Abstract
AlN-ZrO2(Ca) composites were prepared with two kinds of Ca-stabilized zirconia (ZrO2(Ca), i.e Ca-PSZ, particle size d50=65μm and d50=7.5μm) and three kinds of AlN power (d50=15μm, d50=0.5μm and d50=40nm) as raw material in N2 atmosphere by pressureless sintering at 1850 oC. The phase compositions and microstructures of composites were investigated by XRD, SEM and EDS.The sintering performance of the composites was measured by the checking of the bending strength, and the apparent porosity of samples. The results showed that phase compositions of the composites consisted of major phases C-ZrO2 and AlN and minor phase CaAl12O19. It was harder that AlN-ZrO2(Ca) composites were sintered than ZrO2(Ca) material. It was major cause that phase CaAl12O19 formed and its abnormal growed in the boundary layer between AlN particle and ZrO2(Ca) matrix. With 2mm AlN particles as raw material, AlN-ZrO2(Ca) composites had better sintering performance when concent of AlN equaled to 8%.
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