Carbon Nanotube Reinforced Aluminum Nanocomposite via Plasma and High Velocity Oxy-Fuel Spray Forming

2007 ◽  
Vol 7 (2) ◽  
pp. 515-524 ◽  
Author(s):  
T. Laha ◽  
Y. Liu ◽  
A. Agarwal
Keyword(s):  
Carbon Nanotubes ◽  
High Velocity ◽  
Thermal Spraying ◽  
Spray Forming ◽  
Al Alloy ◽  
Free Standing ◽  
Multiwalled Carbon ◽  
Alloy Matrix ◽  
Property Evaluation ◽  
Hvof Spray

Free standing structures of hypereutectic aluminum-23 wt% silicon nanocomposite with multiwalled carbon nanotubes (MWCNT) reinforcement have been successfully fabricated by two different thermal spraying technique viz Plasma Spray Forming (PSF) and High Velocity Oxy-Fuel (HVOF) Spray Forming. Comparative microstructural and mechanical property evaluation of the two thermally spray formed nanocomposites has been carried out. Presence of nanosized grains in the Al–Si alloy matrix and physically intact and undamaged carbon nanotubes were observed in both the nanocomposites. Excellent interfacial bonding between Al alloy matrix and MWCNT was observed. The elastic modulus and hardness of HVOF sprayed nanocomposite is found to be higher than PSF sprayed composites.

Carbon Nanotube Reinforced Aluminum Nanocomposite via Plasma and High Velocity Oxy-Fuel Spray Forming

2007 ◽  
Vol 7 (2) ◽  
pp. 515-524 ◽  
Author(s):  
T. Laha ◽  
Y. Liu ◽  
A. Agarwal
Keyword(s):  
Carbon Nanotubes ◽  
High Velocity ◽  
Thermal Spraying ◽  
Spray Forming ◽  
Al Alloy ◽  
Free Standing ◽  
Multiwalled Carbon ◽  
Alloy Matrix ◽  
Property Evaluation ◽  
Hvof Spray

Free standing structures of hypereutectic aluminum-23 wt% silicon nanocomposite with multiwalled carbon nanotubes (MWCNT) reinforcement have been successfully fabricated by two different thermal spraying technique viz Plasma Spray Forming (PSF) and High Velocity Oxy-Fuel (HVOF) Spray Forming. Comparative microstructural and mechanical property evaluation of the two thermally spray formed nanocomposites has been carried out. Presence of nanosized grains in the Al–Si alloy matrix and physically intact and undamaged carbon nanotubes were observed in both the nanocomposites. Excellent interfacial bonding between Al alloy matrix and MWCNT was observed. The elastic modulus and hardness of HVOF sprayed nanocomposite is found to be higher than PSF sprayed composites.

Thermal Spray Forming Using the HVOF Technique

1997 ◽  
Author(s):  
J.M. Guilemany ◽  
J.R. Miguel ◽  
M.J. Dougan ◽  
J.M. de Paco ◽  
Z. Dong ◽  
...  
Keyword(s):  
Thermal Spray ◽  
Spray Forming ◽  
Homogeneous Distribution ◽  
Material Decomposition ◽  
Hvof Spraying ◽  
Free Standing ◽  
Hvof Spray ◽  
The Matrix ◽  
Low Levels ◽  
Microstructural Examination

Abstract The feasibility of using the HVOF process for the thermal spray-forming of free-standing components has been investigated. HVOF spray forming offers a number of potential advantages compared to the established procedure of plasma forming, including increases in component density, and reduction in material decomposition during spraying. Using blends of carbide and superalloy powders in various proportions, HVOF spraying has been successfully used to form free-standing cylinders and cones of various lengths and thicknesses. Microstructural examination of the spray-formed material has shown a homogeneous distribution of carbides in the superalloy matrix, with very low levels of porosity. Refinement of the procedure has allowed reduction of the matrix content, and the forming of fragile materials.

