scholarly journals Al2O3 + Graphene Low-Friction Composite Coatings Prepared By Sol–Gel Method

Coatings ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 858
Author(s):  
Bożena Pietrzyk ◽  
Sebastian Miszczak ◽  
Ye Sun ◽  
Marcin Szymański
Keyword(s):  
Tribological Properties ◽  
Composite Coatings ◽  
Sol Gel ◽  
Ceramic Coatings ◽  
Treatment Temperature ◽  
Graphene Nanoplatelets ◽  
Low Friction ◽  
Gel Method ◽  
Sol Gel Method ◽  
Graphene Composite

In this work, Al2O3 + graphene coatings were prepared using the sol–gel method. The aim of the study was preliminary determination of the influence of size and amount of graphene nanoplatelets on morphology, chemical structure, and basic tribological properties of Al2O3 + graphene composite coatings. Two types of reduced graphene oxide (rGO) nanoplatelets with different lateral size and thickness were used to prepare the coatings. To characterize them, scanning electron microscope (SEM), glow discharged optical emission spectrometer (GDOES), Fourier-transform infrared (FTIR), reflectance spectrometer, and ball-on-disk tribological tests were used. It was found that the presence of graphene in the Al2O3 + graphene coatings did not fundamentally change the chemical transformation of ceramic Al2O3 matrix. Morphology examinations of coatings containing larger graphene nanoplatelets revealed a tendency to their parallel arrangement in relation to the coated surface. The tribological properties of Al2O3 + graphene coatings turned out to be strongly dependent on the size of graphene nanoplatelets as well as on the heat treatment temperature. The friction coefficient as low as 0.11 and good durability were obtained for the Al2O3 + graphene coating with larger nanoplatelets and heat-treated at 500 °C. The results of conducted research indicate the potential use of Al2O3 + graphene composite coatings prepared by the sol–gel method as low-friction ceramic coatings.

Preparation of Y2O3-Al2O3-ZrO2 Nano-Ceramic Coatings on Metal Substrate by Sol-Gel Method

2010 ◽  
Vol 105-106 ◽  
pp. 459-462
Author(s):  
Xi Feng Hou ◽  
Peng Peng ◽  
Yan Gai Liu ◽  
Ming Hao Fang ◽  
Zhao Hui Huang
Keyword(s):  
316L Stainless Steel ◽  
Raw Materials ◽  
Steel Substrate ◽  
Sol Gel ◽  
Ceramic Coatings ◽  
Metal Substrate ◽  
Treatment Temperature ◽  
Gel Method ◽  
Sol Gel Method ◽  
Increasing Temperature

In this paper, Y2O3-Al2O3-ZrO2 nano-ceramic coatings were prepared on 316L stainless steel substrate at 600°C for 0.5 hour by sol-gel method, using Y(NO3)3•6H2O, ZrO(NO3)•2H2O and Al(NO3)3•9H2O as raw materials, hexamethylenetetramine as catalyst. Phases and morphology of these coatings were characterized by XRD, SEM and EDS. Effect of heat treatment temperature on microstructure of the coatings was studied. Y2O3-Al2O3-ZrO2 coatings with grain size about 50nm tightly integrated with metal substrate after densely sintering at 600°C. The grain sizes have grown up with increasing temperature.

Preparation of Thin Composite Coatings by Sol-Gel Techniques

1984 ◽  
Vol 32 ◽  
Author(s):  
J. Martinsen ◽  
R. A. Figat ◽  
M. W. Shafer
Keyword(s):  
Silicon Dioxide ◽  
Materials Science ◽  
Protective Coatings ◽  
Composite Coatings ◽  
Sol Gel ◽  
Ceramic Coatings ◽  
Gel Method ◽  
Sol Gel Method ◽  
Glass Compositions

The formation and characterization of thin ceramic coatings is currently an active area in materials science. Specifically, there has been increased interest in these materials as dielectric and optical layers for advanced microelectronic circuitry [1]. This is in addition to their continued use and evaluation as protective coatings in a variety of applications [2]. One method of forming these coatings is via the sol-gel technique. However, only a few papers have been published in this area [3–7]. Dense silicon dioxide, aluminium oxide and various glass compositions have been deposited in thin film form on various substrates. Further, silicon dioxide films, formed by the sol-gel method, have been nitrided in ammonia at high temperatures and partially converted to an oxynitride [8–11]. These films were shown to be highly non-homogeneous, with a predominance of nitrogen at the surface. Despite the desirability of dense uniform well bonded coatings of the nitrided ceramics, i.e. Si3N4 and the oxynitrides, no method yet exists for the formation of nitrides by the sol-gel method.

Preparation of La0.75Sr0.25Cr0.5Mn0.5O3-δ Nanometer Powders by Sol-Gel Method and Research about its Electrochemical Performance

2013 ◽  
Vol 712-715 ◽  
pp. 257-261
Author(s):  
Yin Lin Wu ◽  
Qing Hui Wang ◽  
Ling Wang ◽  
Hai Yan Zhao
Keyword(s):  
Heat Treatment ◽  
Particle Size ◽  
Electrochemical Performance ◽  
Heat Treatment Temperature ◽  
Sol Gel ◽  
Treatment Temperature ◽  
Preparation Process ◽  
Gel Method ◽  
Sol Gel Method ◽  
Ft Ir

The La0.75Sr0.25Cr0.5Mn0.5O3-δnanometer powders were prepared by citric acid sol-gel method.The samples were characterized by DTA, FT-IR, XRD, TEM techniques. The preparation process, morphology of synthesized powders, the best heat-treatment temperature and the electrochemical performance had been studied. The results show that the spherical nanometer powders can be obtained and the best heat-treatment temperature is 800°C. The particle size is about 30nm and Ea is 0.071 eV.

