Minimization of High Temperature Oxidation, Aluminum Alloy Heat Treatment

2020 ◽  
Author(s):  
Keyword(s):  
Heat Treatment ◽  
Aluminum Alloy ◽  
High Temperature ◽  
High Temperature Oxidation ◽  
Temperature Oxidation ◽  
Alloy Heat

Microstructure and High-Temperature Oxidation of Ni-Si3N4 Composite Coatings by Pulse Electrodeposition

2015 ◽  
Vol 817 ◽  
pp. 421-425
Author(s):  
Kun Zhao ◽  
Wan Chang Sun ◽  
Chun Yu Miao ◽  
Hui Cai ◽  
Ju Mei Zhang ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
High Temperature ◽  
Oxidation Resistance ◽  
High Temperature Oxidation ◽  
Composite Coatings ◽  
X Ray Diffraction ◽  
Temperature Oxidation ◽  
Electro Deposition ◽  
X Ray ◽  
Crystallite Structure

Nickel matrix and Si3N4 micron particles were co-deposited on the aluminum alloy by pulse electro-deposition for high temperature performance. Meanwhile, the oxidation resistance was evaluated through the high temperature oxidation test. The phase structure, micrographs and components of the composite coatings were investigated by means of X-ray diffraction (XRD), scanning electron microscopy (SEM) together with energy dispersive spectroscopy (EDS) respectively. The results indicated that Si3N4 particles were uniformly distributed across the coating and there were no pores and cracks or other defects at the coating/substrate interface. Ni-Si3N4 composite coatings are characterized by pyramidal micro-crystallite structure. The thickness of Ni-Si3N4 composite coatings were up to 80 μm for 2h. The results also revealed that the Ni-Si3N4 composite coatings presented better oxidation resistance than the pure Ni coating and aluminum alloy at high temperature. After oxidation at 673 K for 8h, the oxidation resistance of Ni-Si3N4 composite coatings presented the improved oxidation resistance behavior compared to pure Ni and the aluminum alloy, respectively.

Crack Disappearance by High-Temperature Oxidation of Alumina Toughened by Ni Nano-Particles

2009 ◽  
Vol 68 ◽  
pp. 34-43 ◽  
Author(s):  
Ana L. Salas-Villaseñor ◽  
José Lemus-Ruiz ◽  
Makoto Nanko ◽  
Daisuke Maruoka
Keyword(s):  
Heat Treatment ◽  
High Temperature ◽  
Oxidation Reaction ◽  
High Temperature Oxidation ◽  
Annealing Temperature ◽  
Nano Particles ◽  
Ni Nanoparticles ◽  
Temperature Oxidation ◽  
Oxidation Period ◽  
Higher Temperature

Crack disappearance by high-temperature oxidation was studied in alumina (Al2O3) composites toughened by Ni nanoparticles. This process is performed in air at temperature ranging from 1000 to 1300°C for 1 to 48 h. The results showed that crack disappearance depends on both annealing temperature and time. Complete crack disappearance in this composite was confirmed at lower temperatures for long oxidation period, 1100oC for 48 h, and higher temperature for shorter time, 1300oC for 1 h in air. The crack disappearance mechanism was explained on the basis of the formation of NiAl2O4 spinel on sample surfaces produced by the oxidation reaction during the heat treatment.

Corrosion Resistance Of fe- and Ni- Based Metallic Glasses

1983 ◽  
Vol 28 ◽  
Author(s):  
B.-O. Reinders ◽  
H. W. Bergmann
Keyword(s):  
Heat Treatment ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Metallic Glasses ◽  
High Temperature Oxidation ◽  
Ph Value ◽  
Corrosion Behaviour ◽  
Oxidation Behaviour ◽  
Electrolyte Temperature ◽  
Temperature Oxidation

ABSTRACTThe corrosion behaviour in liquid electrolytes were investigated for some Fe- and Ni-based metallic glasses varying pH-value, electrolyte temperature and heat treatment. For some (Fe100-xMx)83B17 glasses the high temperature oxidation behaviour was studied.

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