Thermal and microstructural analysis of doped alumina nanofibers

被引：6

作者：

Aghayan, Marina ^{[1
]}

Gasik, Michael ^{[2
]}

Hussainova, Irina ^{[1
,3
]}

Rubio-Marcos, Fernando ^{[4
]}

Kollo, Lauri ^{[1
]}

Kuebarsepp, Jakob ^{[1
]}

机构：

[1] Tallinn Univ Technol, EE-19086 Tallinn, Estonia

[2] Aalto Univ Fdn, Sch Chem, FIN-00076 Aalto, Finland

[3] ITMO Univ, St Petersburg 197101, Russia

[4] CSIC, Inst Ceram & Vidrio, ES-28049 Madrid, Spain

来源：

THERMOCHIMICA ACTA | 2015年 / 602卷

关键词：

Alumina; Thermal analysis; Nanofibers; Zirconia; Nanocomposites; BOEHMITE NANOFIBRES; GAMMA; CERAMICS;

D O I：

10.1016/j.tca.2015.01.009

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Gamma-alumina nanofibers of 7 nm in diameter and aspect ratio similar to 10(6) were doped with 10% of zirconia or alpha-alumina by in situ chemical liquid deposition (CLD) technique. Thermal behavior and decomposition kinetics of dopant nano-layers were conducted using simultaneous coupled thermal analysis (TG-DSC-FTIR) to optimize the processing conditions and suggest possible reaction mechanisms. SEM and TEM analysis of fine structure of functionalized nanofibers revealed changes in dopants localization at the base nanofibers. The effect of dopants on thermally-treated materials properties treatment was evaluated after consolidation of the samples by HIP at 1200 degrees C and 150 MPa. These sintered specimens have shown an increase in microhardness (HV) by 30% and 55% for alumina- and zirconia-doped materials, respectively. The mechanism and kinetics of the dopants precursor reactions are discussed on the basis of the simultaneous thermal analysis. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：43 / 48

页数：6

共 17 条

[1] Functionalization of gamma-alumina nanofibers by alpha-alumina via solution combustion synthesis [J].