Lifetime of Thermal Barrier Coatings Deposited on γ-TiAl Based Alloys Using Intermetallic Ti–Al–Cr Bond Coats with Additions of Yttrium and Zirconium
Lifetime of Thermal Barrier Coatings Deposited on γ-TiAl Based Alloys Using Intermetallic Ti–Al–Cr Bond Coats with Additions of Yttrium and Zirconium
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DOI：
10.1007/s11085-013-9424-9
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发表时间：
2014-02
影响因子：
2.2
通讯作者：
N. Laska;R. Braun
中科院分区：
文献类型：
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作者：
N. Laska;R. Braun
在γ-TiAl基合金Ti-45 Al-8 Nb（at.%）表面制备了氧化钇稳定的氧化锆热障涂层（TBC）。使用电子束物理气相沉积。粘结层为10 μm厚的Ti-Al-Cr金属间化合物层，并添加Y和Zr。在900 ° C和1，000 °C的空气中进行的循环氧化试验表明，Ti-Al-Cr-Y粘结层具有优异的抗氧化性，这与热生长氧化铝氧化皮以及金属间化合物层中富Y颗粒的沉淀有关。发现含锆粘结涂层的保护性能较差。在900 °C下，两种TBC系统的寿命均超过1，000个1小时循环。在1,000 °C下发生氧化锆面漆的边缘碎裂。如通过横截面检查所观察到的，具有Ti-Al-Cr-Y粘结涂层的样品上仍然存在连续的氧化铝氧化皮，而Ti-Al-Cr-Zr层在1，000 °C下1，000次循环后严重降解并且形成厚的混合氧化皮。
Thermal barrier coatings (TBC) of yttria stabilized zirconia were deposited on the γ-TiAl based alloy Ti–45Al–8Nb (at.%) using electron-beam physical vapor deposition. The bond coats used were 10 μm thick intermetallic Ti–Al–Cr layers with additions of the reactive elements Y and Zr produced by magnetron sputtering. Cyclic oxidation tests at 900 and 1,000 °C in air revealed excellent oxidation resistance of the Ti–Al–Cr–Y bond coat associated with the precipitation of Y-rich particles in the thermally grown alumina scale as well as in the intermetallic layer. A less protective behavior was found with the zirconium containing bond coat. Lifetimes exceeding 1,000 1-h cycles were determined for both TBC systems at 900 °C. Edge chipping of the zirconia topcoat occurred at 1,000 °C. As observed by cross-sectional examination, a continuous alumina scale was still present on the samples with Ti–Al–Cr–Y bond coat, whereas the Ti–Al–Cr–Zr layer was severely degraded and a thick mixed oxide scale formed after 1,000 cycles at 1,000 °C.