Ambient temperature fracture strength of pure alumina

Flexural strength evaluations and fractography analyses of slip cast mesoporous submicron alumina

“…Consequently, the flexural strength in 1400 °C sintered samples is slightly higher than that of 1500 °C sintered batch. This is in accordance with literature, which suggests an increase in the flexural strength for a decrease in the grain diameter [8,10,11,16,[33][34][35]. On the other hand, although, the samples sintered at 1300 °C and 1350 °C have smaller grain sizes than 1400 °C sintered batch, but possess higher total porosity fractions of 6.7±2.6 % and 5.2±2.6 % respectively, which resulted in smaller flexural strength values.…”

“…It is known that the porosity fraction [17][18][19][20], the average pore size [14] and distributions [1], the grain morphology [8], [9], [10], the sample fabrication procedure [11], and the sample surface finish prior to bending experiments [5,9,27,28] are the critical influencing factors in determining the flexural strength of brittle ceramics. In this study, the sample fabrication procedure and the sample surface finish were kept constant.…”

“…Flexural strength (σ) data of alumina materials are widely available, and depend on the pore fraction [1], grain morphology [1], [6], purity, crystallographic orientation [7] and fabrication techniques [8], [9], [10], [11], [12], [13]. Many research efforts were put forth to evaluate flexural strength of equiaxed fully dense α−Al2O3 samples for varying grain sizes between 1 µm and 250 µm [6], [8].…”

“…Many research efforts were put forth to evaluate flexural strength of equiaxed fully dense α−Al2O3 samples for varying grain sizes between 1 µm and 250 µm [6], [8]. A variety of fabrication routes such as hot pressing [8], [10], [11], hot isostatic pressing [11], cold pressing followed by sintering [9] and slip casting followed by sintering [12], [14], [15] were employed in those studies. Limited literature is available on the flexural strength of non-equiaxed fully dense α−Al2O3 samples [9].…”

“…Limited literature is available on the flexural strength of non-equiaxed fully dense α−Al2O3 samples [9]. Although, it has been well established that flexural strength increases with a decrease in the grain size [8], [9], [10], [11], very limited literature is available on the flexural strength of fine grained fully dense α−Al2O3 samples [16].…”