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| Ag-CuO钎焊Si3N4陶瓷接头的结构与性能研究 |
| Study on the structure and properties of Si3N4 ceramic joints brazed with Ag-CuO |
| Received:November 22, 2024 |
| DOI： |
| 中文关键词: Ag-CuO钎料 Si3N4陶瓷 接头结构 抗剪强度 |
| 英文关键词: Ag-CuO brazing filler Si3N4 ceramic joint structure shear strength |
| 基金项目:云南贵金属实验室科技计划项目(YPML-2023050230，YPML-2023050205)；国家自然科学基金项目(52101040) |
| Author Name | Affiliation | | ZHAO Shangqiang | Yunnan Precious Metal Laboratory Co. Ltd., Kunming 650106, China | | CHEN Yongtai | Yunnan Precious Metal Laboratory Co. Ltd., Kunming 650106, China | | YANG Youcai | Yunnan Precious Metal Laboratory Co. Ltd., Kunming 650106, China | | FANG Jiheng | Yunnan Precious Metal Laboratory Co. Ltd., Kunming 650106, China | | LIU Guohua | Yunnan Precious Metal Laboratory Co. Ltd., Kunming 650106, China | | XIE Ming | Yunnan Precious Metal Laboratory Co. Ltd., Kunming 650106, China |
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| 中文摘要: |
| 通过连接的方式解决Si3N4陶瓷高硬、高脆等特性导致的难加工等问题，可有效促进Si3N4陶瓷的应用，然而当下常用的扩散连接、活性金属钎焊和玻璃钎焊等方法工艺要求较高或接头高温抗氧化性较差。为简化工艺要求并获得高温抗氧化的Si3N4陶瓷接头，引入空气反应钎焊方法，以Ag-CuO为钎料，研究CuO含量、钎焊温度和保温时间对Si3N4/Si3N4接头结构和性能的影响。结果表明，以Ag-8CuO钎料在1050 ℃保温30 min钎焊所得接头的钎缝均匀致密，界面结合牢固，接头结构为:Si3N4/SiO2/SiO2+Cu-O(rich)/钎料(Ag+Cu-O)/SiO2+Cu-O(rich)/SiO2/Si3N4，此时接头抗剪强度达到最大值45 MPa，而且接头在800 ℃进行48 h的高温氧化试验后，强度仍达31.9 MPa，表现出了较好的高温抗氧化性。 |
| 英文摘要: |
| The difficulty in processing caused by the high hardness and high brittleness of Si3N4 ceramics can be overcome via bonding approaches, which will effectively promote the application of Si3N4 ceramics. Nevertheless, the commonly used diffusion bonding, active metal brazing, and glass brazing methods either have demanding process requirements or the resulted joints exhibit poor high-temperature oxidation resistance. To simplify the process requirements and obtain high-temperature oxidation-resistant Si3N4 ceramic joints, reactive air brazing method was introduced in this study. Ag-CuO was used as the brazing filler. The influences of CuO contents, brazing temperatures, and holding time on the structure and performance of the Si3N4/Si3N4 joints were investigated. The results demonstrated that the joint brazed with Ag-8CuO at 1050 °C for 30 minutes displayed uniform and dense brazing seams, and the interfaces were firmly bonded. The joint composition was Si3N4/SiO2/SiO2+Cu-O(rich)/brazing filler (Ag+Cu-O)/SiO2+Cu-O(rich)/SiO2/Si3N4, with a maximum shear strength of 45 MPa. The strength remained at 31.9 MPa even after a high-temperature oxidation at 800 ℃ for 48 hours, exhibiting excellent high-temperature oxidation resistance. |
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