Preparation of Spraying Powders and Microstructureof MolybdenumDisilicide Coating

doi:10.3724/SP.J.1077.2011.00203

Abstract

Abstract: With the size of 1-2μm MoSi₂powder as raw material, MoSi₂ powderideal for air plasma spraying was prepared by spray drying and vacuumsintering. By using MoSi₂ powders (9.68μm ) and agglomeration powders (38-72μm) as the spray feedstock, MoSi₂ coatings weresuccessfully prepared using air plasma spraying. The phase composition and microstructure of the coatingwere studied.The results show that the mobility and loosedensity of theagglomeration powders sintered at 1300℃ for 1h are 17.1s/50g and 2.1g/cm³, respectively. Compared with the unsintered powders, the mobility and loose density of the sintered agglomeration powders increaseby 57.0% and 46%, respectively. XRD patterns shows the main phasesare Mo and Mo₅Si₃ phases in the coating prepared by thepowders with the size of 9.68 μm.In case of spraying withagglomeration powders, the main phase of the dense coating is MoSi₂. The “mesh”microstructure of molybdenum-rich phase is produced in the coatingprepared by the agglomeration powders.

Key words: molybdenum disilicide, spraying drying, air plasma spray, coating

CLC Number:

TB35

YAN Jian-Hui, TANG Si-Wen, ZHANGHou-An. Preparation of Spraying Powders and Microstructureof MolybdenumDisilicide Coating[J]. Journal of Inorganic Materials, 2011, 26(2): 203-208.

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