Mo基体上锆酸镧热障涂层的研究

Study on Lanthanum Zirconate Thermal Barrier Coating on Mo Substrate

摘要:

利用自行研制的La1.4Nd0.6Zr2O7（LNZ）喷涂粉末，采用大气等离子喷涂在Mo基体上制备LNZ热障涂层。测试粉末的各项热物理性能，考核涂层的抗热震性能和高温隔热性能，并与常规氧化钇稳定氧化锆（YSZ）涂层进行比较。结果表明，与YSZ相比，LNZ由于具有热膨胀系数小、导热系数低、烧结速率低等特点而更适合在Mo基体作为热障涂层使用。

Abstract:

The thermal barrier coating of La1.4Nd0.6Zr2O7(LNZ) on Mo substrate was prepared by the air plasma spraying with self-developed LNZ thermal spray powder. The thermal physical properties of LNZ powder were examined. The thermal shock resistence and thermal barrier effects of LNZ coatings were tested and compared with those of yttria stabilized zirconia(YSZ) thermal barrier coating. The results show that comparing with YSZ coating, LNZ thermal barrier coating is more suitable for Mo substrate because of its lower thermal expansion coefficient, lower thermal conductivity and sintering rate.