Residual Stress Assessment for Thin 8YSZ Electrolytes Using Focused Ion Beam Milling and Digital Image Correlation

Abstract

With respect to solid oxide fuel cell power density it has been verified that 1–2 μm thick 8YSZ electrolytes have significant advantages, offering the potential to operate stacks at temperatures of 600 °C. However, reliability of the component depends on integrity and hence residual stress state. In this work, an advanced method is used to determine the electrolyte residual stress locally using stress relaxation tests by a combination of focused ion beam milling and digital image correlation.

Neutron Diffraction Residual Strain Measurements of Molybdenum Carbide-Based Solid Oxide Fuel Cell Anode Layers with Metal Oxides on Hastelloy X

“…It is also known that the residual stress values of SOFC electrodes (or any other materials) are very much dependent upon the measurement method (e.g. X-ray diffraction [2,[4][5][6][7][8][9][10][11][12][13][14][15][16][17], synchrotron X-ray radiation [18][19][20][21], curvature method [15,[22][23][24][25][26], finite element [27,28], numerical [16,29], focused ion beam milling and digital image correlation [30], white light interferometry [25], nanoindentation [25,28], and neutron diffraction [31] methods). Furthermore, thermal spray deposition processes due to high cooling rates of the impacting particles (lamella) impart residual stress in the layered SOFC materials and hence influence the durability and efficiency of the cell.…”