Fracture toughness of a partially stabilized ZrO$sub 2$ in the system CaO-- ZrO$sub 2$

Journal Article · Sat Dec 01 04:00:00 EST 1973 · J. Amer. Ceram. Soc., v. 56, no. 12, pp. 619-623

OSTI ID:4309341

Green, D J; Nicholson, P S; Embury, J D

The room-temperature fracture behavior of partially stabilized ZrO/sub 2/ (PSZ) in the system CaO-- ZrO/sub 2/ was investigated. Fracture energy was measured using stsndard single-edge-crack and work-of-fracture techniques. Attempts were made to relate the fracture toughness parameters to the microstructure of the material. Stable crack propagation was always observed; a model is proposed to explain these observati ons on the basis of the formati on of a microcrack zone at the tip of a propagating crack. The occurrence of initial stable crack propagation is explained in terms of an increase in microcrack zone size. The possibility that crack stability results from testing geometry superimposed on the microcracking stability is also discussed. (auth)

• Research Organization: McMaster Univ., Hamilton, Ont.
• NSA Number: NSA-29-024637
• OSTI ID: 4309341
• Journal Information: J. Amer. Ceram. Soc., v. 56, no. 12, pp. 619-623, Journal Name: J. Amer. Ceram. Soc., v. 56, no. 12, pp. 619-623; ISSN JACTA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

*CALCIUM OXIDES-- FRACTURE PROPERTIES
*ZIRCONIUM OXIDES-- FRACTURE PROPERTIES
CRACKS
MEDIUM TEMPERATURE
MICROSTRUCTURE
N50130* --Metals
Ceramics
& Other Materials--Ceramics & Cermets--Properties
Structure & Phase Studies
STABILITY