Abstract
This chapter investigates the delayed fracture of lead-zirconate-titanate (PZT-5) ferroelectric ceramics under an applied constant load in a solution or during dynamic hydrogen charging. It also examines the effect of an applied sustained electric field on stress corrosion cracking (SCC) of PZT-5 ferroelectric ceramics. The fracture surfaces of specimens are examined with scanning electron microscopy. During dynamic hydrogen charging under an applied constant load, hydrogen can delay fracture of PZT-5 ferroelectric ceramics. The threshold stress intensity factor decreases linearly with the logarithm of hydrogen concentration C0. The threshold stress intensity factor of hydrogen-induced cracking (HIC) reveals anisotropy for the specimens with different poling directions. The normalized threshold stress intensity factor of HIC does not reveal anisotropy. SCC of PZT-5 ferroelectric ceramics occurs in water, silicone oil, formamide, and humid air. It also exhibits anisotropy in the threshold stress intensity factor of SCC. Positive and negative electric fields have identical effects on apparent fracture toughness, and both decrease the apparent threshold stress intensity factor of SCC in silicone oil.
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