Fracture of translucent alumina: temperature dependence and influence of CaO dope

G. de With

doi:10.1007/BF01058095

Fracture of translucent alumina: temperature dependence and influence of CaO dope

G. de With

Research output: Contribution to journal › Article › Academic › peer-review

20 Citations (Scopus)

Abstract

The influence of CaO on the mechanical behaviour of translucent, MgO-doped Al₂O₃ ceramics has been investigated, using alumina both without and with added CaO. The addition of only 40 wt ppm CaO drastically changed the microstructure, resulting in an increase of optical transmission, which was the purpose of the addition. Strength (∼300 MPa) and fracture toughness (∼3.7 MPa m^1/2), however, as measured at room temperature, decreased by 30% and 10%, respectively, while the resistance to slow crack growth increased slightly. Toughness as well as strength, showed a relative decrease with temperature of about 3×10^-4 K^s-1. The results are discussed and compared with available literature data.

Original language	English
Pages (from-to)	2195-2202
Number of pages	8
Journal	Journal of Materials Science
Volume	19
Issue number	7
DOIs	https://doi.org/10.1007/BF01058095
Publication status	Published - 1 Jul 1984
Externally published	Yes

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abstract = "The influence of CaO on the mechanical behaviour of translucent, MgO-doped Al2O3 ceramics has been investigated, using alumina both without and with added CaO. The addition of only 40 wt ppm CaO drastically changed the microstructure, resulting in an increase of optical transmission, which was the purpose of the addition. Strength (∼300 MPa) and fracture toughness (∼3.7 MPa m1/2), however, as measured at room temperature, decreased by 30% and 10%, respectively, while the resistance to slow crack growth increased slightly. Toughness as well as strength, showed a relative decrease with temperature of about 3×10-4 Ks-1. The results are discussed and compared with available literature data.",

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AB - The influence of CaO on the mechanical behaviour of translucent, MgO-doped Al2O3 ceramics has been investigated, using alumina both without and with added CaO. The addition of only 40 wt ppm CaO drastically changed the microstructure, resulting in an increase of optical transmission, which was the purpose of the addition. Strength (∼300 MPa) and fracture toughness (∼3.7 MPa m1/2), however, as measured at room temperature, decreased by 30% and 10%, respectively, while the resistance to slow crack growth increased slightly. Toughness as well as strength, showed a relative decrease with temperature of about 3×10-4 Ks-1. The results are discussed and compared with available literature data.

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