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Korean Journal of Metals and Materials > Volume 55(12); 2017 > Article
Korean Journal of Metals and Materials 2017;55(12): 836-844. doi: https://doi.org/10.3365/KJMM.2017.55.12.836
AISI 304 Steel Brazing Using A Flexible Brazing Foil Fabricated by Tape Casting Method
Ashutosh Sharma1, Soon-Jae Lee1, Joo-Hee Oh2, Jae Pil Jung1
1Dept. of Materials Science and Engineering, University of Seoul, Seoul 02504, Republic of Korea
2Korea Chemtech Co., Suwon 16681, Republic of Korea
Correspondence  Jae Pil Jung ,Tel: +82-2-6490-2408, Email: jpjung@uos.ac.kr
Received: 29 May 2017;  Accepted: 14 September 2017.  Published online: 4 December 2017.
ABSTRACT
The authors report the fabrication of a flexible nickel brazing foil using powdered nickel alloy filler (BNi-2) mixed with an organic binder. The organic binder was composed of a polyacrylic acid polymer, glycol, carbon tetrachloride, and water as a dispersion medium for the powder. The brazing paste so formed was then tape-cast on a polymer foil with different polymer to paste (dispersant) ratios, of ≈ 9:1, 8:2 and 7:3 by weight, and was dried in a low-temperature oven. The filler pyrolysis temperature, paste spreading, permeability, and wettability were examined. The thermal analysis results showed that the filler paste decomposition temperature was in the range of 463-498 ℃, while the tape-cast brazing foil had a pyrolysis temperature of ≈334.36 ℃. The resulting flexible self-adhesive foil was used to braze steel foils. The AISI 304 steel joint microstructure and joint tensile shear tests were also performed. It was found that the brazing foil produced ≈1 wt% of residue after melting. The microstructural analysis showed a uniform distribution of a Cr-rich in Ni-rich matrix at a polymer to dispersant ratio of 8:2. It is suggested that the wettability of the brazing foil on AISI 304 steel will be maximum, and a higher joint strength can be obtained when the polymer to dispersant ratio is kept at 8:2.
Keywords: joining, brazing, stainless steel, adhesives, thermal analysis, flexible.
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