Effects of Spraying Powder on Microstructure of MoSi_2 Coating
MoSi2 coatings were prepared on K403 nickel-base alloy surface by plasma spraying using MoSi2 powder synthesized by self-propagating high-temperature synthesis(SHS) and MoSi2 agglomerated powder as feedstock.The influences of different powders on phase composition and microstructure of MoSi2 coatings were studied.The results show that the MoSi2 coating prepared by the SHS powder contains too many Mo5Si3 and Mo phases,which is not beneficial to its oxidation resistance,however,when MoSi2 aggregate powder as raw material powder,the coating has high compactness and little Mo5Si3 and Mo phases.