《Table 2 Chemical composition of points 1 and 2 marked in Fig.3 obtained by EDS (at%)》

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《ZrO_2(ZrB_2)活性扩散障界面演变行为的研究（英文）》

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Further investigation with EDS point scanning analysis of the Zr-rich layer（the interlayer in the active diffusion barrier structure）of the two coating systems（see Table 2）shows that，the Ni，Cr，Al atom contents in the Zr-rich layer of the N5/Zr O2/Ni Cr Al system are higher than those in the Zr-rich layer of the N5/BDSZ/Ni Cr Al system，indicating that more substances with Ni，Cr，Al phases are formed around the Zr-rich layer of the N5/Zr O2/Ni Cr Al system.The formed substances primarily consist of Al2O3，oxygen-deficient zirconia and mixed phases of Ni and Cr.With the increase of high-temperature oxidation time，the presence of Ni and Cr mixed phase will lead to the volume expansion of the interfacial of Al2O3/Zr-rich layer，the increase in stress and eventually the formation of cracks.Therefore，in terms of the N5/Zr O2/Ni Cr Al system，once cracks appear，they will expand rapidly and result in interfacial fracture，since the formed\""sandwich\""active diffusion barrier is primarily composed of ceramic phases.In terms of the N5/BDSZ/Ni Cr Al system，although mixed phase is also formed in the Al2O3/Zr-rich layer/Al2O3\""sandwich\""structure，the presence of Zr B2 will play the role of dispersion strengthening，which can increase the toughness of such a\""sandwich\""structure，and prevent the generation and expansion of cracks，thereby increasing the high-temperature service life of the active diffusion barrier structure.