Effect of carbide grain size on microstructure and sliding wear behavior of HVOF-sprayed WC–12% Co coatings

Influence of Post-treatment on the Microstructural and Tribomechanical Properties of Suspension Thermally Sprayed WC–12 wt%Co Nanocomposite Coatings

“…During spraying of WC-Co powders, significant changes in the chemical and phase compositions can occur [1]. The past two decades have seen extensive research in optimizing the feedstock powder characteristics, process parameters and post-treatments of wear-resistant hardmetal coatings [2][3][4][5][6][7][8][9][10][11][12][13][14]. Most research, however, has related to the coatings sprayed from agglomerated and sintered powders, with the typical particle size ranging from 10 to 50 lm and WC grain size ranging from 0.8 to 3.5 lm [2][3][4][5][6][7].…”

“…The past two decades have seen extensive research in optimizing the feedstock powder characteristics, process parameters and post-treatments of wear-resistant hardmetal coatings [2][3][4][5][6][7][8][9][10][11][12][13][14]. Most research, however, has related to the coatings sprayed from agglomerated and sintered powders, with the typical particle size ranging from 10 to 50 lm and WC grain size ranging from 0.8 to 3.5 lm [2][3][4][5][6][7]. Optimization of these coatings has resulted in coating microstructures with negligible porosity, high fracture toughness and minimization of secondary carbide phases [2][3][4][5][6][7][8][9][10][15][16][17][18].…”

“…Most research, however, has related to the coatings sprayed from agglomerated and sintered powders, with the typical particle size ranging from 10 to 50 lm and WC grain size ranging from 0.8 to 3.5 lm [2][3][4][5][6][7]. Optimization of these coatings has resulted in coating microstructures with negligible porosity, high fracture toughness and minimization of secondary carbide phases [2][3][4][5][6][7][8][9][10][15][16][17][18].…”

Structure of Micro-nano WC-10Co4Cr Coating and Cavitation Erosion Resistance in NaCl Solution

“…The researches of Zhao [18] and Chen [19], et al have demonstrated that the hardness and toughness of nanostructured materials can be improved simultaneously. But Dent [20] and Yang [21], et al also revealed the decrease of fracture toughness of WC based coatings with decreasing the WC size because of decarburization of nano WC followed by the formation of unwanted carbides, such as W 2 C, complex Co-W-C, and metallic tungsten, which can also lower the mechanical properties of nanostructure WC based coatings. In order to prevent the decarburization of nano WC and reduce the cost of the nano coatings, Skandan [22] and Ji [23], et al proposed a new kind of micro-nano WC based coating composed of nano and micro WC grain size, which is expected to obtain dense structure and excellent anti-cavitation performance.…”

Tribological Characteristics of Tungsten Carbide Reinforced Arc Sprayed Coatings using Different Carbide Grain Size Fractions

“…For various thermal spray techniques, numerous studies emphasized the enhanced wear resistance of WC reinforced coatings against sliding wear [1], abrasive wear RESEARCH [2] as well as erosion [3] and erosion-corrosion [4]. For high velocity oxy fuel [5,6], plasma [7,8] and suspension flame [9] sprayed coatings, several authors investigated the tribological characteristics of stressed surfaces by employing different tungsten carbide grain-sized feedstocks.…”