Mechanical and Tribological Properties of the Oxide Thin Films Obtained by Sol-Gel Method

2018 ◽  
pp. 1513-1526
Author(s):  
Carolina J. Diliegros-Godines ◽  
Francisco Javier Flores-Ruiz ◽  
Rebeca Castanedo-Pérez ◽  
Gerardo Torres-Delgado ◽  
Esteban Broitman
Keyword(s):  
Thin Films ◽  
Tribological Properties ◽  
Sol Gel ◽  
Oxide Thin Films ◽  
Gel Method ◽  
Sol Gel Method ◽  
Mechanical And Tribological Properties

Studying on Preparation of AZO Thin Films with Sol-Gel Method

2010 ◽  
Vol 152-153 ◽  
pp. 868-873 ◽  
Author(s):  
Xiu Ling Lv ◽  
Yu Bo Dou ◽  
Juan Wang ◽  
Ying Xu
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Sol Gel ◽  
Treatment Temperature ◽  
Zno Films ◽  
Gel Method ◽  
Sol Gel Method ◽  
Crystallization Properties ◽  
Doped Zno ◽  
Micro Morphology

Al doped ZnO thin films（AZO films） was prepared by sol-gel method. The influence of Parameters of different processes on the crystallization properties, micro-morphology and optical properties of this kind of films were studied, using by X-ray diffractometer, filed emission stereoscan, spectral photometer, hall admeasuring apparatus. The results indicated that the crystallization properties, micro-morphology and optical properties of Al doped ZnO films were best on the condition that the sol density was 0.5mol/L, hat treatment temperature is 600 and there is a 8-layer coating.

Low friction nanocomposite aluminum oxide/MoS2 coatings prepared by sol-gel method

2018 ◽  
Vol 44 (7) ◽  
pp. 8534-8539 ◽  
Author(s):  
Bożena Pietrzyk ◽  
Sebastian Miszczak ◽  
Łukasz Kaczmarek ◽  
Marek Klich
Keyword(s):  
Aluminum Oxide ◽  
Sol Gel ◽  
Low Friction ◽  
Gel Method ◽  
Sol Gel Method

Optimization of Experimental Parameters to the Formation of Bi2212 Phase via Sol-Gel Method

2011 ◽  
Vol 328-330 ◽  
pp. 1499-1502
Author(s):  
Hua Zhe Yang ◽  
Ye Song He ◽  
Yang Ji ◽  
Zi Mu Li ◽  
Hao Zhu
Keyword(s):  
Sol Gel ◽  
Precursor Solution ◽  
Chelating Agent ◽  
Solution Concentration ◽  
Treatment Temperature ◽  
Gel Method ◽  
Sol Gel Method ◽  
Metal Nitrates ◽  
Water As Solvent ◽  
Experimental Parameters

Bi-2212 superconducting phase was synthesized via sol-gel method, and the experimental parameters such as the concentration of precursor solution and heat treatment temperature were adjusted to find the optimal conditions. Metal nitrates were adopted as the starting materials and ethylenediaminetetracetic acid (EDTA) as chelating agent. Precursor solutions and gel with different concentration were obtained through the addition of different content of distilled water as solvent followed by heating at certain temperature to form grey powders. Afterwards, the powders were sintered at different temperature for 10 hours, respectively. X-ray diffraction (XRD) was adopted to investigate the phase purity and crystallinity of the sample derived. Results reveal that the optimized precursor solution concentration is 27% and the optimized sintering temperature is 850°C.

Preparation and Characterization of Water-Base Transparent Flame-Retardant Ceramic Coatings for Wood via Sol-Gel Method

2012 ◽  
Vol 482-484 ◽  
pp. 1085-1088 ◽  
Author(s):  
Jia Lin Liu ◽  
Chao Sheng Wang ◽  
Zheng Lin Jiang ◽  
Qiong Wang ◽  
Li Feng Li
Keyword(s):  
Flame Retardant ◽  
Sol Gel ◽  
Chemical Properties ◽  
Weight Ratio ◽  
Fire Retardant ◽  
Ceramic Coatings ◽  
Gel Method ◽  
Sol Gel Method ◽  
The Matrix ◽  
Fire Endurance

Transparent flame-retardant ceramic coatings were prepared via sol-gel method by siloxane and silica sol as the matrix, organophosphates (M102B) as the fire retardant agent, solvent and other additives. Results showed that such coatings had excellent physical and chemical properties. When the weight ratio of M102B reached 3% in the coatings and the cover weight reached 2g/100cm2 on the wood, the limit time of fire-endurance could get to 64 min. The decompose processes and formation of the flame-retardant coatings were investigated by TGA and FTIR.

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