添加氧化镁对氧化锆增韧氧化铝（ZTA）陶瓷力学性能和动态性能的影响。

Effect of MgO Addition on the Mechanical and Dynamic Properties of Zirconia Toughened Alumina (ZTA) Ceramics.

作者信息

Arab Ali, Sktani Zhwan Dilshad Ibrahim, Zhou Qiang, Ahmad Zainal Arifin, Chen Pengwan

机构信息

State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China.

Structural Materials Niche Area, School of Materials and Mineral Resources Engineering, Engineering Campus, Universiti Sains Malaysia, Nibong Tebal 14300, Penang, Malaysia.

出版信息

Materials (Basel). 2019 Jul 31;12(15):2440. doi: 10.3390/ma12152440.

DOI:10.3390/ma12152440

PMID:31370216

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6696285/

Abstract

Zirconia toughened alumina (ZTA) is a promising advanced ceramic material for a wide range of applications that are subjected to dynamic loading. Therefore, the investigation of dynamic compressive strength, fracture toughness and hardness is essential for ZTA ceramics. However, the relationship between these mechanical properties in ZTA has not yet been established. An example of this relationship is demonstrated using ZTA samples added with MgO prepared through conventional sintering. The microstructure and mechanical properties of ZTA composites were characterized. The hardness of ZTA composites increased for ≤0.7 wt.% MgO due to the pinning effect of MgO and decrease of the porosity in the microstructure. Oppositely, the fracture toughness of ZTA composites continuously decreased due to the size reduction of AlO grains. This is the main reason of deteriorate of dynamic compressive strength more than 0.2 wt.% of MgO addition. Therefore, the SHPB test shows the improvement of the dynamic compressive strength only up to a tiny amount (0.2 wt.% of MgO addition) into ZTA ceramics.

摘要

氧化锆增韧氧化铝（ZTA）是一种很有前景的先进陶瓷材料，适用于承受动态载荷的广泛应用。因此，研究ZTA陶瓷的动态抗压强度、断裂韧性和硬度至关重要。然而，ZTA中这些力学性能之间的关系尚未确立。通过常规烧结制备的添加MgO的ZTA样品展示了这种关系的一个例子。对ZTA复合材料的微观结构和力学性能进行了表征。由于MgO的钉扎效应和微观结构中孔隙率的降低，添加≤0.7 wt.% MgO时ZTA复合材料的硬度增加。相反，由于AlO晶粒尺寸减小，ZTA复合材料的断裂韧性持续下降。这是添加超过0.2 wt.% MgO时动态抗压强度恶化的主要原因。因此，SHPB试验表明，向ZTA陶瓷中添加少量（0.2 wt.% MgO）时动态抗压强度有所提高。