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Abstract

A plain woven Al₂O₃ fibre - ZrO₂ minicomposite reinforced Al₂O₃ matrix composite ((Al₂O₃)_f/ZrO₂)_mc/Al₂O₃) has been fabricated by a simple, pressureless, multiple slurry infiltration - sintering process. The fabrication process consisted of two major steps: fabrication of the woven Al₂O₃ fibre - ZrO₂ minicomposite ((Al₂O₃)_f/ZrO₂)_mc) and fabrication of the composite ((Al₂O₃)_f/ZrO₂)_mc/Al₂O₃. The woven fibre form of ((Al₂O₃)_f/ZrO₂) _mc was made by dipping a plain woven Al₂O₃ fabric into colloidal ZrO₂ solution. Then Al₂O₃ powder dispersed slurry was infiltrated into the open spaces of the woven fabric ((Al₂O₃) /ZrO₂)_mc. The infiltrated minicomposites were stacked, pressed, and sintered in ambient air to form a plate of ((Al₂O₃)_f/ZrO₂)_mc/Al₂O₃. The optimum sintering temperature of ((Al₂O₃)_f/ZrO₂)_mc/Al₂O₃ was investigated via tensile strength and matrix density. Tensile behaviour and fracture resistance of the composite fabricated under the optimum processing condition were evaluated. The tensile stress - strain behaviour of the optimised composite showed non-catastrophic fracture behaviour with bundle bridging and extensive fibre bundle pullouts. The maximum tensile stress revealed that almost full strength expected from the bare bundle strength was exploited by the proposed process.

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Fabrication and mechanical properties of woven Al 2 O 3 fibre – ZrO 2 matrix minicomposite reinforced Al 2 O 3 matrix composites by slurry infiltration – sintering process

Abstract

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