Journal Article

PreJuSER-19834

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Mechanical properties of thermally sprayed Fe based coatings

Röttger, A.FZJ* ; Weber, S.FZJ* ; Theisen, W.FZJ* ; Rajasekeran, B.FZJ* ; Vassen, R.FZJ*

2011
Maney Publishing London [u.a.]

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Please use a persistent id in citations: doi:10.1179/1743284710Y.0000000002

Abstract: The synthetic vanadinites (Pb(x)Ca(10-x))(VO4)6F2delta, 1 < x < 9, adopt a P6(3)/m apatite structure with 9.7590 (1) < or = a < or = 10.1179 (1) A and 7.0434 (3) < or = c < or = 7.4021 (1) A. The partitioning of calcium and lead over the AI(4f) and AII(6h) positions is nonstoichiometric with lead preferentially entering the larger AII site. High-resolution electron microscopy showed that samples annealed for 10 h at 1073 K are in disequilibrium with calcium- and lead-rich microdomains co-existing at unit-cell scales. For (Pb5Ca5)(VO4)6F2delta, sintering in excess of 2 weeks is required for the metals to order macroscopically. As annealing progresses, c/a, the partitioning coefficient kPb(AI/AII) and the AIO6 metaprism twist angle (phi) adjust cooperatively to enlarge the apatite channel, and thereby accommodate higher lead content. These results demonstrate that phi is a sensitive measure of disequilibrium and a useful device for monitoring changes in apatite topology as a function of composition.

Keyword(s): J ; HVOF (auto) ; Tool steel (auto) ; Wear resistance (auto) ; Mechanical properties (auto) ; Thermal spraying (auto) ; Review (auto)

Note: The authors gratefully acknowledge financial support by the Deutsche Forschungsgemeinschaft within the project 'Thermisches Spritzen von Fe-Basis MMC' (DFG project no. TH531/6-1; VA163/4-1).

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Contributing Institute(s):

1. Werkstoffsynthese und Herstellverfahren (IEK-1)

Research Program(s):

1. Rationelle Energieumwandlung (P12)

Appears in the scientific report 2011

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