Effect of molten zone ablated by femtosecond lasers on fracture toughness of Si3N4 measured by SEVNB method
Effect of molten zone ablated by femtosecond lasers on fracture toughness of Si3N4 measured by SEVNB method
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DOI：
10.1016/j.jeurceramsoc.2017.10.007
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发表时间：
2017-10
影响因子：
5.7
通讯作者：
Wei Zhao;J. Cui;Pinggen Rao
中科院分区：
文献类型：
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作者：
Wei Zhao;J. Cui;Pinggen Rao
采用飞秒激光在Si3N4陶瓷样品上切出一个超尖锐的V型缺口，进行断裂韧性测试。利用SEM、EDS和拉曼光谱研究了飞秒激光烧蚀V型缺口表面的熔融区。熔硅壳的厚度约为2 μm，而V形缺口尖端处的熔硅壳厚度很薄，很容易被氢氟酸腐蚀。具有熔融硅壳的Si_3N_4试样的断裂韧性值与刻蚀后的相当。结果表明，V形缺口表面的熔融区对液相烧结Si3N4陶瓷的断裂韧性没有影响。
Femtosecond lasers were used to cut an ultra-sharp V-notch on the Si3N4ceramic sample for fracture toughness testing. The molten zone on the V-notch surface ablated by femtosecond lasers was studied using SEM, EDS and Raman spectra. The thickness of the molten Si shell is about 2 μm, however, the thickness of the molten shell at the V-notch tip is very thin, and it can be easily etched with hydrofluoric acid. The fracture toughness value of the Si3N4sample with the molten Si shell is equal to that after etched. It is concluded that the molten zone on the V-notch surface have no influence on fracture toughness of liquid phase sintered Si3N4ceramics.