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High‐temperature performance of two‐layered ceramics and the implications for Roman crucibles
Author(s) -
Gardner Carlotta,
Müller Noémi S.,
Vekinis George,
Freestone Ian C.,
Kilikoglou Vassilis
Publication year - 2020
Publication title -
archaeometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.716
H-Index - 67
eISSN - 1475-4754
pISSN - 0003-813X
DOI - 10.1111/arcm.12569
Subject(s) - materials science , fracture (geology) , tempering , layer (electronics) , ceramic , composite material , metallurgy , deformation (meteorology) , bending , briquette , archaeology , coal , history
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.