FeAl2O4nano-rod array structures on Fe(Al) solid solution fabricated by internal oxidation process

2011 ◽  
Vol 20 ◽  
pp. 012013 ◽  
Author(s):  
D T M Do ◽  
M Nanko
Keyword(s):  
Solid Solution ◽  
Internal Oxidation ◽  
Oxidation Process ◽  
Array Structures ◽  
Rod Array

Fabrication of Oxide Nano-Rod Array Structures via Internal Oxidation of Alloys

2011 ◽  
Vol 696 ◽  
pp. 348-353
Author(s):  
Makoto Nanko
Keyword(s):  
Internal Oxidation ◽  
Solid Solutions ◽  
Metallic Matrix ◽  
Pack Cementation ◽  
Low Oxygen ◽  
Surface Layers ◽  
Partial Pressures ◽  
Array Structures ◽  
Near Net Shape ◽  
Rod Array

A simple metallurgical process for fabricating oxide nano-rod array structures via internal oxidation is described. Some dilute alloys such as Ni(Al) and Fe(Al) solid solutions develop rod-like oxide precipitates after their internal oxidation at high-temperatures and under low oxygen partial pressures. The oxide nano-rod array structure can be developed on the metal substrate by removing the metallic matrix of the internal oxidation zone. Al2O3orMAl2O4(M=Ni or Fe) spinel nano-rod array structures were prepared by usingM(Al) solid solutions. Pack cementation process to develop M(Al) solid solution surface layers was used for the fabrication of nano-rod array structures on substrates with desired shape. Near-net shape Ni substrates with oxide nano-rod array structures on their surfaces can be prepared by using pack cementation and internal oxidation.

Effects of some Parameters on Properties of Cu-Al2O3 Composite Materials Synthesized by Internal Oxidation Process

2019 ◽  
Vol 889 ◽  
pp. 38-42
Author(s):  
Ho Ky Thanh ◽  
Duc Duy Nguyen
Keyword(s):  
Solid Solution ◽  
Composite Materials ◽  
Internal Oxidation ◽  
Electrode Materials ◽  
Oxidation Process ◽  
Sintering Process ◽  
Micro Hardness ◽  
Xrd Patterns ◽  
Pure Cu ◽  
Cylindrical Samples

The Cu-Al2O3 composite materials applying for electrode materials were successfully synthesized by internal oxidation process. The process included steps: producing solid solution α-Cu[Al] and oxidizing completely solid solution α-Cu[Al] as powders, then adding pure Cu powders and mixing in planetary ball milling, the mixtures were compressed into cylindrical samples, reduced at 750°C in 3h and sintered at 950°C in 2h in reduction atmosphere. The XRD patterns showed that total Al in Cu-matrix were completely oxidized in range of 20¸25h. After reducing and sintering process, the final products were Cu-Al2O3 composite materials. The results showed that micro-hardness, porosity and compress strength of Cu-Al2O3 materials increased with increasing of Al2O3 content, which was the result of dispersion of the fined Al2O3 grains in Cu-matrix. When Al2O3 content was unchanged, the porosity of received materials decreased with increasing of compress pressure. Whereas, the electrical conductivity of Cu-Al2O3 composite materials decreased comparing with pure Cu and it decreased with increasing of Al2O3 content.

Fabrication of Cu-Al2O3 Composites by Simplified Internal Oxidation Process

2010 ◽  
Vol 148-149 ◽  
pp. 416-419
Author(s):  
Bao Hong Tian ◽  
Cheng Dong Xia ◽  
Shu Guo Jia
Keyword(s):  
Electrical Conductivity ◽  
Tensile Strength ◽  
Internal Oxidation ◽  
Oxidation Process ◽  
Hot Extrusion ◽  
Softening Temperature ◽  
Copper Matrix ◽  
Dispersion Strengthening ◽  
Powder Metallurgical Process ◽  
Thermal Stability Of

Cu-Al2O3 composites were prepared by a new simplified internal oxidation process integrating with powder metallurgical process, and then the hot extrusion and the cold rolling processes were carried out. The microstructure, electrical conductivity, hardness, tensile strength and thermal stability of the composites were investigated. The results show that Cu-Al2O3 composites were fabricated successfully by the simplified process in which internal oxidation completed during the sintering. There are a mass of fine Al2O3 particles in size varying from 5 nm to 20nm dispersed in copper matrix after sintering 950 for 4h. After sintered at 950 for 4h and extruded at 950 followed with the cold deforming of 80%, the electrical conductivity, hardness, tensile strength and softening temperature of composite reach 81％IACS, 137HV, 561MPa and 850 respectively. It is considered that the dispersion strengthening and strain hardening have greatly contribution to the Cu-Al2O3 composites fabricated with the simplified process.

Fabrication of Nanorod Array Structure by Using Aluminizing and Internal Oxidation of Ni with Micro-Channels

2013 ◽  
Vol 761 ◽  
pp. 131-134
Author(s):  
Takeshi Ishizaki ◽  
Dung Thi Mai Do ◽  
Makoto Nanko
Keyword(s):  
Internal Oxidation ◽  
Nanorod Array ◽  
Pack Cementation ◽  
Micro Channel ◽  
Electric Discharge Machining ◽  
Micro Channels ◽  
Channel Surface ◽  
Nano Rods ◽  
Array Structure ◽  
Rod Array

A metallurgical method for preparing oxide nano-rod array structure was developed with internal oxidation of Ni(Al) solid solution obtained by aluminizing Ni with a pack cementation technique. The present method was applied in order to fabricate nano-rod array on the micro-channel surface of microreactor. A micro-channel with 1 mm in depth, 1mm in width and 10 mm in length was fabricated on the Ni disk by an electric discharge machining and electropolishing. The Ni disk with a micro-channel was annealed at 1300°C for 12 h in vacuum. The sample was aluminized by a pack cementation using pack powder mixture consisting of 10 mass% of Ni3Al, 88 mass% of Al2O3 and 2 mass% of NaCl at 1100°C for 12 h in a flow of argon gas. The sample was oxidized from 1000 to 1200°C for 6 h with the Co/CoO buffer. Ni matrix in internally oxidized zone was removed by electropolishing to expose nano-rods. Al2O3 nano-rod array located on the micro-channel surface was successfully fabricated with the proposed technique. Diameter and height of nano-rods were ranged from 100 to 300 nm and from 1.5 to 3 µm, respectively.

scholarly journals The formation of solid solution oxides during internal oxidation

1981 ◽  
Vol 16 (1-2) ◽  
pp. 159-174 ◽  
Author(s):  
D. P. Whittle ◽  
F. Gesmundo ◽  
B. D. Bastow ◽  
G. C. Wood
Keyword(s):  
Solid Solution ◽  
Internal Oxidation
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