The Effect of Surface Condition on Wetting of HASTELLOY{sup ®} X by Brazing Filler Metal of Ni-Pd-Cr-B-Si System
- Institute of Precision Mechanics (Poland)
- Warsaw University of Technology, Department of Welding Engineering (Poland)
- Foundry Research Institute (Poland)
The paper presents the results of wettability tests by a sessile drop method coupled with residual gas analysis for the HASTELLOY{sup ®} X substrates contact heated with brazing filler metal of Palnicro 36M. The contact angles formed between the substrate and the molten brazing filler metal were recorded by high-speed high-resolution CCD camera using two different heating procedures: (1) fast continuous heating to a temperature of 960 °C; (2) isothermal heating at a temperature of 995 °C for 10 min after step heating to the test temperature. In this study, the reference sample was HASTELLOY{sup ®} X in a delivery state (D1). The base material with a different surface finish was also tested: after polishing (P1), after polishing and oxidation at a temperature of 600 °C for 1 h in the air (U1). The tests confirmed very good wetting properties of Palnicro 36M on HASTELLOY{sup ®} X, independently on its surface finish and the heating procedure used in this study, i.e., after 10 min at 995 °C, the final contact angle values were θ{sub f} = 7.6 ± 0.1°, 6.03 ± 0.07° and 6.2 ± 1.0° for D1, P1 and U1, respectively. However, oxidation of HASTELLOY{sup ®} X surface affects the wetting kinetics and spreading of molten Palnicro 36M on BM substrates by: (1) increasing the initial contact angle values (θ{sub 0} = 51 ± 4°, 65 ± 13° and 83 ± 2° for D1, P1 and U1, respectively), (2) delaying the wetting process and (3) reducing the spreading area since after wettability tests at 960 °C, the largest area covered with solidified Palnicro 36M drop was noted for D1 (92 mm{sup 2}) while the smallest one for U1 (52 mm{sup 2}).
- OSTI ID:
- 22970687
- Journal Information:
- Journal of Materials Engineering and Performance, Vol. 28, Issue 7; Conference: 73. World Foundry Congress, Krakow (Poland), 23-27 Sep 2018; Other Information: Copyright (c) 2019 ASM International; Article Copyright (c) 2019 The Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 1059-9495
- Country of Publication:
- United States
- Language:
- English
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