Effects of Si, W and W-Mo on isothermal oxidation behaviors of Nb/Nb5Si3 in situ composites at high temperature

被引：26
作者：
Xiong, Bowen [1 ,2 ]
Cai, Changchun [1 ]
Wan, Hong [2 ]
Zheng, Yuhui [1 ]
机构：
[1] Nanchang Hangkong Univ, Natl Def Key Discipline Lab Light Alloy Proc Sci, Nanchang 330063, Peoples R China
[2] Nanchang Hangkong Univ, Sch Mat Sci & Engn, Nanchang 330063, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2009年 / 486卷 / 1-2期
关键词：
Oxidation behavior; Microstructure; In situ composites; Niobium silicide; High-temperature material; MICROSTRUCTURE; ALLOYS; MOLYBDENUM; RESISTANCE; ADDITIONS; HF;
D O I：
10.1016/j.jallcom.2009.06.136
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The effects of Si, W and W-Mo on the isothermal oxidation behaviors of Nb/Nb5Si3 in situ composites in static air at 1000 and 1200 degrees C for 20-100 h were investigated on as-cast materials. The results show that the oxidation kinetics of each alloy was not changed whether at 1000 or 1200 degrees C, and the oxidation mechanism were not changed. The oxidation resistance of Nb/Nb5Si3 in situ composites was sensitive to Si content, and the oxidation rate of Nb-10Si alloy was more than twice as many that of Nb-20Si alloy. By alloying of W, the oxidation resistance of Nb-20Si-10W alloy was improved significantly, because the WO3 scale can provide the adherence for the creaked Nb2O5 scale and reduce the diffusion of oxygen through the scale. Comparing to alloying with W, the poor oxidation resistance of Nb-20Si-10W-10Mo alloy was attributed to the evaporation of MoO3 and highly porous scale. Crown Copyright (C) 2009 Published by Elsevier B.V. All rights reserved.
引用
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页码：330 / 334
页数：5
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