First of all, it is the most important and the most direct way to realize the requirement of high speed and low fuel cost.
It was observed that when the plane reached Mach 2 (Mach 2), the plane's body temperature could reach 300 degrees Celsius.In addition, with the increasing efficiency of gas turbine engines, the latest engine temperature has been increased year by year, and the newest engine turbine inlet temperature of V2500 has exceeded 1400 degrees Celsius.Although the existing fuselage material can meet the current demand.But if there is a more heat-resistant, lighter compound, no vendor can resist the temptation to live with it.
Second, through to the national development of the space shuttle and supersonic aircraft, the aircraft developed from previous aircraft main difference lies in the use of the body will reach a temperature of 1800 degrees or so, for the material, its strength, durability, such as oxidation resistance can keep stable in any severe conditions.With the development of heat resistant materials, the titanium alloy composites are gradually catching the scientists' eyeballs.
In 2007, Boeing's latest 787 test flight was successful.The new aircraft is 20 percent less fuel-efficient than older aircraft, 80 percent less nitrogen and significantly less noise, causing global concern.
It is reported, the Boeing 787 engine by America's general electric (GE), with 4822 titanium alloy instead of nickel base superalloy, produce for the last two levels of environmental temperature and the lowest risk of low pressure turbine blades.This is the first application of titanium aluminum to aviation engines.The move by GE, which has caused a staggering loss of 200 pounds in a single engine on the aircraft's engines, has caused a stir in the aviation industry.
Aircraft engine is known as the heart of the aircraft, among them, the turbine blade is the core of the key components in aircraft engine, it also determines the manufacturing material must be able to work under bad working conditions, such as in the high temperature.The traditional nickel-base alloys, while good in all respects, are too cumbersome and run counter to the idea of lightweight aircraft engines.And the research and development of titanium alloy using temperature is 900 degrees above, can already and nickel base alloy "arm-wrestling", the nanjing university of technology professor Chen guang led the team has realized three breakthroughs on material performance.
1. The stretch plasticity and yield strength of room temperature were greatly improved.
2. Excellent resistance to creep;
3. The bearing capacity is greatly improved.
