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《Journal of The Chinese Ceramic Society》 1980-03
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Zhang Qing-chun;Lin Su-zhen Shanghai Institute of Ceramics,Academia Sinica  
Most of the ceramic materials, because of their inherent brittleness, are susceptible tothermal stress fracture. According to fracture mechanics theory, thermal stress fracture includ-es processes of flacture intiation as well as of continued crack propagation.of the two,crack propagation is more detrimental.It has been proposed that crack propagation occurs kinetically with total area of crack propagation inversly proportional to thermal shock re-sistance parameter, e. g.R≌(K_(1c)/σ_f)~2, where K_(1c) is the critical stress intensity factor,σ_f, isthe tensile strength. In order to investigate this relationship,the critical stress intensity factor and the ther-mal shock resistance parameter of three types of alumina ceramics with different micro-structures were compared with their strength losses over a wide range of quenching tempe-rature difference (200℃ΔT1200℃) .Because of their structural weakening at grain boun-daries, type T-Al_2O_3 samples, which fracture almost in a completely intercrystallilae man-ner, have strength values considerably lower than those of type P-Al_2O_3 and type Ⅱ-95-Al_2O_3 samples. Nevertherless, their K_(1c) values are somewhat higher than those of type Ⅱ-95-Al_2O_3.This can be explained by energy dissipation at such grain boundaries. Their result-ing high R values coincide with the small degradation of strength in quenching. The highstrength value and low K_(1c) value of type Ⅱ-95-Al_2O_3 samples, which fracture mainlytranscrystallinely, indicate a low value of R and a consequent high strength loss in quench-ing. The relatively high K_(1c) value, together with the high strength value of type P-Al_2O_3samples produce an intermediate R value, corresponding to certain degradation of strengthin quenching. Apparently, for brittle ceramics the value of R could be the criterion for estimation ofthe relative change in strength which is a function of thermal shock.It is recommendedthat the critical stress intensity factor K_(1c), as well as the strength value σ_f, be determinedas a routine laboratory practice in the production and development of n?aterials.
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