DOI: 10.14704/nq.2022.20.11.NQ66235

Improvement of mechanical properties of CoCr alloy F75 by zirconium oxide addition

Zain A.K. Alhusseini and Haydar H.J. Jamal Al-Deen

Abstract

The aim of this study is to investigate the influence of zirconia addition as a particles reinforcement with various percentages (0.5,1,1.5,2,2.5,3,3.5,4,4.5,5 wt. %) on mechanical properties of biomedical CoCrMo alloy ASTM(F75) prepared using powder metallurgy technique (P/M). Samples were sintering and preparing for microstructure observation, macro-hardness tests, dry sliding wear test and compressive test. Increasing the values of hardness significantly as zirconia addition increase from (109HB) of base alloy to (151HB) at (5%) adding of ZrO2. The wear rate of CoCrMo alloy (with and without additives) increases as the time and load are increased. the wear resistance an increase significantly with zirconia additive compared with base CoCrMo alloy where the volume loss decrease from (0.002 cm3 of the base) to (0.000671 cm3) at (2.5% ZrO2) as minimum of volume loss which consider the best improvement percentage of wear resistance. The compression resistance was increasing by zirconia addition.

Keywords

Powder metallurgy, wear resistance, ASTM (F75) alloy, Zirconia.

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