ABRADABILITY EVALUATION AND TRIBOLOGICAL BEHAVIOUR OF ABRADABLE SEAL COATING
(1.State Key Laboratoryfor Powder Metallurgy, Central South University of Technology, Changsha 410083, P. R. China
2.State Key Laboratoryfor Mechanical behaviour of Metallic Materials, Xi′an Jiaotong University, Xi′an 710049, P. R. China)
2.State Key Laboratoryfor Mechanical behaviour of Metallic Materials, Xi′an Jiaotong University, Xi′an 710049, P. R. China)
Abstract: The abradability is one of the most important properties of abradable seal coating used in aircraft turbine engine. The abradability of several kinds of middle temperature abradable seal coatings was evaluated by sliding worn volume. Their tribological behaviour and wear mechanism were investigated. The results show that the abradability decreases with the increase of the hardness for a given kind of coating. Even if the hardness is the same, the abradability is largely different in different kinds of coatings. So, only by hardness, the level of abradability can not be judged and the coating can not be chosen and designed. The abradability of 313 type of coating is the best, 310 is close to 601 and 307 with low hardness is fairly good, but 307 with high hardness is the worst. The mechanisms of 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.
Key words: abradable seal coating abradability sliding friction and wear