L12 (Al,Cr)3Ti-based two-phase intermetallic compounds-II. Application to coating materials on TiAl
L12 (Al,Cr)3Ti-based two-phase intermetallic compounds-II. Application to coating materials on TiAl
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L12(Al,Cr)3Ti基两相金属间化合物-II。
DOI：
10.1016/s1359-6462(96)00459-9
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
D. Wee
中科院分区：
文献类型：
--
作者：
J. Y. Park;Seung;H. Lee;M. Oh;D. Wee
采用射频磁控溅射法在Ti-48Al试样表面镀上Al-21Ti-23Cr薄膜。等温氧化试验表明，在200 W、0.8 Pa、573 K条件下，Ti-48Al试样的抗氧化性能最好。Al-21Ti-23Cr薄膜沉积后呈非晶态，氧化过程中在表面结晶形成保护层AlzO。通过1073 K、1173 K和1273 K的等温氧化试验，研究了涂层试样在100 h下的氧化行为。等温氧化曲线表明，在所有测试温度范围内，抛物线阶段都持续到100 h，这是由于Al-21Ti-23Cr膜表面形成了一层保护层AlzO3。经过1273K氧化试验后，Al- 21ti - 23cr膜由于氧化过程中Al的耗损和基体中Ti的扩散，基体转变为TiAlCr相，试样的质量增加程度较低温下试样有所增加。
Ti-48Al specimens were coated with Al-21Ti-23Cr film by RF magnetron sputtering. Ti-48Al specimen coated at 200 W, 0.8 Pa and 573 K showed the best oxidation-resistant property in the isothermal oxidation test. Al-21Ti-23Cr film was amorphous after deposition, but crystallized and formed a protective AlzO, layer on the surface during oxidation. The oxidation behavior of the coated specimens has been investigated through isothermal oxidation tests at 1073 K, 1173 K and 1273 K for 100 h. The isothermal oxidation curves showed that the parabolic stage continued up to 100 h at all tested temperature ranges, and the excellent oxidation resistance is attributable to the formation of a protective AlzO3 layer on the surface of the Al-21Ti-23Cr film. After the oxidation test at 1273K, the matrix of the Al-21Ti-23Cr film had transformed into the TiAlCr phase due to the depletion of Al during oxidation and the diffusion of Ti from the substrate, and the extent of mass gain of the specimen increased compared with that of specimens tested at lower temperatures.