Study on Reactive Air Brazing of p-SiO<sub>2</sub> Ceramic with Ag-xCuO Filler Metal
Reactive air brazing of porous SiO<sub>2</sub> ceramic (p-SiO<sub>2</sub>) was achieved using Ag-CuO filler metal. When brazing p-SiO<sub>2</sub>, two main problems existed. Firstly, the wettability of the Ag filler metal on the surface of p-SiO<sub>2</su...
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| Format: | Article |
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MDPI AG
2023-09-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/13/9/1561 |
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| author | Yongwei Chen Qiang Ma Peng He |
| author_facet | Yongwei Chen Qiang Ma Peng He |
| author_sort | Yongwei Chen |
| collection | DOAJ |
| description | Reactive air brazing of porous SiO<sub>2</sub> ceramic (p-SiO<sub>2</sub>) was achieved using Ag-CuO filler metal. When brazing p-SiO<sub>2</sub>, two main problems existed. Firstly, the wettability of the Ag filler metal on the surface of p-SiO<sub>2</sub> was poor. Secondly, the residual stress caused by the mismatch of the coefficient of thermal expansion was high in the joint. In order to solve these problems, the effects of CuO contents on the p-SiO<sub>2</sub> brazed joint were analyzed. In a wetting experiment, the addition of CuO significantly improved the wettability of the Ag-CuO/p-SiO<sub>2</sub> system. With the content of CuO increasing, the contact angle decreased from 90° to 0°. In addition, when the content of CuO increased to 0.5 mol%, the contact angle decreased from 90° to 52°. Then, during brazing p-SiO<sub>2</sub> with the Ag-xCuO filler metal, the typical interfacial microstructure of the joints brazed at 1000 °C for 30 min was p-SiO<sub>2</sub> ceramic/Ag (s,s) + SiO<sub>2</sub> + CuO/Ag (s,s)/Ag (s,s) + SiO<sub>2</sub> + CuO/p-SiO<sub>2</sub> ceramic. Meanwhile, Ag-CuO infiltrated into the p-SiO<sub>2</sub> ceramic and an infiltration layer formed. The infiltration layer was composed of Ag (s,s) + SiO<sub>2</sub> + CuO and the infiltration layer was conductive to form a good gradient transition of the coefficient of thermal expansion (CTE). Then, the residual stress in the joint was released and the shear strength improved. In addition, with the content of CuO increasing, the depth of the infiltration layer increased. Furthermore, when the content of CuO was 0.5 mol%, the maximum shear strength of the joint was 55 MPa. |
| first_indexed | 2024-03-10T22:28:05Z |
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| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-10T22:28:05Z |
| publishDate | 2023-09-01 |
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| record_format | Article |
| series | Metals |
| spelling | doaj.art-8678e03818ad4bd68e0659ac252700f12023-11-19T11:56:40ZengMDPI AGMetals2075-47012023-09-01139156110.3390/met13091561Study on Reactive Air Brazing of p-SiO<sub>2</sub> Ceramic with Ag-xCuO Filler MetalYongwei Chen0Qiang Ma1Peng He2Key Laboratory of Advanced Welding Technology of Jiangsu Province, Jiangsu University of Science and Technology, Zhenjiang 212003, ChinaKey Laboratory of Advanced Welding Technology of Jiangsu Province, Jiangsu University of Science and Technology, Zhenjiang 212003, ChinaState Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, ChinaReactive air brazing of porous SiO<sub>2</sub> ceramic (p-SiO<sub>2</sub>) was achieved using Ag-CuO filler metal. When brazing p-SiO<sub>2</sub>, two main problems existed. Firstly, the wettability of the Ag filler metal on the surface of p-SiO<sub>2</sub> was poor. Secondly, the residual stress caused by the mismatch of the coefficient of thermal expansion was high in the joint. In order to solve these problems, the effects of CuO contents on the p-SiO<sub>2</sub> brazed joint were analyzed. In a wetting experiment, the addition of CuO significantly improved the wettability of the Ag-CuO/p-SiO<sub>2</sub> system. With the content of CuO increasing, the contact angle decreased from 90° to 0°. In addition, when the content of CuO increased to 0.5 mol%, the contact angle decreased from 90° to 52°. Then, during brazing p-SiO<sub>2</sub> with the Ag-xCuO filler metal, the typical interfacial microstructure of the joints brazed at 1000 °C for 30 min was p-SiO<sub>2</sub> ceramic/Ag (s,s) + SiO<sub>2</sub> + CuO/Ag (s,s)/Ag (s,s) + SiO<sub>2</sub> + CuO/p-SiO<sub>2</sub> ceramic. Meanwhile, Ag-CuO infiltrated into the p-SiO<sub>2</sub> ceramic and an infiltration layer formed. The infiltration layer was composed of Ag (s,s) + SiO<sub>2</sub> + CuO and the infiltration layer was conductive to form a good gradient transition of the coefficient of thermal expansion (CTE). Then, the residual stress in the joint was released and the shear strength improved. In addition, with the content of CuO increasing, the depth of the infiltration layer increased. Furthermore, when the content of CuO was 0.5 mol%, the maximum shear strength of the joint was 55 MPa.https://www.mdpi.com/2075-4701/13/9/1561reactive air brazingAg-CuOwettabilityinfiltration layerresidual stress |
| spellingShingle | Yongwei Chen Qiang Ma Peng He Study on Reactive Air Brazing of p-SiO<sub>2</sub> Ceramic with Ag-xCuO Filler Metal Metals reactive air brazing Ag-CuO wettability infiltration layer residual stress |
| title | Study on Reactive Air Brazing of p-SiO<sub>2</sub> Ceramic with Ag-xCuO Filler Metal |
| title_full | Study on Reactive Air Brazing of p-SiO<sub>2</sub> Ceramic with Ag-xCuO Filler Metal |
| title_fullStr | Study on Reactive Air Brazing of p-SiO<sub>2</sub> Ceramic with Ag-xCuO Filler Metal |
| title_full_unstemmed | Study on Reactive Air Brazing of p-SiO<sub>2</sub> Ceramic with Ag-xCuO Filler Metal |
| title_short | Study on Reactive Air Brazing of p-SiO<sub>2</sub> Ceramic with Ag-xCuO Filler Metal |
| title_sort | study on reactive air brazing of p sio sub 2 sub ceramic with ag xcuo filler metal |
| topic | reactive air brazing Ag-CuO wettability infiltration layer residual stress |
| url | https://www.mdpi.com/2075-4701/13/9/1561 |
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