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Materials Science-Poland
Volume 40 (2022): Numero 4 (December 2022)
Accesso libero
A new approach to flux deposition for brazing aluminium by low pressure cold spraying
Tomasz Wojdat
Tomasz Wojdat
,
Marcin Winnicki
Marcin Winnicki
e
Jaroslaw Pabian
Jaroslaw Pabian
| 20 apr 2023
Materials Science-Poland
Volume 40 (2022): Numero 4 (December 2022)
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CONDIVIDI
Pubblicato online:
20 apr 2023
Pagine:
114 - 124
Ricevuto:
10 gen 2023
Accettato:
08 mar 2023
DOI:
https://doi.org/10.2478/msp-2022-0048
Parole chiave
flux deposition
,
low-pressure cold spraying
,
aluminium alloy
,
brazing
,
flux powder
,
brazed joints
,
B-AlSi12 filler metal
© 2022 Tomasz Wojdat et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
Fig. 1
An exemplary roughness profile for the PFR 2 sample (DM). DM, digital microscope
Fig. 2
Micrographs (SEM, BSE) of flux coatings: (A) PFR 1 and (B) PFR 2. 1 – substrate (AA3003), 2 – flux (Nocolok) coating. SEM, scanning electron microscope
Fig. 3
Micrograph (SEM, BSE) of the PFR 3 coating. 1 – substrate (AA3003), 2 – flux (Nocolok) coating. SEM, scanning electron microscope
Fig. 4
(A) EDS analysis of the PFR 3 coating's surface and (B) elements distribution of aluminium, (C) fluorine and (D) potassium. Table – chemical composition of the coating depended on powder feed rate determined based on the surface EDS analysis. EDS, energy dispersive spectrometry
Fig. 5
Results of the B-AlSi12 filler metal spreadability on AA3003 substrates
Fig. 6
Results of the B-AlSi12 filler metal wettability test on AA3003 substrates
Fig. 7
Cross-section (DM) of brazed joints for various samples: (A) PFR 1, (B) PFR 2 and (C) PFR 3. DM, digital microscope
Fig. 8
Microstructure (SEM, BSE) of brazed joints (A) PFR 1, (B) PFR 2, (C) PFR 3 and phase precipitates of Si in the microstructure of (A) PFR1, (B) PFR 2 and (C) PFR 3 samples. 1 – solid solution dendrites α-Al, 2 – eutectic (α + Si), 3 – irregularly shaped intermetallic phase and 4 – coniferous Si phase precipitates. SEM, scanning electron microscope
Fig. 9
EDS of the PFR 1 sample presenting the (A) analysed region and (B) distribution of the elements: Si, (C) Fe, and (D) Mn (mag. 2,000×, 20 keV). EDS, elemental mapping
Fig. 10
SEM micrograph (BSE) of the PFR 1 sample with EDS analysis (magnification 2,000×, 20 keV). EDS, energy dispersive spectrometry; SEM, scanning electron microscope
LPCS process parameters during flux deposition
Powder feed rate, g/min
Traverse speed, mm/s
Gas preheating temperature, °C
Gas pressure, MPa
Standoff, mm
Number of spray passes
4.5
20
200
05
10
1
6.3
8.5
Results of roughness and thickness measurements
Parameter
Samples
PFR 1
PFR 2
PFR 3
Mean roughness
Ra
(μm)
16.1
24.3
35.7
Mean thickness
t
(μm)
5.3
16.2
83.5
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