Use of Epoxy Fluoroplastic Coatings in Friction Pendulum Bearings

2015 ◽  
Vol 725-726 ◽  
pp. 537-542
Author(s):  
Alexander Smelov ◽  
Pavel Ivanochkin ◽  
Alexey Tselykh
Keyword(s):  
Wear Resistance ◽  
Experimental Research ◽  
Multilayer Coating ◽  
Transfer Layer ◽  
Electrospark Coating ◽  
Friction Machine ◽  
Friction Pendulum ◽  
Friction Transfer

In this paper, we consider the possibility of using, in friction pendulum bearings, multilayer friction proof coatings based on polytetrafluoroethylene compounds modified by nanoscale spinels such as magnesium, zinc and chromium. The tribological effect of applying the coating is achieved by formation of a friction transfer layer. For better wear resistance, we applied a multilayer coating with a power frame covered using electrospark coating. We performed an experimental research of bushing samples and various coating fluoroplastic bases. The research on a friction machine “SMT-1” has shown the effectiveness of epoxy fluoroplastic composition as an anti-friction coating in comparison to other types of fluoropolymer bases.

scholarly journals Wear Inducing Phase Transformation of Plasma Transfer Arc Coated Tools during Friction Stir Welding with Al Alloy

2019 ◽  
Vol 2019 ◽  
pp. 1-10 ◽  
Author(s):  
Kuan-Jen Chen ◽  
Fei-Yi Hung ◽  
Truan-Sheng Lui ◽  
Yong-Ren Shih
Keyword(s):  
Wear Resistance ◽  
Phase Transformation ◽  
Friction Stir Welding ◽  
High Speed ◽  
Phase Transfer ◽  
Welding Process ◽  
High Speed Steel ◽  
Al Alloy ◽  
Transfer Layer ◽  
Friction Stir

The friction stir welding process (friction stir welding/processing, FSW/FSP) has wear problems related to stirring tools. In this study, the plasma transfer arc (PTA) method was used with stellite 1 powders (Co-based) to coat on the head of a SKD61 stirring tool (SKD61-ST1) in order to investigate the wear performance and phase transformation of SKD61-ST1 after FSW. Under the same experimental parameters, the wear data were compared with the high-speed steel SKH51 (tempering material SKH51-T and annealed material SKH51-A) and tungsten-carbide cobalt (TCC). Results showed the PTA coating was a γ-Co solidification matrix with M7C3 and M23C6 carbides. After FSW, the wear resistance of SKD61-ST1 was better than that of SKH51-A and SKH51-T and lower than that of TCC. The SKD61-ST1, SKH51-A, and SKH51-T stirring tools exhibited sliding wear after FSP, where the pin and shoulder of the stirring tool formed a phase transfer layer on the surface, and the peeling of the phase transfer layer caused wear weight loss. The main phase of the phase transfer layer of the SKD61-ST1 tool was Al9Co2. The affinity and adhesion energy of the Co-Al phase was lower than that of Fe-Al phase, and the phase transfer layer of the SKD61-ST1 tool was thinner and had lower coverage, thereby increasing the wear resistance of the SKD61-ST1 stirring tools during FSW.

A TECHNIQUE FOR MONITORING THE INTEGRITY OF THE COATING AND DEVICE FOR ITS IMPLEMENTATION

2020 ◽  
pp. 36-41
Author(s):  
A. V. Moroz ◽  
A. M. Sipatdinov ◽  
V. E. Filimonov
Keyword(s):  
Wear Resistance ◽  
Protective Coating ◽  
High Resistance ◽  
Control Technique ◽  
Friction Machine ◽  
Signal Conductor

The developed methodology for monitoring the integrity of the protective coating is designed to control dielectric and high-resistance coatings. The control technique consists in measuring the resistance of the signal conductor located between the base of the part that is dielectric insulated from each other and the protective coating. By changing the resistance of the signal conductor, the integrity of the protective coating is judged. A friction machine that implements this technique allows testing the wear resistance of a coating according to GOST 30480–97 with simultaneous monitoring of coating integrity. The results of a joint test of a friction machine and methods during testing for wear of different coatinges are also demonstrated.

Influence of Carbide Substrate Properties on Wear Resistance of Tool with Multilayer Coating in Machining of Chromium-Based Heat-Resistant Alloy

2016 ◽  
Vol 876 ◽  
pp. 59-68
Author(s):  
Andre Batako ◽  
Anatoliy Matveevich Adaskin ◽  
Victor Nikolaevich Butrim ◽  
Alexey Anatolevich Vereschaka ◽  
Anatoliy Stepanovich Vereschaka
Keyword(s):  
Wear Resistance ◽  
Heat Resistance ◽  
Composite Coatings ◽  
Multilayer Coating ◽  
High Heat ◽  
Maximum Efficiency ◽  
Significant Deterioration ◽  
Heat Resistant Alloy ◽  
Resistant Alloy ◽  
Heat Resistant

Thispaper presents the results of the studies of the combined influence of properties of carbide substrate and composite coatings on tool wear resistance in machining of chromium-based heat-resistant alloys. It was established that the efficiency of carbide tools with coatings is determined by a combination of the properties of the carbide substrate and the coating itself. For carbides with relatively low strength and crack resistance, the efficiency of coatings appeared to be unsatisfactory because of brittle fracture of the substrate and thus intensive failure of coating. High heat resistance of cobalt-rhenium alloy is not realized during deposition of coating because of blocking of the most important property of heat-resistant Co/Re binder, i.e. the ability to hold carbide grains under significant deterioration of carbide matrix even at a high temperature in the cutting zone.The maximum efficiency of the coating in machining of chromium-based heat-resistant alloy is provided withcarbide tools made with a balanced ratio of hardness, heat resistance and strength.

