Abstract
The objective was to design, fabricate and test a neutron diffraction equipment for measurements of internal stresses in SOFC components with high spatial resolution, and use the best suited equipment to measure internal stresses in SOFC components from other participants in the programme. Two different geometries and two different materials (Al{sub 2}O{sub x} and YSZ) were examined in order to investigate: the diffracted intensity as related to the diffracting volume, the diffracted intensity as related to the position of the sample relative to the slit arrangement, and the accuracy of the strain measurement. It was found that the beam collimation by two pairs of double slits increases and the diffraction efficiency decreases with decreased slit width, the diffracting volume is fairly well defined by the two pairs of double slits, and the accuracy in the determination of the internal stresses is adequate. With the equipment for high spatial resolution it is possible to measure lattice spacing in volumes of YSZ down to 1-10 mm{sup 3}. Residual strains were measured for NiO, LSM and YSZ of a planar Risoe 3-layer cell (anode NiO/YSZ, electrode YSZ, cathode LMS/YSZ). Each layer was 42 by 42 by 0.1 mm. Slit widths from 10 to
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Citation Formats
Toftegaard, H, Leffers, T, and Poulsen, F W.
Risoe activity within the CEC SOFC programme: Measurement of internal stresses by neutron diffraction.
Denmark: N. p.,
1991.
Web.
Toftegaard, H, Leffers, T, & Poulsen, F W.
Risoe activity within the CEC SOFC programme: Measurement of internal stresses by neutron diffraction.
Denmark.
Toftegaard, H, Leffers, T, and Poulsen, F W.
1991.
"Risoe activity within the CEC SOFC programme: Measurement of internal stresses by neutron diffraction."
Denmark.
@misc{etde_10142416,
title = {Risoe activity within the CEC SOFC programme: Measurement of internal stresses by neutron diffraction}
author = {Toftegaard, H, Leffers, T, and Poulsen, F W}
abstractNote = {The objective was to design, fabricate and test a neutron diffraction equipment for measurements of internal stresses in SOFC components with high spatial resolution, and use the best suited equipment to measure internal stresses in SOFC components from other participants in the programme. Two different geometries and two different materials (Al{sub 2}O{sub x} and YSZ) were examined in order to investigate: the diffracted intensity as related to the diffracting volume, the diffracted intensity as related to the position of the sample relative to the slit arrangement, and the accuracy of the strain measurement. It was found that the beam collimation by two pairs of double slits increases and the diffraction efficiency decreases with decreased slit width, the diffracting volume is fairly well defined by the two pairs of double slits, and the accuracy in the determination of the internal stresses is adequate. With the equipment for high spatial resolution it is possible to measure lattice spacing in volumes of YSZ down to 1-10 mm{sup 3}. Residual strains were measured for NiO, LSM and YSZ of a planar Risoe 3-layer cell (anode NiO/YSZ, electrode YSZ, cathode LMS/YSZ). Each layer was 42 by 42 by 0.1 mm. Slit widths from 10 to 20 mm were used. The best suited equipment was a combination of Soller slits (thin, neutron absorbing, parallel plates) and a double slit for both the incident and the diffracted beam. The measured residual strains for the components of the cell are: 300x10{sup -6} (tension) for NiO, 700x10{sup -6} (tension) for LSM and less than 450x10{sup -6} (compression) for YSZ. (AB).}
place = {Denmark}
year = {1991}
month = {Oct}
}
title = {Risoe activity within the CEC SOFC programme: Measurement of internal stresses by neutron diffraction}
author = {Toftegaard, H, Leffers, T, and Poulsen, F W}
abstractNote = {The objective was to design, fabricate and test a neutron diffraction equipment for measurements of internal stresses in SOFC components with high spatial resolution, and use the best suited equipment to measure internal stresses in SOFC components from other participants in the programme. Two different geometries and two different materials (Al{sub 2}O{sub x} and YSZ) were examined in order to investigate: the diffracted intensity as related to the diffracting volume, the diffracted intensity as related to the position of the sample relative to the slit arrangement, and the accuracy of the strain measurement. It was found that the beam collimation by two pairs of double slits increases and the diffraction efficiency decreases with decreased slit width, the diffracting volume is fairly well defined by the two pairs of double slits, and the accuracy in the determination of the internal stresses is adequate. With the equipment for high spatial resolution it is possible to measure lattice spacing in volumes of YSZ down to 1-10 mm{sup 3}. Residual strains were measured for NiO, LSM and YSZ of a planar Risoe 3-layer cell (anode NiO/YSZ, electrode YSZ, cathode LMS/YSZ). Each layer was 42 by 42 by 0.1 mm. Slit widths from 10 to 20 mm were used. The best suited equipment was a combination of Soller slits (thin, neutron absorbing, parallel plates) and a double slit for both the incident and the diffracted beam. The measured residual strains for the components of the cell are: 300x10{sup -6} (tension) for NiO, 700x10{sup -6} (tension) for LSM and less than 450x10{sup -6} (compression) for YSZ. (AB).}
place = {Denmark}
year = {1991}
month = {Oct}
}