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British Development Of 1500 Degrees Of Resistance To High Temperature Titanium Alloy Coating?
Jan 11, 2017

Britain recently developed a high temperature resistant (mainly aluminum alloy) metal coating technology, used to coat the "Elizabeth" aircraft carrier flight deck - known as resistance to high temperature of 1500 degrees. The reason for this is that the F-35B fighter aircraft in the vertical landing, the tail gas jet will form a high temperature corrosion effect on the flight deck.

So for this news, we can put forward three questions: first, is F-35B and the carrier, it does not take into account the problem of high temperature damage to gas? Secondly, why is the use of aluminium and titanium alloys, it can block the temperature of 1500 degrees? Finally, this reform can provide a long time protection? The answer to the first question is considered, but the actual situation is much worse than the design. For F-35B, the VTOL power system had two choices; simple method is designed according to Jacques's 141, set the 1-2 table structure is simplified in the fuselage front (such as canceling afterburner, simplified Compressor Series) turbojet engine, providing vertical lift. The complex method is to use the complex transmission mechanism from the main engine to drive the fan to blow enough lift.

Only from the performance of the aircraft itself, Jacques's 141 way is simple, convenient and high - lift the engine working time is very short life requirement is not high things, the thrust can teach very terrible. But this route, in fact, is the complexity of the design and manufacture of warships and flexibility to adapt to the venue at the expense of the performance of the aircraft itself. Because of the very high temperature gas lift engine, to bear Jacques 141 such aircraft taking off and landing, the flight deck itself must be heat resistant metal but also to the use of water circulation cooling, is actually made a particularly large paved carrier baffle. F-35B want to get around this problem, the lower performance, manufacturing is more complex and costly lift fan scheme; but the test results show that it does not completely solve the problem of high temperature jet landing deck still needs to be strengthened.

The answer to the second question is that the high aluminum content of titanium Aluminum Alloy on alumina protective film can be continuously formed stable on the surface, this is it for resist high temperature oxidation (corrosion problem of the British aircraft carrier deck is terrified of the key) and titanium fire (again, very active in the high temperature properties of titanium high temperature titanium alloy, is not inferior key advantage). As for the resistance of 1500 degrees, which is blown out; titanium aluminum alloy high temperature titanium alloy working temperature limit of 550 degrees as a watershed, to the degree of performance and prices are very high 600. Besides the F-35B tail jet where the temperature is so high, that is, Jacques 141 lift engine is not.

The answer to the third question, seems to be able to use quite a long time, it is said that life can reach up to 50 years, the aircraft carrier life without maintenance. It is about 10000 DEG C by plasma heating of metal powder, the melted metal forming droplets spread and rapid curing, 2.5 mm thick coating; laying area of 2000 square meters, accounting for about 10% of the total area of the flight deck.

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