不同B含量Mo-Si-B合金的高温抗氧化性能

doi:10.11900/0412.1961.2018.00015

金属学报

2018, Vol. 54

Issue (12): 1792-1800 DOI: 10.11900/0412.1961.2018.00015

本期目录 | 过刊浏览

不同B含量Mo-Si-B合金的高温抗氧化性能

李斌^1,², 林小辉², 李瑞¹, 张国君¹(

), 李来平², 张平祥²

1 西安理工大学材料科学与工程学院西安 710048
2 西北有色金属研究院西安 710016

High-Temperature Oxidation Resistance of Mo-Si-B Alloys with Different B Contents

Bin LI^1,², Xiaohui LIN², Rui LI¹, Guojun ZHANG¹(

), Laiping LI², Pingxiang ZHANG²

1 School of Materials Science and Engineering, Xi'an University of Technology, Xi'an 710048, China
2 Northwest Institute for Nonferrous Metal Research, Xi'an 710016, China

引用本文:

李斌, 林小辉, 李瑞, 张国君, 李来平, 张平祥. 不同B含量Mo-Si-B合金的高温抗氧化性能[J]. 金属学报, 2018, 54(12): 1792-1800.
Bin LI, Xiaohui LIN, Rui LI, Guojun ZHANG, Laiping LI, Pingxiang ZHANG. High-Temperature Oxidation Resistance of Mo-Si-B Alloys with Different B Contents[J]. Acta Metall Sin, 2018, 54(12): 1792-1800.

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摘要:

测试了不同B含量(5%~17%,原子分数)的Mo-Si-B合金在1000~1300 ℃的抗氧化性能,并对其微观组织及抗氧化机制进行了分析。结果表明,Mo-Si-B合金的氧化行为受B含量和氧化温度共同影响,B元素主要通过改善表面玻璃相流动性和调节合金内α-Mo、Mo₃Si和Mo₅SiB₂三相的体积分数和微观组织来影响氧化膜的形成和生长过程。B含量的增加虽然有助于提升玻璃相在低温下的流动性而促使表面氧化膜快速成形和均匀覆盖,但在高温下氧化膜充足的流动性却不利于合金抗氧化性能的提升。在低温时Mo-Si-B合金的抗氧化性能受控于B含量,而在高温时抗氧化性能取决于α-Mo相含量。对于B含量较高的细晶Mo-12Si-17B合金,由于含有较多的Mo₅SiB₂相和较少的α-Mo相,在1000~1300 ℃整个氧化温度区间内,表面均能形成一层完整、致密的氧化膜。金属间化合物弥散分布的细晶结构可以确保Mo-Si-B合金表现出优异的抗氧化性能。

关键词 ： Mo-Si-B合金, B含量, 微观组织, 抗氧化性能

Abstract：

The oxidation behaviors of the Mo-Si-B alloy with B content in the range of 5% to 17% (atomic fraction) were experimentally investigated at temperatures ranging from 1000 ℃ to 1300 ℃. The microstructures and antioxidant mechanisms were also analyzed. Results showed that the oxidation behaviors were affected by both B content and oxidation temperature. The formation and growth process of oxidation film were mainly influenced by the B element which could improve the fluidity of surface glass phase and adjust the volume fraction and microstructure of α-Mo, Mo₃Si and Mo₅SiB₂. The Mo-Si-B alloy with the B content increasing was favourable for quick forming and uniform covering by improving the mobility of the glass, but which decreased the oxidation resistance due to the sufficient liquidity of the oxidation film at high temperature. The oxidation resistance of the Mo-Si-B alloy is controlled by B content at low temperature and α-Mo content at high temperature, respectively. A large quantity of Mo₅SiB₂ phase and a small quantity of α-Mo phase existed in the high B content of Mo-12Si-17B alloy, which could promote the oxide layer to form rapidly but also cover uniformly under the temperature range of 1000~1300 ℃. The discussion illustrates that the fine-grained microstructure combining with the distributed intermetallics is a specific role to ensure the excellent oxidation resistance of Mo-Si-B alloy.

Key words： Mo-Si-B alloy B content microstructure oxidation resistance

收稿日期: 2018-01-10

ZTFLH:

TG146.4

基金资助:国家自然科学基金项目Nos.51701162、51674196,中国博士后科学基金项目No.2016M602885,西安理工大学优博创新基金项目No.310-252071705和陕西省博士后科研项目No.2016BSHEDZZ07

作者简介:

作者简介李斌,男,1983年生,博士

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https://www.ams.org.cn/CN/10.11900/0412.1961.2018.00015 或 https://www.ams.org.cn/CN/Y2018/V54/I12/1792

图1 1600 ℃下Mo-Si-B合金Mo富集区域等温截面相图[18],3种实验合金的成分选择如图中黑点所示

图2 不同B含量Mo-Si-B合金的XRD谱

Alloy	f_α_-Mo	$f M o 3 Si$	$f M o 5 Si B 2$	$f L a 2 O 3$
Mo-12Si-5B	49.2	32.4	17.1	1.3
Mo-12Si-8.5B	43.7	25.3	29.8	1.2
Mo-12Si-17B	24.2	11.4	63.2	1.2

表1 不同B含量Mo-Si-B合金内各相的体积分数

图3 不同B含量Mo-Si-B 合金的TEM像和SAED花样

图4 不同B含量Mo-Si-B合金的热失重曲线

图5 不同B含量Mo-Si-B合金在不同温度氧化后的宏观照片

图6 Mo-12Si-8.5B合金在1000 ℃氧化10 h后表面氧化膜的横截面形貌、EDS线扫描及XRD谱

图7 不同温度氧化10 h后Mo-12Si-8.5B合金氧化膜截面形貌的SEM像

图8 在1000 ℃下氧化不同时间后Mo-12Si-8.5B合金氧化膜截面形貌的SEM像

图9 1200 ℃氧化10 h后不同B含量Mo-Si-B合金的氧化膜截面形貌的SEM像

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