2O3涂層，借助高溫原位座滴法實驗研究了Cr2O3涂層對硅基陶瓷型芯與鎳基單晶高溫合金在1550 ℃接觸后的潤濕行為以及界面反應(yīng)行為的影響，并利用SEM、EDS和XRD對界面反應(yīng)后的界面形貌、元素分布以及反應(yīng)產(chǎn)物進行了分析。研究發(fā)現(xiàn)，鎳基單晶高溫合金在涂覆Cr2O3涂層的硅基陶瓷型芯上的潤濕角為98.29°。高溫合金熔體中Hf、Al與Cr2O3涂層反應(yīng)，在高溫合金底部生成HfO2、Al2O3以及游離的Cr。生成的Al2O3形成保護層阻止高溫合金中活潑元素向界面擴散，但仍有少量高溫合金熔體與失去涂層保護的硅基陶瓷基體發(fā)生反應(yīng)，在界面處生成Al2O3以及游離的Si。生成的Cr、Si在界面處富集并在高溫合金表面生成CrSi2；部分Si自高溫合金表面向內(nèi)部擴散，與W等難熔元素在高溫合金近表面處形成（Mo,W,Re）5Si3。結(jié)果表明，鎳基單晶高溫合金在涂覆Cr2O3涂層的硅基陶瓷型芯上的潤濕角相較于在未表面改性的硅基陶瓷型芯上的潤濕角小，潤濕性好。綜合上述分析，在硅基型芯表面涂覆Cr2O3涂層有利于改善鑄件局部位置的合金充型，但對界面反應(yīng)控制效果有限。;This research applied Cr2O3 coating on the surface of silicon-based ceramic core through multi-arc ion plating method. The effect of Cr2O3 coating on wetting behavior and interface reaction behavior of silicon-based ceramic core and nickel-based single crystal superalloy after contact at 1550 ℃ were studied using high-temperature in-situ droplet method. The interface morphology, element distribution, and reaction products after the interface reaction were analyzed using SEM, EDS, and XRD. The results show that the wetting angle between nickel-based single crystal superalloy and silicon-based ceramic core coated with Cr2O3 is 98.29°. Hf and Al in superalloy melt react with Cr2O3 coating, generating HfO2, Al2O3, and free Cr at the bottom of superalloy. The generated Al2O3 forms a protective layer to prevent the diffusion of active elements in superalloy to the interface. However, a small amount of superalloy melt still reacts with the silicon-based ceramic substrate without coating protection, generating Al2O3 and free Si at the interface. The generated Cr and Si are enriched at the interface and form CrSi2 on the superalloy surface. Part of Si diffuses from the surface of the superalloy to the interior, forming (Mo,W,Re)5Si3 with refractory elements such as W near the surface of superalloy. The results indicate that the wetting angle of nickel-based single crystal superalloy on silicon-based ceramic core coated with Cr2O3 is smaller than that on unmodified silicon-based ceramic cores, and its wettability is better. Based on the above analyses, the Cr2O3 coating on the surface of silicon-based cores is beneficial to improve the filling of alloy at local positions of castings, but its control effect on interface reactions is limited."/>
2O3涂層;硅基陶瓷型芯;鎳基單晶高溫合金;潤濕性;界面反應(yīng);Cr2O3 coating;silicon-based ceramic core;nickel-based single crystal superalloy;wettability;interface reaction"/>