Ti ${_2}$ AlC与Cr ${_2}$ AlC对镍基高温合金的连接及抗氧化性能
Bonding and oxidation protection of Ti${_2}$AlC and Cr${_2}$AlC for a Ni-based Superalloy
摘要：
氧化铝形成、氧化和耐热冲击MAX相对于高温应用具有高度的兴趣。在这里，我们报告，镍基高温合金，NSA，和两个氧化铝形成MAX相之间的键合和相互作用。组装扩散偶Cr ${_2}$ AlC/Inconel-718/Ti ${_2}$ AlC，并在真空热压机中在对应于2 MPa或20 MPa应力的载荷下加热至1000或1100 ℃。使用X-射线衍射，扫描电子显微镜和能量色散X-射线光谱检查所得的接口。Cr ${_2}$ AlC和NSA之间的良好结合在1000°C和仅2 MPa的接触压力下热压后实现;在Ti ${_2}$ AlC的情况下，需要更高的温度（1100°C）和压力（20 MPa）。在这两种情况下，实现了扩散结合，冷却至室温后没有界面损伤或开裂的迹象。从室温到1000°C的20次热循环表明，Ti ${_2}$ AlC对Inconel-718的氧化阻挡性较差。然而，在Cr ${_2}$ AlC的情况下，没有观察到裂纹、分层或表面降解，表明该材料可用于保护Inconel-718免受氧化。
英文摘要：
Alumina forming, oxidation and thermal shock resistant MAX phases are of a high interest for high temperature applications. Herein we report, on bonding and resulting interactions between a Ni-based superalloy, NSA, and two alumina forming MAX phases. The diffusion couples Cr${_2}$AlC/Inconel-718/Ti${_2}$AlC were assembled and heated to 1000 or 1100°C in a vacuum hot press under loads corresponding to stresses of either 2 MPa or 20 MPa. The resulting interfaces were examined using X-ray diffraction, scanning electron microscopy and energy-dispersive X-ray spectroscopy. Good bonding between Cr${_2}$AlC and NSA was achieved after hot pressing at 1000°C and a contact pressure of only 2 MPa; in the case of Ti${_2}$AlC a higher temperature (1100°C) and pressure (20 MPa) were needed. In both cases, a diffusion bond was realized with no evidence of interfacial damage or cracking after cooling to room temperature. Twenty thermal cycles from room temperature to 1000°C showed that Ti${_2}$AlC is a poor oxidation barrier for Inconel-718. However, in the case of Cr${_2}$AlC no cracks, delamination nor surface degradation were observed, suggesting that this material could be used to protect Inconel-718 from oxidation.
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