Abstract The structural degradation resulting from the phase transformation of excrescent monoclinic form limits the long-term durability and sintering adaptability of the ZrO2-based ceramic components. The objective of the present study was to report on the use of the fully tetragonal nanocrystalline 3mol% yttria-stabilized tetragonal zirconia polycrystals (3Y-TZP) powders as the starting material for ZrO2-toughened ceramics. The influences of time-temperature sintering conditions on the fracture toughness of the 3Y-TZP ceramics were investigated. Dense 3Y-TZP ceramics (>96% of theoretical density) with no monoclinic structure can be achieved with a Hollomon-Jaffe parameter (HJP) in the range of 46 K–52 K. The fracture toughness values of the 3Y-TZP ceramics were determined to be in the range of 4.0–6.2 MP m1/2, and these values did not vary significantly over a wide sintering range. Phase composition and microstructure analysis results indicate that the high fracture toughness over a wider range of sintering conditions can be attributed to the cooperativity between the transformation toughening mechanism and the critical grain size effect of the transition from the tetragonal to monoclinic phase of the 3Y-TZP.

中文翻译：

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3Y-TZP 陶瓷在广泛的烧结范围内具有高断裂韧性

摘要 增大的单斜晶型相变导致的结构退化限制了 ZrO2 基陶瓷组件的长期耐久性和烧结适应性。本研究的目的是报告使用全四方纳米晶 3mol% 氧化钇稳定的四方氧化锆多晶 (3Y-TZP) 粉末作为 ZrO2 增韧陶瓷的起始材料。研究了时间-温度烧结条件对3Y-TZP陶瓷断裂韧性的影响。没有单斜结构的致密 3Y-TZP 陶瓷（>96% 的理论密度）可以通过 46 K-52 K 范围内的 Hollomon-Jaffe 参数（HJP）实现。 3Y-TZP 陶瓷的断裂韧性值是确定在 4.0–6.2 MP m1/2 的范围内，并且这些值在很宽的烧结范围内没有显着变化。相组成和微观结构分析结果表明，在更宽的烧结条件范围内具有高断裂韧性可归因于相变增韧机制与 3Y-TZP 从四方相向单斜相转变的临界晶粒尺寸效应之间的协同作用.