Effects of Particle Size and Plasma Sprayed Process on Structure and Bonding Strength of Coating
Ceramic coated Fe3O4 was prepared on T2 pure copper substrate by plasma spraying technology.The effects of different parameters including particle size,plasma atmosphere,carrier gas and spraying power on the phase structure,microstructure,hardness and bonding strength of the coating were investigated.The results show that the phase structure of coating is stabilized with particle size increasing,and the coating prepared in the atmosphere of Ar-N2 plasma has higher density and relatively stable phase structure.The hardness of the particles prepared at large scale first increases and then decreases by spraying powers increasing,the bonding strength increases gradually when the carrier gas is N2,while the bonding strength first increases and then decreases when the carrier gas is O2.Under the same spraying conditions,the hardness of the coating is higher,when O2 is carrier gas.When N2 is carrier gas,the strength of bonding of the coating is higher.For Fe3O4 powders with particle size larger than 50 μm,the coating prepared with O2 as carrier gas in the Ar-N2 plasma has the best comprehensive performance.The density of the coating is adjustable under spraying process.
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