摘要
采用模拟工况的试验方法,利用高温超高速可磨耗试验机,研究了进给速率变化对AlSi/hBN封严涂层—TC4模拟叶片的磨耗行为及刮削性的影响,利用体视显微镜、扫描电子显微镜(SEM)分析了涂层和叶片的宏微观形貌;利用能谱仪(EDS)、X射线衍射分析涂层的相成分,结果表明:在温度为450℃,线速度为300m/s,进给深度500μm情况下,进给速率的改变对AlSi/hBN封严涂层—TC4模拟叶片的宏微观形貌和磨耗机制影响显著,低进给速率时,磨损严重,主要表现为切槽、叶片粘附转移和过热等机制;在中高进给速率时,可磨耗性较好,主要表现为切削和涂层材料向叶片的转移机制。
The high temperature super high speed test rig was used as a simulated method to test the AISihBN abradable seal coating and Ti-6A1-4V dummy blade and their wear behaviors and abradability were investigated. Morphology and composition of the coating and blade were observed and analyzed by Scanning Electron Microscope （SEM）, Energy Dispersive Spectrometer （EDS） and X-Ray Diffraction （XRD）. The results show that, incursion rate has a greater impact on the wear mechanism of the A1Si-hBN coating, with test at low incursion rate showing an obvious grooving and little micro-rupture, whereas test at high incursion rate showing significant cutting and adhesion. The tests were conducted at a coating surface temperature of 450℃, and at a blade tip velocity of 300m/s to simulate engine operating condition. An incursion depth of 0.5mm was set for all tests.
出处
《热喷涂技术》
2014年第3期43-49,共7页
Thermal Spray Technology
基金
国家863项目(2012AA03A512)
