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Nanomaterial Deposits Formed by DC Plasma Spraying of Liquid Feedstocks
Author(s) -
Karthikeyan Jeganathan,
Berndt Christopher C.,
Reddy Sri,
Wang JennYue,
King Alexander H.,
Herman Herbert
Publication year - 1998
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1998.tb02303.x
Subject(s) - materials science , ceramic , cubic zirconia , hydroxide , chemical engineering , substrate (aquarium) , plasma , grain size , metallurgy , nanomaterials , composite material , mineralogy , nanotechnology , chemistry , oceanography , engineering , geology , physics , quantum mechanics
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. As‐sprayed 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.