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Si3N4 ceramic was densified by hot pressing sintering at 1750°C for 1h under the uniaxial pressure of 20MPa in N2 atmosphere with YF3 and MgO as sintering additives. The thermal conductivities of SN-YF specimen were both higher than that of Si3N4 ceramic sintered with Y2O3 and MgO before and after annealing treatment. The grain size and aspect ratio in SN-YF specimen were both bigger than those in...
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