医用近β型钛合金TLM的碱液处理与生物活性

Alkali Treatment and Bioactivity of Medical Near β-Type Titanium Alloy TLM

摘要:

采用模拟体液浸泡法评价碱液处理TLM (Ti-25Nb-3Zr-2Sn-3Mo)合金的生物活性。钛合金TLM经过碱液处理后表面生成了钛(铌)酸钠凝胶层，凝胶层厚度随碱液浓度升高而增加。在模拟体液中浸泡43 h后，碱液处理钛表面只有少量磷灰石晶核生成，而碱液处理TLM合金表面有五水磷酸八钙晶粒形成，磷灰石的形核也较多。钛合金TLM在碱液处理时生成的钛(铌)酸钠凝胶层厚于纯钛，而较厚的凝胶层使其生物活性提高

Abstract:

The bioactivity of alkali treated TLM (Ti-25Nb-3Zr-2Sn-3Mo) alloy was evaluated by the simulated body fluid (SBF) soaking method. Sodium titanate (niobate) gel layer was formed on the TLM alloy after alkali treatment, and the gel layer thickness was increased with higher alkali concentration. After soaking in SBF for 43 h, only a small quantity of apatite nucleus were formed on alkali treated pure titanium, while Ca8H2(PO4)6·5H2O crystals were detected and there were more apatite nucleus on the alkali treated TLM alloy. Results show that the alkali treated TLM alloy has thicker sodium titanate (niobate) gel layer and consequently possesses higher bioactivity than the alkali treated pure titanium.