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在细散粒子流中运行的航空燃气涡轮、蒸汽透平和燃煤透平易受磨蚀而性能下降。本文叙述用于求出粒子回弹系数的试验方法和高温下承受燃气粒子流磨蚀的超级合金、敷铝涂层(RT22、RT22B、RT44和RT44B)的磨蚀行为特性。用一种专门设计的磨蚀风洞,实验研究了该磨蚀行为特性,其结果揭示了速度、温度和碰撞角度对磨蚀速率的影响.还研究了碰撞粒子的质量对重量损失和磨蚀速率的累积效应。用试验过程中收集到的数据,导出了预测INCOIN-738和FSX-414超级合金磨蚀速率的经验模型。根据粒子质量对重量损失和磨蚀速率的影响的试验结果,估算了不同粒子浓度下的涂层寿命。
Aeronautic gas turbines, steam turbines and coal-fired turbines operating in fine particle flow are subject to erosion and deteriorate in performance. This article describes the test methods used to determine particle resilience and the wear behavior of superalloys, aluminum-coated (RT22, RT22B, RT44, and RT44B) superalloys subjected to gas particle flow erosion at high temperatures. This abrasive behavior was experimentally studied using a specially designed abrasive wind tunnel and the results revealed the effect of velocity, temperature and collision angle on the erosion rate. The cumulative effect of mass of colliding particles on weight loss and abrasion rate was also studied. Using the data collected during the experiment, an empirical model for predicting the wear rates of INCOIN-738 and FSX-414 superalloys was derived. Based on the test results of particle mass impact on weight loss and abrasion rate, the coating life at different particle concentrations was estimated.