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.

Synthesis of Ni-CeO2 Nanocomposite Coatings by Electroforming

2012 ◽  
Vol 248 ◽  
pp. 48-53
Author(s):  
Ning Song Qu
Keyword(s):  
Wear Resistance ◽  
High Temperature ◽  
Oxidation Resistance ◽  
High Temperature Oxidation ◽  
Weight Percent ◽  
Ceo2 Nanoparticles ◽  
Nano Particles ◽  
Nanocomposite Coatings ◽  
Temperature Oxidation ◽  
Nickel Coatings

In this paper, the effect of CeO2 nanoparticles content in the bath on the weight percent of CeO2 particles, morphology, texture, and high temperature oxidation resistance of the nanocomposite coatings was examined. With a rise in the loadings of CeO2 particles in the bath from 10 gl-1 to 40 gl-1, the CeO2 particles weight percent in the nanocomposite coatings gradually increases. Further increased the loadings of particles in the bath to 50 gl-1, the weight percent reversely reduces. The maximum of CeO2 nano particles weight percent in the nanocomposite coatings is 4.98 wt% obtained at current density of 3 Adm-2 from the bath containing 40 gl-1 CeO2 particles. The high temperature oxidation resistance of Ni-CeO2 nanocomposite coatings significantly rise compared with that of bare nickel coatings, and enhanced with a rise in the loadings of CeO2 nano particles from 10 gl-1 to 30 gl-1. The wear resistance of deposits is also consist with the nanoparticles content in the bath。

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.

Electrodeposition of Ni-Based Coatings with the Addition of CeO2 Nano Particles

2012 ◽  
Vol 590 ◽  
pp. 45-50 ◽  
Author(s):  
Ning Song Qu
Keyword(s):  
Wear Resistance ◽  
High Temperature ◽  
Oxidation Resistance ◽  
Current Density ◽  
High Temperature Oxidation ◽  
Weight Percent ◽  
Nano Particles ◽  
Nanocomposite Coatings ◽  
Maximum Weight ◽  
Temperature Oxidation

In the present study, a new nanocomposite coatings, Ni-CeO2, has been prepared by electrodepositing. The effect of current density on the CeO2 particles included into the deposits, morphology, preferred orientation, wear resistance and high temperature oxidation resistance has been studied. The investigated results demonstrate that the weight percent of particles in the nanocomposite coatings varied with a rise in current density, and the maximum weight percent of CeO2 particles in the coatings is 4.97 wt% obtained at the current density of 1 Adm-2. The paper firstly presents that the high temperature oxidation resistance of nanocomposite coatings is closely related to the current density, at which the nanocomposite coatings were electrodeposited, and the best high temperature oxidation resistance was acquired at the current density of 1 Adm-2

Properties of highly crystalline NiO and Ni nanoparticles prepared by high-temperature oxidation and reduction

2010 ◽  
Vol 81 (1) ◽  
Author(s):  
Mikhail Feygenson ◽  
Angela Kou ◽  
Lauren E. Kreno ◽  
Amanda L. Tiano ◽  
Jonathan M. Patete ◽  
...  
Keyword(s):  
High Temperature ◽  
High Temperature Oxidation ◽  
Ni Nanoparticles ◽  
Temperature Oxidation

Research of Characteristics of Ni-W-P Nanocomposites Containing CeO2 and SiO2 Particles

2010 ◽  
Vol 97-101 ◽  
pp. 1317-1320 ◽  
Author(s):  
Jun Li Wang ◽  
Rui Dong Xu ◽  
Yu Zhi Zhang
Keyword(s):  
Heat Treatment ◽  
High Temperature Oxidation ◽  
Treatment Temperature ◽  
Nano Particles ◽  
Temperature Oxidation ◽  
Structures And Properties ◽  
Growth Increase ◽  
Sio2 Nanocomposites ◽  
Surface Morphologies ◽  
Oxidation Weight Gain

Ni-W-P-CeO2-SiO2 nanocomposites were pulse electrodeposited from the bath containing suspension of nano-sized CeO2 and SiO2 particles. The influence of heat treatment temperature on the structures and properties were studied. The phase structures, surface morphologies, microhardness and oxidation behavior were evaluated by XRD, SEM, microhardness and oxidation weight gain test. Additionally, the sequence of phase transformation of the nanocomposites was found to be as follows: amorphous phase→intermediate metastable→stable alloy phase. Nano-particles co-deposited into Ni-W-P alloy can inhabit the grains growth, increase microhadness and high temperature oxidation resistance during the course of heat treatment.

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