Abstract
To regulate the microstructure and properties of the composite coating prepared by plasma spraying MoO3-Al composite powder, the microstructure evolution of plasma sprayed MoO3-Al composite powder was analyzed based on water quenching test. The reaction path of MoO3-Al was investigated by thermodynamic calculation and thermal analysis, and reaction and growth mechanisms of the MoO3-Al composite powder during plasma spraying were revealed. The results show that the reaction of MoO3-Al in the plasma jet results in formation of main phases Mo and Al2O3. Due to the phase separation structure characteristic resulted from gravity segregation, the Mo phase grew into submicron cellular particles and the Al2O3 phase grew into a dense structure during the solidification process. Mo4O11 and Al2(MoO4)3 are important intermediate products in the reaction between MoO3 and Al.
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