Mechanism of Sintering YAG/ZrB2Multiphase Ceramics with Spark Plasma Sintering

Although ZrB2 has some excellent performances, it is difficult to prepare the high relative-density ZrB2 ceramics, which limits the application of ZrB2 materials. To obtain higher relative-density ZrB2 ceramics for increasing the good oxidation resistance, YAG/ZrB2 multiphase ceramics is prepared with the spark plasma sintering, the sintering mechanism of preparing YAG/ZrB2 multiphase ceramic materials is investigated. Al2O3 reacts with Y2O3 to form YAG above 700°C during the sintering process. YAG is filled and melted the space of ZrB2 particles to bind the ZrB2 particles during reaction and sintering process, which increases the density of YAG/ZrB2 multiphase ceramic materials. The YAG/ZrB2 multiphase ceramic materials was successfully prepared under sintering temperature of 1700°C, holding temperature time for 4 min, and sintering pressure of 20 MPa; the density is 5.63 g/cm3, the relative density is 99.78%.