(1. 中国科学院 金属研究所 沈阳材料科学国家(联合)实验室，沈阳 110016；
2. 英国伦敦大学学院 化学系，伦敦WC1H 0AJ)
摘 要: 采用添加造孔剂的粉末冶金方法制备高强度低模量大块多孔医用Ti-24Nb-4Zr-8Sn(质量分数，%，简称Ti2448)合金。采用扫描电镜(SEM)、压缩试验和弹性模量仪对其形貌特征、力学性能进行研究。结果表明：由于造孔剂PMMA(聚甲基丙烯酸甲酯)具有较好的塑性，在冷轧成形过程中能够保持其原始形状，故可以制备出孔隙特征参数和力学性能均可调的多孔Ti2448合金；随着造孔剂粒径的增加，平均孔径增加，压缩强度和弹性模量减小；随着烧结温度的升高，孔隙率和平均孔径略有减小，压缩强度和弹性模量增加。
关键字: 医用钛合金；多孔Ti-24Nb-4Zr-8Sn合金；造孔剂；弹性模量
fabricated by space-holder method
（1. Shenyang National Laboratory for Materials Science, Institute of Metal Research,
Chinese Academy of Sciences, Shenyang 110016, China;
2. Department of Chemistry, University College London, London WC1H 0AJ, England）
Abstract:Porous biomedical Ti-24Nb-4Zr-8Sn (mass fraction, %, Ti2448) alloy with high strength and low modulus was fabricated by powder metallurgy which was called space-holder method. The porous structures and mechanical properties of the porous alloy were examined by scanning electron microscopy (SEM), compressive tests and instrument of elastic modulus. The results show that the good plasticity of space-holder (PMMA) greatly facilitates the fabrication of porous Ti2448 alloys with adjustable pore characteristics and mechanical properties. The average pore size of porous Ti2448 alloy increases correspondingly with the increase of size of space-holder, but compressive strength and elastic modulus take on the trend of decreasing. The effect of sintering temperature is not obvious to the average pore diameter and porosity, but compressive strength and elastic modulus increase with the rising of sintering temperature.
Key words: biomedical titanium alloys; porous Ti-24Nb-4Zr-8Sn alloy; space-holder; elastic modulus
