Research on the mechanism of laser drilling alumina ceramics in shallow water
Research on the mechanism of laser drilling alumina ceramics in shallow water
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DOI：
10.1007/s00170-021-08190-0
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发表时间：
2021-10
期刊：
影响因子：
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通讯作者：
Guangliang Li;D. Shi;S. Hu;Chunlong Ma;Dongze He;Kai Yao
中科院分区：
文献类型：
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作者：
Guangliang Li;D. Shi;S. Hu;Chunlong Ma;Dongze He;Kai Yao
氧化铝陶瓷水下激光打孔是提高材料孔质量的有效手段。在水下激光钻孔过程中，不仅水对提高孔的质量有很大的作用，而且气泡（陶瓷在水中熔化爆炸产生的）对减少孔壁重铸层也有重要的作用。本文研究了水和气泡对水中激光打孔表面质量的影响机理。分别在空气和水中对氧化铝陶瓷进行了两组激光打孔实验。结果表明，水和气泡有效地减少了重铸层的厚度和飞溅量。此外，通过比较激光在空气和水中钻孔的氧化铝陶瓷孔壁上的裂纹宽度，发现水显著降低了激光的热效应。气泡的崩塌和破裂产生冲击和振动，导致孔内壁的重铸层脱落。但由于水的冷却作用，缩短了重铸层的冷却时间。如果不能及时破泡，就会在孔壁上形成气孔。当激光机输入电流为160 A时，水和气泡都有助于提高激光打孔氧化铝陶瓷的质量。本文的研究是对水下激光打孔机理的补充。在工程应用中具有重要的参考价值。
Underwater laser drilling of alumina ceramics is an effective means to improve the quality of holes in the material. In the process of underwater laser drilling, not only water plays a great role in improving the quality of the hole, but also bubbles (generated by ceramic melting explosions in water) play an important effect in reducing the recast layer of the hole wall. In this paper, the influence mechanism of water and bubbles on the surface quality of the hole of laser drilling in water was studied. Two sets of experiments were performed for the laser drilling of alumina ceramics in air and in water, respectively. The results showed that water and bubbles effectively reduced the thickness of the recast layer and the amount of spatter. Moreover, by comparing the width of cracks on the hole wall of the alumina ceramic drilled by the laser in air and in water, it was found that water significantly reduced the thermal effect of the laser. The collapse and rupture of the bubbles produced shock and vibration, causing the recast layer on the inner wall of the hole to fall off. However, the cooling time of the recast layer was reduced due to the cooling effect of water. If the bubbles cannot be broken in time, it will cause the formation of a blowhole on the hole wall. When the input current of the laser machine was 160 A, both water and bubbles were helpful to improve the quality of laser drilling alumina ceramics. The research in this article supplements the mechanism of underwater laser drilling. And it has important reference value in engineering application.