Laser cladding of Al2O3 coating on aluminium alloy by thermite reactions

2005 ◽  
Vol 194 (2-3) ◽  
pp. 232-237 ◽  
Author(s):  
T.M. Yue ◽  
K.J. Huang ◽  
H.C. Man
Keyword(s):  
Aluminium Alloy ◽  
Laser Cladding ◽  
Al2o3 Coating

Influence of the Zinc Sublayer Method Production and Heat Treatment on the Microhardness of the Composite Ni-Al2O3 Coating Deposited on the 5754 Aluminium Alloy

2014 ◽  
Vol 59 (1) ◽  
pp. 355-358
Author(s):  
M. Karaś ◽  
M. Nowak ◽  
M. Opyrchał ◽  
M. Bigaj ◽  
A. Najder
Keyword(s):  
Heat Treatment ◽  
Aluminium Alloy ◽  
Thermal Shock ◽  
Nickel Coating ◽  
Nickel Sulphate ◽  
Al2o3 Coating ◽  
Nickel Coatings ◽  
Watts Bath ◽  
Before And After ◽  
Zinc Interlayer

Abstract In this study, the effect of zinc interlayer on the adhesion of nickel coatings reinforced with micrometric Al2O3 particles was examined. Nickel coating was applied by electroplating on EN AW - 5754 aluminium alloy using Watts bath at a concentration of 150 g/l of nickel sulphate with the addition of 50 g/l of Al2O3. The influence of zinc intermediate coating deposited in single, double and triple layers on the adhesion of nickel coating to aluminium substrate was also studied. The adhesion was measured by the thermal shock technique in accordance with PN-EN ISO 2819. The microhardness of nickel coating before and after heat treatment was additionally tested. It was observed that the number of zinc interlayers applied does not significantly affect the adhesion of nickel which is determined by thermal shock. No defect that occurs after the test, such as delamination, blistering or peeling of the coating was registered. Microhardness of the nickel coatings depends on the heat treatment and the amount of zinc in the interlayer. For both single and double zinc interlayer, the microhardness of the nickel coating containing Al2O3 particles increased after heat treatment, but decreased when a triple zinc interlayer was applied.

Diode Laser Cladding on A5052 Aluminium Alloy for Wear Resistance

2005 ◽  
Author(s):  
Shingo Iwatani ◽  
Yasuhito Ogata ◽  
Keisuke Uenishi ◽  
Kojiro F. Kobayashi ◽  
Akihiko Tsuboi
Keyword(s):  
Wear Resistance ◽  
Aluminium Alloy ◽  
Diode Laser ◽  
Laser Cladding ◽  
Co2 Laser ◽  
Reaction Layer ◽  
Heat Input ◽  
Aluminium Content ◽  
Alloy Substrate ◽  
Clad Layer

In order to improve a wear resistance of aluminium alloy, we proposed a diode laser cladding on the surface of a A5052 aluminium alloy. Firstly, an applicability of diode laser to laser cladding was evaluated. In this result, application of diode laser made it possible to obtain stable beads in low heat input compared with CO2 laser. According to the increase in aluminium content in the obtained clad layer, the microstructure of the clad layer changed as γ (8∼20%) → γ + α (10∼30%) → Fe3Al (30%∼). At the interface between the clad layer and the aluminium alloy substrate, the reaction layer consisting of Fe2Al5 and FeAl3 formed. In the abrasion wear the obtained clad layers exhibited a higher wear resistance compared with the aluminium alloy.

Crack resistance behaviour of aluminium alloy for aircraft skin with bionic coupling units processed by laser cladding

2020 ◽  
Vol 43 (11) ◽  
pp. 2756-2760
Author(s):  
Jiaming Liu ◽  
Lushen Wu ◽  
Minjie Song ◽  
Yun Hu ◽  
Min Lei ◽  
...  
Keyword(s):  
Crack Resistance ◽  
Aluminium Alloy ◽  
Laser Cladding ◽  
Aircraft Skin ◽  
Bionic Coupling

scholarly journals New Copper Based Composite for Engine Valve Seat Directly Deposited onto Aluminium Alloy by Laser Cladding Process

1993 ◽  
Vol 57 (10) ◽  
pp. 1114-1122 ◽  
Author(s):  
Kouji Tanaka ◽  
Takashi Saito ◽  
Yoshio Shimura ◽  
Kazuhiko Mori ◽  
Minoru Kawasaki ◽  
...  
Keyword(s):  
Aluminium Alloy ◽  
Laser Cladding ◽  
Valve Seat ◽  
Engine Valve ◽  
Laser Cladding Process

Fatigue Life Improvement of Laser Clad 7075 Aluminium Alloy by Deep Surface Rolling Technique

2014 ◽  
Vol 891-892 ◽  
pp. 115-120
Author(s):  
Qian Chu Liu ◽  
Wyman Zhuang ◽  
Peter Khan Sharp
Keyword(s):  
Heat Treatment ◽  
Fatigue Life ◽  
Residual Stresses ◽  
Aluminium Alloy ◽  
Laser Cladding ◽  
High Strength ◽  
Post Heat Treatment ◽  
Deep Surface ◽  
Life Improvement ◽  
Compressive Residual Stresses

The Deep Surface Rolling (DSR) technology can substantially increase the fatigue life of metallic materials due to the introduction of deep compressive residual stresses in the material surface. These beneficial compressive residual stresses can be achieved up to a depth of 1 mm. The DSR technology also produces a good surface finish unlike bead peening technology. In this study, the main objectives were: (1) to study the feasibility of DSR for fatigue life improvement of high strength aluminium alloy (7075-T651) repaired with laser cladding technology, and (2) to investigate the effect of thermal stressing on the fatigue life improvement of DSR. Previously published results have shown that post-heat treatment of laser clad high strength Al alloy coupons improved their fatigue life. The experimental results in this paper show that the fatigue life was substantially increased using the DSR technique on laser clad 7075-T6 aluminium alloy compared to laser cladding alone and laser cladding followed by post heat treatment.

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