A common type of titanium alloy metal element, it is used in many places, such as common aircraft. What are the main uses of titanium alloys in aircraft?
1. Lighten up the structure and boost its efficiency
Advanced combat performance (such as supersonic aircraft) requires the aircraft to have a relatively low structural weight factor (ie: body structure weight/aircraft normal take-off weight), and titanium alloy has the characteristics of strength close to medium-strength steel but low density, replacing structural Steel and high-temperature alloys can greatly reduce the weight of the structure and save costs at the same time; taking the engine as an example, statistics show that for every kilogram of aircraft engine weight reduced, the operating cost can be reduced by about 220-440 US dollars.
2. Comply with the use requirements of high-temperature parts
Titanium alloy has the characteristics of good heat resistance. For example, the commonly used Ti-6Al-4V can work for a long time at 350 ° C. Therefore, it can replace aluminum that cannot meet the requirements due to high-temperature performance in high-temperature parts of the aircraft (such as the rear fuselage, etc.). Alloy; BT9 can work for a long time at 500 ℃, and can replace high-temperature alloy and stainless steel in the compressor part of the engine.
3. Satisfy the criteria for compatibility with composite material structures.
In order to reduce structural weight and meet stealth requirements, advanced aircraft use a large number of composite materials. The strength and stiffness of titanium alloy and composite materials are well matched, and a good weight reduction effect can be obtained. At the same time, since the potentials of the two are relatively close, galvanic corrosion is not easy to occur, so the structural parts and fasteners in the corresponding parts should be made of titanium alloy.
4. Fulfill high corrosion resistance and long life requirements.
The high fatigue life and outstanding corrosion resistance of titanium alloy can increase the structure's corrosion resistance and life and satisfy the demands of highly reliable and long-lasting modern aircraft and engines.
