Structure and Properties of Coatings Deposited by High Velocity Arc Spray Technique

1999 ◽  
Vol 122 (3) ◽  
pp. 646-649 ◽  
Author(s):  
Binshi Xu ◽  
Wei Zhang ◽  
Shining Ma ◽  
Baohong Tian ◽  
Xiubing Liang
Keyword(s):  
High Velocity ◽  
Test Results ◽  
Structure And Properties ◽  
Wear Properties ◽  
Properties Of Coatings ◽  
Spray Coatings ◽  
Arc Spray ◽  
Spray Technique ◽  
The Difference ◽  
Sprayed Coatings

The microstructure of spray coatings using a newly developed thermal spray technique, High Velocity Arc Spray (HVAS), was studied and compared with those of regular arc sprayed coatings. The mechanical and wear properties of HVAS coatings were also investigated. The test results showed that HVAS coatings had better mechanical properties than those of regular arc sprayed coatings. The bonding strength of HVAS Al and 3Cr13 coatings was increased by 114 percent and 51.8 percent; the relative wear resistance of HVAS coatings was about twice that of regular arc sprayed coatings. The difference of microstructure and tribological properties between HVAS and regular arc sprayed coatings was discussed. [S0742-4787(00)00203-4]

scholarly journals THE RESEARCH OF TECHNOLOGICAL PROPERTIES OF COATINGS SPRAYED WITH ELECTRIC ARC SPRAY / ELEKTROLANKINIO PURŠKIMO BŪDU UŽPURKŠTŲ DANGŲ TECHNOLOGINIŲ SAVYBIŲ TYRIMAI

2013 ◽  
Vol 5 (6) ◽  
pp. 620-624
Author(s):  
Justinas Gargasas ◽  
Algirdas Valiulis ◽  
Irmantas Gedzevičius ◽  
Šarūnas Mikaliūnas
Keyword(s):  
Mass Loss ◽  
Dry Friction ◽  
Electric Arc ◽  
Test Results ◽  
Technological Properties ◽  
Friction Test ◽  
Technological Parameters ◽  
Properties Of Coatings ◽  
Spray Coatings ◽  
Arc Spray

The paper presents dry friction test results of two experimentalSTEIN-MESYFIL wires with different chemical composition.Thermal spray coatings properties depend on the chemical compositionand the technological parameters of the spraying. Eachcoating was sprayed in the three different modes. The microhardness,porosity, oxides were analyzed in the coatings morphology.Dry friction wear was assessed in the mass loss of the coatings. Santrauka Straipsnyje pateikiami elektrolankinio purškimo būdu užpurkštų dviejų skirtingos cheminės sudėties eksperimentinių Stein-mesyfil vielų sausosios trinties tyrimų rezultatai. Terminio purškimo būdu gautų dangų savybės priklauso ne tik nuo cheminės sudėties, bet ir nuo technologinių purškimo parametrų. Kiekviena danga užpurkšta trimis skirtingais režimais. Nustatytas dangų mikrokietumas, porėtumas, oksidų kiekis ir nagrinėta dangų morfologija. Sausosios trinties dilimo rezultatai vertinti nustatant prarastąją bandinių masę.

Wear Properties of WC/Co Coatings with Plasma and High Velocity Oxyfuel Spraying

1998 ◽  
Author(s):  
T. Akasawa ◽  
K. Ai
Keyword(s):  
High Velocity ◽  
Material Removal ◽  
Sliding Wear ◽  
Substrate Surface ◽  
Wear Properties ◽  
Hvof Spraying ◽  
Plasma Sprayed Coatings ◽  
Plasma Sprayed ◽  
Steel Substrates ◽  
Sprayed Coatings

Abstract A tungsten carbide/cobalt hard coating was deposited on steel substrates using plasma-arc and high velocity oxyfuel flame (HVOF) spraying. The characteristics of the coatings made by the two spraying methods were evaluated under identical conditions. The microstructure and the chemical composition ofthe coatings were different depending on the powderheating temperature and the velocity of particles. The sliding wear properties of the coatings against hardened steel at high sliding speeds showed different tendencies from those at low speeds. The plasma sprayed coatings resulted in better abrasive wear properties than HVOF coatings did. Material removal by solid particle erosion depended on the striking angle ofparticles on the substrate surface but there are no clear differences in wear properties between the two coatings.

Research on Corrosion-Resistance of High Velocity Arc Spray Coatings on Surface of Steel Structure in Splash Zone Environment

2011 ◽  
Vol 675-677 ◽  
pp. 1291-1294 ◽  
Author(s):  
Shi Cheng Wei ◽  
Bin Shi Xu ◽  
Xiu Bing Liang ◽  
Yu Jiang Wang ◽  
Yi Liu
Keyword(s):  
High Velocity ◽  
Steel Structure ◽  
Steel Structures ◽  
Arc Spraying ◽  
Splash Zone ◽  
Factors Affecting ◽  
Spray Coatings ◽  
Arc Spray ◽  
Before And After ◽  
Corrosion Behaviors

The most severe corrosion of offshore steel structure occurs in splash zone. There are many factors affecting the steel structure corrosion in the splash zone, such as corrosion problems caused by seawater and effect of impacted brought by the ocean wave. Considering the corrosion characteristics in splash zone and the corrosion invalidity behaviors of offshore steel structure, the Zn-15Al, Al-RE, Zn-Al-Mg-RE and FeBSiNb uncrystal coatings were prepared by automatic high velocity arc spraying. The different anti-corrosion behaviors of the four coatings were studied through the corrosion comparative tests and the microstructures analyzed of the coatings before and after the corrosion tests. The anti-corrosion coating systems suitable for using on surface of steel structure corrosion in the splash zone were found, which provided technique guarantee for extending the using life of offshore steel structures.

