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The article researched simulation of the melted metal die forging process of temperature field, velocity field, shrinkage porosity and oxides of femoral stem of CoCrMo alloy and effects of casting temperature, mold temperature and forging speed on the filling and solidification with the help of the software ProCAST. The results indicated molten metal impact ran into the wall of the mold cavity and formed turbulent flow in the neck and head of the femoral stem, which posed risk of gas entrainment. Forging speed has obvious influence on oxides: the higher of forging speed, the lower of oxides contents. The molten alloy ran into the wall of the mold cavity and formed turbulent flow in the neck and head of the femoral stem whose top appeared oxides-rich area. CoCrMo alloy femoral stem whose casting was complete without shrinkage porosity have been gotten by injecting inert gas into the mold cavity before molten alloy pouring and setting the exhaust groove at the front of the femoral stem and exhaust plug at the highest position of the head of femoral stem. [ABSTRACT FROM AUTHOR]

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Copyright of West China Journal of Stomatology is the property of Sichuan University, West China College of Stomatology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Objective: This study aimed to determine the effects of copper content on the corrosion resistance of CoCrMoCu alloy and its in vitro antibacterial performance., Methods: CoCrMoCu specimens with different Cu contents (2%, 3%, 5%, and 7%) were prepared by vacuum melting method. CoCrMo without Cu served as control. The corrosion resistance of the specimens was measured by electrochemistry. The antibacterial effects of the specimens on Staphylococcus aureus and Escherichia coli were analyzed by coating-film method., Results: Compared with CoCrMo without Cu, the addition of 2%-5% Cu to CoCrMo improved the pitting and uniform corrosion of CoCrMo alloy and decreased the corrosion current density. The antibacterial performance of CoCrMoCu alloy increased with increased Cu content. The antibacterial rate of alloy was 99% when Cu content exceeded 5%., Conclusions: Cu addition had a statistically significant influence on the corrosion resistance and antibacterial performance of CoCrMoCu. CoCrMoCu has better corrosion resistance and antibacterial performance when Cu content is 5%.