As one of the important parts of military aircraft, the performance of the engine greatly affects its quality, the performance of the military engine is determined by the performance of high-temperature alloy material. As a typical representative of superalloy materials, tungsten-based alloys are the secret to the production of high-performance military engines.
Tungsten is a typical refractory metal material with a high melting point, high density, high strength, high hardness, low vapor pressure, low coefficient of thermal expansion, good chemical stability, and corrosion resistance, so it is suitable for the production of various high-temperature resistant components, such as combustion chamber, nozzle, guide, turbine disk, a tail nozzle of military engine.
Because many components of military engine work under high temperature and pressure for a long time, they must have good heat resistance, corrosion resistance, and impact resistance, so as to serve longer and reduce the probability of failure. As tungsten will not melt at high temperatures, it becomes one of the important raw materials for high-temperature-resistant engine parts.
However, due to the high density of tungsten metal (about 2.5 times of iron and 5 times of titanium), which will increase the weight of the body, be disadvantageous to energy saving and emission reduction of the aircraft, while the oxidation of pure tungsten at high temperature, resulting in the acceleration of the aging of the corresponding parts, tungsten-based alloys such as tungsten-molybdenum alloy and tungsten-rhenium alloy is commonly used to manufacture higher performance engine parts. Tungsten-based alloy is an alloy material based on tungsten and added with a small amount of molybdenum, rhenium, and other metal elements. Compared with pure tungsten, it has lower density and better thermodynamic properties.
It is worth noting that at present, due to the small output of metal tungsten and the concentration of mineral resources, most tungsten ores are contained in China, so western countries do not have enough tungsten reserves to manufacture tungsten alloy Aeroengine Parts on a large scale.
