Abstract
The friction and wear behaviour of several kinds of middle temperature abradable seal coatings used in aircraft turbine engine was investigated. Their abradability was evaluated by sliding worn volume. The mechanisms of the sliding wear of the coatings are abrasive wear, adhesive wear and oxidation wear, but the weight of the adhesive wear and abrasive wear is different in different coatings and under different test loads. The results show that the abradability decreases with the increase of the hardness for a given kind of coating. Even if the hardness is close, the abradability is very different in different kinds of coatings. So, only by the hardness can the level of abradability not be not judged and the coating not be chosen and designed. The abradability of M313 type of coating is the best, M310 is close to M601 and M307 with low hardness is fairly good, but M307 with high hardness is the worst.
Highlights
Large propulsive force, high efficiency and low fuel consumption are the objectives of the design and manufacture of aircraft turbine engine
Even if the hardness is close, the abradability is very different in different kinds of coatings
The abradability of M313 type of coating is the best, M310 is close to M601 and M307 with low hardness is fairly good, but M307 with high hardness is the worst
Summary
Large propulsive force, high efficiency and low fuel consumption are the objectives of the design and manufacture of aircraft turbine engine. The thermal sprayed abradable seal coating has been used because of its simple manufacturing processes, easy repair of the components, easy adjustment of its properties and good sealing effectiveness. It can provide thermal barrier for the casing, and reduce the influence of high temperature fuel gas on the casing w2x. The abradability and erosion resistance are the most important properties of the abradable seal coating They are contradictory w4x, and the coating should provide a good balance between the abradability and the erosion resistance
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