Nanocrystalline Cr2O3 and amorphous CrO3 produced by solution combustion synthesis

被引：86

作者：

Lima, MD ^{[1
]}

Bonadimann, R ^{[1
]}

de Andrade, MJ ^{[1
]}

Toniolo, JC ^{[1
]}

Bergmann, CP ^{[1
]}

机构：

[1] Univ Fed Rio Grande do Sul, Dept Mech Engn, BR-90035190 Porto Alegre, RS, Brazil

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2006年 / 26卷 / 07期

关键词：

powders-chemical preparation; grain size; wear parts; Cr2O3;

D O I：

10.1016/j.jeurceramsoc.2005.01.042

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：

The synthesis of chromium oxides by solution combustion synthesis was investigated. Ammonium dichromate, glycine, urea and ammonium nitrate dissolved in aqueous solution were used as the precursors of the oxides. The effect of different reaction parameters. such as fuel richness. stoichiometry and fuel leanness was evaluated; such parameters were modified by changing the reagents and the fuel/oxidant ratio. Amorphous CrO3 and crystalline Cr2O3 were synthesized. The results suggest that glycine is a better complexing/combustible agent for ammonium dichromate than Urea. Addition of extra ammonium nitrate to stoichiometric compositions improved the specific surface area and reduced the crystallite size. The smallest crystallite size (approximate to 20 nm) of Cr2O3 was obtained with glycine as fuel/complexant agent in fuel-lean Mixtures. The highest specific surface area (63 m(2)/g) was observed with urea in fuel-rich mixtures, forming amorphous CrO3. (c) 2005 Elsevier Ltd. All rights reserved.

引用

页码：1213 / 1220

页数：8

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