硅酸盐学报

激光切口法测量ZrB2–SiC–Graphite陶瓷的断裂韧性

作者：张幸红1 王安哲2 谢茂松1 胡平1

单位：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

关键词：陶瓷断裂韧性激光尖锐切口

分类号：TB302

出版年,卷(期):页码：2018,46(12):0-0

DOI：10.14062/j.issn.0454-5648.2018.12.07

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1 μm。通过单边V型切口梁法测得ZSG陶瓷材料的断裂韧性为3.88 MPa•m1/2，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•m1/2, 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.

基金项目：

国家杰出青年基金(51525201)资助。

作者简介：

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