STUDY ON THE PREPARATION PROCESS OF T2 ALLOY IN THE Mo-Si-B SYSTEM

doi:10.11900/0412.1961.2015.00053

Acta Metall Sin

2015, Vol. 51

Issue (11): 1377-1383 DOI: 10.11900/0412.1961.2015.00053

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STUDY ON THE PREPARATION PROCESS OF T2 ALLOY IN THE Mo-Si-B SYSTEM

Kunming PAN¹(

),Laiqi ZHANG²,Shizhong WEI¹,Jiwen LI¹,Hao LI³,Junpin LIN²

1 Engineering Research Center of Tribology and Materials Protection, Ministry of Education, Henan University of Science and Technology, Luoyang 471023
2 State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083
3 School of Materials Science and Engineering, Luoyang Institute of Science and Technology, Luoyang 471023

Cite this article:

Kunming PAN,Laiqi ZHANG,Shizhong WEI,Jiwen LI,Hao LI,Junpin LIN. STUDY ON THE PREPARATION PROCESS OF T2 ALLOY IN THE Mo-Si-B SYSTEM. Acta Metall Sin, 2015, 51(11): 1377-1383.

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Abstract

Mo₅SiB₂ (T2) can be used as a promising elevated-temperature structural material because of its high melting temperature (about 2200 ℃), and excellent resistance to oxidation and creep. The Mo₅SiB₂(T2) alloy was prepared by both spark plasma sintering (SPS) and tube furnace sintering (TFS), and then the microstructures were characterized by XRD, SEM-EDS and TEM. The results show that the rapid heating rate is one of important dynamic conditions responsible for the synthesis of T2. Compared with traditional methods, SPS can provide the fast synthesis in a particular way of labilized plasma sintering so that the sample can be heated to the expected temperature of 1500 ℃ with a short period. The melted Si can rapidly react with Mo and B to synthesize T2 in the solid-liquid state prior to the formation of binary phases (Mo₃Si, Mo₅Si₃, MoB, etc.) in the solid state in the range of 600~1200 ℃. The average size of grains is equal to 1.44 μm. The boundaries are clear and have the shape of a straight line without transition zones. Moreover, no defects such as dislocations were found in the T2 alloys prepared by SPS.

Key words: Mo₅SiB₂ (T2) tube furnace sintering (TFS) spark plasma sintering (SPS) microstructure

Fund: Supported by National Natural Science Foundation of China (Nos.50871012 and U1504514), Program for Changjiang Scholars and Innovative Research Team in University (No.IRT1234) and Science & Technology Project of Henan Province (No.20140401)

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	Kunming PAN
	Laiqi ZHANG
	Shizhong WEI
	Jiwen LI
	Hao LI
	Junpin LIN

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https://www.ams.org.cn/EN/10.11900/0412.1961.2015.00053 OR https://www.ams.org.cn/EN/Y2015/V51/I11/1377

Fig.1 XRD spectra of Mo-12.5Si-25B (atomic fraction, %) powders prepared by tube furnace sintering (TFS) at different temperatures for 1 h

Fig.2 XRD spectra of Mo-12.5Si-25B powders prepared by TFS at different temperatures for 2 h

Fig.3 Relative densities of the samples prepared by TFS

Fig.4 SEM images of Mo-12.5Si-25B powders prepared by TFS at 1450 ℃ (a) and 1500 ℃ (b) for 1 h

Fig.5 XRD spectra of the samples produced by spark plasma sintering (SPS) at 1500 ℃ with heating rates of 50, 100, 200 and 300 ℃/min

Fig.6 Relative densities of the samples prepared by SPS with different heating rates and sintering temperatures

Fig.7 XRD spectra of the samples prepared by SPS at different temperatures with heating rate of 200 ℃/min

Fig.8 SEM image of the sample prepared by SPS at 1600 ℃ with heating rate of 200 ℃/min

Fig.9 SEM image of the sample prepared by SPS at 1500 ℃ with heating rate of 200 ℃/min and OM image of the sample etched by oxalic acid (inset) (a), and corresponding gain size distribution curves (b)

Fig.10 Bright field TEM image and SAED patterns (insets) for the sample produced by SPS at 1500 ℃ with heating rate of 200 ℃/min

Fig.11 DSC curve of Mo-12.5Si-25B mixed powder heated up to 1500 ℃ with 10 ℃/min (a) and XRD spectra of products after heating to different temperatures with 10 ℃/min (b)

Fig.12 Shrinkage behavior of the sample during the SPS process

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