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Dicplacement Behavior of Ceramic Springs

  • Due to the promising combination of chemical, thermal and mechanical properties, springs made of advanced ceramics have attracted much attention as a replacement for metal springs in highly demanding applications, operating at high temperatures and in harsh environments when hardened metals can no longer be used. A further application was recently proposed by using ceramic springs with metalized surfaces as capacitive force sensors. Prior to any design of an instrument, application-specific static and/or dynamic loading experiments are necessary to investigate the stability of spring properties under the given conditions. These experiments can also be used to determine seldom measured material properties like the shear modulus of ceramics. Helical Springs with a rectangular cross-section have been machined from straight tubes of alumina (99.99% α-AI203,) and zirconia (Y/Ce-TZP). The sintered density of both materials was above 99% of the theoretical density. The stress/displacementDue to the promising combination of chemical, thermal and mechanical properties, springs made of advanced ceramics have attracted much attention as a replacement for metal springs in highly demanding applications, operating at high temperatures and in harsh environments when hardened metals can no longer be used. A further application was recently proposed by using ceramic springs with metalized surfaces as capacitive force sensors. Prior to any design of an instrument, application-specific static and/or dynamic loading experiments are necessary to investigate the stability of spring properties under the given conditions. These experiments can also be used to determine seldom measured material properties like the shear modulus of ceramics. Helical Springs with a rectangular cross-section have been machined from straight tubes of alumina (99.99% α-AI203,) and zirconia (Y/Ce-TZP). The sintered density of both materials was above 99% of the theoretical density. The stress/displacement curves turned out to be extremely linear and the spring constants were not altered, even after more than one million cycles of compression loading at various temperatures from -15°C to +60°C. This means that such springs can be a far more reproducible and reliable source of an elastic response to applied forces than handmade springs from molten quartz wires. The behavior found for in-house fabricated springs contrasts to the behavior found for a commercial ceramic spring, which was produced by injection molding and exhibits a less linear response. Furthermore, high-temperature displacement behavior of fabricated alumina and zirconia springs was tested under static loading conditions in different atmospheres (air, N2 and H2) at temperatures up to 1000 °C.zeige mehrzeige weniger

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Metadaten
Autoren/innen:C. Paulick
Koautoren/innen:Bärbel Schulz, Mahdi Salehi, M. Feigl, Torsten Rabe
Dokumenttyp:Vortrag
Veröffentlichungsform:Präsentation
Sprache:Englisch
Jahr der Erstveröffentlichung:2017
Organisationseinheit der BAM:5 Werkstofftechnik
5 Werkstofftechnik / 5.5 Technische Keramik
DDC-Klassifikation:Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Ingenieurwissenschaften und zugeordnete Tätigkeiten
Freie Schlagwörter:Ceramic springs; High-temperature behavior; Sensor
Themenfelder/Aktivitätsfelder der BAM:Material
Material / Materialien und Stoffe
Veranstaltung:Jahrestagung der Deutschen Keramischen Gesellschaft
Veranstaltungsort:Berlin, Germany
Beginndatum der Veranstaltung:19.03.2017
Enddatum der Veranstaltung:22.03.2017
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:24.07.2017
Referierte Publikation:Nein