Abrasive wear behavior of thermally sprayed diamond reinforced composite coating deposited with both oxy-acetylene and HVOF techniques

Abstract

Diamond and diamond-based coatings have long been studied for their exceptional properties. Although a great deal of research has been carried out in this field, little is known about their tribological wear behavior. In the present work, diamond reinforced composite (DRC) coatings of varying diamond content was deposited on mild steel substrates using both oxy-acetylene (OA) and high velocity oxy fuel (HVOF) thermal spraying techniques. The high stress abrasive wear behavior of these coatings is studied by performing two body abrasion tests for varying experimental parameters. It is observed that the HVOF-sprayed coatings suffered abrasion at a relatively low wear rate. The reasons for variations observed in the wear rate as a function of displacement during abrasion and grit size could be attributed to the deterioration of abrasive particles and the particle size effect respectively. While the disparity in the wear rates with respect to composition of the coatings was primarily controlled by the diamond content in the coating. The abrasive wear mechanism was found to be the same in both the coatings except that the coating deposited by HVOF spray technique, offered better abrasion resistance and therefore abraded at a slower rate. This is possibly due to lower porosity in the coating and higher bond strength between reinforced diamond particulates and the bronze matrix in HVOF-sprayed specimens.

Cold‐Sprayed Metal Coatings with Nanostructure

“…Diamond-reinforced MMCs are novel materials in which the metallic phase acts as a binder, while the diamond phase helps to improve the material properties. Currently, the common ways to fabricate bulk diamond-reinforced MMCs or MMC coatings are powder metallurgy [95][96][97][98][99], pressure infiltration techniques [100][101][102][103][104], and thermal spray techniques [105][106][107][108][109]. ese methods mostly require extremely high processing temperatures to melt the metal binder, thereby significantly increasing the risk of the metal phase transformation and diamond graphitization [97].…”

Tribological Behavior of Bronze Composite Coatings Obtained by Plasma Thermal Spraying

“…8,9). This wear mechanism is present when WC-6%Co or steel are used as counterface, because of the lower hardness of the bronze matrix.…”

“…The addition of TiN and quasicrystal AlCuFeB particles are used in tin-bronze coatings fabricated by cold spray process to improve their wear resistance [7]. Diamond and WC are also used to increase the tribological properties of Cu-base coatings deposited using thermal spraying technique [8,9] and the addition of other hard particles produce coatings, which can be used as superabrasives for grinding minerals and stones [10].…”

Recubrimientos de materiales compuestos metal-cerámico obtenidos por nuevas tecnologías de proyección térmica: Proyección fría (CGS) y su resistencia al desgaste

“…De esta manera, se realizan recubrimientos de NiCrBSi para aplicaciones que soportan corrosión, temperatura y desgaste [16] . Las propiedades triboló-gicas del bronce pueden mejorarse utilizando partí-culas reforzantes de diamante utilizando la proyección térmica de llama [17] . También se ha publicado que mediante proyección fría se puede mejorar las propiedades antidesgaste del bronce utilizando partículas de diamante finamente envueltas por un film de níquel que favorece su deposición en el recubrimiento [18] .…”