Stress corrosion cracking of a BaTiO{3} ferroelectric ceramics
BaTiO3铁电陶瓷的应力腐蚀

Stress corrosion cracking (SCC) or static fatigue fracture of a BaTiO$_{3}$ ferroelectric ceramics in moist atmosphere, water, silicon oil and formamide was investigated at constant load test using a single--edge notched tensile specimen. The result showed that SCC could occur in these four environments. The fracture surface overloaded in air is transgranular brittle fracture, and the fracture surfaces of SCC in moist atmosphere, water, silicon oil and formamide are mainly transgranular but there is a small intergranular region. The normalized threshold stress intensity factor of SCC was 0.78(in air), 0.63(in water), 0.66(in silicon oil) and 0.82 (in formamide), respectively, and the fracture toughness is 1.29$\pm$0.14 MPa$\cdot$m$^{1/2}$.