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Processing and Characterization of Beads with Graded Layer Compositions Based on Zirconia and TRIP‐Steel
Author(s) -
Oppelt Marie,
Leißner Thomas,
Berek Harry,
Baumgart Christine,
Krüger Lutz,
Peuker Urs,
Aneziris Christos G.
Publication year - 2019
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201800615
Subject(s) - materials science , cubic zirconia , coating , microstructure , composite material , layer (electronics) , metallurgy , casting , absorption (acoustics) , ceramic
A new and innovative coating process of metal matrix beads fabricated using a gel‐casting process by alginate gelation is presented. The suspensions contain austenitic stainless steel and magnesia partially stabilizes zirconia. The prepared beads are coated using two different methods − spraying and dipping. Sintered beads with the used spray coating have an adequate compressive strength (≈550 MPa), good surface quality, homogeneous microstructure, and high energy absorption capability. At lower strains (up to 20%), the spray coated beads obtain much higher specific energy absorption (SEA) in comparison to pure steel beads and in comparison to non‐coated MMC beads based on 90 vol% steel and 10 vol% zirconia: the coated beads show a significantly improved energy absorption capability with 10.7 kJ kg −1 at a strain of 20%. Pure steel only exhibits a SEA of 5.2 kJ kg −1 .