scholarly journals Research of effect of heat treatment on microhardness and wearing resistance of anodic oxide aluminum coatings modified by nano diamonds

2019 ◽  
Vol 64 (2) ◽  
pp. 157-165
Author(s):  
G. A. Gusakov ◽  
I. V. Gasenkova ◽  
N. I. Mukhurov ◽  
G. V. Sharonov
Keyword(s):  
Heat Treatment ◽  
Wear Resistance ◽  
Aluminum Alloy ◽  
Mechanical Characteristics ◽  
Surface Composition ◽  
Anodic Oxide ◽  
Anodic Alumina ◽  
Functional Surface ◽  
Ultradispersed Diamond ◽  
Radiation Resistant

Anodizing of aluminum and its alloys is widely used in various fields of science and technology. The process of modifying porous anodic aluminum oxide with ultradispersed diamond (UDD) particles to improve the mechanical characteristics of coatings requires additional study. UDD was modified by consistent heat treatment at 40 °C and 120 °C. The results of the UDD surface modification were controlled by IR spectroscopy. The surface state analysis was carried out using the PMT-3 microhardnessmeter, the SolverPro P47 atomic-force microscope (AFM), and the experimental probe-electrometry device. One of the ways to improve the mechanical characteristics of such coatings is the use of ultradispersed diamonds with respective pretreatment of their surface. The article presents the results of a study of the influence of additives of ultradispersed diamonds with different functional surface composition in an acid electrolyte to form coatings of porous anodic alumina on the surface of AMg-2 aluminum alloy substrates by electrochemical oxidation. An increase in the microhardness and wear resistance of anodic oxide coatings formed on aluminum alloy substrates after various post-growth heat treatments is noted. It is shown that using a combined method based on doping anodic alumina in the process of synthesis with modified ultradispersed diamonds and post-growth annealing of the coatings obtained in vacuum at T = 500 °C, it is possible to obtain a composite material that is 2 times higher in hardness and 3 times higher in wear resistance compared to the initial coating. The research results can be used to create a new generation of radiation-resistant heat-removing bases, nano and micromechanical devices, elements of passive and active electronics, high-quality parts for spacecraft and satellites on modern composite materials.

THE EFFECT OF ELECTROLYTE TEMPERATURE AND SEALING SOLUTION IN ANODIZING OPERATION ON HARDNESS AND WEAR BEHAVIOR OF 7075 -T6 ALUMINUM ALLOY

2019 ◽  
Vol 26 (02) ◽  
pp. 1850143
Author(s):  
SAEED NIYAZBAKHSH ◽  
KAMRAN AMINI ◽  
FARHAD GHARAVI
Keyword(s):  
Weight Loss ◽  
Wear Resistance ◽  
Aluminum Alloy ◽  
Wear Behavior ◽  
Anodic Oxide ◽  
Boiling Water ◽  
Electrolyte Temperature ◽  
Oxide Coatings ◽  
Sodium Dichromate ◽  
Pin On Disk

Anodic oxide coatings are applied on aluminum alloys in order to improve corrosion resistance and to increase hardness and wear resistance. In the current study, a hard anodic coating was applied on AA7075-T6 aluminum alloy. To survey the anodizing temperature (electrolyte temperature) effect, three temperatures, namely, [Formula: see text]C, 0∘C and 5∘C were chosen and the samples were sealed in boiling water and sodium dichromate to study the role of sealing. For measuring the oxide coatings porosity and hardness and also for comparing the samples’ wear resistance field-emission scanning electron microscopy (FESEM), microhardness test and pin-on-disk method were utilized, respectively. The results showed that by increasing the anodizing temperature, hardness and consequently wear resistance decreased so that hardness and weight loss in the samples with no sealing decreased from 460[Formula: see text]HV and 0.61[Formula: see text]mg at [Formula: see text]C to 405 and 358[Formula: see text]HV and 1.05 and 1.12[Formula: see text]mg at 0∘C and 5∘C, respectively, which is due to the porosity increment by increasing the anodizing temperature. Also, sealing in boiling water and dichromate contributed to soft phases and coating hydration, which resulted in a decrease in hardness and wear resistance. Hardness and weight loss in the coated samples at [Formula: see text]C decreased from 460[Formula: see text]HV and 0.61[Formula: see text]mg in the samples with no sealing to 435 and 417[Formula: see text]HV and 0.72 and 0.83[Formula: see text]mg in the samples sealed in boiling water and dichromate, respectively.

