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CeO2對Ti-Al滲層組織和抗高溫氧化性能的影響
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Effects of CeO2 Addition on Microstructure and High Temperature Oxidation Resistance of Ti-Al Coating
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    摘要:

    采用漿料包滲法，以TiO2 粉為滲Ti源，純Al 粉為還原劑，NH4Cl作為活化劑，Al2O3為惰性添加劑，蛋白質(zhì)（雞蛋清）為粘結劑，在Cu表面預先鍍Ni隨后表面漿料包滲Ti-Al，制備Ti-Al共滲層。研究CeO2氧化物對Ti-Al滲層的組織和氧化性能影響。結果表明：滲劑中添加CeO2氧化物后，滲層組織由Ni-Ti金屬間化合物為主轉(zhuǎn)變?yōu)镹i-Al金屬間化合物為主，包滲過程由滲Ti為主轉(zhuǎn)變?yōu)闈BAl為主；Ti-Al滲層氧化增重由純銅的1/10降低到1/28，氧化產(chǎn)物為TiO2、Al2O3和少量的NiO，氧化層致密，沒有明顯的裂紋和空洞出現(xiàn)，改善了抗高溫氧化性能。

    Abstract:

    Using slurry pack cementation mixture with TiO2 as titanizing source, pure Al powder as reducer, NH4Cl as activator, Al2O3 as inert additive and albumen (egg white) as cohesive agent, electroplated specimens with a layer of electroplating nickel originally deposited on copper were titanized to prepare Ti-Al coating. The effect of CeO2 oxides on the microstructures and high temperature oxidation resistance of Ti-Al coating were studied. The results show that the phases of the coating are transformed from Ni-Ti to Ni-Al intermetallics, and the process of slurry pack cementation are also changed from the titanizing-base dual process to the aluminizing process after adding CeO2 oxides. The oxidation mass gain of Ti-Al coating is decreased from 1/10 of that of pure copper to 1/28. The oxide is primarily composed of TiO2, Al2O3 and a small amount of NiO. The oxide layer is dense without cracks and pores, which improves the high temperature oxidation resistance.

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王紅星,李迎光,儲成林. CeO2對Ti-Al滲層組織和抗高溫氧化性能的影響[J].稀有金屬材料與工程,2011,40(2):316~320.[Wang Hongxing, Li Yingguang, Chu Chenglin. Effects of CeO2 Addition on Microstructure and High Temperature Oxidation Resistance of Ti-Al Coating[J]. Rare Metal Materials and Engineering,2011,40(2):316~320.]
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  • 收稿日期:2010-03-23
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