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科学技术的发展和钨具有的特殊性质,使钨在工业上的用途日益广泛。同时各个应用领域对钨的质量的要求也愈来愈高,因为钨的物理化学性质在很大程度上取决于其纯度。例如,对制造硬质合金来说少量钼有益于提高合金的硬度和性能,但会降低合金的强度。对于制造钨丝用钨,要求含钼量更为严格,WO_3中Mo的含量不应超过0.02％。含杂质最高达0.05％的钨酸只能用来制造金属钨。含铁0.1％的钨,由于其脆性,几乎不能作为延性钨使用。要提
The development of science and technology and the special nature of tungsten have made the use of tungsten increasingly widespread in industry. At the same time, the quality of tungsten in various fields of application is also getting higher and higher, because the physicochemical properties of tungsten depend largely on its purity. For example, a small amount of molybdenum for the manufacture of cemented carbides can improve the hardness and properties of the alloy but reduce the strength of the alloy. For the manufacture of tungsten wire tungsten, molybdenum content required more stringent, WO_3 Mo content should not exceed 0.02%. Tungstic acid containing impurities up to 0.05% can only be used to make tungsten metal. Tungsten 0.1% iron, due to its brittleness, can hardly be used as a ductile tungsten. To mention