Abstract
Tungsten carbide (WC) based hard metal is known for its excellent combination of hardness and fracture toughness and has been widely used in a wide range of industrial applications such as various kinds of cutting tools and wear resistant components. Recently, it is becoming great concern to save the amounts of WC due to the increase of global demands and the national strategy of the producing countries of the raw materials. High velocity oxy-fuel (HVOF) has been widely used to deposit coatings of WC-Co. However, fracture toughness of HVOF sprayed WC-Co coatings is much lower than its sintered bodies, due to the formations of the detrimental phases such as W2C and η phase during deposition. In other words, if the toughness of the coatings can be improved, there is a great possibility to substitute a part of sintered bulk applications, and hence to lead to resource savings of tungsten. In the present paper, we investigated the possibility to fabricate degradation free WC-Co coatings by Warm Spray deposition which is a new spray technique and has the capability to control sprayed particle temperature. The microstructure and mechanical properties of those coatings were evaluated and compared with the ones by conventional HVOF deposition and the sintered bulk WC-Co. WC-Co coatings without detrimental phases were successfully deposited by Warm Sprayings but the fracture toughness was lower than HVOF coatings. The reasons of this poor fracture properties were discussed.
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