Abstract
Ceramic/metal composites were fabricated by using mullite refractory plate and Al foil, and their mechanical properties were investigated. Al 2 O 3 ( Al-Si) composite was formed in the mullite refractories by the reaction between Al and the mullite and silica glassy phases in the refractories. This reaction joined Al metal with the refractory plate. Si formed by the reaction dissolved in the molten Al and precipitated in the Al-Si layer after processing. The Al-Si layer remained almost same thickness after heating at 900 °C, but at 800 °C and 1000 °C, thin Al-Si and Al 2 O 3 ( Al-Si) composite layers and cavities were observed between the refractory plates. Three types of characteristic fracture behaviour were observed. The bending strength of the mullite refractories/ ( Al 2 O 3 Al-Si)/( Al-Si) laminates with thick Al-Si layers was lower than that of the laminates with thin reaction layers, but the former laminates showed fracture tailing and the plateau of deformation in the load/displacement curve compared with the brittle fracture of the latter laminate. The lower strength of the former laminates may be attributed to the Si phase formed in the Al-Si layer.
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