Formation of Interfacial Reaction Layers in Al<sub>2</sub>O<sub>3</sub>/SS 430 Brazed Joints Using Cu-7Al-3.5Zr Alloys
The formation of interfacial reaction layers was investigated in an α-Al<sub>2</sub>O<sub>3</sub>/430 stainless steel (SS430) joint brazed using a Cu-7Al-3.5Zr active brazing alloy. Brazing was conducted at above its eutectic temperature of 945 °C and below...
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MDPI AG
2018-11-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/8/12/990 |
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| author | Hoejun Heo Hyeonim Joung Keeyoung Jung Chung-Yun Kang |
| author_facet | Hoejun Heo Hyeonim Joung Keeyoung Jung Chung-Yun Kang |
| author_sort | Hoejun Heo |
| collection | DOAJ |
| description | The formation of interfacial reaction layers was investigated in an α-Al<sub>2</sub>O<sub>3</sub>/430 stainless steel (SS430) joint brazed using a Cu-7Al-3.5Zr active brazing alloy. Brazing was conducted at above its eutectic temperature of 945 °C and below liquidus 1045 °C, where liquid and solid phases of the brazing alloys coexists. At 1000 °C, the liquid phase of the brazing alloy was wet onto the α-Al<sub>2</sub>O<sub>3</sub> surface. Zr in the liquid phase reduced α-Al<sub>2</sub>O<sub>3</sub> to form a continuous ZrO<sub>2</sub> layer. As the dwell time increased, Zr in the liquid phases near α-Al<sub>2</sub>O<sub>3</sub> interface was used up to thicken the reaction layers. The growth kinetics of the layer obeys the parabolic rate law with a rate constant of 9.25 × 10<sup>−6</sup> cm·s<sup>−1/2</sup>. It was observed that a number of low yield strength Cu-rich particles were dispersed over the reaction layer, which can release the residual stress of the joint resulting in reduction of crack occurrence. |
| first_indexed | 2024-04-12T19:52:55Z |
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| id | doaj.art-287ddef982ea4ad5955d112979eed37e |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-04-12T19:52:55Z |
| publishDate | 2018-11-01 |
| publisher | MDPI AG |
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| series | Metals |
| spelling | doaj.art-287ddef982ea4ad5955d112979eed37e2022-12-22T03:18:45ZengMDPI AGMetals2075-47012018-11-0181299010.3390/met8120990met8120990Formation of Interfacial Reaction Layers in Al<sub>2</sub>O<sub>3</sub>/SS 430 Brazed Joints Using Cu-7Al-3.5Zr AlloysHoejun Heo0Hyeonim Joung1Keeyoung Jung2Chung-Yun Kang3Department of Materials Science and Engineering, Pusan National University (PNU), 46241 Pusan, KoreaDepartment of Materials Science and Engineering, Pusan National University (PNU), 46241 Pusan, KoreaMaterials Research Division, Research Institute of Industrial Science and Technology (RIST), 37673 Pohang, KoreaDepartment of Materials Science and Engineering, Pusan National University (PNU), 46241 Pusan, KoreaThe formation of interfacial reaction layers was investigated in an α-Al<sub>2</sub>O<sub>3</sub>/430 stainless steel (SS430) joint brazed using a Cu-7Al-3.5Zr active brazing alloy. Brazing was conducted at above its eutectic temperature of 945 °C and below liquidus 1045 °C, where liquid and solid phases of the brazing alloys coexists. At 1000 °C, the liquid phase of the brazing alloy was wet onto the α-Al<sub>2</sub>O<sub>3</sub> surface. Zr in the liquid phase reduced α-Al<sub>2</sub>O<sub>3</sub> to form a continuous ZrO<sub>2</sub> layer. As the dwell time increased, Zr in the liquid phases near α-Al<sub>2</sub>O<sub>3</sub> interface was used up to thicken the reaction layers. The growth kinetics of the layer obeys the parabolic rate law with a rate constant of 9.25 × 10<sup>−6</sup> cm·s<sup>−1/2</sup>. It was observed that a number of low yield strength Cu-rich particles were dispersed over the reaction layer, which can release the residual stress of the joint resulting in reduction of crack occurrence.https://www.mdpi.com/2075-4701/8/12/990ceramic-metal joiningbrazingactive brazing alloyinterfacezirconiamicrostructure |
| spellingShingle | Hoejun Heo Hyeonim Joung Keeyoung Jung Chung-Yun Kang Formation of Interfacial Reaction Layers in Al<sub>2</sub>O<sub>3</sub>/SS 430 Brazed Joints Using Cu-7Al-3.5Zr Alloys Metals ceramic-metal joining brazing active brazing alloy interface zirconia microstructure |
| title | Formation of Interfacial Reaction Layers in Al<sub>2</sub>O<sub>3</sub>/SS 430 Brazed Joints Using Cu-7Al-3.5Zr Alloys |
| title_full | Formation of Interfacial Reaction Layers in Al<sub>2</sub>O<sub>3</sub>/SS 430 Brazed Joints Using Cu-7Al-3.5Zr Alloys |
| title_fullStr | Formation of Interfacial Reaction Layers in Al<sub>2</sub>O<sub>3</sub>/SS 430 Brazed Joints Using Cu-7Al-3.5Zr Alloys |
| title_full_unstemmed | Formation of Interfacial Reaction Layers in Al<sub>2</sub>O<sub>3</sub>/SS 430 Brazed Joints Using Cu-7Al-3.5Zr Alloys |
| title_short | Formation of Interfacial Reaction Layers in Al<sub>2</sub>O<sub>3</sub>/SS 430 Brazed Joints Using Cu-7Al-3.5Zr Alloys |
| title_sort | formation of interfacial reaction layers in al sub 2 sub o sub 3 sub ss 430 brazed joints using cu 7al 3 5zr alloys |
| topic | ceramic-metal joining brazing active brazing alloy interface zirconia microstructure |
| url | https://www.mdpi.com/2075-4701/8/12/990 |
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