Cemented Tungsten Carbides | ScienceDirect
The primary sources of tungsten are the minerals, Scheelite (CaWO 4) and Wolframite (Fe,Mn)WO 4. In mixed carbides where cubic monocarbides (TIC, TaC) exist with hexagonal tungsten carbide, because of high carburization temperature for the systems, the mixed phases are normally supersaturated with tungsten carbide.