Oxidation kinetics of magnesium aluminum oxynitride-boron nitride   (MgAlON-BN) composites

doi:10.2109/jcersj2.122.829

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	Oxidation kinetics of magnesium aluminum oxynitride-boron nitride (MgAlON-BN) composites
	Li, Jinfu ; Sun, Yongqi ; Seetharaman, Seshadri ; Zhang, Zuotai
刊名	journal of the ceramic society of japan
	2014
关键词	Magnesium aluminum oxynitride Boron nitride Thermogravimetry Oxidation Activation energy CERAMICS BEHAVIOR MODEL ALON
DOI	10.2109/jcersj2.122.829
英文摘要	The oxidation behaviour of MgAlON-BN composite was investigated under the air atmosphere using thermogravimetry (TG), scanning electron microscopy (SEM) and X-ray diffraction (XRD) techniques in the present articles. Non-isothermal experimental results indicated that the rate of oxidation can be neglected at low temperature and, with further increasing temperatures, an increase of the oxidation was observed. While BN addition promoted the oxidation above 1100 K, and the weight gain was observed to decrease due to the fast evaporation of boron oxide as the temperature was beyond 1580 K. Isothermal studies also clearly indicated the decrease of weight gain due to evaporation after a certain oxidation time. The oxidation mechanism was investigated, and the results showed the oxidation products were gamma-Al2O3 at low temperature and transformed to alpha-Al2O3 as the temperature was above 1100 degrees C. BN addition promoted the transformation from gamma-Al2O3 to alpha-Al2O3. From the isothermal oxidations, the kinetics of oxidation and evaporation were evaluated, and the overall kinetics of oxidation and evaporation were studied, and the activation energy for evaporation of B2O3 and for the oxidation of MgAlON-15 vol% BN at the later stage are 115.4 and 196.1 kJ/mol, respectively. The present paper provides a way to deal with oxidation of composites containing evaporating component. (C) 2014 The Ceramic Society of Japan. All rights reserved.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000342066500016&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; Materials Science, Ceramics; SCI(E); EI; 0; ARTICLE; zuotaizhang@pku.edu.cn; 1429; 829-834; 122
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/315764]
专题	工学院
推荐引用方式 GB/T 7714	Li, Jinfu,Sun, Yongqi,Seetharaman, Seshadri,et al. Oxidation kinetics of magnesium aluminum oxynitride-boron nitride (MgAlON-BN) composites[J]. journal of the ceramic society of japan,2014.
APA	Li, Jinfu,Sun, Yongqi,Seetharaman, Seshadri,&Zhang, Zuotai.(2014).Oxidation kinetics of magnesium aluminum oxynitride-boron nitride (MgAlON-BN) composites.journal of the ceramic society of japan.
MLA	Li, Jinfu,et al."Oxidation kinetics of magnesium aluminum oxynitride-boron nitride (MgAlON-BN) composites".journal of the ceramic society of japan (2014).