higher Cr 2 O 3 content is beneficial to the accumulation of the host phase diopside.…”

“…The above studies show that adding a certain amount of Cr 2 O 3 could effectively promote crystallization. In addition, the variation of Cr 2 O 3 content would induce the transformation of the crystallization mode of the basic glass, from two-dimensional crystal to three-dimensional crystal, and dendrites are gradually refined [2]. For example, CMAS-Cr 2 O 3 glass-ceramics is prepared with BFS as the main raw material.…”

Preparation and properties of the glass‐ceramics from low Ti‐bearing blast furnace slag and waste glass

“…The main influencing factors affecting this process include chemical composition and heat treatment. [16][17][18][19] Previous studies claimed that SiO 2 is the primary oxide in silicate glass, and the glass structure featured a significant impact on the material properties. 20,21 CaO act as a network modifier in the silicate network, which can destroy the bridge oxygen bond of Si-O-Si units.…”

“…The crystallization behavior of the basic glass is mainly affected by nucleation and crystal growth. The main influencing factors affecting this process include chemical composition and heat treatment 16–19 . Previous studies claimed that SiO 2 is the primary oxide in silicate glass, and the glass structure featured a significant impact on the material properties 20,21 .…”