scholarly journals Performance of MoS2/Zr Composite Coatings at Different Deposition Temperatures

Materials ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 5100
Author(s):  
Wenlong Song ◽  
Kai Sun ◽  
Guangming Zhao ◽  
Long Zhu ◽  
Shoujun Wang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Deposition Temperature ◽  
Adhesion Force ◽  
Composite Coatings ◽  
Hardened Steel ◽  
Dry Sliding ◽  
Micro Hardness ◽  
Properties Of Coatings ◽  
Mechanical And Tribological Properties ◽  
Deposition Technology

The properties of the MoS2/Zr coatings can be significantly affected by the deposition temperature. In this study, the MoS2/Zr composite coatings were fabricated on the cemented carbide surface, utilizing the duplex deposition technology at various deposition temperatures. The effects of deposition temperature on the mechanical and friction properties of the MoS2/Zr coatings were systematically studied. Results exhibited that as the deposition temperature increased, the adhesion force increased first and then decreased, and the coating thickness and micro-hardness gradually increased. Dry sliding tests against a hardened steel ring showed that the tribological behaviors and wear mechanisms of the MoS2/Zr coatings varied with deposition temperature, which were due to the changing mechanical properties of coatings caused by the temperature. The coatings deposited at a temperature of 180 °C and 200 °C possessed preferable comprehensive mechanical and tribological properties.

scholarly journals Improving the microstructure and mechanical properties of laser cladded Ni-based alloy coatings by changing their composition: A review

2020 ◽  
Vol 59 (1) ◽  
pp. 340-351
Author(s):  
Lin Yinghua ◽  
Ping Xuelong ◽  
Kuang Jiacai ◽  
Deng Yingjun
Keyword(s):  
Mechanical Properties ◽  
Wear Resistance ◽  
Corrosion Resistance ◽  
Rare Earth ◽  
Composite Coatings ◽  
Single Element ◽  
Properties Of Coatings ◽  
Hard Particles ◽  
Microstructure And Mechanical Properties ◽  
Nickel Based Alloy

AbstractNi-based alloy coatings prepared by laser cladding has high bonding strength, excellent wear resistance and corrosion resistance. The mechanical properties of coatings can be further improved by changing the composition of alloy powders. This paper reviewed the improved microstructure and mechanical properties of Ni-based composite coatings by hard particles, single element and rare earth elements. The problems that need to be solved for the particle-reinforced nickel-based alloy coatings are pointed out. The prospects of the research are also discussed.

scholarly journals Application of the plasticity characteristic determined by the indentation technique for evaluation of mechanical properties of coatings: I. specific features of the test method procedure

2004 ◽  
Vol 36 (1) ◽  
pp. 27-41 ◽  
Author(s):  
A.V. Byakova ◽  
Yu.V. Milman ◽  
A.A. Vlasov
Keyword(s):  
Mechanical Properties ◽  
Indentation Load ◽  
Test Method ◽  
Simplified Model ◽  
Micro Hardness ◽  
Properties Of Coatings ◽  
Modified Model ◽  
Plasticity Characteristic ◽  
Measurement Results ◽  
Hardness Values

Specific features of the test method procedure capable for determining the plasticity characteristic dH by indentation of inhomogeneous coatings affected by residual stress was clarified. When the value of the plasticity characteristic for coating was found to be as great as dH > 0.5 a simplified model was found to be reasonably adequate, while a modified model assumed compressibility of the deformation core beneath indentation. The advantage of the modified approach compared to the simplified one was grounded experimentally only if the elastic deformation for coating becomes greater than ?e ? 3.5%, resulting in the decrease of plasticity characteristic dH < 0.5. To overcome non accuracy caused by the effect of the scale factor on measurement results a comparison of different coatings was suggested using stabilized values of the plasticity characteristic dH determined under loads higher than critical, P ? Pc, ensuring week dependence of micro hardness values on the indentation load.

scholarly journals Effect of Zr Target Current on the Mechanical and Tribological Performance of MoS2–Zr Composite Lubricating Coatings

Coatings ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 80
Author(s):  
Wenlong Song ◽  
Zixiang Xia ◽  
Shoujun Wang ◽  
Qingge Zhang
Keyword(s):  
Mechanical Properties ◽  
Composite Coatings ◽  
Adhesive Force ◽  
Tribological Performance ◽  
Micro Hardness ◽  
Radio Frequency Magnetron Sputtering ◽  
Ion Plating ◽  
Surface Morphologies ◽  
Wear Modes ◽  
Mos2 Coating

To improve the tribological properties of pure MoS2 coating, the MoS2–Zr composite lubricating coatings were prepared on the WC/TiC/Co carbide surface utilizing radio frequency magnetron sputtering method combining with multiple arc ion plating technology. The effects of different Zr target currents on the surface morphologies, roughness, Zr content, adhesive force, thickness, microhardness and tribological behaviors of the composite coatings were systematically investigated. Results showed that the properties of MoS2 coating can be remarkably enhanced through co-deposition of a certain amount of Zr. As the Zr target current increased, the Zr content, surface roughness, thickness, and micro-hardness gradually increased, while the adhesive force of coatings increased first and then decreased. The friction behaviors and wear modes of the composite coatings both varied obviously with the increase of Zr current. The mechanism was mainly attributed to the different components and mechanical properties of the coatings caused by various Zr current.

