Thermal Spray Coating Of Aeroengine

       

The thermal spraying coating of aeroengine
mainly includes wear-resistant coating, thermal barrier coating, sealing
coating and high temperature protective coating.

1. Wear resistant coating

Because the working conditions of
aeroengine parts are very bad (high temperature, high speed, vibration and high
load), and they are subject to adhesion, abrasive, corrosion and fatigue, the
performance and service life of the engine are affected.

2. Sealing coating

Aviation gas turbine engine has a
relatively complete gas path sealing system. The system consists of 40-60
sealing devices between the shaft, drum, rotating blade tip, compressor and
turbine. The sealing device directly affects the power, thrust and efficiency
of the engine. For example, for the sealing of turbine outer ring (i.e. tip
radial clearance), according to the design requirements, every 1% increase in
the ratio of tip clearance to blade length will increase the turbine efficiency
loss by 1% ～ 3%. It can be seen that gas path sealing
is one of the important ways to improve efficiency and performance. Therefore,
abradable sealing coating is often used in the design to achieve the purpose of
gas path sealing.

There are two types of thermal spraying
sealing coatings, namely active grinding coating and abradable coating
(passive).

(1) The active grinding coating (abrasive)
is generally a hard wear-resistant gray alumina coating sprayed on the sealing
labyrinth. With the high-speed rotation of the rotor, grind the corresponding
metal honeycomb seal like a grinding wheel, and try not to wear itself. This
requires that the coating has high bonding strength, high hardness and good
thermal insulation performance.

(2) Abradable coating is required to be
soft and easy to wear, and has "runwei" performance, impact
resistance, thermal vibration resistance, and good bonding performance with the
substrate. With the further development of plasma spraying technology and
related supporting systems, plasma spraying technology will be more widely used
in aviation engine coating products.

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