Study of the durability of the working body the dryer

2020 ◽  
pp. 56-60
Author(s):  
A. P. Chernysh
Keyword(s):  
Heat Treatment ◽  
Wear Resistance ◽  
Cast Iron ◽  
White Cast Iron ◽  
Low Cost ◽  
Functional Surface ◽  
Wear Coatings

In this article, the plant for heat treatment of grain material, namely perfo-rated spiral operating part, developed by the authors was chosen as the object of improving the wear resistance. The research was conducted in the laboratory of the Technology of Metals and Machinery Repair Department of Kemerovo State Agricultural Institute. The aim of the research is to select the most appropriate method of hardening the functional surface of perforated spiral operating part with the use of low-cost anti-wear coatings. The basis for choosing the method of surfacing the coating was the use of a method of forming the technological repair units (TRU), which allowed electric spark treatment with unalloyed white cast iron.

Research on Preparation and Properties of Antiwear and Anticorrosion Composite Coating Ni-P-SiC

2014 ◽  
Vol 988 ◽  
pp. 117-120
Author(s):  
Ya Min Li ◽  
Xing Zhang ◽  
Amin Wang ◽  
Hong Jun Liu
Keyword(s):  
Heat Treatment ◽  
Wear Resistance ◽  
Corrosion Resistance ◽  
Aluminum Alloy ◽  
Electroless Plating ◽  
Bonding Strength ◽  
Composite Coatings ◽  
Micro Hardness ◽  
Uniform Thickness ◽  
Structure And Morphology

Ni-P-SiC composite coatings on the surface of ZL102 aluminum alloy were prepared by direct electroless plating. The structure and morphology of the coatings after heat treatment at 400 °C for 1 hour were analyzed by XRD and SEM. The bonding strength, hardness, corrosion resistance and wear resistance of the coatings were tested. The results show that the coatings structure is crystalline and the main crystal phase is Ni3P. The SiC particles are evenly distributed in the coatings. The coatings have uniform thickness, high bonding strength and high micro hardness (up to 1395.28 HV.2). It is also shown that the substrate corrosion resistance and wear resistance can be considerably improved after electroless plating.

Effect of Laser Surface Heat Treatment on Wear and Hardness Resistance of Metal Matrix Composite from (Al- 6061+ SiC Particles)

2021 ◽  
Vol 1039 ◽  
pp. 86-95
Author(s):  
Mohammed Z. Hasan ◽  
Mahmood A. Mohammed ◽  
Isam E. Yousif
Keyword(s):  
Heat Treatment ◽  
Wear Resistance ◽  
Composite Material ◽  
Aluminum Alloy ◽  
Base Alloy ◽  
Surface Heat ◽  
Laser Surface ◽  
Al 6061 ◽  
Sic Particles ◽  
Prepared Composite

In this paper, the effect of laser surface heat treatment on wear resistance and hardness of an aluminum alloy Al-6061 as a base material with different ratios of SiC particles as an additive was studied. The composite material was prepared from Al-6061 aluminum alloy and particles with a granular size of (10-70) μm with different weight ratios (15%, 12%, 9%, 6%, 3%), where the stirred plumbing technique was used to ensure An increase in the wettability of SiC particles in the base alloy fuse and the possibility of distributing it uniformly. The laser surface heat treatment of the composite material prepared using the Neodymium - YAG laser was performed with a power of 1J, a wavelength of 1.06 μm, a pulse time of 5 m sec, and a distance of 30 cm between the exit area of the laser from the system and the piece to be thermally treated. The results showed an improvement in the mechanical properties of the prepared composite material (hardness, wear resistance) after performing the surface heat treatment by laser. The increase in the hardness amount was 12.9% when adding 15% of particles to the base alloy. The results showed that the wear rate value decreases with increasing the added percentages of SiC particles. The results also showed that the surface heat treatment of the laser led to an improvement in the wear resistance of the prepared composite material and for all the added ratios of SiC particles at different loading pressures used and in close proportions. Also, the prepared samples were photographed using a regular optical microscope before and after the laser surface heat treatment.

scholarly journals INFLUENCE OF HEAT TREATMENT ON MICROSTRUCTURAL EVOLUTION AND MECHANICAL CHARACTERISTICS OF AA6061 ALUMINUM ALLOY / TERMINIO APDOROJIMO ĮTAKA ALIUMINIO LYDINIO AA6061 MIKROSTRUKTŪRAI IR MECHANINĖMS SAVYBĖMS

2019 ◽  
Vol 11 (0) ◽  
pp. 1-5
Author(s):  
Hanae Chabba ◽  
Irmantas Gedzevičius ◽  
Valentinas Varnauskas ◽  
Driss Dafir ◽  
Fouzi Belmir
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Electrical Resistivity ◽  
Aluminum Alloy ◽  
Solution Heat Treatment ◽  
Room Temperature ◽  
Mechanical Characteristics ◽  
Micro Hardness ◽  
Treatment Conditions ◽  
Experimental Parameters

This study aims to understand the influence of heat treatment on behavior of AA6061 aluminum alloy at room temperature for various heat treatment. Two experimental parameters for this alloy are defined: micro hardness and the electrical resistivity, as a function of heat treatment at ambient temperature. The results show that the heat treatment conditions have an effective influence in mechanical properties of Al-Mg-Si aluminum alloy. This variation of the mechanical properties is the result of microstructural changes which have been observed using optical microscopy. When the material is subjected to a solution heat treatment followed by quenching and artificial aging, its mechanical properties, especially micro hardness and electrical resistivity, reach their highest levels and become very good compared to the other heat treatment applied to the same alloy.

