Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/41647

Title

Nanomaterial deposits formed by DC plasma spraying of liquid feedstocks

Author(s)

Karthikeyan, Jeganathan;  Berndt, Christopher C.;  Reddy, Sri;  Wang, Jenn Yue;  King, Alexander H.;  Herman, Herbert

Abstract

An experimental system consisting of an axial feed plasma gun, a variable-rate liquid delivery system, a liquid atomizer-feeder, and a substrate movement and control system was designed and assembled for preparing nanograined ceramic deposits. Sprayed deposits were produced with different spray and sol feed parameters and investigated in both the as-sprayed and heat-treated conditions. Assprayed deposits were predominately hydroxide phases and were strongly adherent to the substrates. Postspray heat treatment at 873 K led to conversion of the alumina and zirconia deposits to γ-alumina and tetragonal zirconia phases, respectively. Subsequent heat treatment at 1273 K resulted in densification of the deposits and formation of high-temperature phases. A small increase in the grain size was observed with heat treatment, but the specimens still retained nanosized grains.

Publication type

Journal article

Source

Journal of the American Ceramic Society, Vol. 81, no. 1 (Jan 1998), pp. 121-128

Publication year

1998

Keyword(s)

Adhesion;  Alumina;  Atomizers;  Ceramic materials;  Control systems;  Densification;  Deposits;  Feedstocks;  Heat treatment;  High temperature phase;  Hydroxide phase;  Liquid atomizer feeder;  Liquid delivery system;  Nanostructured materials;  Plasma guns;  Plasma spraying;  Zirconia

Publisher

Wiley-Blackwell Publishing

ISSN

0002-7820

Publisher URL

http://dx.doi.org/10.1002/chin.199821022

Additional information

This research was supported by the US National Science Foundation under Grant No. CTS-9312896.

Peer reviewed