CeO_2添加剂对等离子喷涂ZrO_2涂层抗热震性的影响

Effect of Additive CeO_2 on Thermal Shock Resistance of Plasma-Sprayed ZrO_2 Coating

摘要:

采用 SEM,EPMA和热震方法 ,研究了 Ce O2 添加剂对等离子喷涂 Zr O2 涂层抗热震性的影响。结果表明 :当 Ce O2 由 0增加到 9.0 % (质量分数 ,下同 )时 ,涂层的抗热震起裂次数和失效次数分别由 32次和 46次增加到 76次和 10 5次 ;继续增加 Ce O2 ,涂层的抗热震性能急剧下降。Zr O2 + 9.0 % Ce O2 涂层在热循环中形成的网状微裂纹 ,不仅可降低涂层中的应力 ,也可提高涂层开裂的临界温差 ,从而可改善其抗热震性能。

Abstract:

Effect of additive CeO 2 on thermal shock resistance of plasma sprayed ZrO 2 coating has been investigated using SEM, EPMA and thermal shock tests. As mass fraction of additive CeO 2 increases 0 to 9 0%, the lifetimes of fracture initiation and fracture failure increase 32 and 46 cycles to 76 and 105 cycles respectively. Net shaped microcracks well distributed in ZrO 2+9 0% CeO 2 coating resulted in decreasing stress and critical temperature of fracture initiation in coating, so the thermal shock resistance increases.