Microstructure and tribological properties of ZrO2 particles reinforced titanium matrix composites prepared via cold spray-friction composite additive manufacturing
ZrO2 particle reinforced titanium matrix composites were prepared by cold spray additive manufacturing(CSAM)and cold spray-friction composite additive manufacturing(CFAM).The microstructure was characterized by SEM and EBSD,and the tribological properties and tribological mechanism in simulated body fluid(SBF)environment were investigated.The results show that compared with the CSAM sample,the hole defects in CFAM sample disappear and the microstructure is significantly densified.ZrO2 is uniformly distrib-uted in Ti matrix,and the densities of the sample reach 99.1％.Continuous dynamic recrystallization occurs during CFAM and the aver-age grain size is homogenized to 2.5 μm.Compare with the CSAM sample,the CFAM sample shows a significant increase in microhard-ness(from 221 HV0.2 to 544 HV0.2).The CFAM sample has the lower wear rate(1.09× 10-3 mm3·N-1·m-1)and exhibits better wear resistance property in simulated body fluid environment.Abrasive wear and adhesive wear are the main tribological mechanisms of CSAM sample,while abrasive wear is the main tribological mechanism of CFAM sample.
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