KZr_2(PO_4)_3セラミックの熱衝撃抵抗の粒径依存性

概要

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Thermal shock fracture behavior of KZr_2 (PO_4)_3 ceram ic, which has a near zero thermal expansion coefficient, was evaluated by the water quenching test. The specimens having almost the same density, strength, Young's modulus, and thermal expansion coefficient, but different grain sizes, were prepared by adjusting the sintering conditions. The maxinmm tem perature difference (ΔT_<max>) ' to which the specimens were subjected without failure in the thermal quench test, increased with decreasing grain size. KZr_2 (PO_4)_3 ceramic composed of fine grains<3 μm withstood the test without lowering of strength even when quench ing from 1300℃ into water was repeated 20 times. The grain size dependence of Δ T_<max> has been attributed to residual stress caused by the thermal expansion anisotropy. As a result, grain size and thermal expan sion anisotropy were incorporated into the equation for the thermal shock resistance.
社団法人日本セラミックス協会の論文
1994-08-01