Carbon fibre spring for high-temperature application

Buhl, H.; Weiß, Roland

doi:10.1016/0022-0248(93)90198-6

Cited by 6 publications

(2 citation statements)

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“…Ceramic springs can be used at temperatures up to about 1000 • C, as shown for springs made of alumina 1 and silicon nitride. 2 Decisive relays, 5 in semiconductor production, [6][7][8] and in magnetic resonance imaging scanners. In recent years, the increase of efficiency in mechanical systems has become more important, and this has led to a demand for springs with smaller energy losses in the application.…”

Section: Introductionmentioning

confidence: 99%

“…Grujicic 3 identified ceramic matrix composites as particularly suitable for clamping springs in industrial gas turbine engines. Furthermore, ceramic springs have been tested and used so far, for example, as valve springs, 4 as high‐temperature components in vacuum tubes and relays, 5 in semiconductor production, 6–8 and in magnetic resonance imaging scanners. In recent years, the increase of efficiency in mechanical systems has become more important, and this has led to a demand for springs with smaller energy losses in the application 9 .…”

Section: Introductionmentioning

confidence: 99%

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Manufacturing and deformation behavior of alumina and zirconia helical springs at room temperature

2023

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Ceramic helical springs with identical dimensions were produced by hard machining from alumina, alumina toughened zirconia (ATZ), and tetragonal zirconia polycrystals (TZP) stabilized with different oxides. According to the results of the spring constant determination under deformation rates of 3 mm/min, the deformation behavior of all ceramic springs obeys to Hook's law. However, variation of the deformation rate, tests under constant load, and spring recovery behavior revealed differences in the deformation behavior of alumina, TZP, and ATZ springs. Alumina springs exhibited time-independent deformation in all tests. In contrast, anelastic deformation at room temperature was demonstrated in all springs containing TZP. This deformation is completely reversible over a period of several days. Anelastic behavior is particularly pronounced in Y-TZP springs, whereas Ce-TZP springs exhibit comparatively very low but still reliably detectable anelasticity. Oxygen vacancies in the TZP ceramic are considered the most likely explanation for the anelastic behavior of TZP springs at room temperature.

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