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Metals 2018, 8(10), 752; https://doi.org/10.3390/met8100752

Effect of Bonding Temperature on Crack Occurrences in Al2O3/SS 430 Joints Using Cu-Based Brazing Alloys

1
Department of Materials Science and Engineering, Pusan National University (PNU), Pusan 46241, Korea
2
Materials Research Division, Research Institute of Industrial Science and Technology (RIST), Pohang 37673, Korea
*
Authors to whom correspondence should be addressed.
Received: 3 September 2018 / Revised: 18 September 2018 / Accepted: 20 September 2018 / Published: 23 September 2018
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Abstract

The effect of bonding temperature on crack occurrences in α-Al2O3/SS 430 joints using Cu-based brazing alloys was investigated with emphasis on the microstructural characterization, hardness, and analytical residual stresses of the joints. The brazing was conducted using Cu-7Al-xTi and Cu-7Al-xZr (x = 2.5, 3.5, and 4.5) alloys at 1000 °C and 1080 °C leading to solid–liquid and liquid-state bonding, respectively. Cracks occurred in the joints brazed at 1080 °C irrespective of the alloys, while crack-free joints were obtained at 1000 °C for joints with only Cu-7Al-xZr alloys. Increases in the bonding temperature or utilization of Cu-7Al-xTi alloys led to a formation of brittle Fe-containing intermetallic or Fe-Cr phases in the brazed seams due to the dissolution of Fe from SS 430, which deteriorated the mechanical properties of the brazed seam. Maximum residual stresses of the real brazed joint were obtained by combining the calculated yield strength and measured hardness of the brazed seams. Eventually, when the hardness of the brazed seam was less than 107 Hv, the yield strength was 124 MPa or less and the maximum residual stress generated in the joint corresponded to 624 MPa or less, leading to a crack-free joint. View Full-Text
Keywords: ceramic-metal joining; brazing; residual stress; edge crack; hardness; microstructure ceramic-metal joining; brazing; residual stress; edge crack; hardness; microstructure
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Heo, H.; Kim, G.; Park, Y.-C.; Jung, K.; Kang, C.-Y. Effect of Bonding Temperature on Crack Occurrences in Al2O3/SS 430 Joints Using Cu-Based Brazing Alloys. Metals 2018, 8, 752.

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