Oxidation mechanisms in Mo-reinforced Mo5SiB2(T2)-Mo3Si alloys

被引：215

作者：

Parthasarathy, TA ^{[1
]}

Mendiratta, MG ^{[1
]}

Dimiduk, DM ^{[1
]}

机构：

[1] USAF, Res Lab, MLLM, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA

来源：

ACTA MATERIALIA | 2002年 / 50卷 / 07期

关键词：

oxidation; Mo-reinforced Mo5SiB2 (T2)-Mo-3 Si alloy; boron; silicon; mechanism;

D O I：

10.1016/S1359-6454(02)00039-3

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Results of a systematic investigation of the oxidation in a Mo-Si-B alloy containing the three phases, Mo, Mo3Si, and Mo5SiB2, (T2) are presented. The relative kinetics of B-containing silica-scale formation, permeation of MoO3, through the viscous scale, the viscosity of the B-containing SiQ(2) scale, volatilization of MoO3 and B2O3 from the silica scale, are identified as key parameters that determine the kinetics of the oxidation of the alloy in the temperature range of 500-1300 degreesC. The oxidation is worst in the intermediate temperature range, 650-750 degreesC, where MoO3 begins to volatilize but B2O3 does not, resulting in gaseous MoO3 bubbling through a low viscosity borosilicate scale. In this temperature range, the scale provides insufficient protection suggesting that attempts to improve the oxidation resistance of this system must focus on this temperature range. (C) 2002 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.

引用

页码：1857 / 1868

页数：12

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