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The dissociation of NZP (Ca_(0.5)Sr_(0.5)Zr_4P_6O_(24)) during plasma spraying during plasma spraying

Trice, Rodney W. and Brewer, Luke N. and Faber, K. T. (2000) The dissociation of NZP (Ca_(0.5)Sr_(0.5)Zr_4P_6O_(24)) during plasma spraying during plasma spraying. Scripta Materialia, 42 (9). pp. 855-860. ISSN 1359-6462.

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Sodium zirconium phosphate (NaZr_2P_3O_(12) or NZP) was first systematically evaluated in the early 1980s by Roy and co–workers, who demonstrated its extremely low coefficient of thermal expansion (CTE). It was later shown that other group IA and IIA atoms can be ionically substituted into the NZP crystal structure to adjust the CTE. As a result of their low and tailorable CTEs, NZP’s have potential use as a protective coating for silicon–based ceramics and carbon–carbon composites. One technique for the application of ceramic coatings employs plasma–spraying. In this process, powders are injected into a plasma flame, melted, and propelled onto a substrate. The resulting coating microstructure is typically composed of thin lamellae (from each melted particle) stacked on top of one another during each pass of the torch. In the current research, NZP has been plasma–sprayed using the recently patented small particle plasma–spray process. The microstructure was then analyzed using transmission electron microscopy and x–ray diffraction to identify the phases in the complex coating that resulted.

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Faber, K. T.0000-0001-6585-2536
Alternate Title:The dissociation of NZP (Ca0.5Sr0.5Zr4P6O24) during plasma spraying during plasma spraying
Additional Information:Copyright © 2000 Acta Metallurgica Inc. Published by Elsevier. (Received July 26, 1999) (Accepted in revised form December 16, 1999). The authors gratefully acknowledge the financial support of the U.S. Department of Energy, Federal Energy Technology Center, Cooperative Agreement No. DE-FC21-92MC29061, subcontract 96-01–SR047, the National Science Foundation, contract No. DMR-9974013, and the Department of Defense NDSEG Fellowship. The authors also wish to thank Rick Marzec for assistance during plasma–spraying and Tom Easley for helpful comments while preparing the manuscript.
Funding AgencyGrant Number
Department of Energy (DOE)DE-FC21-92MC29061
National Defense Science and Engineering Graduate (NDSEG) FellowshipUNSPECIFIED
Subject Keywords:Plasma spray; TEM; NZP
Issue or Number:9
Record Number:CaltechAUTHORS:20140908-181323960
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Official Citation:Rodney W. Trice, Luke N. Brewer, K.T. Faber, The dissociation of NZP (Ca0.5Sr0.5Zr4P6O24) during plasma spraying, Scripta Materialia, Volume 42, Issue 9, 14 April 2000, Pages 855-860, ISSN 1359-6462, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49398
Deposited By: George Porter
Deposited On:09 Sep 2014 20:15
Last Modified:03 Mar 2020 13:01

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