Wear resistance of coating materials under the frictional heating conditions

2017 ◽  
Vol 38 (4) ◽  
pp. 265-271 ◽  
Author(s):  
V. B. Zelentsov ◽  
B. I. Mitrin ◽  
I. A. Lubyagin
Keyword(s):  
Wear Resistance ◽  
Frictional Heating ◽  
Coating Materials

Enlarging the Temperature Range for Maximum Wear Resistance of TiNi Alloy Using a NTE Phase

2007 ◽  
Vol 539-543 ◽  
pp. 3261-3266 ◽  
Author(s):  
Iulian Radu ◽  
Dong Yang Li
Keyword(s):  
Wear Resistance ◽  
Thermal Expansion ◽  
Internal Stress ◽  
Frictional Heating ◽  
Negative Thermal Expansion ◽  
High Wear Resistance ◽  
Tini Alloy ◽  
Wear Loss ◽  
Second Phase ◽  
Temperature Range

The near-equiatomic TiNi alloy has been demonstrated to possess high wear resistance, which largely benefits from its pseudoelasticity (PE). However, the PE occurs only in a small temperature range, which makes the wear resistance of this alloy unstable as temperature changes, caused by environmental instability or frictional heating. Therefore, enlarging the working temperature of PE could considerably improve this alloy as a novel wear-resistant material. One possible approach is to develop a self-built temperature-dependent internal stress field by taking the advance of the difference in thermal expansion between the pseudoelastic matrix and a reinforcing phase. Such a T-dependent internal stress could adjust the martensitic transformation temperature to respond changes in environmental temperature so that the temperature range of PE could be enlarged, thus leading to a wide temperature range in which the minimum wear loss is retained. Research was conducted to investigate effects of an added second phase having a negative thermal expansion (NTE) coefficient on the wear resistance of a near-equiatomic TiNi alloy. It was demonstrated that the temperature range of this modified material in which the wear loss dropped was enlarged. In addition, the wear resistance of such a TiNi-matrix composite was on one order of magnitude higher than that of unmodified TiNi alloy.

scholarly journals Characterization of graphene-filled fluoropolymer coatings for condensing heat exchangers

2021 ◽  
pp. 002199832110370
Author(s):  
Mitchell Cierpisz ◽  
Joselyne McPhedran ◽  
Youliang He ◽  
Afsaneh Edrisy
Keyword(s):  
Thermal Conductivity ◽  
Wear Resistance ◽  
Heat Exchange ◽  
Heat Exchangers ◽  
Wear Properties ◽  
Coating Materials ◽  
Chemical Attack ◽  
Minimal Improvement ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Condensing heat exchangers are thermal devices subjected to extremely corrosive environments due to the formation of acidic condensates on the heat-exchange elements during service. To protect the heat exchangers from chemical attack, perfluoroalkoxy (PFA) coating has been applied as a barrier layer onto the surfaces of the heat-exchange elements to prevent corrosion. However, PFA has intrinsically poor thermal conductivity, and low wear resistance; thus, it is not naturally a good material for heat exchanger application. In this study, graphene nanoplatelets (GNPs) are incorporated into PFA powder as coating materials to improve the thermal properties of the fluoropolymer, for condensing heat exchangers application. Two grades of GNPs (8 nm and 60 nm layer thickness) are tested to evaluate the effect of graphene addition on the thermal, adhesion, electrical, and wear properties of the composites, which are compared to those mixed with multi-walled carbon nanotubes (MWCNTs). The results showed that both grades of GNPs significantly increased the thermal conductivity, i.e., ∼8× that of the virgin PFA. The composites incorporated with both grades of GNPs also demonstrated good coating adhesion strength and wear resistance, as well as excellent corrosion resistance. The composite filled with MWCNTs exhibited poor surface finish and minimal improvement in thermal performance.

