Evaluation of High Temperature Interfacial Bonding Strength of Ti3SiC2-Al2O3 Joint in Air
Ti3SiC2-Al2O3joint with strong interface has potential high temperature applications because it combines with the merits of hard ceramics and soft ceramics. The safety is strongly dependent on the interfacial bonding strength between Ti3SiC2and Al2O3. In this work, the cross-section method was suggested to evaluate the tensile and shear bonding strength for Ti3SiC2-Al2O3joint from room temperature to 800 °C in air. A novel testing fixture made of SiC was designed and machined to avoid the bending stress at the bonding surface during the testing process. It is indicated that the measured shear bonding strength is usually higher than tensile bonding strength for Ti3SiC2-Al2O3joint. Both the tensile and shear bonding strength are decreased with the increment of testing temperatures. At 800 °C, the tensile and shear bonding strength are declined to be about 43.15% and 45.02% compared with those at room temperature, relatively. The mechanism for the strong interface between Ti3SiC2and Al2O3is also discussed.