Wear Evaluation Of Seal Coating In Aeroengine

Using plasma spraying technology, AlSi-polyster coatings on the surface of 45 steel were manufactured. The spraying process of this kind of seal coating were also optimized. Studied the micromorphology, surface hardness(HR15Y) and banding strength changes of AlSi-polyster coatings which were heated at 300? for 20 h, 50 h, 100 h, 200 h and 300 h. To investigate the wear mechanism, a full-scale bench test device was manufactured. SEM was used to analyse the microstructure morphology of coating and substrate. The component of the AlSi-polyster coatings were analysed by EDS. 3D image and 2D profile of the wear track were used to explore the wear mechanism. The surface roughness of the coating were also measured.The orthogonal experimental exposes that the No.6 spraying process is the best one(spray voltage of 43.5V, current 790 A, coefficient of powder feed 11 r.min-1).The experimental of environmental condition revealed that, under an ambient temperature of 300?, the hardness on the surface and bonding strength of the coatings were decreased with the time goes. With holding time gains, some black oxide appears between the matrix and Ni5 Al coating and the complexity of the curve of AlSi-polyster coating and bounding coating were also increased. The more holding time goes, the more oxides appears in coatings.The scratch test revealed that the wear mechanism of three hardness coating were almost the same. Micro blade coating between peak, two-body abrasive and adhesive wear non-metallic phases were observed. Mars splash were observed in the scratch of higher hardness coating(HR15Y 75). Accelerating the rotation speed, the surface roughness and undulation cross-sectional profile of scratch tracks increased progressively from low to high.The surface undulating cross-sectional profile of higher hardness coating was increased from100?m to 360?m, surface roughness increases from 47.300?m to 57.778?m. The surface roughness and undulating cross-sectional profile of middle hardness coating stayed stable, and maintained at relatively modest levels(increasing from 160?m to 280?m and 22.155?m to27.090?m, respectively). Middle hardness(HR15Y 60) abradable seal coating exerted an excellent abradablility.