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采用一次成形烧结的方法成功制备了Y_2O_3-Nb/Y_2O_3复合梯度材料,并用XRD、SEM及EDS表征了其相组成和组织结构。结果表明该复合梯度材料中除气相外只有Y_2O_3相和Nb相,其中Nb以片层状和弥散点状两种形态分布在Y_2O_3基体中。测试了Y_2O_3-Nb/Y_2O_3复合梯度材料的室温三点弯曲强度,结果显示其弯曲强度高于纯Y_2O_3以及Y_2O_3-Nb复合材料,表明Y_2O_3梯度层与以Y_2O_3为基体的复合材料具有较高的结合强度。
Y_2O_3-Nb / Y_2O_3 composite gradient materials were successfully prepared by one-step sintering. The phase composition and microstructure of the composite materials were characterized by XRD, SEM and EDS. The results show that there are only Y_2O_3 phase and Nb phase except the gas phase in the composite gradient material. Among them, Nb is distributed in the Y_2O_3 matrix in lamellar and dispersive spots. The three-point bending strength of Y_2O_3-Nb / Y_2O_3 composite graded material at room temperature was tested. The results showed that the flexural strength of Y_2O_3-Nb / Y_2O_3 composites was higher than that of pure Y_2O_3 and Y_2O_3-Nb composites, indicating that the Y_2O_3 graded layer has a higher bond with the Y_2O_3- strength.