Room temperature strength and microstructure of Si3N4-Y2O3-ZrO2-Al2O3 ceramics
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説明
Abstract Si3N4-(0–24)mol.% Y2O3- (0–27)mol.%ZrO2-(4.0–4.6)mol.%Al2O3 compacts were sintered in nitrogen gas at 0.5 MPa and 2073 K for 7.2 ks. The room temperature mechanical properties, and in particular the transverse-rupture strength (TRS), were investigated in relation to the Y2O3 and ZrO2 contents. It was found that the compact showed a high strength of about 0.7 MPa in the composition range of low Y2O3, low to high ZrO2 or low to medium Y2O3+ZrO2 contents, and it showed a low strength of about 0.45–0.55 GPa in the other composition ranges. The dependences of both fracture toughness and hardness on the composition were nearly the same as that of the TRS. The low values of TRS in the above composition range were discussed in relation to the microstructure.
収録刊行物
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- Materials Science and Engineering: A
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Materials Science and Engineering: A 105-106 175-182, 1988-11-01
Elsevier BV