Residual Stress Measurement of a Single-step Sintered Planar Anode Supported SC-SOFC Using Fluorescence Spectroscopy

Abstract

The fluorescence spectroscopy technique was used to measure the residual stress between the cathode and electrolyte of an anode supported planar single-chamber solid oxide fuel cell. The cell was made of (NiO-CGO) :(CGO) :(LSCF-CGO), as anode:electrolyte:cathode and the test was carried out after sintering at room temperature. The measured stress between these layers arises from the sintering stress caused by differential shrinkage from layers during sintering and the thermal expansion co-efficient mismatch between the layers during cooling. Therefore, the residual stress in the cathode and electrolyte layer of the cell due to co-efficient of thermal expansion mismatch during cooling was calculated analytically so as to find sintering stress. According to findings a maximum compressive residual stress of -1084 MPa occurred at the place contiguous to electrolyte layer. The estimated residual stresses in the cell’s cathode and electrolyte layer owing to CTE mismatch for the duration of cooling was calculated as -324 MPa and 15.96 MPa, respectfully. Furthermore, total mean residual compressive stress between cathode and electrolyte was obtained from fluorescence spectroscopy as -703.795. Thus, the main contribution of this residual stress is the stress growth during sintering (-395.755 MPa) due to different shrinkage behavior of adjacent layers.

Investigation of ZrO2-Y2O3 Added Al Matrix Composites Produced By T/M Method

“…Microhardness values of 18.4 HV in the sample obtained by adding 5% ZrO2-Y2O3 powder into Al+5% Cu powder, 21.5 HV in the sample obtained by adding 10% ZrO2-Y2O3 powder into Al+5% Cu powder, and 22.5 HV in the sample obtained by adding 15% ZrO2-Y2O3 powder into Al+5% Cu powder were measured. With the addition of ZrO2-Y2O3 powder, the number of pores in the microstructure increased in comparison to the sample without ZrO2-Y2O3 powder, as can be seen in the microstructure photographs in Figures 3,5,6,7. While the microhardness value was expected to increase with the addition of the ZrO2-Y2O3 oxide compound, the microhardness value decreased generally due to the increase in the pore amount. However, a small increase in the microhardness value was observed as the amount of added ZrO2-Y2O3 powder increased to 15% (see Fig.…”

“…This process is also known as the sintering process. The powder metallurgy process is most affected by the compaction pressure, holding temperature, and time parameters [4], [5], [6].…”

Commercial Lighting Design in Human-Centered Lighting Concept

“…Artificial lighting systems can be useful in environments where daylight is not sufficiently utilized. By controlling the light intensity, optimum illumination can be made according to the hours [20][21][22][23][24][25][26].…”

“…They differ in the same environment. For example, if the illuminance level meter is towards light sources, from horizontal (close to the line of sight) ) high values will be read [20][21][22][23][24][25][26].…”

Investigation of The Effect of Cr2O3 Particles on Al-Si Matrix Composites Produced by Powder Metallurgy

“…With this method, composite materials can be produced with the addition of reinforcing particles into the metal matrix that can be heat treated with high strength [6,7]. Powder metallurgy technique requires a series of processes such as mixing, pressing and sintering of pre-alloyed or pre-mixed powders [8,9,10].…”