Am. Ceram. Soc. Bull.; (United States) · 1976 · 28 citations · 0 references
EngineeringMaterials EngineeringNuclear EngineeringCeramic MaterialsCeramicsNuclear MaterialsCeramic Nuclear MaterialsCrystallization ProcessesGlass MaterialsThermodynamics Of CeramicsBorosilicate GlassesControlled CrystallizationCrystallizationGlass Thermal ExpansionGlass-ceramicsLeach ResistanceThermal ExpansionVitrified Waste
Spontaneous devitrification of fission-product-containing borosilicate glasses can be avoided by controlled crystallization after melting. Glass ceramics have been developed from a vitrified simulated waste and further improvement of product properties was achieved. In particular perovskite, h-celsian, diopside and eucryptite glass ceramics were prepared. These contained leach resistant host phases which exhibited considerable enrichment of long-lived fission products. All products showed increased impact resistance, but the thermal expansion was only slightly improved.