LaTi2Al9O19 (LTA ) 作为新有点热的障碍涂层(TBC ) 展出有希望的潜力材料,由于它的优秀高温度的能力和低热电导率。在这份报纸, LTA/yttria 稳定了氧化锆(YSZ ) TBC 被大气的血浆喷洒生产。热腐蚀行为和涂层的相关失败机制被调查。LTA 的分解不甚至在 1 458 个热腐蚀周期以后发生在 1 373 K,揭示在 Na2SO4 和 NaCl 的熔融的盐的好化学稳定性。然而,熔融的盐渗透到契约上衣,引起在熔融的盐和契约上衣的热腐蚀的热地成年的氧化物(TGO ) 溶解。作为结果, TBC 裂开发生在氧化物层以内。在结论,陶器的材料 LTA 和 YSZ 表明在 Na2SO4 和 NaCl 的熔融的盐的好化学稳定性,和契约上衣在在 LTA/YSZ TBC 对热腐蚀为部件提供保护起一个重要作用。LTA 作为新奇 TBC 材料展出很有希望的潜力。
LaTi2Al9O19 (LTA) exhibits promising potential as a new kind of thermal barrier coating (TBC) material, due to its excellent high-temperature capability and low thermal conductivity. In this paper, LTA/yttria stabilized zirconia (YSZ) TBCs are produced by atmospheric plasma spraying. Hot corrosion behavior and the related failure mechanism of the coating are investigated. Decomposition of LTA does not occur even after 1 458 hot corrosion cycles at 1 373 K, revealing good chemical stability in molten salt of Na=SO4 and NaCl. However, the molten salt infiltrates to the bond coat, causing dissolving of the thermally grown oxide (TGO) in the molten salt and hot corrosion of the bond coat. As a result, cracking of the TBC occurs within the oxide layer. In conclusion, the ceramic materials LTA and YSZ reveal good chemical stability in molten salts of Na2SO4 and NaCl, and the bond coat plays a significant role in providing protection for the component against hot corrosion in the LTA/YSZ TBCs. LTA exhibits very promising potential as a novel TBC material.