定向结晶对多孔股骨柄室温拉伸性能的影响

Effects of Directional Solidification on Tensile Property of Femoral Stem with Porous Surface

采用医用钴铬钼合金,通过普通铸造和定向结晶铸造两种技术制得多孔股骨柄毛坯,经高温烧结制成多孔股骨柄。对比研究了普通铸造技术和定向结晶对多孔股骨柄的室温拉伸性能的影响,分析了两种股骨柄的宏观与显微组织以及断口形貌。结果表明:经高温烧结的定向结晶铸造股骨柄,其宏观组织呈柱状晶,室温拉伸性能比高温烧结的普通铸造股骨柄显著提高,抗拉强度和延伸率分别至少提高了1.2倍和2倍。

Femoral stems with porous surface of hip joint prostheses were manufactured using biomedical Co-Cr-Mo alloys by usual casting and directional solidification casting, followed by sintering at high temperatures. Effects of two different casting processes on mechanical properties of femoral stems were studied. Macro-and micro-structure and fracture appearance were compared. The results indicate that for femoral stems manufactured by directional solidification followed by sintering, column crystals are observed and the tensile strength at room temperature increased greatly by the technology. The tensile strength and elongation of femoral stems with porous surface increased to 1.2 and 2.0 times, respectively.