State Key Laboratory for Advanced Metals And Materials, University of Science and Technology Beijing, Beijing 100083
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DOI:
10.7502/j.issn.1674-3962.2015.02.04
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Abstract:
Following the Ni-base superalloy as well as a second-generation high-temperature TiAl alloy, MoSi2 is the third-generation ultra-high-temperature structural material which possesses a high melting point, low density and excellent oxidation resistance at elevated temperature. Unfortunately, up to now the low temperature brittleness, insufficient high-temperature strength, especially creep strength and poor oxidation resistance at about 400-600℃ limit its application in industry. The research development of MoSi2-based composites reinforced with carbides, carbon nano-tube, borides, oxides, nitrides, and synergistic complex phases was summarized. Also, the state- of- art of the alloying of MoSi2 with Al, Re, Al-Re, Nb, W, Mg, and so on was reviewed. In addition, the research development o-f the low temperature oxidation of MoSi2 (Pest) was summarized. At the end, it was pointed out that synergistic complex phase reinforcement is helpful to improve the balanced mechanical properties of MoSi2. With respect of compositing and alloying, synergy of compositing and alloying, and "small multiple" should be the future directions of development to improve the balanced properties of MoSi2.