['Nevertheless', ',', 'these', 'results', 'from', 'the', 'wear', '-', 'mode', 'maps', 'indicated', 'that', 'the', 'wear', 'mode', 'of', 'RH', 'ceramics', 'was', 'powder', 'formation', 'accompanied', 'with', 'microcracks', 'under', 'all', 'tested', 'conditions', 'in', 'this', 'study', ',', 'resulting', 'in', 'low', 'wear', '(', '<', '5×10−9mm2', '/', 'N', ')', '.']