基于氧化锆陶瓷粒径控制的断裂韧性研究  

Fracture toughness based on particle size control of zirconia ceramics

作　　者：张涛[1] 郑自芹[1] 王彦莉 许西庆 梁景恒 于壮壮 张子博 ZHANG Tao;ZHENG Ziqin;WANG Yanli;XU Xiqing;LIANG Jingheng;YU Zhuangzhuang;ZHANG Zibo(Ningbo Branch of Chinese Academy of Ordnance Science,Yantai 264003,China;Chang′an University,Xi′an 710061,China)

机构地区：[1]中国兵器科学研究院宁波分院,山东烟台264003 [2]长安大学,陕西西安710061

出　　处：《兵器材料科学与工程》2022年第5期136-141,共6页Ordnance Material Science and Engineering

摘　　要：为研究颗粒尺寸对氧化锆陶瓷断裂韧性的影响规律,探索t-ZrO_(2)在断裂和压痕过程中发生马氏体相变的倾向,用无压烧结制备氧化锆(3%Y_(2)O_(3),摩尔分数)陶瓷,经1400℃和1500℃烧结,得到陶瓷试样颗粒尺寸分别为290 nm和780 nm。用压痕法和单边切口梁法测定氧化锆陶瓷的断裂韧性,通过X射线衍射和拉曼光谱分析压痕中不同区域的相变。结果表明:粗颗粒氧化锆陶瓷的硬度和弯曲强度均低于细颗粒陶瓷,但粗颗粒陶瓷的断裂韧性更高;细颗粒试样几乎未发生马氏体相变;粗颗粒陶瓷在断面中单斜相氧化锆的体积分数为26%,在压痕中心和裂纹尖端的单斜相体积分数分别为42.2%和18.5%,对阻碍裂纹扩展提高断裂韧性起重要作用。In order to study the effects of particle size on fracture toughness,and the t-ZrO_(2)martensitic transformation in the process of fracture and indentation method,ZrO_(2)(3%Y_(2)O_(3))ceramics were prepared by pressureless sintering,and the average particle sizes of ceramic samples were 290 nm and 780 nm after sintering at 1400℃and 1500℃,respectively.The fracture toughness was measured by indentation method and unilateral notch beam method,and the phase transition in difference areas of indentation was analyzed by X-ray diffraction and Raman spectroscopy.The results show that,even though the coarse grained zirconia ceramics exhibits lower hardness and bending strength than the fine grained ones,the coarse grained samples shows much larger fracture toughness.Almost no martensite phase transformation takes place in the fine grained samples.In comparison,the coarse grianed ceramics shows 26%m-ZrO_(2)in the fracture surface,and volume fractions of m-ZrO_(2)are 42.2%in the indent corner and 18.5%at the crack tip,which hinders the spreading of cracks and improves the fracture toughness.

关 键 词：氧化锆陶瓷 颗粒尺寸 马氏体相变 断裂韧性 拉曼光谱 

分 类 号：TB321[一般工业技术—材料科学与工程]