Effect of Current Density on the Composition and Mechanical Properties of Cr1-xAlxN Coating by Ion Arc Plating

2012 ◽  
Vol 557-559 ◽  
pp. 1971-1974
Author(s):  
Cheng Xi Wang ◽  
Ji Hua Peng ◽  
Xian Wen Liang ◽  
Jun Tian
Keyword(s):  
Mechanical Properties ◽  
Surface Morphology ◽  
Current Density ◽  
Adhesion Force ◽  
Atomic Ratio ◽  
Pure Metal ◽  
Metal Target ◽  
Micro Hardness ◽  
Al Content ◽  
Maximum Value

The Cr1-xAlxN coatings were deposited onto M2 tool steel using ion arc plating technique. The effect of current density on the surface morphology and mechanical properties of TiN/CrAlN coating was made. It was found that adjusting the pure metal target currents is not only to change the metal atomic ratio, but also to influence the surface morphology, their hardness and adhesion. The micro hardness Hv increases almost linearly with Al content of the coating in this study, and the Cr0.41Al0.59N coating reaches Hv 2950. The adhesion force between the coating and the substrate reaches maximum value 55N, when the [Al]/[Al+Cr] ratio is 0.44.

Effects of Al Addition on Mechanical Properties of Plasma Spayed Al2O3-Al Composite Coatings

2008 ◽  
Vol 569 ◽  
pp. 361-364
Author(s):  
Zhi Jian Yin ◽  
Shun Yan Tao ◽  
Xia Ming Zhou ◽  
Chuan Xian Ding
Keyword(s):  
Mechanical Properties ◽  
Friction Coefficient ◽  
Sliding Wear ◽  
Composite Coatings ◽  
Properties Of Coatings ◽  
Al Composite ◽  
Al Addition ◽  
Al Additions ◽  
Al Coating ◽  
Data Variation

In this work, Al2O3-Al composite coatings with different compositions (Al2O3-5wt.% Al, Al2O3-10wt.% Al and Al2O3-15wt.% Al) were deposited by plasma spraying. The effect of Al addition on the mechanical properties of coatings was explored in terms of microhardness, fracture toughness and sliding wear rate. An additional statistical study of Weibull analysis was carried out for further investigating the mechanical data variation. The increase in Al addition was realized to show little effects to decrease porosity of coatings. With the increase in Al addition, the microhardness of coatings decreased from 869 to 742 Hν0.2 along with larger fluctuation in microhardness values indicated by lower Weibull modulus (5.7-10), whereas toughness of coatings was improved ranging from 2.7 to 4.1 MPa.m1/2. Friction tests showed that the Al additions effectively contribute to decrease the friction coefficient of coatings sliding against steel counterpart. Among various coatings, the Al2O3-15wt.% Al coating exhibits lowest friction coefficient but worst wear resistance. This may arise due to its significantly decreased microhardness.

Evaluation and comparison the effect of heat treatment on mechanical properties of NiCrBSi thermally sprayed coatings

2018 ◽  
Vol 65 (1) ◽  
pp. 34-37
Author(s):  
Mohsen Shabanlo ◽  
Reza Amini Najafabadi ◽  
Amirhossein Meysami
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Wear Test ◽  
Flame Spray ◽  
Micro Hardness ◽  
Post Heat Treatment ◽  
Properties Of Coatings ◽  
Content Type ◽  
Sprayed Coatings ◽  
Thermal Sprayed Coatings

Purpose This study aims to investigate the effect of post heat treatment on mechanical properties of NiCrBSi coatings, which were applied on 316L stainless steel using high-velocity oxygen-fuel (HVOF) and flame spray techniques. Design/methodology/approach The properties of coatings were investigated by metallographic characterizations as well as wear, micro-hardness and adhesion tests. Findings The micro-hardness results showed that the coatings considerably increased the sub-layer hardness. In addition, regarding the wear test results, it can be seen that heat treatment increased wear resistance of the coatings. These thermal sprayed coatings are usually re-melted by post heat treatment, leading to improvement in tribological properties. The results obtained revealed that re-melting procedure improved the metallurgical bonding in the substrate\coating interface. Originality/value Microstructure defects resulting from thermal spraying such as pores and unmelted particles can be eliminated by post heat treatment. This process can considerably improve the corrosion and wear resistances of the thermal sprayed coatings.

Mechanical and Tribological Properties of Al2O3-ZrO2 Based Composites Prepared by EPD

2012 ◽  
Vol 507 ◽  
pp. 191-195 ◽  
Author(s):  
Pavol Hvizdoš ◽  
Viktor Puchý ◽  
Daniel Drdlík ◽  
Jaroslav Cihlář
Keyword(s):  
Mechanical Properties ◽  
Chemical Composition ◽  
Friction And Wear ◽  
Tribological Behavior ◽  
Dry Sliding ◽  
Depth Sensing ◽  
Wear Rates ◽  
Mechanical And Tribological Properties ◽  
Pin On Disc ◽  
Indentation Methods

Alumina and both tetragonal and cubic zirconia based composites with various volume fractions of constituents as well as with addition of carbon nanofibers were prepared by EPD. Mechanical properties (hardness, Youngs modulus) were measured by depth sensing indentation methods and related to chemical composition. Tribological behavior was studied using pin-on-disc technique at room temperatures in air at dry sliding. Coefficient of friction and wear rates were measured, the types of wear regimes were observed and damage micromechanisms identified.

