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

doi:10.11900/0412.1961.2018.00015

Acta Metall Sin

2018, Vol. 54

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

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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

Cite this article:

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. Acta Metall Sin, 2018, 54(12): 1792-1800.

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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

Received: 10 January 2018

ZTFLH:

TG146.4

Fund: Supported by National Natural Science Foundation of China (Nos.51701162 and 51674196), China Postdoctoral Science Foundation (No.2016M602885), Excellent Doctoral Innovation Fund of Xi'an University of Technology (No.310-252071705) and Shaanxi Postdoctoral Scientific Research Project (No.2016-BSHEDZZ07)

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	Bin LI
	Xiaohui LIN
	Rui LI
	Guojun ZHANG
	Laiping LI
	Pingxiang ZHANG

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https://www.ams.org.cn/EN/10.11900/0412.1961.2018.00015 OR https://www.ams.org.cn/EN/Y2018/V54/I12/1792

Fig.1 Isothermal section of the Mo-Si-B alloy at Mo-rich area at 1600 ℃^[18], the three compositions are marked by the solid black spots

Fig.2 XRD spectra of the Mo-Si-B alloys with different B contents

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

Table 1 Volume fractions (f ) of various phases in the Mo-Si-B alloy with different B contents (%)

Fig.3 TEM bright-field images of Mo-12Si-5B alloy (a), Mo-12Si-8.5B alloy (b) and Mo-12Si-17B alloy and corresponding SAED patterns (insets) (c)

Fig.4 Thermal weight loss curves of the Mo-12Si-5B (a), Mo-12Si-8.5B (b) and Mo-12Si-17B(c) alloys

Fig.5 Oxide scale images of the Mo-12Si-5B (a~d), Mo-12Si-8.5B (e~h) and Mo-12Si-17B (i~l) alloys oxidized at 1000 ℃ (a, e, i), 1100 ℃ (b, f, j), 1200 ℃ (c, g, k) and 1300 ℃ (d, h, l)

Fig.6 Cross section SEM image (a), EDS line scanning (b) and XRD spectrum (c) of surface oxidation phase of the Mo-12Si-8.5B alloy oxidized at 1000 ℃ for 10 h (Arrows in Fig.6a indicate MoO₃, MoO₂ or La₂O₃)

Fig.7 Cross section SEM images of oxide scales of the Mo-12Si-8.5B alloy oxidized at 1000 ℃ (a), 1100 ℃ (b) and 1200 ℃ (c) for 10 h

Fig.8 Cross section SEM images of oxides scale of Mo-12Si-8.5B alloy oxidized at 1000 ℃ for 10 h (a) and 30 h (b)

Fig.9 Cross section SEM images of oxide scales of the Mo-12Si-5B (a), Mo-12Si-8.5B (b) and Mo-12Si-17B (c) alloys oxidized at 1200 ℃ for 10 h

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