Abstract
This paper studied the composition of the interface-layer (Ti3SiC2 layer), the residual stresses and the interface structure in the Al2O3/Ti3SiC2 multilayer composites. About 50 vol.% TiC was determined by X-ray diffraction (XRD) in the interface-layer. The TiC phase was formed probably due to the diffusion of Si-rich liquid from the Ti3SiC2 layer into the Al2O3 layer and volatilization during sintering. The existence of TiC phase changed the residual stress state of the multilayer composites. According to the calculation, about 121.2 MPa residual tensile stress was produced in the Al2O3 layer and the equivalent residual compressive stress in the Ti3SiC2 layer. Furthermore, two kinds of weak interface were observed between the matrix and interface-layers due to the existence of TiC phase, i.e., Al2O3/Ti3SiC2 and Al2O3/TiC interfaces. Both the two interfaces were weak enough to deflect the crack, and therefore, toughness of the multilayer materials was improved.
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