Phase evolution in plasma sprayed Nb2O5 coatings

被引：10

作者：

Caliari, Felipe R. ^{[1
]}

Garcia, Eugenio ^{[1
]}

Miranda, Felipe ^{[2
]}

Filho, Gilberto Petraconi ^{[2
]}

Sampath, Sanjay ^{[1
]}

机构：

[1] SUNY Stony Brook, Ctr Thermal Spray Res, Heavy Engn Bldg,Rm 130, Stony Brook, NY 11794 USA

[2] Technol Inst Aeronaut ITA DCTA, Plasma & Proc Lab LPP, BR-12228900 Sao Jose Dos Campos, SP, Brazil

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2021年 / 41卷 / 10期

关键词：

Niobium oxide; Nonstoichiometry effect; Metastable phases; Plasma spray; NIOBIUM; DEFECTS; MICROSTRUCTURE; STOICHIOMETRY; STABILITY; SYSTEM; OXIDES; BRONZE; RAMAN; NBO2;

D O I：

10.1016/j.jeurceramsoc.2021.04.022

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Nb2O5 polymorphism and defect chemistry depend on the temperature, pressure, atmosphere composition and the initial crystallography. Plasma spray of Nb2O5 is a pathway to form coatings with in-situ metastable and nonstoichiometric phases, however so far unexplored. This study aimed to understand the phase evolution of plasma sprayed Nb2O5 coatings, and its effect on their morphology and properties. Phase evolution from HNb2O5 in the feedstock, to T-Nb2O5, TT-Nb2O5, N-Nb2O5, H-Nb2O5, Nb12O29 and NbO2 in the coatings depends on the plasma Ar/H2 ratio and its related enthalpy. The microstructure shows a layered distribution of nonstoichiometric phases at the splat boundaries and splat cores composed of T-Nb2O5 or TT-Nb2O5. The presence and distribution of these phases are related to the thermomechanical and electrical properties. The mechanisms driving the formation of these coatings are based on the Nb2O5 incongruent vaporization which promote retention of nonstoichiometric phases and the rapid solidification of metastable phases.

引用

页码：5248 / 5257

页数：10

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