摘要
采用电子束物理气相沉积(EB-PVD)在单晶高温合金DD6基体上沉积NiCrAlYSi涂层。利用X射线衍射(XRD)、扫描电镜(SEM)、能谱仪(EDS)以及透射电镜(TEM)等研究了高温扩散过程中NiCrAlYSi/DD6的界面再结晶和互扩散行为。研究结果表明合金表面喷砂处理后的涂层试样经1 323K真空热处理4h后,在涂层/合金基体界面出现了厚度约为7μm的胞状再结晶区;表面未喷砂处理的涂层试样经过50h后没有出现再结晶,经过75h后形成了厚度约为15μm的再结晶区。在大气中静态氧化500h后,表面未喷砂处理试样在涂层/合金界面形成了厚度约为28μm的再结晶区,同时在合金基体中形成了厚度约60μm、以针状拓扑密堆相(TCP)为主的二次反应区(SRZ),TCP中富含W、Re和Ta元素。
In this paper,the NiCrAlYSi coatings are deposited by electron beam physical vapor deposition（EB-PVD） on nickel-based single crystal superalloy DD6.Inter-diffusion and recrystallization behaviors at the coating/superalloy interface of the coated superalloy substrates are investigated at 1 323 K by X-ray diffraction（XRD）,scanning electron microscopy（SEM） equipped with energy dispersive spectrometry（EDS） and transmission electron microscopy（TEM）.The results indicate that a recrystallization zone of ~7 μm thickness is formed at the coating/substrate interface of the blasted sample after 4 h vacuum heat-treatment at 1 323 K.Such recrystallization zone is not observed in the unblasted sample even after 50 h heat-treatment.However,a recrystallization zone of ~15 μm thickness is formed in the sample after 75 h.After 500 h isothermal oxidation in air at 1 323 K,a recrystallization zone of ~28 μm thickness is formed in the unblasted sample.Besides,a so-called secondary reaction zone of ~60 μm,basically consisting of topologically close-packed phase（TCP） needles,is formed in the superalloy.The precipitate of TCP is enriched in W,Re and Ta.
出处
《航空学报》
EI
CAS
CSCD
北大核心
2011年第4期751-757,共7页
Acta Aeronautica et Astronautica Sinica
基金
国家自然科学基金(50771059,50731001)
国家“973”计划(2010CB631200)
高等学校博士学科点专项科研基金(20070006017)~~
关键词
单晶高温合金
涂层
互扩散
再结晶
二次反应区
single crystal superalloy
coating
inter-diffusion
recrystallization
secondary reaction zone
