Fabrication of Composite in the System ZrO₂ (2Y)/Wsi₂ Part I

Microstructures and Mechanical Properties of the Composites in the Wsi₂ Rich Region

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Dense sintered composites of ZrO₂(2 mol% Y₂O₃) and WSi₂ have been fabricated by hot isostatic pressing for 2 h at 1500°C under 196 MPa. They contain a small amount of W₅Si₃; during sintering, WSi₂ decomposes into W₅Si₃ and amorphous Si. The ZrO₂ particles in the composites consist of only t-ZrO₂. Microstructures and mechanical properties are examined, in connection with ZrO₂ content. The fracture toughness and bending strength of the composite with 40 mol% ZrO₂ addition are 7.1 MPa⋅m^1/2 and 1010 MPa, respectively.