Formation of Nanostructure Surface Layers from Materials with Shape Memory Effect TiNiCu in Conditions

2013 ◽  
Vol 738-739 ◽  
pp. 512-517 ◽  
Author(s):  
Peter Olegovich Rusinov ◽  
Zhesfina Michailovna Blednova
Keyword(s):  
Wear Resistance ◽  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Experimental Research ◽  
Combined Method ◽  
Surface Layers ◽  
Nanostructure Surface ◽  
Average Size ◽  
To Receive

Results of an experimental research on formation of surface layers from a material with shape memory effect (SME) three-componental structure on the basis of TiNiCu combined method including mechanical activation and a plasma dusting in vacuum are presented. It is shown, that the plasma dusting in vacuum of three-componental system TiNiCu allows to receive surface layers in nanostructure condition practically of any thickness. The structure, chemical and phase structure of blankets TiNiCu provide display SME. The average size of grain of coverings TiNiCu fluctuates within 20-200 nanometers. It is experimentally shown, that superficial modifying TiNiCu raises durability of a steel 45 at multicyclic loading on ~30-45 %, and wear resistance in 2,5 3 times.

Copper Multilayer Coating Prepared by Ultrasonic-Electrodeposition

2010 ◽  
Vol 97-101 ◽  
pp. 1348-1351 ◽  
Author(s):  
Rong Hong Cui ◽  
Zhi Ming Yu ◽  
Yu Ting He ◽  
Wen Jun Shu
Keyword(s):  
Wear Resistance ◽  
Corrosion Resistance ◽  
Stainless Steel Substrate ◽  
Steel Substrate ◽  
Multilayer Coating ◽  
Average Diameter ◽  
Nacl Solution ◽  
Anode Polarization ◽  
Hno3 Solution ◽  
Diffraction Peaks

A kind of copper multilayer coating was prepared on stainless steel substrate using ultrasonic-electrodepositing method. The microstructure, hardness, wear resistance, adhesion and corrosion resistance of it were investigated respectively. The results show that the coating exhibits a multilayer structure and the thickness of each layer is about 0.3µm. The crystallite average diameter of it is obviously smaller than that of the ordinary electrodeposited copper coating. The diffraction peaks of Cu (200) and Cu (111) for it are obviously stronger, while Cu (220) for it is much weaker. Comparative investigations on the mechanical properties show that only the hardness of it is a little lower, whereas the wear resistance and the adhesion of it to the substrate are all evidently enhanced. The average start corrosion time of it in 20％ HNO3 solution is nearly three times delayed, and the corrosion rate is obviously decreased; anode polarization curves in 3.5% NaCl solution also show that the corrosion resistance of it is greatly improved.

A novel post-processing method for 316L steel specimen generated by SLM using TiN/TiAlN multilayer coating

2020 ◽  
Vol 26 (9) ◽  
pp. 1477-1483
Author(s):  
Yueling Lyu ◽  
Yangzhi Chen ◽  
Yulin Wan
Keyword(s):  
Wear Resistance ◽  
Surface Morphology ◽  
Multilayer Coating ◽  
Processing Method ◽  
Mechanical Transmission ◽  
Micro Hardness ◽  
Post Processing ◽  
Arc Ion Plating ◽  
Content Type ◽  
Ion Plating

Purpose Selective laser melting (SLM) is an important advanced additive manufacturing technology. The existing SLM printing technology cannot manufacture the mechanical parts that fully meet the requirements of high precision and strength. This paper aims to explore a new post-processing method for SLM 316L specimen, namely, using of the TiN/TiAlN multilayer coating fabricated by multi-arc ion plating on the surface of SLM specimens, for improving the performance of SLM specimens. The other purpose of this paper is compared the performances of the TiAlN/TiN multilayer coating machined specimen and the TiN/TiAlN multilayer coating SLM specimen. Design/methodology/approach The TiN/TiAlN multilayer coating is fabricated by multi-arc ion plating on the surface of 316L specimens. The surface morphology and selected mechanical properties of TiN/TiAlN multilayer coating plating on the SLM substrate specimen and the machined substrate specimen were studied in this paper. The analyzed properties included surface topography, micro hardness, the adhesion, the thickness and the wear resistance of TiN/TiAlN multilayer coating plating on the SLM substrate specimen and the machined substrate specimen. Findings The electron microscope images reveal that surface morphology of TiN/TiAlN multilayer coating plating on the SLM specimens is relatively flat, and there are some micro-particles in different sizes and pin holes dispersed on them. After TiN/TiAlN multilayer coating, the performances of SLM samples, such as micro hardness, the thickness and the wear resistance, were significantly improved. The micro hardness of TiN/TiAlN multilayer coating machined specimen is higher than that of TiN/TiAlN multilayer coating SLM specimen. However, the adhesion of TiN/TiAlN multilayer coating machined specimen is less than that of TiN/TiAlN multilayer coating SLM specimen. Originality/value The study provides a new post-processing method for SLM 316L specimen to improve the performance of SLM specimens and to enable SLM specimens to be applied in the field of precision mechanical transmission.

