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<p>The oxidizing behaviors of Kovar alloy under an air or humid nitrogen atmospheres were systematically investigated. Optical microscopy, scanning electron microscopy, and energy dispersive spectrometer were used to analyze the evolution in morphologies and elemental compositions under different processing protocols. Different from the loosely cylinder-like protrusions formed at grain boundaries under the air atmosphere, dense oxide layers with cracks were identified at grain boundaries under the wet nitrogen atmosphere. This difference is considered to be the origin of enhanced qualified rate of Kovar alloy to borosilicate glass sealing products prepared through the pre-oxidization under the wet nitrogen environment. These deep understandings are very helpful to obtain glass to metal seal with high quality through further optimizing the sealing process.</p>

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Oxidizing Behaviors of Kovar Alloy under Different Atmospheric Environments

  • 期刊论文

  • 发表日期：

    2026年5月26日

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  • Zhenxin Lü,
  • Hemin Zhou,
  • Yadan Wang,
  • Xiaowei Wang,
  • Ang Qiao,
  • Haizheng Tao

摘要

The oxidizing behaviors of Kovar alloy under an air or humid nitrogen atmospheres were systematically investigated. Optical microscopy, scanning electron microscopy, and energy dispersive spectrometer were used to analyze the evolution in morphologies and elemental compositions under different processing protocols. Different from the loosely cylinder-like protrusions formed at grain boundaries under the air atmosphere, dense oxide layers with cracks were identified at grain boundaries under the wet nitrogen atmosphere. This difference is considered to be the origin of enhanced qualified rate of Kovar alloy to borosilicate glass sealing products prepared through the pre-oxidization under the wet nitrogen environment. These deep understandings are very helpful to obtain glass to metal seal with high quality through further optimizing the sealing process.