Experimental Study on Abrasion and Cavitation Resistance of Non-Metallic Coating Materials for Pump

2019 ◽  
Author(s):  
Hou-lin Liu ◽  
Man-hui Cao ◽  
Jie Chen ◽  
Yong Wang ◽  
Cheng-bin Wang
Keyword(s):  
Wear Resistance ◽  
Epoxy Resin ◽  
Abrasion Resistance ◽  
Cavitation Erosion ◽  
Erosion Resistance ◽  
Composite Resin ◽  
Metallic Coating ◽  
Test Time ◽  
Coating Materials ◽  
Cavitation Erosion Resistance

Abstract The protection of the flow-passage components of pump by using coating is an important method to increase wear resistance. This paper aims at examining abrasion resistance and cavitation erosion resistance of three typical non-metallic coating materials for pump including epoxy resin mortar, composite resin mortar and polyurethane. A wear-resistance test bench was built, using ultrasonic vibrating air eroding machine. Meanwhile, the main relative raw materials and formulas were introduced. The results indicate that: (1) The accumulated volume reduction of abrasion of composite resin mortar changes in an oblique waveform, and its abrasion resistance is better than that of epoxy resin mortar in a short period of time. The wear rate of epoxy resin mortar and composite resin mortar is higher than that of polyurethane. The total wear volume of epoxy resin mortar, composite resin mortar and polyurethane is decreased by 8.74%, 9.89% and 0.58% respectively within 30h of anti-wear test time; (2) The accumulated volume reduction of cavitation erosion of epoxy resin mortar is proportional to the time. In anti-cavitation erosion test time of 26 h, the erosion volume of composite resin mortar, polyurethane and epoxy resin mortar cavitation is reduced by 0.44%, 0.29% and 0.35%, respectively. It shows that cavitation erosion resistance of three coating materials is similar, while polyurethane materials have the best abrasion resistance.

Wear of Electric Contact Surfaces

2007 ◽  
Author(s):  
J. Song
Keyword(s):  
Wear Resistance ◽  
Precious Metals ◽  
Electrical Contacts ◽  
Fretting Corrosion ◽  
Coating Materials ◽  
Long Term Stability ◽  
Electric Contacts ◽  
Contact Surfaces ◽  
Contact Shape

Fretting corrosion is one of the important factors which limits the lifetime of electric contacts. In order to avoid fretting corrosion coatings of different precious metals are used. The wear resistance of the coating determines the lifetime of electrical contacts. The long term characteristics of gold coated electrical contacts with different additives and contact shapes are investigated and the results are analyzed. It is found out that the wear resistance of contact coating can be largely influenced by the amount of the additive in gold and by the design of the contact shape. Only the combination of an optimized contact shape with suitable coating materials leads to a long term stability of electric contacts.

Wear resistance of HVOF sprayed NiSiCrFeB, WC-Co/NiSiCrFeB, WC-Co, and WC-Cr3C2-Ni rice harvesting blades

2021 ◽  
Vol 63 (1) ◽  
pp. 62-72
Author(s):  
Ronnarit Khuengpukheiw ◽  
Charnnarong Saikaew ◽  
Anurat Wisitsoraat
Keyword(s):  
Surface Roughness ◽  
Wear Resistance ◽  
Field Tests ◽  
High Velocity Oxygen Fuel ◽  
Volume Loss ◽  
Coating Materials ◽  
Comparative Performance ◽  
Hvof Process ◽  
Comparison Approach ◽  
Oxygen Fuel

Abstract In this work, NiSiCrFeB, WC-Co/NiSiCrFeB, WC-Co, and WC-Cr3C2-Ni coatings were sprayed on rice harvesting blade surfaces using a high velocity oxygen fuel (HVOF) process. Each of the rice harvesting blades was sprayed with one of four coating materials using different spraying durations. The effects of coating materials and spraying durations on the average values of coated blade volume loss, hardness and surface roughness (Ra) were studied through real rice-harvesting field tests. Analysis of variance (ANOVA) and a multiple comparison approach with Tukey’s test were used in order to conduct a comparative performance analysis of the coating materials of rice harvesting blades. The experimental results indicated that the NiSiCrFeB coating exhibited the highest volume loss compared with all others. In addition, the WC-Co-coated blade had significantly greater hardness than those coated with NiSiCrFeB, WC-Co/NiSiCrFeB, or WC-Cr3C2-Ni. The rice harvesting blade coated with either WC-Co/NiSiCrFeB, WC-Co, or WC-Cr3C2-Ni using the shortest spraying duration was recommended for installation in rice harvesting machines.