Deformation and damage mechanisms of multiwalled carbon nanotubes under high-velocity impact

2008 ◽  
Vol 59 (5) ◽  
pp. 499-502 ◽  
Author(s):  
Srinivasa R. Bakshi ◽  
Virendra Singh ◽  
D. Graham McCartney ◽  
Sudipta Seal ◽  
Arvind Agarwal
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
High Velocity ◽  
High Velocity Impact ◽  
Multiwalled Carbon ◽  
Damage Mechanisms ◽  
Velocity Impact

scholarly journals Spray Forming of FeSi2 Thermoelectric Material by High-velocity Oxy-fuel Thermal Spraying.

2000 ◽  
Vol 47 (11) ◽  
pp. 1175-1178 ◽  
Author(s):  
Kazuo Ueno ◽  
Shuhei Nakahama ◽  
Hideki Kondo ◽  
Kazutoshi Nagai ◽  
Rei Kiumi ◽  
...  
Keyword(s):  
Thermoelectric Material ◽  
High Velocity ◽  
Thermal Spraying ◽  
Spray Forming

Microstructure and Properties of Al-Zn-Mg-Cu-Mn In Situ High Strength Alloy

2007 ◽  
Vol 561-565 ◽  
pp. 957-960
Author(s):  
Yuan Hua Cai ◽  
Hua Cui ◽  
Yong Bing Li ◽  
Jing Feng Hang ◽  
Ji Shan Zhang
Keyword(s):  
Solid Solution ◽  
Hot Extrusion ◽  
High Strength ◽  
Spray Forming ◽  
Al Alloy ◽  
Forming Process ◽  
Alloy Matrix ◽  
Strength Alloy ◽  
Average Size ◽  
Boundary Deformation

Al-Zn-Mg-Cu alloy containing 2%Mn was made using spray forming method and hot extrusion. XRD, OM, and SEM were used to investigate the microstructure. Results showed that after being hot extruded and solid solution treated, the Al alloy matrix had uniformly fine recrystallized grain with an average size of 8μm. The particles of MnAl6 were formed during the spray forming process and distributed along the grain boundary. Deformation and spheroidization of MnAl6 particles were occurred during post hot extrusion and solid solution treament, which would be benefit to the improvement of toughness of Al alloy. When aged at the T6 conditions, the tensile strength of the Al alloy was increased up to 775MPa with the elongation of 4.3%, the fracture surface consisted mainly of dimples with a size lower than 500nm.

Obtention and Development of Blends of Powder to Obtain Free-Standing Components Produced by HVOF Spray-Forming

1998 ◽  
Author(s):  
J.M. Guilemany ◽  
J.M. De Paco ◽  
J.R. Miguel ◽  
J. Llibre
Keyword(s):  
Spray Forming ◽  
Homogeneous Distribution ◽  
Material Decomposition ◽  
Hvof Spraying ◽  
Free Standing ◽  
Hvof Process ◽  
Hvof Spray ◽  
Low Levels ◽  
Disk Test ◽  
Microstructural Examination

Abstract The feasibility of using the HVOF process for the thermal spray-forming of free-standing components has been investigated. HVOF spray forming offers a number of potential advantages compared to the established procedure of plasma forming, including increases in component density, and reduction in material decomposition during spraying. Using blends of carbide and superalloy powders in various proportions, HVOF spraying has been successfully used to form free-standing cylinders and cones of various lengths and thicknesses. Microstructural examination of the spray-formed material, using optical microscopy and scanning electron microscopy (SEM), has shown a homogeneous distribution of carbides in the superalloy matrix, with very low levels of porosity. Vickers microhardness has been measured on several sprayed forms. In order to complete the study of the different systems, abrasion (Rubber Wheel Test), friction (Ball on Disk Test) and erosion wear results have been obtained. These wear results have been used in order to evaluate the behaviour of the sprayed samples with a different powder percentage in the blends. Corrosion tests have been done to evaluate the corrosion resistance of the sprayed samples (ASTM D-1411).

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