To develop a nondestructive analytical method for identifying internal α-Al₂O₃ scales formed in heat-resistant alloys, the maximum thickness of surface Cr₂O₃ scales for identifying internal α-Al₂O₃ scales via cathodoluminescence (CL) spectroscopy was estimated using integral intensity of CL peak at 695 nm (R₁-R₂ doublet) for Cr₂O₃ film-deposited sapphires and α-Al₂O₃ scales formed on the surface of Fe-Cr-Al alloys. The estimated maximum Cr₂O₃ thickness was validated by measuring the intensities of the R₁-R₂ doublet for Ni-25Cr-5Al alloys heated at 1000 °C under oxygen. Therefore, internal α-Al₂O₃ scales can be identified nondestructively by acquiring the surface CL spectra up to ~ 3-µm surface Cr₂O₃ thickness.

开发内部α-Al的无损分析方法₂O₃₂厚度。₃O₂鳞片通过获取高达〜 3-μm表面Cr的表面CL光谱₃O₂ Ni-25Cr-5Al 合金在氧气下加热至 1000 °C 时的双峰。因此，可以无损识别内部α-Al₂R-₁R 厚度₃O₂铁铬铝合金表面形成的氧化皮。通过测量强度来验证估计的最大 Cr₃O₂ 薄膜沉积蓝宝石和 α-Al₃O双峰）Cr₂R-₁R 使用 695 nm 处 CL 峰的积分强度估算通过阴极发光 (CL) 光谱的尺度 (₃O₂用于识别内部α-Al的量表₃ O₂耐热合金中形成的氧化皮，表面最大厚度Cr