Preparation,microstructure and properties of Ti/ZrO2-Al2O3 gradient materials by laser directed energy deposition
Ti/ZrO2-Al2O3 gradient material was prepared by laser directed energy deposition technology.The microstructure,element distribution and changes of microhardness were systematically analyzed by means of scanning electron microscopy,energy spectrometer and Vickers hardness tester,and the influence of Al2O3 con-tent in ZrO2 ceramic powder on the microstructure and properties of the material was explored.The results show that with the increase of Al2O3 content,the mixing of the two phases is more uniform,while the cracking phenom-enon is more serious at the interface.The hardness of ceramic region in the sample also increases as the Al2O3 content increases.When the Al2O3 content is 30％,the hardness reaches 1344.5HV0.2,but in the binding region,the hardness increases significantly,reaching 1187.3HV0.2,only when the Al2O3 content increases to 30％.
NETL
NSTL
万方数据
