2為活化劑，采用包埋法在NiCrW基高溫合金表面制備了NiAl涂層。采用X射線衍射、掃描電子顯微鏡和能譜儀對涂層表面和橫截面進行了分析。結(jié)果表明，CaCl2可以替代NH4Cl，是一種有效的活化劑。在950 ℃下，通過4 h的包埋滲鋁，制備出幾乎為單相、厚度為30 μm的NiAl涂層，涂層與基體之間為富鉻中間層。當包埋滲劑填充率小于100%時，NiAl層表面生成針狀θ-Al2O3。在1000 ℃恒溫空氣氧化試驗中，NiAl涂層開始時被高速氧化，然后逐漸變?yōu)榫徛趸瓿闪藖喎€(wěn)態(tài)針狀θ-Al2O3向穩(wěn)態(tài)不規(guī)則顆粒狀α-Al2O3的轉(zhuǎn)變，最終穩(wěn)定的α-Al2O3為基體提供了良好的抗氧化保護。;The NiAl coating was prepared on the surface of NiCrW-based superalloy by pack cementation method with CaCl2 as an activator. The surface and cross-section of the coated specimens were analyzed via X-ray diffraction and scanning electron microscopy coupled with energy dispersive spectroscopy. Results show that CaCl2 can replace NH4Cl as an effective activator. The NiAl coating with an almost single phase structure and a thickness of 30 μm can be obtained after pack cementation at 950 °C for 4 h. A chromium-rich interlayer can be observed between the NiAl coating and the substrate. When the filling ratio of the pack powder is less than 100%, the needle-like θ-Al2O3 phase is formed on the NiAl layer surface. During the constant temperature air oxidation test at 1000 °C, the NiAl coating suffers from high speed oxidation to slow speed oxidation, which is in agreement with the phase transformation from needle-like metastable θ-Al2O3 to irregular granular stable α-Al2O3. The final stable α-Al2O3 provides a good oxidation resistance for the substrate."/>