Erosion wear of AlSi-Graphite and Ni/Graphite abradable seal coatings

摘要

Erosion wear of AlSi-graphite, Ni/graphite medium temperature abradable seal coatings for turbine engine was investigated. The results showed that at 90° impact angle, the erosion resistance, 1/E_v, increases linearly with the increase of volume fraction of metal phase in the coatings, fm. At high angle im- pact, abrasive particles impinge on the coating surface and produce indents and extruded lips, then the lips fall off; and the flattened metal grains exfoliate. At low angle, micro-cutting, plowing and tunneling via pores and non-metal phase are predominate.