Polymer-Derived Ceramic Coil Springs

Sofia Loginkin, Lorenz Schlier, Joseph Harris, Nahum Travitzky, Peter Greil

Research output: Contribution to journalArticlepeer-review

Abstract

Polymer-derived ceramic coil springs were manufactured by thermoplastic coiling of extruded filaments. Feedstocks for extrusion were processed from polymethylsilsesquioxane loaded with 34 vol% FeSiCr (reactive filler) and 16 vol% Si3N4 (inert filler). The pyrolytic conversion into a composite residue, the surface reactions, and the mechanical properties were analyzed. Annealing the extruded spring preforms in a reactive nitrogen atmosphere at 1300°C resulted in the formation of a surface reaction zone with a thickness <10 μm where nitridation reaction products are likely to heal cracks and pores. The as-pyrolyzed ceramic springs (without surface machining) were loaded in compression. Ceramic coil springs with a filament diameter of 2.5 mm were characterized by a spring constant of 14.3 N mm-1 and attained a fracture stress of 187 ± 40 MPa.

Original languageEnglish
Pages (from-to)70-75
Number of pages6
JournalAdvanced Engineering Materials
Volume18
Issue number1
DOIs
Publication statusPublished - 1 Jan 2016

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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