Effect of Heat Treatment on Microstructure, Hardness and Wear of Aluminum Alloy 332

2015 ◽  
Vol 786 ◽  
pp. 18-22 ◽  
Author(s):  
Fizam Zainon ◽  
Khairel Rafezi Ahmad ◽  
Ruslizam Daud
Keyword(s):  
Heat Treatment ◽  
Wear Resistance ◽  
Aluminum Alloy ◽  
Room Temperature ◽  
Eutectic Silicon ◽  
Solution Treatment ◽  
Aging Treatment ◽  
Room Temperature Aging ◽  
Temperature Aging ◽  
Silicon Particles

This paper describes a study on the effects of heat treatment on the microstructure, hardness and wear of aluminum alloys 332 (AlSi9Cu3Mg). The solution treatment was performed at 500°C for 5 hours and then quenched in water at room temperature. Aging was performed at 170°C for 2 hours. The findings revealed that after a full heat treatment, the structure of the eutectic silicon formed toward fragmentation and spheroidization, and the silicon particles became coarse (look-like rounded). Hard intermetallic compound (Mg2Si) appeared on the microstructure after the aging treatment completed. Compared to the as-cast, the hardness of the alloys has improved to 44.84%, and the wear rate of the solution treatment had decreased to 26% while the aging treatment showed a deterioration of 79.42%. The study concludes that aging treatment improves the hardness of AA332 alloys and enhanced the wear resistance of the substance.

The Structure and Frictional Properties of Aluminum Alloy Anodic Oxide Film

2012 ◽  
Vol 538-541 ◽  
pp. 132-135
Author(s):  
Sui Yuan Chen ◽  
Yong Ze Yang ◽  
Jing Liang ◽  
Chang Sheng Liu
Keyword(s):  
Heat Treatment ◽  
Aluminum Alloy ◽  
Oxide Film ◽  
Anodic Oxide ◽  
Treatment Temperature ◽  
Wear Loss ◽  
External Diameter ◽  
2024 Aluminum Alloy ◽  
Compact Structure ◽  
Heat Treated

Anodic oxide films were prepared firstly on the surface of a 2024 aluminum alloy. Then the effect of different heat-treatment temperatures on the structure and properties of the films was studied. The results indicate that the construction units of Al2O3 oxide film were composed of tubules less than 100nm in external diameter, and the film became more compact and uniform as a result of the increased temperature after the heat treatments of 100, 150, 200, 250, 300, 350, and 400°C under the protection of a H2 atmosphere. The hardness of the films increased linearly with the increase of heat treatment temperature; whereas the wear loss tended to decrease first and then increase. After being treated at the temperature of 250°C, the hardness reaches 606HV, the wear loss is a minimum of 11mg. The structure of the film heat-treated at 250°C has a compact structure, higher hardness, and the best wear resistance.

KAISER ALUMINUM ALLOY 4026

Alloy Digest ◽  
2003 ◽  
Vol 52 (10) ◽  
Keyword(s):  
Wear Resistance ◽  
Aluminum Alloy ◽  
Physical Properties ◽  
Tensile Properties ◽  
Sliding Friction ◽  
High Strength ◽  
Heat Treating ◽  
Kaiser Aluminum ◽  
Friction Resistance

Abstract Kaiser Aluminum alloy 4026 has high strength and good wear resistance, as well as galling resistance. It was developed for sliding friction resistance. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on heat treating. Filing Code: AL-385. Producer or source: Tennalum, A Division of Kaiser Aluminum.

UNS A97075

Alloy Digest ◽  
1986 ◽  
Vol 35 (7) ◽  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Aluminum Alloy ◽  
High Strength ◽  
Heat Treating ◽  
Good Resistance ◽  
Temperature Performance ◽  
Structural Applications ◽  
Structural Parts ◽  
Very High

Abstract UNS No. A97075 is a wrought precipitation-hardenable aluminum alloy. It has excellent mechanical properties, workability and response to heat treatment and refrigeration. Its typical uses comprise aircraft structural parts and other highly stressed structural applications where very high strength and good resistance to corrosion are required. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and shear strength as well as fatigue. It also includes information on low temperature performance as well as forming, heat treating, and machining. Filing Code: Al-269. Producer or source: Various aluminum companies.

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