scholarly journals Surface Heterostructure of Aluminum with Carbon Nanotubes Obtained by Laser-Oriented Deposition

Coatings ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 674
Author(s):  
Natalia Kamanina ◽  
Konstantin Borodianskiy ◽  
Dmitry Kvashnin
Keyword(s):  
Carbon Nanotubes ◽  
Slight Reduction ◽  
Metallic Materials ◽  
Deposition Technique ◽  
Ferrous Alloys ◽  
Main Drawback ◽  
Modified Surface

Al is one of the most widely applicable metallic materials due to its advanced properties. However, its main drawback is its strength, which is relatively low compared to ferrous alloys. This issue may be resolved using different approaches. In the present work, a heterostructure of Al substrate with a modified surface with carbon nanotubes (CNTs) was studied. This heterostructure was obtained using the laser-oriented deposition technique. The obtained results showed a slight reduction in the reflectivity of the obtained Al substrate with embedded CNTs compared to pure Al. Additionally, the obtained surface heterostructure showed enhancement in microhardness and higher hydrophobicity. Simulation of the CNT embedding process revealed that CNT penetration strongly depends on the diameter. Hence, the penetration increases when the diameter decreases.

scholarly journals Deep Cryogenic Treatment of Metallic Materials

2020 ◽  
Author(s):  
Patricia Jovičević-Klug ◽  
Bojan Podgornik
Keyword(s):  
Crystal Structure ◽  
Heat Treatment ◽  
Corrosion Resistance ◽  
Cryogenic Treatment ◽  
Metallic Materials ◽  
Size Change ◽  
Ferrous Alloys ◽  
Deep Cryogenic Treatment ◽  
Ferrous Metals ◽  
Proper Material

Deep cryogenic treatment (DCT) is a type of cryogenic treatment, where a metallic material is subjected to temperatures below -150°C, normally to temperatures of liquid nitrogen (-196 °C). When a material is exposed to DCT as a part of heat treatment, changes in microstructure are induced due to new grain formation, changes in grain size, change in the solubility of atoms, movement of dislocations, alteration of crystal structure, and finally new phase formation. The metallic material's performance and later performance of manufactured components and tools from this specific material are dependent on the selection of proper design, proper material, accuracy with which the tool is made and application of proper heat treatment, including any eventual DCT. Metallic materials are ferrous and non-ferrous metals. In the last years ferrous metals (different grades of steel) and non-ferrous alloys (aluminum, magnesium, titanium, nickel etc.) have been increasingly treated with DCT to alter their properties. DCT treatment has shown to reduce density of defects in crystal structure, increase wear resistance of material, increase hardness, improve toughness, and reduce tensile strength and corrosion resistance. However, some researchers also reported results showing no change in properties (toughness, hardness, corrosion resistance, etc.) or even deterioration when subjected to DCT treatment. This leads to a lack of consistency and reliability of the treatment process, which is needed for successful application in industry. This review provides a synopsis of DCT usage and resulting effects on treated materials used in automotive industry.

Synthesis of Large Carbon Nanotubes from Ferrocene: The Chemical Vapour Deposition Technique

2011 ◽  
Vol 6 (11) ◽  
pp. 1270-1279 ◽  
Author(s):  
Clarence S. Yah ◽  
Geoffrey S. Simate ◽  
Kapil Moothi ◽  
Kwena S. Maphutha ◽  
Sunny E. Iyuke
Keyword(s):  
Carbon Nanotubes ◽  
Chemical Vapour Deposition ◽  
Vapour Deposition ◽  
Chemical Vapour ◽  
Deposition Technique ◽  
Chemical Vapour Deposition Technique
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