Glass‐Ceramic Composites from Borosilicate Glass and Alumina‐Rich Residues

Abstract

Valoxy, an alumina‐rich waste, was mixed with borosilicate glass (BSG) powder in 10, 20, and 30 wt% concentrations. Sintering was carried out at 850 and 950°C for 30 min. Glass‐ceramics (GC) were characterized by X‐ray diffraction analysis and scanning electron microscopy. Diametral compression strength (DCS) tests were performed on sintered samples before and after thermal shock. GC samples containing calcined Valoxy showed superior properties in all compositions and processing temperatures compared with samples containing as‐received Valoxy. Maximum density of 2.2 g/cm3, water absorption below 1 wt% and DCS of ~24MPa were measured for 10 wt% calcined Valoxy + BSG GC composites sintered at 850°C.

A one-step synthesis of rare-earth phosphate–borosilicate glass composites

“…The presence of crystalline SiO 2 is unwanted in a waste form and should be avoided because crystalline SiO 2 can undergo phase transformations at low temperatures, which leads to volume changes and the possibility of the waste form cracking. 29,39 No changes in the 2 θ positions of the diffraction peaks or changes in the intensity ratios of the diffraction peaks were observed, which suggests that little to no glass precursors were incorporated in the ceramic phase.…”

“…One type of synthesis involves a 2-step method where the ceramic and glass phases are synthesized separately before being mixed and then annealed to form a composite material. 12,16,[25][26][27][28][29] The high level waste stream would be added during the production of the ceramic phase which would ensure all the minor actinides would be partitioned into the ceramic phase. 27 A 1-step method is investigated here where all precursors are mixed together from the beginning followed by annealing.…”

Proving the role of boron in the structure of fly-ash/borosilicate glass based geopolymers

“…In this paper we present, for the first time, the introduction of recycled borosilicate glass (BSG) for geopolymer production. BSG is actually a glass residue, since it derives from dismantled pharmaceutical vials and cannot be reused in the manufacturing of the original articles [10]. Owing to the specific chemical composition (BSG is an ''alumino-boro-silicate"), however, it is conceived that BSG can provide the key components of zeolitic networks for geopolymer production, such as amorphous silica and alumina [11], as well as boria (B 2 O 3 ), which may replace Al 2 O 3 [12] and contribute to the polycondensation process.…”

Preparation and characterization of high chemical durability and low thermal expansion borosilicate glass-ceramics by recycling of borosilicate glass

“…To meet this challenge, different research groups attempted to recycle glass through the production of glass-ceramic composites. For instance, borosilicate glass-ceramic was prepared using different materials such as calcined Valoxy[17], Sr-cordierite[18] and, A12O3[19]. wt%).…”