激光切口法测量ZrB2–SiC–Graphite陶瓷的断裂韧性  

Accurate Measurement of Fracture Toughness in ZrB2–SiC–Graphite Ceramic via Laser Notching Method

作　　者：张幸红[1] 王安哲 谢茂松 胡平[1] ZHANG Xinghong;WANG Anzhe;XIE Maosong;HU Ping(School of stronautics,Harbin Institute of Technology,Center for Composite Materials and Structures,Harbin 150001,China;School of Materials Engineering,Nanjing Institute of Technology,Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology,Nanjing 211167,China)

机构地区：[1]哈尔滨工业大学航天学院,复合材料与结构研究所,哈尔滨150001 [2]南京工程学院材料工程学院,江苏省先进结构材料与应用技术重点实验室,南京211167

出　　处：《硅酸盐学报》2018年第12期1707-1711,共5页Journal of The Chinese Ceramic Society

基　　金：国家杰出青年基金(51525201)资助

摘　　要：采用纳秒激光在ZrB2-SiC-Graphite(ZSG)陶瓷材料中引入了尖锐的V型切口,切口尖端半径小于1μm。通过单边V型切口梁法测得ZSG陶瓷材料的断裂韧性为3.88MPa·m^1/2,与单边预裂纹梁法结果吻合,表明激光切口法的有效性。研究了断裂韧性与激光切口深度和试样厚度比值(a/W)的关系,对于ZSG陶瓷,试样的a/W取值范围为0.1~0.6时能获得准确的断裂韧性值。Sharp V-notches with tip radius less than 1 μm were introduced in the ZrB2-SiC-Graphite(ZSG) ceramic via a nanosecond laser. The fracture toughness of ZSG ceramic measured by a single-edge V-notched beam method is 3.88 MPa·m^1/2, which is in reasonable agreement with that by a single-edge precracked beam method. In addition, fracture toughness values of test samples with different ratios of notch depths to sample heights(a/W) were also investigated. The results show that accurate fracture toughness value of ZSG ceramic can be obtained when the a/W value is in the range of 0.1-0.6.

关 键 词：陶瓷 断裂韧性 激光 尖锐切口 

分 类 号：TB302[一般工业技术—材料科学与工程]