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Can grey knights use power fist's, power claw's or combi wepons?

They can use thunderhammers with extra rules. They are better than regular T.Hammers and P.Fists. Costing either 10pts/5pts/free depending on the unit they are purchased for. They can insta gibb daemons/psykers. Also with the hammerhand rule applying the +1 str first they usually swing at str10. Combi weapons... no.

Even if they could you have force weapon options and would not want to lose the benefit, unless there was force fists/claws. Though I think servitors can get fists, don't have the codex in front of me to check.