scholarly journals Experimental Study on the Influence of TiN/AlTiN PVD Layer on the Surface Characteristics of Hot Work Tool Steel

2021 ◽  
Vol 11 (19) ◽  
pp. 9309
Author(s):  
Enikő Bitay ◽  
László Tóth ◽  
Tünde Anna Kovács ◽  
Zoltán Nyikes ◽  
Attila Levente Gergely
Keyword(s):  
Wear Resistance ◽  
Surface Modification ◽  
Tool Steel ◽  
Physical Vapor Deposition ◽  
Multilayer Coating ◽  
Surface Characteristics ◽  
Wear Properties ◽  
Wear Coefficient ◽  
Plasma Nitridation ◽  
Hot Work Tool Steel

It is desirable to improve tool steel wear resistance to produce pieces with precise dimensions and increase the lifetime of tools. The aim of this work was to modify the surface of 1.2344 (X40CrMoV5-1) hot work tool steel to improve the wear properties. Surface modification was achieved in three steps: first, hardening was applied, followed by plasma nitridation and, finally, physical vapor deposition (PVD) was employed to produce a TiN/AlTiN multilayer coating. The microhardness and the wear coefficient of the surfaces were measured. PVD coating showed the highest hardness value, 2938 HV0,01, whereas plasma nitridation followed by PVD resulted in 2679 HV0,01. The surface modification resulted in an increase in surface roughness in all cases compared to the hardened sample. However, the wear coefficient showed a significant decrease for the surface treated samples. The lowest wear coefficient of K = 1.47 10–10 mm3/Nm, which is a magnitude lower than the reference hardened sample (K = 6.32 10–9 mm3/Nm), was achieved employing both plasma nitridation and PVD. The results confirm that the use of a combined surface modification of plasma nitridation and PVD significantly improve the wear resistance of the treated samples.

scholarly journals Experimental Research on Microhardness and Wear Resistance of MB8 Magnesium Alloy Treated by Ultrasonic Impact

2017 ◽  
Vol 46 (7) ◽  
pp. 1798-1802 ◽  
Author(s):  
Yu Yingxia ◽  
He Bolin ◽  
Lv Zongmin ◽  
Lei Siyong ◽  
Xia Songsong
Keyword(s):  
Wear Resistance ◽  
Magnesium Alloy ◽  
Experimental Research

Surface Modification of Aluminum Alloy Using Plasma Based Ion Implantation and Deposition

2012 ◽  
Vol 488-489 ◽  
pp. 960-966 ◽  
Author(s):  
Tadahiro Wada ◽  
Jun Nakanishi ◽  
Yasuhiro Miki ◽  
Makoto Asano ◽  
Koji Iwamoto ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Surface Modification ◽  
Aluminum Alloy ◽  
Aluminum Alloys ◽  
Multilayer Coating ◽  
Frictional Coefficient ◽  
Negative Influence ◽  
Dlc Film ◽  
Mechanical Parts ◽  
Silicon Based

Aluminum alloys are used for mechanical parts, but the alloys have poor wear-resistance. To increase their wear resistance, a hard coating is applied to the surface of the alloys. Diamond-like carbon (DLC) is applied in surface modification technology due to its superior mechanical characteristics. In this study, in order to achieve effective surface modification to improve the wear resistance of the aluminum alloys, a new coatings-system was designed. This coating-substrate system is a multilayer coating-substrate system, which consists of nitriding pretreatment of the substrate, the intermediate layer of the silicon-based film and the outer layer of the DLC film. This new coating-system was used to deposit DLC film on three kinds of aluminum alloys that have different Si contents. In order to determine the influence of the Si contents on the mechanical properties of the DLC film, SEM observation of the cross section of the coating layer, the adhesion and the wear resistance of the layer were experimentally investigated. The results were as follows: (1) In the case of the DLC un-coated aluminum alloys, the rapid progress of the friction coefficient in the case of 10-N load was found at the short sliding distance. (2) The hardness of the DLC film was not decreased with the increase of Si contents. And the increase of Si contents did not have a negative influence upon the hardness of the DLC film. (3) The frictional coefficient of the Al-4%Si alloy was the smallest, the frictional coefficient of the DLC film was decreased with the increase of Si contents, and it was effective for improvement of the frictional coefficient to increase Si contents. The new coating-substrate system is effective for improving the adhesion between the substrate of the aluminum alloy and the DLC film. Moreover, the increase of Si contents was effective for the decrease in the frictional coefficient.

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