セラミック粉末成形体の機械的性質(<小特集>セラミック材料小特集)

概要

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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 (σ_f), effective fracture energy (γ_<eff>), Young's modulus (E_s), and fracture toughness (K_<Ic>), were determined for dried clay as 6.8MPa, 4.9J/m^2, 1.6 GPa, and 0.19MN/m^<3/2>, respectively. On the other hand, the parameters for alumina powder compacts changed with the addition of a binding agent methyl cellulose (MC). Their σ_f and Weibull modulus (m) showed the maximum values at 1 wt% MC, and with increasing MC content, γ_<eff> increased linearly but K_<Ic> 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.
社団法人日本材料学会の論文
1983-11-15