The so-called refractory metals generally refer to metals with a melting point higher than 1650 C, in short, a melting point higher than platinum (Pt) and a certain amount of reserves.The refractory metals used in the manufacture of structural materials with high temperature resistance above 1093 F are mainly tungsten, molybdenum, tantalum and niobium.
Tungsten and molybdenum are refractory metals of the same family. On the periodic table of elements, they belong to the VIA family.
In nature, tungsten and molybdenum exist mainly in the combined state. For example, molybdenum exists in the form of MoS2, Mo-gloss and PBMoO4, and mostly is associated ore. Tungsten exists in the form of (Fe, Mn) WO4, CaWO4 and Wolframite. These deposits are unevenly distributed. Happily, the reserves of these two metals are mainly in China.
There are three smelting methods for tungsten and molybdenum: powder metallurgy, electron beam smelting and vacuum arc smelting. From the process point of view, the latter two ways have melting process, the first way has no melting process. However, in terms of application scope and material properties, powder metallurgy technology has absolutely dominant advantages. This is also related to the fact that powder metallurgy technology has natural advantages over smelting technology in controlling the morphology of metal grains and producing dispersive alloys.
Rolling and forging processes play a key role in the final density and grain orientation of materials. Because of the poor ductility of W-Mo products, it is relatively difficult to machine them.
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