K52合金纳米晶涂层的1000℃氧化行为
Oxidation Behavior of Superalloy K52 at 1000℃
摘 要
对K52合金及其溅射纳米晶涂层在常压空气中进行了1 000 ℃抗氧化试验,用X射线衍射(XRD)、扫描电镜能谱仪(SEM/EDX)、透射电镜(TEM)和电子探针(EPMA)等方法,对涂层形貌、组织和组成相以及氧化物的成分等进行了测定.研究结果表明:K52纳米晶涂层的抗高温氧化性能优于其基体合金.这主要由于纳米晶涂层表面生成了均一、致密的的α-Al2O3膜,而铸态合金则生成了疏松的Cr2O3和TiO2的混合氧化膜.讨论了氧化膜的形成机理.
溅射
纳米晶涂层
高温氧化
K52 alloy
sputtering
nanocrystalling coating
oxidation
Abstract
The oxidation behavior of cast alloy K52 and its sputtered nanocrystalline coating at 1 000 ℃ in air were investigated by means of XRD,SEM/EDX,TEM and EPMA.The results showed that the sputtered nanocrystalline coating possessed better oxidation resistance than the cast alloy,which was contributed to the formation of α-Al2O3 layer on the sputtered coating,whereas a mixed oxide film of Cr2O3 and TiO2 was formed on the cast alloy.The formation mechanisms of the oxid films were discussed.
中图分类号 TG174.44
所属栏目 试验研究
基金项目
收稿日期 2007/4/3
修改稿日期 2007/5/8
网络出版日期
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引用该论文: TIAN Xiu-juan. Oxidation Behavior of Superalloy K52 at 1000℃[J]. Corrosion & Protection, 2008, 29(3): 125～127
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参考文献
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【2】Shi D Z,Rapp R A.The solubility of SiO2 in fused Na2SO4 at 900℃[J].J Electrochem Soc,1986,133:849-850.
【3】Whittle D P.In high temperature alloys for gas turbines[J].Appl Sci Pub,1978:665-699.
【4】Lou H Y,Wang F H.High temperature oxidation resistance of sputtered micro-grain superalloy K38G[J].Oxid Met,1992,38:299-307.
【5】LIU Z,GAO W,DAHM K,et al.The effect of coat grain size on the selective oxidation behavior of Ni-Cr-Al alloy[J].J Scrip Mater,1997,37:1551-1558.
【6】LIU Z,GAO W,DAHM K,et al.Oxidation behavior of sputtered deposited Ni-Cr-Al microcrystalline coating[J].J Acta Mater,1998,46:1691-1700.
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