Krell, A.A.Krell2022-03-032022-03-031995https://publica.fraunhofer.de/handle/publica/18657010.1111/j.1151-2916.1995.tb08508.xMonolithic alumina bodies with a grain size of 0.5 micrometer and submicron tetragonal ZrO2(3 mol-percent Y2O3) polycrystals were produced and investigated. With decreasing indentation load, the hardness increases but may again decrease below about 5 N; relevant measurements require the application of fairly high loads. Decreasing grain sizes increase the hardness of alumina and zirconia ceramics even for very small grain sizes in the submicron range .enAl2O3grain sizehardnessHärteKorngrößePrüflastsintered aluminaSinterkorundtesting loadtetragonal ZrO2 polycrystaltetragonal ZrO2-Polykristall666620journal article