Low-temperature synthesis of AlN powder with multicomponent additive systems by carbothermal reduction-nitridation method

被引：57

作者：

Molisani, Andre Luiz ^{[1
]}

Yoshimura, Humberto Naoyuki ^{[1
]}

机构：

[1] Fed Univ ABC, Ctr Engn Modeling & Appl Social Sci, BR-09210170 Santo Andre, SP, Brazil

来源：

MATERIALS RESEARCH BULLETIN | 2010年 / 45卷 / 06期

基金：

巴西圣保罗研究基金会;

关键词：

Ceramics; Nitrides; Chemical synthesis; X-ray diffraction; Microstructure; ALUMINUM NITRIDE; THERMAL-CONDUCTIVITY; AIN POWDER; CERAMICS; AL2O3; Y2O3; CARBON; DENSIFICATION; ATMOSPHERE; MECHANISM;

D O I：

10.1016/j.materresbull.2010.02.012

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

AlN powders were synthesized at low temperatures (1300 and 1400 degrees C) by the carbothermal reduction-nitridation (CRN) method using multicomponent additive systems. The synthesis treatments were conducted in a graphite furnace with flowing nitrogen gas between 1200 and 1500 degrees C using powder mixtures with Al2O3 C molar ratio of 1.3 and 0.5-3 wt% of CaF2, Y2O3, Li2CO3 and/or SrCO3 as additives In relation to the conventional CRN process, the use of multicomponent additive systems reduced the synthesis temper attire in 200 degrees C (CaF2-SrCO3), 100 degrees C (CaF2-Li2CO3 and CaF2-Y2O3-Li2CO3) or < 100 degrees C (CaF2-Y2O3 and CaF2-Y2O3-Li2CO3-SrCO3) X-ray diffraction patterns showed that the additives reacted with the alumina powder forming aluminate phases, which vaporized with the increase of synthesis temperature The enhanced AlN conversion rate was discussed in terms of the vaporization of aluminates in the reducing atmosphere (C) 2010 Elsevier Ltd. All rights reserved

引用

页码：733 / 738

页数：6

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