Effects of CNT Concentration and Heat Treatment on Micro-Hardness of Ni-P-CNTs Composite Coatings

2011 ◽  
Vol 694 ◽  
pp. 855-859
Author(s):  
Wan Chang Sun
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Carbon Nanotubes ◽  
Electroless Plating ◽  
Carbon Material ◽  
Composite Coatings ◽  
Tribological Performance ◽  
Tubular Structure ◽  
Micro Hardness ◽  
Plating Bath

As a new carbon material, carbon nanotubes have excellent mechanical properties and special tubular structure, CNTs can be used as a reinforce body to improve the hardness and tribological performance. In this paper, Ni-P-CNTs composite coatings were successfully co-deposited by electroless plating. The optimum plating process was determined, and the effects of CNTs and heat treatment on hardness of the composite coatings were investigated. The hardness of the composite coatings was greatly improved after heat treatment. Moreover, as the increase of CNT concentration in the plating bath, the micro-hardness of the coatings was also increased.

Fabrication of Fe-Based Amorphous Composite Coatings by Electrothermal Explosion Spraying on Aluminum Substrate

2010 ◽  
Vol 154-155 ◽  
pp. 485-489
Author(s):  
Wei Qiang Hu ◽  
Zong De Liu ◽  
Yong Tian Wang ◽  
Hua Lei Zhang ◽  
Song Wang
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Composite Coating ◽  
Vickers Hardness ◽  
Composite Coatings ◽  
Micro Hardness ◽  
Electrothermal Explosion ◽  
Dense Structure ◽  
Hardness Tester ◽  
Different Thickness

In order to improve the surface properties of the aluminum alloy, an amorphous composite coating was prepared on the surface of the aluminum alloy substrate by electrothermal explosion spraying with fully amorphous Fe-Si-B ribbons. The microstructure, phase structure and micro-hardness of the coating were characterized by SEM, XRD and Vickers hardness tester. The results show that the composite coating is composed of amorphous phase and nanocrystal phase. The coating has dense structure and low porosity. It has not been seen rough laminar microstructure that is frequently obtained by other thermal spray techniques. The amorphous composite coatings with different thickness present higher hardness and show good mechanical properties.

Theoretical Analysis of Chroming Electrolytes and Properties of Chrome Coatings

2020 ◽  
Vol 836 ◽  
pp. 142-150
Author(s):  
Yu.A. Stekolnikov ◽  
S.D. Polischuk ◽  
D.G. Churilov ◽  
N.V. Byshov ◽  
S.N. Borychev ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Chemical Composition ◽  
Deposition Rate ◽  
Transition Time ◽  
Internal Stresses ◽  
High Deposition Rate ◽  
Micro Hardness ◽  
Properties Of Coatings ◽  
Current Output ◽  
Low Concentration

According to the dynamic characteristics of the electrochemical system, according to V.F. Molchanov, it is possible to optimize the composition of chroming electrolyte and predict the properties of chromium deposits depending on the mode of deposition and the transition time. The possibility of using the transition time for the formation of the cathode surface colloid-dispersion film to study the chemical composition of the chroming solution is considered. The chemical composition can be optimized by the position of the maxima and minima on the polarization curves. An electrochemical cell can be described as a system by a differential equation, the form of which is determined by its internal structure, which varies with electrolysis conditions. The properties of the system are evaluated by a number of factors: the time of the transition process, forcing, attenuation, and the quality factor. This approach is used to develop a low-concentration chroming electrolyte with organic additives. Analytical dependences of chromium yield on current, micro hardness, roughness and deposition rate on deposition conditions are obtained. Chroming on non-stationary modes allows the most effective influence on the structure and physical-mechanical properties of coatings. When changing electrolysis parameters, it is possible to influence the structure and physical-mechanical properties of coatings, to obtain various functional chromium coatings with specified characteristics (adjustable micro hardness in thickness, porosity, internal stresses, corrosion resistance, wear resistance, roughness) from a single electrolyte. The use of a low-concentration electrolyte together with non-stationary deposition modes makes possible to increase the chromium current yield, covering and dissipative ability of the electrolyte, deposition rate, producibility and environmental friendliness of the process, and to reduce hydrogenation. The electrolyte with crystal violet additives has an increased current output (up to 28 %), an extended range of obtaining wear-resistant coatings up to 240 A / dm2, a high deposition rate of up to 2.5 μm / min, an increased micro hardness by 100-300 kg / mm2, reduced toxicity, a decreased absorbed hydrogen level at 500-700 cm3 per 100 grams of chrome coating and internal stresses at 600-950 kg / mm2.

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