抗极端条件的高性能硅-金属激光焊接
High-performance silicon-metal laser welding resisting extreme conditions
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中文总结 AI 辅助
本文通过优化亚纳秒脉冲激光焊接的多项参数，实现了强度达15.8 MPa、耐500°C高温且气密性良好的硅-可伐合金接头，拓展了硅-金属焊接在多领域的应用。
中文摘要 AI 辅助
可靠的材料连接是无数工业应用的关键。飞秒激光焊接提供了超越传统连接方法的途径，但由于非线性传播效应，硅-金属接头的演示案例很少，且迄今为止其剪切连接强度仅局限在几兆帕（MPa）。本文中，我们展示了使用亚纳秒脉冲实现的高强度硅-可伐合金（Kovar）激光焊接。通过优化焦点位置、焊接图案、激光偏振方向以及金属粗糙度，我们获得了高达15.8 MPa的优异剪切连接强度。该硅-金属接头可承受高达500°C的温度，且气密性良好。结合出色的强度值，其对恶劣环境的耐受性进一步证明了硅-金属焊接在航空航天、核科学以及冶金等多个领域的适用性。
英文摘要
Reliable material joining is essential for countless industrial applications. While femtosecond laser welding provides a route beyond conventional bonding methods, demonstrations of silicon-metal joints are rare due to nonlinear propagation effects and have so far been limited to shear joining strengths of a few MPa. Here, we demonstrate high-strength silicon-Kovar laser welding using sub-nanosecond pulses. By optimizing the focal position, the welding pattern, the laser polarization, and the metal roughness, remarkable shear joining strengths up to 15.8 MPa are achieved. The silicon-metal joints withstand temperatures of up to 500 °C and are hermetically sealed. Together with the remarkable strength values, the resistance to harsh environments underpins the applicability of silicon-metal welding in various fields including aerospace, nuclear science, and metallurgy.
