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Coating superalloys using CVD

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In various RET-Monitor articles on materials, the use of superalloys in race engines has been covered. Their originally intended use was in gas turbine engines for the aerospace industry, and they were developed specifically for their capability at elevated temperatures. They are directly responsible for significant steps forward in gas turbine engine development, with limiting component surface temperature having increased well over 150 C since the 1970s due to materials alone. In...

PVD – the importance of cleanliness

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Such has been the rapid rise and acceptance of the hard, thin engineering coatings in many industries that they now form a part of the design specification for new parts. In the past, the use of such coatings was an exercise in research or a last attempt to solve a problem, but they are now accepted as a necessary part of achieving efficiency or reliability. While they do increase the cost of a single component, it is very often the case that such components would either not work without...

Bearing coatings

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We could successfully argue that many plain bearings are actually little more than coatings, and that the shell is simply a carrier for the very thin layer of material which is doing the hard work for us. That would be ungenerous though, as plain bearings rely heavily on their backing to provide strength, adhesion and thermal conductivity. The shells also have a very important role to play in controlling clearances. However, some applications are sufficiently lightly loaded to allow...

Using thermal barriers for driver comfort

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We have discussed the use of thermal barrier coatings for many reasons in the past, including mitigating heat transfer to areas of the engine which cost performance, protecting electronic components which can suffer reliability problems when the melting point of the solder is reached, to the reduction of heat transfer to the transmission system from literally red-hot exhaust systems. These are all very important considerations. Ask any engineer who has worked with the very best cars and...

Plasma/thermal sprayed valve seats

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The subject of valve seat materials has been dealt with in RET-Monitor before; an article published in 2012 briefly discussed the requirements for seat materials. There are several important requirements for a valve seat material. It is generally responsible for the vast majority of heat transfer from the poppet valve, it needs to be strong enough not to be deformed by the action of the valve closing onto it, and it needs to be resistant to corrosion, seizure and wear in service. The heat...