空心叶片内腔化学气相沉积设备及抗氧化涂层研究

由于高效气冷空心叶片内腔的结构越来越复杂,采用物理气相沉积(PVD)和等离子喷涂(PS)技术不能进行空心叶片内腔冷却通道的涂层防护,化学气相沉积可以进行冷却通道内表面抗氧化涂层的防护.通过CVD涂层设备的研制、涂层沉积工艺、高温涂层性能等研究,对内腔涂层的涂覆机理、工艺方法和内腔涂层的应用进行了讨论.结果表明:研制的CVD设备可靠、工艺参数稳定、内腔表面涂层涂覆达到100%,所研究的化学气相渗铝涂层具有优良的高温抗氧化性能,其在先进航空发动机高效气冷空心叶片内腔表面有很好的工程应用前景.

Study of CVD Equipment and Protective Coatings for the Surface of Internal Cooling Channels in Turbine Blades

With the development of more sophisticated cooling schemes,the structure of internal channels of blades becomes more complicated,which led to the difficulty in coating those sections.Due to the limitation of techniques,physical vapor deposition(PVD) and plasma spraying(PS) could not carry out to coat internal channels.But chemical vapor deposition(CVD) techniques can meet the demand of coating internal channels.Advanced CVD equipment,internal coating technique,performance of coating for internal channels of blades has been discussed.The result showed that the CVD equipment for internal coating was reliable and vapor aluminide coatings had good oxidation resistance,the parameter and process were stable and 100% internal surface were covered.The CVD protective coatings for the surface of internal cooling channels could be used in advanced aircraft engine blades.