Comparative Study of High-Chromium Cast Iron Coatings Modified with WС-W2C/Co+B4С+Ni/Al Complexes and Cr3C2/PG-US25 Ceramet

2020 ◽  
Vol 299 ◽  
pp. 818-826
Author(s):  
Alexander V. Shchegolev ◽  
Alexey V. Ishkov ◽  
Victor V. Ivanayskiy
Keyword(s):  
Wear Resistance ◽  
Cast Iron ◽  
High Performance ◽  
Base Material ◽  
Resistance Testing ◽  
Coating Materials ◽  
High Chromium ◽  
High Chromium Cast Iron ◽  
Working Bodies ◽  
Chromium Cast Iron

The article describes the preparation and comparative wear resistance testing Fe-Cr-C- (B) coating materials, intended to harden the working bodies of agricultural machines, using high-performance method of inductive surfacing, and contains the results of microstructure analysis of such coatings. These coatings are made of powder compositions, based on PG-US25 high-chromium cast iron, and borate flux for inductive surfacing of P-0.66 grade, modified with W, B, Cr carbides in amounts from 2...5 to 25...30 wt.%, which can be applied to machine’s elements without significant technology changes. Modifying agents were commercial products (WC-W2C / Co spherical cast tungsten carbide, B4C abraser). The article demonstrates that the injection of these complexes into the fusion mixture for inductive surfacing can increase their hardness (up to 1000...1200 HV100) and wear resistance of the surfacing metal 3.1...4.5 times, compared to the base metal (65G steel), and 1.3...1.8 times, compared to the base material. The observed changes in coatings characteristics are explained by Charpy effect, dispersion hardening and the formation of new phases in the coatings (boride eutectics).

Experimental Investigation of High Temperature Wear Resistant Coatings for Industrial Gas Turbine

2003 ◽  
Author(s):  
Hideyuki Matsuoka ◽  
Nobuo Shinohara ◽  
Yuji Sugita ◽  
Kunihiro Ichikawa ◽  
Hideyuki Arikawa ◽  
...  
Keyword(s):  
Wear Resistance ◽  
High Temperature ◽  
Gas Turbine ◽  
Vapor Deposition ◽  
Gas Turbines ◽  
Physical Vapor Deposition ◽  
Coating Materials ◽  
Severe Wear ◽  
High Temperature Wear ◽  
Industrial Gas Turbine

In the contact section of industrial gas turbine parts, wear can be observed after normal operations. Especially, in the contact area of combustors and their fittings, such as a transition piece and a seal plate, the severe wear may occur owing to combustion vibration under high temperature. If such severe wear occurs, some inspections or repair of the combustor parts may be needed. The short cycle of inspection and repair will decrease the performance of the gas turbine. Though combustors and their fittings are subjected to high temperature condition without any lubricant, any relevant prevention has not been developed yet. In this paper, wear resistance of ceramic hard coating materials, i.e. titanium nitride (TiN), titanium aluminum nitride (TiaAIN), chromium nitride (CrN), titanium carbide (TiC), silicon carbide (SiC), aluminum oxide (Al2O3) against various metals was tested under the condition similar to that in a gas turbines. These coatings were deposited by physical vapor deposition (PVD) or chemical vapor deposition (CVD) processes. It was concluded that, the combination of Al2O3 coating and stellite #6B had excellent high temperature wear resistance.

Determination of Abrasive Wear Resistance of Plasma Sprayed Coatings on Stainless Steel Substrate

2015 ◽  
Vol 766-767 ◽  
pp. 579-584 ◽  
Author(s):  
A. Anderson
Keyword(s):  
Stainless Steel ◽  
Wear Resistance ◽  
Abrasive Wear ◽  
Steel Substrate ◽  
Ceramic Coatings ◽  
Atmospheric Plasma ◽  
Wear Behaviour ◽  
Coating Materials ◽  
Plasma Sprayed Coatings ◽  
Plasma Sprayed

A relative study among various types of coating materials to develop wear resistance of stainless steel has been performed. Ceramic coatings with the thickness up to 250 μm were prepared by Atmospheric plasma spray technique on the stainless steel. Two different types of coating materials such that Yttria Stabilised Zirconia, Zirconia Ceria powder were used. The influence of Ceria powder on abrasive wear was determined. It was found that the addition of Ceria to Yttria Stabilised Zirconia in a sufficient amount helped in increasing its wear resistance compared to the wear behaviour of pure Yttria Stabilised Zirconia powder. Moreover, it was found that the lesser the surface roughness of the coating layer,.

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