High‐temperature performance of two‐layered ceramics and the implications for Roman crucibles. (19th August 2020)

• Record Type: Journal Article
• Authors: Gardner, Carlotta; Müller, Noémi S.; Vekinis, George; Freestone, Ian C.; Kilikoglou, Vassilis
• Is Part Of: Archaeometry. Volume 62:Number 5(2020)
• Page Start: 935
• Page End: 951
• Publication Date: 2020-08-19
• Subjects: Roman crucibles -- multilayer ceramics -- mechanical properties -- high‐temperature performance; Archaeometry -- Periodicals; Archaeology -- Expertising -- Periodicals; 930.1
• DOI: 10.1111/arcm.12569
• Languages: English
• ISSNs: 0003-813X

Abstract

Abstract : Roman metalworking crucibles are frequently characterized by an extra outer layer of clay, applied to a pre‐formed vessel. Three‐point bending and standardized dead‐weight loading tests were conducted to determine the advantages offered by the extra outer layer. Deformation and fracture behaviour, at temperatures up to 1100°C, of two‐layer, monolithic and tempered‐monolithic briquettes were compared. Measurements indicated that the two‐layer briquettes were more resistant to fracture at high temperatures: > 850°C they showed more extensive plastically deformed regions than monolithic briquettes. The influence of temper was consistent with previous results: tempering caused quasi‐stable fracture and reduced fracture strength. The results suggest extra outer layers assisted in preventing catastrophic failure.