Effect of APS flash bond coatings and curvature on TBC performance on rod specimens

被引：9

作者：

Lance, M. J. ^{[1
]}

Thiesing, B. P. ^{[2
]}

Haynes, J. A. ^{[1
]}

Gildersleeve, E. J. ^{[3
]}

Sampath, S. ^{[3
]}

Pint, B. A. ^{[1
]}

机构：

[1] Oak Ridge Natl Lab, 1 Bethel Valley Rd, Oak Ridge, TN 37831 USA

[2] No Arizona Univ, POB 4185, Flagstaff, AZ 86011 USA

[3] SUNY Stony Brook, 100 Nicolls Rd, Stony Brook, NY 11794 USA

来源：

SURFACE & COATINGS TECHNOLOGY | 2019年 / 378卷

关键词：

Photo-stimulated luminescence piezospectroscopy (PLPS); Furnace cycle testing (FCT); APS flash bond coating; Alumina scale; TBC; HVOF bond coating; VPS bond coating; THERMAL BARRIER COATINGS; CREEP RESISTANCE; ALUMINA SCALES; OXIDATION; LIFETIME; STRESS; ROUGHNESS; FAILURE;

D O I：

10.1016/j.surfcoat.2019.124940

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The addition of an air plasma sprayed (APS) "flash" bond coating layer on top of a high velocity oxy-fuel (HVOF) bond coating significantly extended the lifetime of APS yttria stabilized zirconia (YSZ) thermal barrier coatings (TBC) on rod specimens of superalloy 247 tested using 100-h cycles in air +10%H2O at 1100 degrees C. The flash bond coatings of both NiCoCrAlY and NiCoCrAlYHfSi powder were compared to an HVOF-only and a vacuum plasma sprayed (VPS) NiCoCrAlYHfSi bond coating. The flash coatings appear to form a mixed oxide-metal zone, which likely inhibits crack formation and therefore extends lifetime compared to conventional bond coatings. The underlying dense HVOF layer appeared to act as a source of Al for this intermixed zone and prevented the oxide from penetrating deeper into the bond coating. Residual stress in the thermally-grown Al2O2 scale was measured using photo-luminescence piezospectroscopy (PLPS) as a function of time for each coating variation, including a comparison of concave and convex surfaces on a specially designed rod.

引用

页数：7

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