Improving the mechanical properties of Al 2O 3/Ni laminated composites by adding Ni particles in Al 2O 3 layers

Abstract

The (Al 2O 3 + Ni) composite, (Al 2O 3 + Ni)/Ni and Al 2O 3/(Al 2O 3 + Ni)/Ni laminated materials were prepared by aqueous tape casting and hot pressing. Results indicated that the (Al 2O 3 + Ni) composite had higher strength and fracture toughness than those of pure Al 2O 3. The fracture toughness of (Al 2O 3 + Ni)/Ni and Al 2O 3/(Al 2O 3 + Ni)/Ni laminated materials was higher than not only those of pure Al 2O 3, but also those of Al 2O 3/Ni laminar with the same layer numbers and thickness ratio. It was found that the toughness of the Al 2O 3/(Al 2O 3 + Ni)/Ni laminated material with five layers and layer thickness ratio = 2 could reach 16.10 MPa m 1/2, which were about 4.6 times of pure Al 2O 3. The strength and toughness of the (Al 2O 3 + Ni)/Ni laminated material with three layers and layer thickness ratio = 2 could reach 417.41 MPa and 12.42 MPa m 1/2. It indicated the material had better mechanical property.