公开(公告)号：US20150167141A1

公开(公告)日：2015-06-18

申请号：US14107225

申请日：2013-12-16

Applicant: GENERAL ELECTRIC COMPANY

Inventor： Larry Steven ROSENZWEIG ,  James Anthony RUUD ,  Shankar SIVARAMAKRISHNAN

IPC: C23C4/12 ,  C23C4/10 ,  F01D25/00

CPC classification number: C23C4/067 ,  C23C4/134 ,  F01D5/288 ,  Y02T50/6765 ,  Y10T428/24802

Abstract: The present application provides Calcia-Magnesia-Alumina-Silica (CMAS) (or molten silicate) resistant thermal barrier coatings (TBC). The coatings include elongate growth domains of non-equiaxed, randomly arranged overlapping grains or splats. The elongate growth domains include overlapping individual, randomly distributed splats of tough and soft phases. In some embodiments, the elongate growth domains are formed via air plasma spray. In some embodiments, the tough phases are at least partially stabilized zirconia and/or hafnia compositions, and the soft phases are CMAS (or molten silicate) reactive or resistant compositions. Within each elongate growth domain, the mixture of the tough and soft phases act together to limit penetration of CMAS and also provide sufficient domain toughness to minimize cracking forces produced during crystallization of infiltrated CMAS. The soft phases may react with the CMAS and increase its melting point, increase its viscosity, and reduce the destabilization of the tough phases.

Abstract translation: 本申请提供了氧化钙 - 氧化铝 - 二氧化硅（CMAS）（或熔融硅酸盐）耐热隔热涂层（TBC）。 涂层包括非等轴，随机排列的重叠晶粒或碎片的细长生长域。 细长的生长结构域包括重叠的，随机分布的韧性和软相的碎片。 在一些实施方案中，细长生长域通过空气等离子体喷涂形成。 在一些实施方案中，韧性相是至少部分稳定的氧化锆和/或铪组合物，并且软相是CMAS（或熔融硅酸盐）反应性或抗性组合物。 在每个细长生长区域内，韧性和软相的混合物共同作用以限制CMAS的渗透，并且还提供足够的结构域韧性以最小化渗透的CMAS结晶过程中产生的开裂力。 软相可能与CMAS反应并增加其熔点，增加其粘度，并减少韧性相的不稳定性。