In tungsten-nickel-iron alloy, tungsten, as the main component, has a series of significant characteristics and plays an irreplaceable role. In terms of characteristics, tungsten has a high density of 19.3g/cm³, which is one of the elements with high density among all metals, making it the core guarantee for the alloy to achieve high density (16.5~18.7g/cm³); its melting point is as high as 3422℃, far exceeding that of most metals, endowing the alloy with excellent high-temperature resistance, which can maintain the stability of structure and performance in high-temperature environments; at the same time, tungsten also has high hardness (the Mohs hardness of pure tungsten is about 7.5) and good wear resistance, which can enhance the wear resistance of the alloy. In terms of function, the high content (80%~97%) of tungsten is the key for the alloy to have high density, a characteristic that makes it indispensable in fields such as counterweight and balance, such as balance weights in aerospace equipment; its high-temperature resistance allows the alloy to be used in high-temperature working conditions, such as some components of rocket engines; high hardness and wear resistance make the alloy suitable for manufacturing parts that need to withstand wear, such as wear-resistant components of precision molds. In addition, the good radiation resistance of tungsten enables the alloy with a high proportion of tungsten to be used in radiation shielding devices in the nuclear industry, effectively blocking the penetration of rays. In the alloy structure, tungsten exists in the form of particles, which are combined through nickel-iron binding phases to form a whole. The size and distribution of its particles will affect the density and mechanical properties of the alloy. Fine-grained tungsten helps to improve the strength and toughness of the alloy, while coarse-grained tungsten may reduce the processing difficulty to a certain extent. Therefore, the characteristics of tungsten directly determine the basic performance framework of the alloy.
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