Formability and mechanical properties of porous titanium produced by a moldless process.
Formability and mechanical properties of porous titanium produced by a moldless process.
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DOI：
10.1002/jbm.b.32919
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发表时间：
2013-08
期刊：
影响因子：
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通讯作者：
Yoshihito Naito;Jiyoung Bae;Y. Tomotake;K. Hamada;K. Asaoka;T. Ichikawa
中科院分区：
文献类型：
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作者：
Yoshihito Naito;Jiyoung Bae;Y. Tomotake;K. Hamada;K. Asaoka;T. Ichikawa
定制的多孔钛植入物在骨科和牙科应用中显示出巨大的前景。然而，传统的粉末冶金工艺需要高成本的模具，这使得它们在生产独特的设备时在经济上不可行。在这项研究中，开发了钛粉和镶嵌蜡粘合剂的混合物，用于无模成型和烧结。评价了混合物的成形性、烧结后的尺寸变化以及烧结多孔钛的物理机械性能。在 70°C 下手动制备钛粉和蜡粘合剂的 90:10 wt% 混合物。脱脂后，在没有任何模具的情况下，将样品在 Ar 中于 1100°C 下烧结 1、5 和 10 小时。测量收缩率、孔隙率、吸收率、弯曲和压缩强度以及弹性模量。弯曲强度（135-356 MPa）、压缩强度（178-1226 MPa）和弹性模量（24-54 GPa）随着烧结时间的延长而增加；收缩率也增加，而孔隙率（从 37.1% 增加到 29.7%）和吸收率下降。粘合剂/金属粉末混合物的高成型性对于制造定制的骨和硬组织替代单元具有明显的优势。此外，烧结体表现出高强度和与皮质骨相当的弹性模量。
Tailor-made porous titanium implants show great promise in both orthopedic and dental applications. However, traditional powder metallurgical processes require a high-cost mold, making them economically unviable for producing unique devices. In this study, a mixture of titanium powder and an inlay wax binder was developed for moldless forming and sintering. The formability of the mixture, the dimensional changes after sintering, and the physical and mechanical properties of the sintered porous titanium were evaluated. A 90:10 wt % mixture of Ti powder and wax binder was created manually at 70°C. After debindering, the specimen was sintered in Ar at 1100°C without any mold for 1, 5, and 10 h. The shrinkage, porosity, absorption ratio, bending and compressive strength, and elastic modulus were measured. The bending strength (135-356 MPa), compression strength (178-1226 MPa), and elastic modulus (24-54 GPa) increased with sintering time; the shrinkage also increased, whereas the porosity (from 37.1 to 29.7%) and absorption ratio decreased. The high formability of the binder/metal powder mixture presents a clear advantage for fabricating tailor-made bone and hard tissue substitution units. Moreover, the sintered compacts showed high strength and an elastic modulus comparable to that of cortical bone.