CrON扩散阻挡层对NbCrAl涂层与Nb基高温合金元素互扩散的影响

doi:10.7527/S1000-6893.2015.0043

Abstract

Abstract:

NbCrAl coatings with and without CrON diffusion barrier (DB) are prepared on C103 Nb-based superalloy by magnetron sputtering technique. The element diffusion behavior of two kinds of the coatings during vacuum heat treatment at 900℃ and 1000℃ is investigated. The results indicate that the as-deposited NbCrAl coating is composed of Cr₂Nb and AlNb₂ with amorphous phases. After vacuum heat treatment, NbAl₃ and (Nb,Cr) precipitated phases are formed. When the heat treatment temperature is increased to 1000℃ from 900℃, the rate of diffusion of elements in the NbCrAl coating becomes accelerated. Cr and Al elements in the samples without a DB diffuse to C103 substrate are 2.76wt% and 1.21wt%, while in the samples with a DB are only 2.52wt% and 0.84wt%. CrON diffusion barrier maintains continuous and has good adhesion to the coating and substrate as well. During high-temperature treatment, the CrON diffusion barrier, which is mainly composed of Cr₂O₃ and Al₂O₃ phases with close-packed hexagonal structure phases, effectively suppresses the elements inter-diffusion between the coating and substrate.

Key words: magnetron sputtering, coating, Nb-based superalloy, diffusion barrier, inter-diffusion

CLC Number:

XU An, ZHOU Min, YANG Yang, QIN Zehua, LI Weizhou. Influence of CrON diffusion barrier on elements inter-diffusion between NbCrAl coating and Nb-based superalloy[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2015, 36(11): 3734-3741.

References

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Influence of CrON diffusion barrier on elements inter-diffusion between NbCrAl coating and Nb-based superalloy

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