Effect of the composition and sintering process on mechanical properties and residual stresses in zirconia-alumina composites
Effect of the composition and sintering process on mechanical properties and residual stresses in zirconia-alumina composites
复制标题
DOI：
10.1016/j.jeurceramsoc.2004.09.025
复制
发表时间：
2005-10-01
影响因子：
5.7
通讯作者：
Brillante, A
中科院分区：
文献类型：
--
作者：
Magnani, G;Brillante, A
制备了含有少量氧化铬和磁铅石型晶相（CeMgAl11O19）的氧化锆增韧氧化铝（ZTA）样品，并在不同条件下进行了加工。硬度和断裂韧性等机械性能作为不同参数的函数进行了检查。例如，添加氧化铬可提高断裂韧性，而添加片晶增强材料可抑制四方氧化锆（t-氧化锆）-单斜氧化锆（m-氧化锆）转变。此外，通过拉曼光谱和荧光压电光谱检查了四方氧化锆的相变性和氧化铝相中的残余应力。分别。特别地，在维氏压痕后通过拉曼光谱测定t-氧化锆转变为m-氧化锆的程度，并且转变能力与断裂韧性相关。结果表明，单斜晶含量和韧性呈线性相关，并将实验结果与现有的氧化锆基材料模型进行了比较。另一方面。由相变增韧机制产生的残余应力与四方相的相变能力相关。 (c) 2004 Elsevier Ltd. 保留所有权利。
Samples of zirconia-toughened alumina (ZTA) with small amounts of chromia and magnetoplumbite-type crystalline phase (CeMgAl11O19) have been prepared and processed under different conditions. Mechanical properties like hardness and fracture toughness were examined as a function of different parameters. As an example, fracture toughness was increased by the chromia addition, whereas platelets reinforcement addition suppressed the tetragonal zirconia (t-zirconia)-monoclinic zirconia (m-zirconia) transformation. In addition, transformability of the tetragonal zirconia and the residual stress in the alumina phase were examined by Raman and fluorescence piezo-spectroscopy. respectively. In particular, the extent to which t-zirconia transforms to m-zirconia was determined by Raman spectroscopy after Vickers indentation and the transformability was correlated to the fracture toughness. It was demonstrated that the monoclinic content and the toughness were correlated linearly and experimental results were compared with models already available for zirconia-based materials. On the other hand. residual stresses originated by transformation toughening mechanism were correlated to the transformability of the tetragonal phase. (c) 2004 Elsevier Ltd. All rights reserved.