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由氨基乙酸/硝酸盐闷烧方法制备了含8%Y2O3的纳米晶钇稳定氧化锆粉末,用火花等离子体烧结(SPS)、热压(HP)和传统烧结法(CS)研究了其致密性。SPS技术比其余烧结方法优异,能在较低温度和较短烧结时间获取具有均匀形态的致密化材料(≥96%)。经SPS、热压和传统烧结方法制备的材料,其晶粒尺寸分别是0.21、0.37和12μm。材料的总电导率与晶粒尺寸并无明确关系,但SPS烧结材料的活化能比其余两种致密化方法的稍高。由Vickers压痕法测得的硬度与晶粒尺寸无关,而断裂韧性(由压痕法测得)随晶粒尺寸增大而轻微下降。
The nanocrystalline yttria-stabilized zirconia powder containing 8% Y2O3 was prepared by glycine / nitrite smoldering method. The compactness of the nanocrystalline yttria stabilized zirconia powder was studied by spark plasma sintering (SPS), hot pressing (HP) and conventional sintering (CS) . The SPS technique is superior to the rest of the sintering methods and can obtain densified material with uniform morphology (≥ 96%) at lower temperatures and shorter sintering times. Materials prepared by SPS, hot pressing and conventional sintering methods have grain sizes of 0.21, 0.37 and 12 μm, respectively. The total conductivity of the material is not related to the grain size, but the SPS sintering material has a slightly higher activation energy than the other two densification methods. The hardness measured by the Vickers indentation method is independent of the grain size and the fracture toughness (as measured by the indentation method) slightly decreases as the grain size increases.