Performance evaluation of HVOF deposited cermet coatings under dry and slurry erosion

Abstract

The present work reports on the examination of three High Velocity Oxy Fuel deposited coatings, Tungsten Carbide, Chromium Carbide and Aluminium Oxide, under slurry erosion and dry erosion conditions. The density and hardness of coatings produced in this manner are typically superior to other thermal spray processes, and are therefore suitable for use in corrosive and highly erosive environments. The primary aim of this investigation was to establish the total mass and volume loss from each coating under dry and slurry erosion testing conditions and compare the level of material loss following the respective testing regimes. The scope of the study incorporated the application of cathodic protection to prohibit the effects of corrosion in the case of slurry erosion testing. This approach ensured that any damage to the surface could be attributed to pure erosion, and as such, be assessed against the dry erosion test data. Subsequent examination of the resulting wear scars facilitated assessment of the level of damage caused by the impinging slurry. Results revealed variation in the level of degradation experienced by each coating type under the respective test conditions. Under both dry erosion and slurry erosion, Tungsten Carbide with a Cobalt binder proved an effective protective coating by exhibiting a reduction in material loss over other assessed coatings

Impact of high‐velocity oxy‐fuel sprayed TiAlN surface coating on mechanical and slurry erosion performance of aluminium alloys

“…At 90°of impingement angle, the erosion on the damaged surfaces is dominated by the production of craters and some of the removed material lying inside or on the periphery of formed craters as evident from, Figure 8c-d. All these observations suggest that the material removal in coated samples undergoes both ductile and brittle mode of erosion. Similar results were also reported in the literature [30].…”

“…The erosion performance of base samples was observed to be similar to ductile materials [7,29]. In case of low impingement angles, material may be removed by cutting due to shear deformation as identified by previous research [30]. On the other hand, the TiAlN coated samples exhibit opposite trend in erosion performance to that of base samples as a marked improvement was observed for erosion rate at lower impingement angle.…”

Characterization of a coating 316L applied by plasma transferred arc

“…Eksperiment je sproveden primenom erozionog testa, koristeći opremu za peskarenje sa namenski konstruisanim postoljem nosača uzorka, Slika 4. Slične instalacije za ispitivanje erozione otpornosti materijala su korišćene i u drugim studijama [36][37][38]. Pri ovom ispitivanju analiziran je uticaj promene ugla nastrujavanja i brzine čestica erodenta na gubitak materijala prevlake.…”

Modeling of Erosion Response of Cold-Sprayed In718-Ni Composite Coating Using Full Factorial Design

“…Although in some cases SPE is a beneficial phenomenon, such as in high-speed abrasive waterjet cutting and sandblasting, it can cause damage in many engineering systems, including aircraft engines, steam and jet turbines, and pipelines [1]. The gradual material removal from surfaces may lead, in the worst cases, to the entire replacement of the damaged or degraded component, entailing a considerable replacement expense, which may exceed half of the production cost [2][3][4]. Among the several methods available, surface coating is one of the most effective technologies that has been extensively used for reducing the detrimental effect of SPE and improving components' erosion resistance [5][6][7][8].…”