Microstructure and oxidation resistance behavior of lanthanum oxide-doped Mo-12Si-8.5B Alloys

Zhang Guo-Jun; Kou Hao; Dang Qian; Liu Gang; Sun Jun

doi:10.1016/j.ijrmhm.2011.06.003

Microstructure and oxidation resistance behavior of lanthanum oxide-doped Mo-12Si-8.5B Alloys

Zhang Guo-Jun
, Kou Hao
, Dang Qian
, Liu Gang
, Sun Jun

School of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

18 Scopus citations

Abstract

Mo-12Si-8.5B (at.%) alloys doped with different mass fraction of lanthanum oxide (La₂O₃) were fabricated by using arc-melting and spark plasma sintering techniques. Composition and microstructures of the samples were examined with XRD and optical microscope, respectively. Oxidation resistance behavior of the alloys at 800 °C and 1000 °C was investigated using TGA, XRD and SEM-EDS. Experimental results show that the Mo-12Si-8.5B alloys are mainly composed of α-Mo, Mo₅SiB₂ (T ₂) and Mo₃Si phases and the grain sizes of alloys doped with La₂O₃ were finer than the undoped ones. At 800 °C and 1000 °C, the alloys doped with La₂O₃ have good oxidation resistances because the protective borosilicate scale is quickly formed and adhered with the substrate. The oxide scales consist of outer boronsilicate glass scale and inner reaction zone consists of molybdenum dioxide. The oxidation mechanisms of the La₂O₃-doped Mo-12Si-8.5B alloys were also discussed in light of the experiments results.

Original language	English
Pages (from-to)	6-11
Number of pages	6
Journal	International Journal of Refractory Metals and Hard Materials
Volume	30
Issue number	1
DOIs	https://doi.org/10.1016/j.ijrmhm.2011.06.003
State	Published - Jan 2012

Keywords

Microstructure
Mo-Si-B alloys
Oxidation behavior

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10.1016/j.ijrmhm.2011.06.003

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title = "Microstructure and oxidation resistance behavior of lanthanum oxide-doped Mo-12Si-8.5B Alloys",

abstract = "Mo-12Si-8.5B (at.\%) alloys doped with different mass fraction of lanthanum oxide (La2O3) were fabricated by using arc-melting and spark plasma sintering techniques. Composition and microstructures of the samples were examined with XRD and optical microscope, respectively. Oxidation resistance behavior of the alloys at 800 °C and 1000 °C was investigated using TGA, XRD and SEM-EDS. Experimental results show that the Mo-12Si-8.5B alloys are mainly composed of α-Mo, Mo5SiB2 (T 2) and Mo3Si phases and the grain sizes of alloys doped with La2O3 were finer than the undoped ones. At 800 °C and 1000 °C, the alloys doped with La2O3 have good oxidation resistances because the protective borosilicate scale is quickly formed and adhered with the substrate. The oxide scales consist of outer boronsilicate glass scale and inner reaction zone consists of molybdenum dioxide. The oxidation mechanisms of the La2O3-doped Mo-12Si-8.5B alloys were also discussed in light of the experiments results.",

keywords = "Microstructure, Mo-Si-B alloys, Oxidation behavior",

author = "Zhang Guo-Jun and Kou Hao and Dang Qian and Liu Gang and Sun Jun",

year = "2012",

month = jan,

doi = "10.1016/j.ijrmhm.2011.06.003",

language = "英语",

volume = "30",

pages = "6--11",

journal = "International Journal of Refractory Metals and Hard Materials",

issn = "0263-4368",

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number = "1",

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TY - JOUR

T1 - Microstructure and oxidation resistance behavior of lanthanum oxide-doped Mo-12Si-8.5B Alloys

AU - Guo-Jun, Zhang

AU - Hao, Kou

AU - Qian, Dang

AU - Gang, Liu

AU - Jun, Sun

PY - 2012/1

Y1 - 2012/1

N2 - Mo-12Si-8.5B (at.%) alloys doped with different mass fraction of lanthanum oxide (La2O3) were fabricated by using arc-melting and spark plasma sintering techniques. Composition and microstructures of the samples were examined with XRD and optical microscope, respectively. Oxidation resistance behavior of the alloys at 800 °C and 1000 °C was investigated using TGA, XRD and SEM-EDS. Experimental results show that the Mo-12Si-8.5B alloys are mainly composed of α-Mo, Mo5SiB2 (T 2) and Mo3Si phases and the grain sizes of alloys doped with La2O3 were finer than the undoped ones. At 800 °C and 1000 °C, the alloys doped with La2O3 have good oxidation resistances because the protective borosilicate scale is quickly formed and adhered with the substrate. The oxide scales consist of outer boronsilicate glass scale and inner reaction zone consists of molybdenum dioxide. The oxidation mechanisms of the La2O3-doped Mo-12Si-8.5B alloys were also discussed in light of the experiments results.

AB - Mo-12Si-8.5B (at.%) alloys doped with different mass fraction of lanthanum oxide (La2O3) were fabricated by using arc-melting and spark plasma sintering techniques. Composition and microstructures of the samples were examined with XRD and optical microscope, respectively. Oxidation resistance behavior of the alloys at 800 °C and 1000 °C was investigated using TGA, XRD and SEM-EDS. Experimental results show that the Mo-12Si-8.5B alloys are mainly composed of α-Mo, Mo5SiB2 (T 2) and Mo3Si phases and the grain sizes of alloys doped with La2O3 were finer than the undoped ones. At 800 °C and 1000 °C, the alloys doped with La2O3 have good oxidation resistances because the protective borosilicate scale is quickly formed and adhered with the substrate. The oxide scales consist of outer boronsilicate glass scale and inner reaction zone consists of molybdenum dioxide. The oxidation mechanisms of the La2O3-doped Mo-12Si-8.5B alloys were also discussed in light of the experiments results.

KW - Microstructure

KW - Mo-Si-B alloys

KW - Oxidation behavior

UR - https://www.scopus.com/pages/publications/80053955266

U2 - 10.1016/j.ijrmhm.2011.06.003

DO - 10.1016/j.ijrmhm.2011.06.003

M3 - 文章

AN - SCOPUS:80053955266

SN - 0263-4368

VL - 30

SP - 6

EP - 11

JO - International Journal of Refractory Metals and Hard Materials

JF - International Journal of Refractory Metals and Hard Materials

IS - 1

ER -

Microstructure and oxidation resistance behavior of lanthanum oxide-doped Mo-12Si-8.5B Alloys

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Keywords

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