Effect of alloying on the oxidation behaviour of Co–Al–W superalloys
Effect of alloying on the oxidation behaviour of Co–Al–W superalloys
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DOI：
10.1016/j.corsci.2014.03.002
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发表时间：
2014-06
影响因子：
8.3
通讯作者：
H.-Y. Yan;V. Vorontsov;D. Dye
中科院分区：
文献类型：
--
作者：
H.-Y. Yan;V. Vorontsov;D. Dye
研究了Co-7Al-7W （at.%）合金在800℃的等温循环氧化过程。Cr、Fe和Si的添加是有益的。非cr合金在循环过程中形成了重复的氧化双分子层，其厚度为100 μm，不具有保护作用。在这些层中，外层是co3o - 4，内部是多孔的co3o - 4和al2o3混合物。10。% Cr取代Co足以产生约1 μm厚的保护层，其外层为al2o3，中间层为cr2o3，中间层为al2o3，内层为al2o3。因此，在γ/γ′，Co-Co 3 （Al， W）高温合金中可能存在保护氧化层。
The 800° C isothermal and cyclic oxidation of alloys based on Co–7Al–7W (at.%) was examined. Cr, Fe and Si additions were beneficial. Repeated oxide bilayers formed during cycling of non-Cr alloys, which were not protective (> 100 μm thick). In these layers, the outer was Co 3 O 4 and the inner, a porous Co 3 O 4 and Al 2 O 3 mixture. 10 at.% Cr substitution for Co was sufficient to produce a protective,∼ 1 μm thick scale which contained an outer layer of Al 2 CoO 4, a very thin (100 nm) middle layer of Cr 2 O 3 and an inner layer of Al 2 O 3. Therefore protective oxide scales are possible in γ/γ′, Co–Co 3 (Al, W) superalloys.