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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。
Using the self-developed instrument into the instrument, using Vickers indenter of silicon nitride and zirconia two kinds of structural ceramics were pressed into the test instrument, by pressing the load-depth curve can identify the elastic modulus of the material E, through Measuring diametral indentation to determine the material Vickers hardness HV, and then by measuring the indentation crack growth length can be obtained by the fracture toughness of the material KIC, achieved in a single indentor based on the Vickers pressure head on the structural ceramic material fracture Toughness test. Compared with the traditional indentation method using hardness tester or nanoindentation instrument to test the fracture toughness of ceramic materials, the test is more simple and quick, the reliability is high, and the measured information is also more abundant. The fracture toughness of the two kinds of structural ceramics measured by the test were 4.77 ~ 5.82 MPa.m1 / 2 and 7.22 ~ 8.94 MPa.m1 / 2, respectively.