Arc Sprayed Coatings of Ferroalloy-Base Flux-Cored Wires

2000 ◽  
Author(s):  
A.L. Borisova ◽  
I.V. Mitz ◽  
A. Kleyman
Keyword(s):  
Abrasive Wear Resistance ◽  
Structure And Properties ◽  
Properties Of Coatings ◽  
Cored Wire ◽  
Powder Charge ◽  
Substrate Adhesion ◽  
Coating Layers ◽  
Cored Wires ◽  
Sprayed Coatings ◽  
Outer Coating

Abstract This paper presents the results an experimental study on ferroalloy-base flux-cored wire coatings. The work conducted shows that it is possible to improve the structure and properties of coatings by adding aluminum to the ferrochromium powder charge and rare-earth elements and calcium to ferroboron. This reduces the oxygen content and porosity of coatings by a factor of 1.5-2. It also reduces residual tensile stresses in outer coating layers and improves coating-substrate adhesion strength as well as abrasive wear resistance.

High Velocity Wire Flame Spraying (HVWFS) of Molybdenum

2000 ◽  
Author(s):  
Fr.-W. Bach ◽  
T. Copitzky ◽  
Z. Babiak ◽  
T. Duda
Keyword(s):  
High Velocity ◽  
Flame Spraying ◽  
Wear Properties ◽  
Spray System ◽  
High Particle ◽  
Lower Porosity ◽  
Hardening Mechanisms ◽  
Particle Velocities ◽  
Wear Resistance Coatings ◽  
Sprayed Coatings

Abstract Wire flame sprayed molybdenum is a wide used procedure for manufacturing of wear resistance coatings. The properties of thermal sprayed coatings depend mainly on the kinetic and thermal energy of sprayed particles, i.e., a higher particle velocity causes an increase of coating quality. The now available high velocity spray system from Praxair which is used within this work is capable to realise the aim of high particle velocities. The coating properties presented in this work are analysed in comparison to conventional wire and powder plasma spray processes. HVWFS molybdenum coatings show lower porosity, higher adhesion and cohesion and better wear properties. To explain the results, particle size distribution, oxygen/carbon content and structure are analysed. Hardening mechanisms of coatings and their adhesion/cohesion properties are discussed based on light microscopy, SEM, XRD and TEM investigations.

Elevated Temperature Erosion Resistance of Several Experimental Amorphous Thermal Spray Coatings

1998 ◽  
Author(s):  
B. Wang
Keyword(s):  
Elevated Temperature ◽  
Thermal Spray ◽  
Erosion Resistance ◽  
Thermal Spray Coatings ◽  
Test Results ◽  
Hvof Coating ◽  
Spray Coatings ◽  
Erosion Test ◽  
Sprayed Coatings ◽  
Better Than

Abstract The elevated temperature erosion resistance of experimental amorphous thermal spray coatings was determined in a laboratory elevated temperature erosion tester. Test conditions attempted to simulate the erosion conditions found at the combustor waterwall tubes in fossil fuel fired boilers. Erosion tests were conducted on four experimental amorphous thermal spray coatings, using the bed ash retrieved from an operating coal fired boiler. An experimental arcspray process was used to spray coatings. These results were compared with erosion test results of two common structural materials, two commercially available arc-sprayed coatings, and a proprietary HVOF coating. Test results indicated that the Duocor coating had the highest erosion resistance among the four experimental coatings, it showed equal resistance to the HVOF coating (DS-200). Compared to AISI 1018 steel, both Duocor and DS-200 coatings reduced material wastage by 26-fold. Other test results indicated that the XJ-16, 60T and Armacor M coatings had equal erosion resistance reducing material wastage approximately 7-fold, while Arrnacor CW reduced by IO-fold. Only slightly better than the unprotected 1018 steel, the X-20 coating performed poorly on erosion tests. The high erosion resistance of Duocor and DS-200 coatings was attributed to their high densities and fine splat structures.

Investigating formation, structure and properties of coatings based on Cu–Ti alloys

2019 ◽  
pp. 175-181
Author(s):  
A. I. Kovtunov ◽  
T. V. Semistenova ◽  
A. M. Ostryanko
Keyword(s):  
Wear Resistance ◽  
Heat Resistance ◽  
Chemical Compound ◽  
Wear Resistant Coating ◽  
Titanium Coating ◽  
Structure And Properties ◽  
Properties Of Coatings ◽  
Wear Resistant ◽  
Ti Alloys ◽  
Titanium Wire

The paper offers technology of argon-arc surfacing with titanium wire in order to form heat and wear resistant coating based on the titanium cuprides. The influence of surfacing modes on the chemical compound and structure of formed coatings is determined. The wear resistance and heat resistance at 600°C and 800°C were researched for copper–titanium coating with 8–63% titanium.

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