抄録
In order to investigate the mechanical behaviour of ceramic green bodies, the specimens of dried clay and alumina powder compacts were fractured by the three points bending technique. The values of fracture mechanics parameters, such as bending strength (σf), effective fracture energy (γeff), Young's modulus (Es), and fracture toughness (KIc), were determined for dried clay as 6.8MPa, 4.9J/m2, 1.6GPa, and 0.19MN/m3/2, respectively. On the other hand, the parameters for alumina powder compacts changed with the addition of a binding agent methyl cellulose (MC). Their σf and Weibull modulus (m) showed the maximum values at 1wt% MC, and with increasing MC content, γeff increased linearly but KIc hardly increased. The relations between the fracture mechanics parameters obtained and the behaviour of ceramic powder compacts during processing (cutting, drilling, and handling) were discussed in this report.
