研究目的
Investigating the effect of thermal stresses induced by femtosecond laser on the fracture toughness of fine-grained alumina ceramics.
研究成果
The study concludes that the thermal stresses induced by femtosecond laser on the V-notch have almost no effect on the fracture toughness of fine-grained alumina ceramics, as the KΙc values before and after annealing were nearly equal. The accurate KΙc of the fine-grained alumina ceramic is determined to be 4 MPa m1/2.
研究不足
The study focuses on fine-grained alumina ceramics, and the findings may not be directly applicable to other materials or grain sizes. The effect of thermal stresses is considered negligible based on the specific conditions and materials used.
1：Experimental Design and Method Selection:
The study used the single-edge V-notched beam (SEVNB) method to measure fracture toughness, with femtosecond laser cutting to create ultra-sharp V-notches.
2：Sample Selection and Data Sources:
Fine-grained alumina ceramic bars were prepared and sintered.
3：List of Experimental Equipment and Materials:
Included a femtosecond laser (Chameleon ultra; Coherent, America), optical microscope (SZX 10, Olympus, Japan), and SEM (EVO 18, Zeiss, Germany).
4：Experimental Procedures and Operational Workflow:
Samples were prepared, notched with a femtosecond laser, annealed, and then tested for fracture toughness.
5：Data Analysis Methods:
Fracture toughness values were calculated in accordance with ASTM C-1421 standard, and morphologies were analyzed by SEM and micro-Raman spectra.
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