Oxidation behavior of plasma sprayed Al@NiCr with cyclic thermal treatment at different temperatures

Oxidation behavior of plasma sprayed Al@NiCr with cyclic thermal treatment at different temperatures
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不同温度循环热处理等离子喷涂Al@NiCr的氧化行为

DOI:
10.1016/j.corsci.2011.10.017
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发表时间:
2012-02
期刊:
影响因子:
8.3
通讯作者:
Xueqiang Cao
Xueqiang Cao
中科院分区:
材料科学1区
文献类型:
--
作者:
Lijian Gu;Binglin Zou;Xizhi Fan;Shuibing Zeng;Xiaolong Chen;Ying Wang;Xueqiang Cao

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以Al@NiCr粉末为原料,采用常压等离子喷涂技术制备了独立式非均匀涂层。讨论了在空气中循环氧化后的氧化动力学和机理。在800℃时发生了轻微的互扩散,但在更高温度下以氧化过程为主。在1100℃以上,Cr的氧化变得明显,并以CrO3的形式挥发。在1100℃时,Ni的氧化也变得严重。当内部通道充满氧化物时,氧化作用被抑制。然后出现两个阶段的氧化,两个阶段都服从抛物线速率定律。外表面的缓慢氧化在第二阶段起关键作用。
Freestanding and inhomogeneous coating was prepared by atmospheric plasma spray using Al@NiCr powder. Oxidation kinetics and mechanism are discussed after cyclic oxidation in air. Slight interdiffusion occurred at 800°C but oxidation process took a dominant position at higher temperature. The oxidation of Cr turned significant above 1100°C and volatilized as CrO3. The oxidation of Ni also became severe at 1100°C. The oxidation was suppressed when internal channels were filled up with oxides. Then two stages for oxidation appeared, both of which obeyed parabolic rate law. The slow oxidation of external surface played a key role at the second stage.
镍基单晶高温合金上 NiAlDy/RuNiAl 涂层的循环氧化和相互扩散行为
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