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We fabricated AlN ceramics at sintering temperatures with a minimum of 1450°C using spark plasma sintering (SPS) with Y2O3–CaO–B or Y2O3–CaO–LaB6 sintering additives. The relative densities of the AlN ceramics sintered at 1500°C for 10min with a uniaxial pressure of 50MPa exceeded 98%, indicating sufficient densification. However, with decreasing the sintering temperature to 1450°C, the relative densities...
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