| Study on the pore/scratch-strength response of ZrB2–SiC ceramic via laser processing |
| Anzhe Wang1,2,3,4, Shuai Wang2,3, Huimin Yin2,3, Peng Zhou1, Dazhao Liu5 |
1Institute of Intelligent Manufacturing Technology, Shenzhen Polytechnic, Shenzhen 518055, People’s Republic of China
2School of Materials Science and Engineering, Nanjing Institute of Technology, Nanjing 211167, People’s Republic of China
3Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology, Nanjing 211167, People’s Republic of China
4Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China
5Anhui Key Laboratory of High-Performance Non-Ferrous Metal Materials , Anhui Polytechnic University, Wuhu 241000, People’s Republic of China |
|
|
|
Received: December 13, 2021; Revised: April 30, 2022 Accepted: May 31, 2022. Published online: July 1, 2022. |
|
|
|
| ABSTRACT |
|
Defects, such as pores and scratches, are inevitably introduced during preparation and processing of ceramics. How they affect the mechanical properties of materials is worthy of attention. Here, artificial surface pores and notches introduced by femtosecond/nanosecond lasers are regarded as inherent pore- and scratch-like defects. Bending test results indicated that a small-sized flaw with the length and depth of ~ 10 μm could lead to a strength reduction up to ~ 40% in sharp flaw case, while only slight attenuation (< 10%) occurs in blunt flaw case. Linear extrapolation result reveals that the maximum strength in notch cases, when the depth reaches the atomic scale, is ~ 34 GPa, which is in the range of the theoretical value of 24–48 GPa. Furthermore, the calculated critical flaw size (ac) may tend to be overestimated, given that the artificial defect, which is smaller than the ac value, also results in significant strength decay. This study could provide guidance for strength evaluation and high-strength design of ceramics. |
| Key words:
ZrB2–SiC · Defect · Notch · Flexural strength · Theoretical strength |
|
|
|
PDF Links 
Full text via DOI
Download Citation 
