Preparation of Al2O3(YAG)/LaPO4 laminated ceramics composites

In the present work, aqueous gel castingg-hot pressing technique to prepare oxide matrix laminated ceramic composites by using Al2O3(YAG) as matrix layers and LaPO4 as interfacial layers. The composites with about 110 mu m matrix layers and 10 mu m interfacial layers were prepared. The effects of content LaPO4 and procedure parameters of hot pressing on properties of oxide matrix laminated ceramic composites were investigated. The results show that the bending strength of oxide matrix laminated ceramics decreases a little, while the fracture toughness of as-prepared composites is made much improvement. The maximal apparent fracture toughness of the oxide laminated ceramic composites is 13.52MPa.m(1/2), which is three times over matrix composites. The differences of the cracks trend between the oxide matrix laminated ceramic and matrix materials are compared in detail in this paper.