Different particle sizes of ruthenium powder are added to prepare hard alloys.The properties of hard al-loys with different particle sizes of ruthenium powder and the solid solution of ruthenium in cobalt are compared and stud-ied using optical metallographic microscopy,rockwell hardness tester,bending strength tester,scanning electron microsco-py,and energy spectrum analysis.The results show that as the particle size of ruthenium powder is decreased,the bending strength,rockwell hardness and fracture toughness of the alloy all are increased,and the finer the ruthenium powder is,the more significant the improvement is.As the particle size of ruthenium powder is decreased,ruthenium β of the solid solu-tion content in the phase is increased significantly.There is no significant difference in the microstructure of the hard alloy prepared by adding ruthenium powder with different particle sizes,and the metallographic phase is uniform without any ab-normalities.
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