Tungsten-nickel-iron alloy is a high-specific-gravity alloy with tungsten as the matrix and nickel and iron as the binding phases. The tungsten content usually ranges from 80% to 97%, and the total content of nickel and iron accounts for 3% to 20%, with the ratio of nickel to iron generally maintained at about 3:1. This alloy is not produced by traditional smelting methods but by powder metallurgy, a process feature that allows it to perfectly combine the excellent properties of tungsten such as high density and high melting point with the plasticity and workability of nickel-iron alloys. In terms of performance, it not only has the high density (usually between 16.5 and 18.7g/cm³), high hardness and excellent high-temperature resistance of tungsten but also possesses certain toughness and machinability, overcoming the defects of pure tungsten’s high brittleness and difficulty in processing. In the field of application, due to its unique combination of properties, it is widely used in balance weights in the aerospace field, core of armor-piercing projectiles in the national defense industry, radiation shielding components in medical equipment, and precision parts in the electronics industry. Its definition not only includes its composition and preparation process but also reflects its irreplaceable comprehensive performance advantages in industrial applications, making it a special alloy material with both functionality and practicality.
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