Structural,mechanicalandsuperconductingpropertiesofBi2Sr2Ca1xYxCu2Oy superconductorswith various x values(0.00rxr0.50) areinvestigatedbyX-raydiffraction,scanningelectronmicroscopy, Vickershardnessandresistivitymeasurements.ItisfoundthatthereplacementofCa2þ by Y3þ does not influencethephasepurityofBi:2212whilelatticeparameters,orthorhombicdistortion,surface morphology,oxygencontentandholecarrierperCuion(P)areaffected.Furthermore,thecritical temperatures Tc are increasedbyincreasing Y contentupto0.30,followedbyadecreasewithfurther increaseof Y contentupto0.50.Thevaluesof Tc are 88,94,101,104and501 K for x¼0.00,0.075,0.15, 0.30 and0.50,respectively.Similarbehaviorisobtainedfortheabsolutevaluesoftruehardness Ht and surface energy g against Y contentwhiletheoppositebehaviorisrecordedfortheholecarrierperCu ion (P),deducedfrom Tc values,against Y content.Similarbehaviorisobtainedfortheabsolutevalues of truehardness Ht and surfaceenergy g against Y content.Theseresultsarediscussedintermsof possiblereasonsforsuppressionofsuperconductivityby Y substitutionattheCasiteintheBi:2212 superconductingsystem.