Some sort of isolating compound is a very good idea. If the fit between bearing and shell is tight enough grease serves well. If not then anti seize or even Locktite retaining compound are suggested. This fit is hard to determine for the novice so the usual path is to try grease, being the easiest to apply, likely to be on hand and least effort to reverse. Then move onto more involved compounds if the grease doesn't work for long enough. Note I said "for long enough". No solution is forever. Andy (who never put much credence in the "heating up" of a drivetrain as reason to cause issues).