Oxidation behaviour of an intermetallic Ti–Al–Cr–Zr bond coat on a γ–TiAl based TNB alloy with 7YSZ thermal barrier coating
Oxidation behaviour of an intermetallic Ti–Al–Cr–Zr bond coat on a γ–TiAl based TNB alloy with 7YSZ thermal barrier coating
复制标题
具有 7YSZ 热障涂层的 γTiAl 基 TNB 合金上金属间 TiâAlâCrâZr 粘结层的氧化行为
DOI：
10.1080/09603409.2017.1404691
复制
发表时间：
2018
影响因子：
1.3
通讯作者：
R. Braun
中科院分区：
文献类型：
--
作者：
N. Laska;P. Watermeyer;L. Koliotassis;R. Braun
金属间钛铝合金是一种极具吸引力的轻质材料，可用于汽车和航空发动机的高温应用。在过去的几十年里，γ- tial合金的发展已经成功地应用于低压涡轮叶片的商业应用。γ- tial基合金的工作温度受到高温下强度和抗蠕变性能下降以及800℃以上氧化性能差的限制。由于在不损害其机械性能的情况下改善γ- tial基合金的氧化行为是一个主要挑战，金属间保护涂层在过去几年中引起了越来越多的兴趣。在本研究中，制备了一种10 μm厚的Ti-46Al-36Cr-4Zr (In。采用磁控溅射技术在TNB合金表面镀上-%)涂层。该层在高达1000°C的温度下提供出色的氧化保护。利用扫描电镜和透射电镜对该涂层在高温下的微观结构变化进行了广泛的研究。镀层呈现六方laves相Ti(Cr,Al)2、四方Cr2Al相和立方τ- tial3相组成的三相显微结构。长期暴露后，三相微观结构转变为六方α - 2- ti3al相和正交体心相的两相微观结构，其晶体结构尚未明确。在涂层上，形成了一层薄薄的氧化铝保护层。将该金属间层作为结合层，利用电子束物理气相沉积技术在γ- tial基TNB样品上沉积了部分稳定氧化钇热障涂层。循环氧化测试（在高温下1小时，在室温下冷却10分钟）的结果显示，在1000℃的空气中循环暴露的TBC寿命超过1000小时。陶瓷面漆对含有细小zro2沉淀的热生长氧化铝层具有良好的附着力。
Intermetallic titanium aluminide alloys are attractive light-weight materials for high temperature applications in automotive and aero engines. The development ofγ-TiAl alloys over the past decades has led to their successful commercial application as low pressure turbine blades. The operating temperatures ofγ-TiAl based alloys are limited by deterioration in strength and creep resistance at elevated temperatures as well as poor oxidation behaviour above 800 °C. Since improvement in oxidation behaviour ofγ-TiAl based alloys without impairing their mechanical properties represents a major challenge, intermetallic protective coatings have aroused increasing interest in the last years.In this work, a 10 μm thick intermetallic Ti–46Al–36Cr–4Zr (in at.-%) coating was applied on a TNB alloy using magnetron sputtering. This layer provided excellent oxidation protection up to 1000 °C. Microstructural changes in this coating during the high temperature exposure were extensively investigated using scanning and transmission electron microscopy. The coating developed a three-phase microstructure consisting of the hexagonal Laves-phase Ti(Cr,Al)2, the tetragonal Cr2Al phase and the cubicτ-TiAl3phase. After long-term exposure the three-phase microstructure changed to a two-phase microstructure of the hexagonalα2-Ti3Al phase and an orthorhombic body-centred phase, whose crystal structure has not yet been definitely identified. On the coating, a thin protective alumina scale formed. Applying this intermetallic layer as bond coat, thermal barrier coatings (TBCs) of yttria partially stabilized zirconia were deposited onγ-TiAl based TNB samples using electron-beam physical vapour deposition. The results of cyclic oxidation testing (1 h at elevated temperature, 10 min. cooling at ambient temperature) revealed a TBC lifetime of more than 1000 h of cyclic exposure to air at 1000 °C. The ceramic topcoat exhibited an excellent adhesion to the thermally grown alumina scale which contained fine ZrO2precipitates.
登录
查看更多内容
Zr添加对L12基Al-Ti-Cr合金相稳定性的影响
DOI：
--
发表时间：
2005
期刊：
影响因子：
--
作者：
D. Chun;Jeongyong Lee;M. Oh;D. Wee
通讯作者：
D. Wee
Al-Ti-Cr 系 L12 基合金的相稳定性
影响因子：
4.4
作者：
June M L Lee;M. Oh;M. Oh;D. Wee
通讯作者：
D. Wee
影响因子：
2.2
作者：
N. Laska;R. Braun
通讯作者：
N. Laska;R. Braun
四元 L12 三铝化物 AlTiMnMo 的固溶极限和选定的机械性能
DOI：
--
发表时间：
1994
期刊：
影响因子：
--
作者：
J. Schneibel
通讯作者：
J. Schneibel
Ti-Al-Cr-Zr金属间化合物涂层对γ-TiAl合金的氧化防护
DOI：
--
发表时间：
2013
期刊：
影响因子：
--
作者：
R. Braun;K. Kelm;A. Ehiasarian;P. Hovsepian
通讯作者：
P. Hovsepian