Patent ID: 11964900
Assignee: SAINT-GOBAIN CENTRE DE RECHERCHES ET D'ETUDES EUROPEEN
Field: Materials, metallurgy (Chemistry)
Classification: CPC C | IPC C

Claim 0:
1. Fused tuckstone having a lower surface and an upper surface,
the lower surface comprising:
a support surface intended to rest on a metallic structure of a glass furnace,
a tank surface intended to face an upper edge of a tank of said glass furnace, and
a lower transition surface connecting the support surface and the tank surface,

and the upper surface comprising:
a superstructure surface intended to receive a side wall of a superstructure of said glass furnace, and
an upper transition surface connecting the superstructure surface and the lower surface,

said fused tuckstone being characterized in that at least a part of the lower transition surface has a crystal density of more than four times the crystal density at a depth of 4 centimeters below said lower transition surface, such a surface being described as a surface with “skin microstructure”, a crystal density being evaluated by the number of crystals having a surface area of more than 12 μm2 per mm2 of surface after polishing, the crystal density at said depth being evaluated over the surface exposed after cutting of the fused tuckstone to said depth.