Wear Behavior of Thermally Sprayed Coatings under Different Loading Conditions

Abstract

Wear behavior of three kinds of thermally sprayed coatings with similar hardness have been investigated under steady-state and dynamic loading tests. The steady-state loading tests were conducted on a reciprocating sliding device and the dynamic loading tests were conducted with a single-pendulum scratching device. Experimental results show that the wear mechanisms of the coatings under steady-state sliding friction testing are microcutting and microploughing, whereas the material losses under the dynamic impact scratch testing are mainly due to split cutting and fracture. Tribo-oxidization in the sliding process was found to have an influence on the wear behaviors of the thermally sprayed coatings. The results also indicated that wear resistance of thermally sprayed coatings can be correlated to hardness, plasticity, toughness, and cohesion. As far as the coatings of similar hardness were concerned, the wear resistance under steady-state loading was mainly due to the cohesion of the laminar structure of the coatings and the wear resistance under dynamic loading was mainly due to the toughness and deformation compatibility of the coatings.

Comportamento Ao Desgaste De Superfície Do Aço Abnt/Sae 1010 Revestido Por Aço Inoxidável Através Do Processo De Aspersão Térmica Arc Spray (As)

“…A avaliação de resultados experimentais com relação à resistência ao desgaste realizado através do dispositivo pino sobre disco, visualizado na Figura 3, mostra que o desgaste é função da carga aplicada e da granulometria do abrasivo, evidenciando que a taxa de perda de massa ou índice de desgaste é linearmente dependente das condições em que foi submetido o ensaio. [16] Comparados ao ensaio de polarização para o aço inoxidável 316L maciço, os revestimentos aplicados apresentaram comportamento inferior devido às características microestruturais. É possível observar no ensaio para o 316 maciço que para potenciais superiores (~0,50 V) há um acréscimo progressivo da densidade de corrente, devido à dissolução dos componentes da liga.…”

Micro-Abrasion Wear Behavior of Thermal-Spray-Coated Steel Tooth Drill Bits

“…Contact geometry, surface roughness, microstructural properties, grain size, toughness, speed, load, temperature, time and the environment are important parameters in the formation of wear mechanisms occurring on the surface of the wear pairs [31][32][33]. Volume losses after fixed-ball micro-abrasion wear test are given in Figs.…”

Oxidation Effects on wear Resistance of SS-304 and SS-316 Austenitic Stainless Steels

“…Author has optimised the process parameters for both chromium carbide and titanium carbide surface alloying treatments, so that improvement of the sliding wear resistance of AISI 316L stainless steel may occur without any ill effect on high temperature oxidation resistance. Coatings have been used widely to improve the wear resistance of the stainless steels [13][14][15][16][17][18][19][20][21]. Parthasarathiet.…”