Consolidation of ultra fine WC and WC–Co hard materials by pulsed current activated sintering and its mechanical properties

Structure and thermal decomposition of ammonium metatungstate

“…One of their major applications is that tungsten oxides, metal tungstates, tungsten carbides or tungsten metal can be prepared from them, all of which are significant for various industries. Tungsten oxides can be used as catalysts [2][3][4][5], photocatalysts [6][7][8][9][10], gas sensors [11][12][13][14][15][16][17][18], chromogenic materials [19][20][21]; metal tungstates can be used among others as catalysts [22], pigments [23,24]; tungsten carbides are the hard components in cutting, drilling, tools [25][26][27] and they are also used as catalysts [28,29]; while tungsten metal is a key element in lighting industry [1,[30][31][32][33][34].…”

Mechanical Alloying: For Formation of Nanocomposite WC/MgO Materials

“…As stated above, WC/MgO composite can be a new advanced hard refractory material. In Table 6, we provide a comparison of the hardness and fracture toughness values of WC/MgO compacts with those of WC-Co reported by others (Richter & Von Ruthendorf, 1999;Almond & Roebuck, 1988;Kim et al, 2007 Studying the mechanism involved in the synthesis, we find that mechanical alloying processing can agitate the reaction mass and continually bring unreacted materials into contact, preventing the products from dividing the reactants separately. This results in a significant increase in reaction rate which provides the occurrence of WC/MgO formation at ambient temperature.…”

The Effect of Cr3C2 and TaC Additives on Microstructure, Hardness and Fracture Toughness of WC-6Co Tool Material Fabricated by Spark Plasma Sintering

“…Of course, all of them cannot occur simultaneously, and the dominant wear mechanism depends on the machining conditions and work materials [4][5] . Morphologically, WC-Co cemented carbides consist of hard WC embedded in ductile Co [6][7][8][9] . Increasing the WC fraction can increase hardness and wear resistance, while fracture toughness can increase by increasing the Co content [9][10] .…”

“…Morphologically, WC-Co cemented carbides consist of hard WC embedded in ductile Co [6][7][8][9] . Increasing the WC fraction can increase hardness and wear resistance, while fracture toughness can increase by increasing the Co content [9][10] . That is why WC-Co cemented carbides with 5-10 wt% Co are the most promising materials offering a very good balance of hardness and fracture toughness 10 .…”