High-Temperature Oxidation Resistance and Crack-Healing Function of Ni/Al2O3 Nano-Hybrid Materials

2010 ◽  
Vol 638-642 ◽  
pp. 2148-2153 ◽  
Author(s):  
Makoto Nanko
Keyword(s):  
High Temperature ◽  
Oxidation Resistance ◽  
High Temperatures ◽  
Hybrid Materials ◽  
High Temperature Oxidation ◽  
The Other ◽  
High Temperature Annealing ◽  
Crack Healing ◽  
Temperature Oxidation ◽  
Co Dispersion

High-temperature oxidation resistance of Ni/Al2O3 nano-hybrid materials was described in this paper. Y2O3 doping and SiC co-dispersion in Ni/Al2O3 nano-hybrid materials are useful techniques to improve high-temperature oxidation resistance. On the other hand, nano-Ni/Al2O3 has the crack healing function by high-temperature annealing in air. SiC-Ni/Al2O3 nano-hybrid materials have similar crack healing performance with better oxidation resistance at high temperatures than Ni/Al2O3 nano-hybrid materials.

Crack Healing of Nano-Ni/Al2O3 Hybrid Materials via High-Temperature Oxidation

2011 ◽  
Vol 696 ◽  
pp. 378-383 ◽  
Author(s):  
Daisuke Maruoka ◽  
Makoto Nanko
Keyword(s):  
High Temperature ◽  
Hybrid Materials ◽  
High Temperature Oxidation ◽  
Bending Strength ◽  
Crack Healing ◽  
Temperature Oxidation ◽  
Outward Diffusion ◽  
Si Doping ◽  
Si Doped ◽  
Co Dispersion

Crack-healing effectiveness was investigated on 5 vol% nano-Ni dispersed Al2O3hybrid materials. Influence of the Y or Si doping or SiC co-dispersion was also studied on the crack healing behavior. Cracks were introduced by a Vickers indentation to be a crack length of approximately 60 μm. Cracks of nano-Ni/Al2O3were completely disappeared, for example, by oxidation at 1200°C for 6 h in air, Y/Si doped one and SiC co-dispersed one have similar performance of crack disappearance. Bending strength of crack-disappeared samples showed about 550 MPa and was comparable or improved with that of as-sintered one. Mechanism of crack healing was considered as filling up of cracks by NiAl2O4oxidation product which is developed by outward diffusion of cations at grain boundary of Al2O3matrix. Nano-Ni/Al2O3with Y or Si doping or SiC co-dispersion are realized to have crack-healing effectiveness with improved high-temperature oxidation resistance.

Oxidation Behaviour of Nickel-Based Alloys Containing High Re Contents Comparable to the Third Generation Nickel-Based Superalloys

2004 ◽  
Vol 449-452 ◽  
pp. 349-352 ◽  
Author(s):  
Yoshinori Murata ◽  
Masahiko Morinaga ◽  
Ryokichi Hashizume
Keyword(s):  
High Temperature ◽  
Oxidation Resistance ◽  
High Temperature Oxidation ◽  
Oxidation Behaviour ◽  
The Other ◽  
Third Generation ◽  
Temperature Oxidation ◽  
Oxidation Test ◽  
Al Content ◽  
The Third

In order to elucidate the Re effect on oxidation resistance, a high-temperature oxidation test was conducted with two groups of Ni-based superalloys. One group of alloys was characterized by 10mol%Al content (10-Al series). The other group of alloys was characterized by 15mol%Al content (15-Al series). The oxidation resistance decreased clearly with increasing Re content in the 10-Al series alloys, but did not in the 15-Al series alloys.

Performance of TC4 Titanium Alloys Coated with Different Sol

2009 ◽  
Vol 75 ◽  
pp. 67-70
Author(s):  
Hui Cong Liu ◽  
Li Qun Zhu ◽  
Wei Ping Li
Keyword(s):  
Corrosion Resistance ◽  
High Temperature ◽  
Titanium Alloys ◽  
Oxidation Resistance ◽  
Anodic Oxidation ◽  
High Temperature Oxidation ◽  
The Other ◽  
Temperature Oxidation ◽  
Insulation Effect ◽  
Zro2 Sol

Titanium alloys has been widely used in many fields, while in high temperature and rigorous corrosive environment, it is very necessary to do some work on the surface of titanium alloys to satisfy with application purpose. In this paper, four kinds of sol film were prepared on titanium alloys with and without anodic oxidation film. The prepared sol included Al2O3, Al2O3-ZrO2 and doped sol by adding additive into them respectively. The film thickness, high temperature oxidation resistance and corrosion resistance after high temperature oxidation for some time were investigated. The results show that the sol film obtained on the anodic oxidation film of titanium alloys is thicker than that without anodic oxidation film. Compared with the other three kinds of film, the doped Al2O3-ZrO2 sol film has the best high temperature oxidation resistance and corrosion resistance due to insulation effect of the sol film, and the composition of additive and zirconic.

AK STEEL 441

Alloy Digest ◽  
2006 ◽  
Vol 55 (6) ◽  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Tensile Properties ◽  
Oxidation Resistance ◽  
Ferritic Stainless Steel ◽  
High Temperature Oxidation ◽  
High Temperature Strength ◽  
Temperature Oxidation ◽  
Temperature Performance

Abstract AK Steel 441 has good high-temperature strength, an equiaxed microstructure, and good high-temperature oxidation resistance. The alloy is a niobium-bearing ferritic stainless steel. This datasheet provides information on composition, hardness, and tensile properties as well as deformation. It also includes information on high temperature performance and corrosion resistance as well as forming and joining. Filing Code: SS-965. Producer or source: AK Steel.

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