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        Study on the pore/scratch-strength response of ZrB2–SiC ceramic via laser processing

        Wang Anzhe,Wang Shuai,Yin Huimin,Zhou Peng,Liu Dazhao 한국세라믹학회 2022 한국세라믹학회지 Vol.59 No.6

        Defects, such as pores and scratches, are inevitably introduced during preparation and processing of ceramics. How they aff ect the mechanical properties of materials is worthy of attention. Here, artifi cial 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 fl aw with the length and depth of ~ 10 μm could lead to a strength reduction up to ~ 40% in sharp fl aw case, while only slight attenuation (< 10%) occurs in blunt fl aw 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 fl aw size ( ac) may tend to be overestimated, given that the artifi cial defect, which is smaller than the ac value, also results in signifi cant strength decay. This study could provide guidance for strength evalu- ation and high-strength design of ceramics.

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