Application of titanium in aerospace field

Titanium used in aerospace is concentrated in western countries, especially the United States, where 60 percent of titanium is used in this field. Asian countries, Japan and China have all invested about 10 per cent in the sector. However, with the rapid development of Asian aerospace in recent years, the consumption of titanium in the aerospace field will increase accordingly. From a global perspective, the aviation industry plays a decisive role in the titanium market. Historically, the major cycles of the titanium industry are closely related to the temperature and temperature of the aviation industry.


In 2011, global titanium production reached 148000 tons, including commercial aviation use about 64000 tons of titanium, the future of global economic growth, the demand for air transport is still huge, is expected to demand about 30000 new aircraft over the next 20 years or so, at the same time, demand for new aircraft to titanium is higher than the old aircraft, commercial aircraft is expected to 20 years to the titanium demand will reach an average of 40 tons/frame; Based on this calculation, in the next 20 years, the global commercial aviation sector will add about 1.2 million tons of titanium demand, the annual compound growth rate of about 17%, the average annual increase of 60,000 tons of titanium demand, civil aviation titanium field will show rapid growth. There will also be new opportunities in military aviation; Military aviation is also expected to see new demand as countries around the world increase military spending amid geopolitical tensions.


Civil aircraft

The main USES of titanium alloys in aircraft are as follows:


(1) reduce the structure weight, improve the efficiency of the structure, advanced performance, such as supersonic aircraft lighter aircraft with low structure weight coefficient (i.e., the body weight/structure plane normal take-off weight), and the intensity of titanium alloy is close to the characteristics of strong steel but density is small, instead of structural steel and high temperature alloy, can greatly reduce the structure weight, also can save cost; Take engines, for example. Statistics show that the cost of using an aircraft engine can be reduced by about $220-440 per kilogram of reduction in quality.


(2) meet the requirements of high temperature parts: titanium alloy has good heat resistance, such as the commonly used ti-6al-4v can work at 350℃ for a long time, so in the high temperature parts of the aircraft (such as the rear fuselage) can replace the aluminum alloy due to high temperature performance can not meet the requirements; TC11 can work at 500℃ for a long time and can replace superalloy and stainless steel in the compressor part of the engine.


(3) meet the requirements of matching with the composite structure: in order to reduce the weight of the structure and meet the stealth requirements, advanced aircraft use a lot of composite materials, titanium alloy and composite material strength, stiffness match well, can obtain a good weight reduction effect. At the same time, because the potential of the two is relatively close, it is not easy to produce electric corrosion, so the corresponding parts of the structure and fasteners should be titanium alloy.


(4) meet the requirements of high corrosion resistance and long life: titanium alloy has a high fatigue life and excellent corrosion resistance, can improve the corrosion resistance and life of the structure, meet the requirements of advanced aircraft and engine high reliability and long life.


Military aircraft

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The development and procurement of military weapons have been developing in a light and flexible direction. In order to meet the requirements of combat performance of fighter aircraft, in addition to adopting advanced design technology, materials with excellent performance and advanced manufacturing technology must be adopted. It is one of the important measures to select titanium alloy and improve the application level of advanced titanium alloy. Since the 1960s, the amount of titanium used by foreign military aircraft has been increasing year by year. Currently, the amount of titanium alloy used by various advanced military fighters and bombers designed by Europe and America has been stable at more than 20%, and the proportion of titanium used by new aircraft is greatly increasing.