基于仪器化压入技术的结构陶瓷材料断裂韧性测试  

Test of Fracture Toughness of Structural Ceramics Based on Instrumental Indentation Technology

作　　者：宋仲康[1] 马德军[1] 陈伟[1] 郭俊宏[1] 

机构地区：[1]装甲兵工程学院机械工程系

出　　处：《装甲兵工程学院学报》2012年第2期85-88,共4页Journal of Academy of Armored Force Engineering

基　　金：国家自然科学基金资助项目(10672185)

摘　　要：利用自主研制的仪器化压入仪,采用Vickers压头对氮化硅和氧化锆2种结构陶瓷进行了仪器化压入试验,通过压入载荷-深度曲线可识别材料的弹性模量E,通过测量压痕对角线直径可确定材料的维氏硬度HV,再通过测量压痕裂纹扩展长度即可得到材料的断裂韧性KIC,实现了在单一压入仪上基于Vickers压头对结构陶瓷材料断裂韧性的测试。与传统压痕法利用硬度计或纳米压入仪测试陶瓷材料断裂韧性相比,试验更简单快捷,可靠性高,同时测得信息量也更为丰富。试验测得2种结构陶瓷的断裂韧性分别为4.77～5.82 MPa.m1/2和7.22～8.94 MPa.m1/2。Fracture toughness of structural ceramic materials can be obtained with self-developed instrumental macro-indentation tester and two kinds of structural ceramics like silicon nitride and zirconium oxide are tested on the instrumental indentation with a Vickers indenter.The elastic modulus E of materials can be identified by suppressing load-depth curve,the Vickers hardness HV can be determined by measuring diagonal diameter of indentation,the fracture toughness KIC is obtained by measuring indentation fracture extension length,thus realizing the test of fracture toughness of structural ceramics on macro-indentation tester based on Vickers indenter.Compared with the traditional method which first uses a nanoindentation tester or the sclerometer to test the fracture toughness of structural ceramics,this test is easier and more reliable,and the information tested are more.The results of test show the fracture toughness of two ceramic materials are respectively 4.77-5.82 MPa · m1/2 and 7.22-8.94 MPa · m1/2.

关 键 词：仪器化压入 弹性模量 维氏硬度 断裂韧性 

分 类 号：TB302.5[一般工业技术—材料科学与工程]